Add m-esr52 at 52.6.0

40 files changed, 12157 insertions, 0 deletions

diff --git a/security/nss/gtests/ssl_gtest/Makefile b/security/nss/gtests/ssl_gtest/Makefile
new file mode 100644
index 0000000000..dfb8df9438
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/Makefile
@@ -0,0 +1,59 @@
+#! gmake
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#######################################################################
+# (1) Include initial platform-independent assignments (MANDATORY).   #
+#######################################################################
+
+include manifest.mn
+
+#######################################################################
+# (2) Include "global" configuration information. (OPTIONAL)          #
+#######################################################################
+
+include $(CORE_DEPTH)/coreconf/config.mk
+
+#######################################################################
+# (3) Include "component" configuration information. (OPTIONAL)       #
+#######################################################################
+
+
+#######################################################################
+# (4) Include "local" platform-dependent assignments (OPTIONAL).      #
+#######################################################################
+
+include ../common/gtest.mk
+
+CFLAGS += -I$(CORE_DEPTH)/lib/ssl
+
+ifdef NSS_SSL_ENABLE_ZLIB
+include $(CORE_DEPTH)/coreconf/zlib.mk
+endif
+
+ifndef NSS_ENABLE_TLS_1_3
+NSS_DISABLE_TLS_1_3=1
+endif
+
+ifdef NSS_DISABLE_TLS_1_3
+# Run parameterized tests only, for which we can easily exclude TLS 1.3
+CPPSRCS := $(filter-out $(shell grep -l '^TEST_F' $(CPPSRCS)), $(CPPSRCS))
+CFLAGS += -DNSS_DISABLE_TLS_1_3
+endif
+
+#######################################################################
+# (5) Execute "global" rules. (OPTIONAL)                              #
+#######################################################################
+
+include $(CORE_DEPTH)/coreconf/rules.mk
+
+#######################################################################
+# (6) Execute "component" rules. (OPTIONAL)                           #
+#######################################################################
+
+
+#######################################################################
+# (7) Execute "local" rules. (OPTIONAL).                              #
+#######################################################################
diff --git a/security/nss/gtests/ssl_gtest/databuffer.h b/security/nss/gtests/ssl_gtest/databuffer.h
new file mode 100644
index 0000000000..e7236d4e9a
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/databuffer.h
@@ -0,0 +1,191 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef databuffer_h__
+#define databuffer_h__
+
+#include <algorithm>
+#include <cassert>
+#include <cstring>
+#include <iomanip>
+#include <iostream>
+#if defined(WIN32) || defined(WIN64)
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+extern bool g_ssl_gtest_verbose;
+
+namespace nss_test {
+
+class DataBuffer {
+ public:
+  DataBuffer() : data_(nullptr), len_(0) {}
+  DataBuffer(const uint8_t* data, size_t len) : data_(nullptr), len_(0) {
+    Assign(data, len);
+  }
+  DataBuffer(const DataBuffer& other) : data_(nullptr), len_(0) {
+    Assign(other);
+  }
+  ~DataBuffer() { delete[] data_; }
+
+  DataBuffer& operator=(const DataBuffer& other) {
+    if (&other != this) {
+      Assign(other);
+    }
+    return *this;
+  }
+
+  void Allocate(size_t len) {
+    delete[] data_;
+    data_ = new uint8_t[len ? len : 1];  // Don't depend on new [0].
+    len_ = len;
+  }
+
+  void Truncate(size_t len) { len_ = std::min(len_, len); }
+
+  void Assign(const DataBuffer& other) { Assign(other.data(), other.len()); }
+
+  void Assign(const uint8_t* data, size_t len) {
+    if (data) {
+      Allocate(len);
+      memcpy(static_cast<void*>(data_), static_cast<const void*>(data), len);
+    } else {
+      assert(len == 0);
+      data_ = nullptr;
+      len_ = 0;
+    }
+  }
+
+  // Write will do a new allocation and expand the size of the buffer if needed.
+  // Returns the offset of the end of the write.
+  size_t Write(size_t index, const uint8_t* val, size_t count) {
+    assert(val);
+    if (index + count > len_) {
+      size_t newlen = index + count;
+      uint8_t* tmp = new uint8_t[newlen];  // Always > 0.
+      if (data_) {
+        memcpy(static_cast<void*>(tmp), static_cast<const void*>(data_), len_);
+      }
+      if (index > len_) {
+        memset(static_cast<void*>(tmp + len_), 0, index - len_);
+      }
+      delete[] data_;
+      data_ = tmp;
+      len_ = newlen;
+    }
+    if (data_) {
+      memcpy(static_cast<void*>(data_ + index), static_cast<const void*>(val),
+             count);
+    }
+    return index + count;
+  }
+
+  size_t Write(size_t index, const DataBuffer& buf) {
+    return Write(index, buf.data(), buf.len());
+  }
+
+  // Write an integer, also performing host-to-network order conversion.
+  // Returns the offset of the end of the write.
+  size_t Write(size_t index, uint32_t val, size_t count) {
+    assert(count <= sizeof(uint32_t));
+    uint32_t nvalue = htonl(val);
+    auto* addr = reinterpret_cast<const uint8_t*>(&nvalue);
+    return Write(index, addr + sizeof(uint32_t) - count, count);
+  }
+
+  // This can't use the same trick as Write(), since we might be reading from a
+  // smaller data source.
+  bool Read(size_t index, size_t count, uint32_t* val) const {
+    assert(count < sizeof(uint32_t));
+    assert(val);
+    if ((index > len()) || (count > (len() - index))) {
+      return false;
+    }
+    *val = 0;
+    for (size_t i = 0; i < count; ++i) {
+      *val = (*val << 8) | data()[index + i];
+    }
+    return true;
+  }
+
+  // Starting at |index|, remove |remove| bytes and replace them with the
+  // contents of |buf|.
+  void Splice(const DataBuffer& buf, size_t index, size_t remove = 0) {
+    Splice(buf.data(), buf.len(), index, remove);
+  }
+
+  void Splice(const uint8_t* ins, size_t ins_len, size_t index,
+              size_t remove = 0) {
+    assert(ins);
+    uint8_t* old_value = data_;
+    size_t old_len = len_;
+
+    // The amount of stuff remaining from the tail of the old.
+    size_t tail_len = old_len - std::min(old_len, index + remove);
+    // The new length: the head of the old, the new, and the tail of the old.
+    len_ = index + ins_len + tail_len;
+    data_ = new uint8_t[len_ ? len_ : 1];
+
+    // The head of the old.
+    if (old_value) {
+      Write(0, old_value, std::min(old_len, index));
+    }
+    // Maybe a gap.
+    if (old_value && index > old_len) {
+      memset(old_value + index, 0, index - old_len);
+    }
+    // The new.
+    Write(index, ins, ins_len);
+    // The tail of the old.
+    if (tail_len > 0) {
+      Write(index + ins_len, old_value + index + remove, tail_len);
+    }
+
+    delete[] old_value;
+  }
+
+  void Append(const DataBuffer& buf) { Splice(buf, len_); }
+
+  const uint8_t* data() const { return data_; }
+  uint8_t* data() { return data_; }
+  size_t len() const { return len_; }
+  bool empty() const { return len_ == 0; }
+
+ private:
+  uint8_t* data_;
+  size_t len_;
+};
+
+static const size_t kMaxBufferPrint = 32;
+
+inline std::ostream& operator<<(std::ostream& stream, const DataBuffer& buf) {
+  stream << "[" << buf.len() << "] ";
+  for (size_t i = 0; i < buf.len(); ++i) {
+    if (!g_ssl_gtest_verbose && i >= kMaxBufferPrint) {
+      stream << "...";
+      break;
+    }
+    stream << std::hex << std::setfill('0') << std::setw(2)
+           << static_cast<unsigned>(buf.data()[i]);
+  }
+  stream << std::dec;
+  return stream;
+}
+
+inline bool operator==(const DataBuffer& a, const DataBuffer& b) {
+  return (a.empty() && b.empty()) ||
+         (a.len() == b.len() && 0 == memcmp(a.data(), b.data(), a.len()));
+}
+
+inline bool operator!=(const DataBuffer& a, const DataBuffer& b) {
+  return !(a == b);
+}
+
+}  // namespace nss_test
+
+#endif
diff --git a/security/nss/gtests/ssl_gtest/gtest_utils.h b/security/nss/gtests/ssl_gtest/gtest_utils.h
new file mode 100644
index 0000000000..3ecd96cbe0
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/gtest_utils.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef gtest_utils_h__
+#define gtest_utils_h__
+
+#define GTEST_HAS_RTTI 0
+#include "gtest/gtest.h"
+#include "test_io.h"
+
+namespace nss_test {
+
+// Gtest utilities
+class Timeout : public PollTarget {
+ public:
+  Timeout(int32_t timer_ms) : handle_(nullptr) {
+    Poller::Instance()->SetTimer(timer_ms, this, &Timeout::ExpiredCallback,
+                                 &handle_);
+  }
+  ~Timeout() {
+    if (handle_) {
+      handle_->Cancel();
+    }
+  }
+
+  static void ExpiredCallback(PollTarget* target, Event event) {
+    Timeout* timeout = static_cast<Timeout*>(target);
+    timeout->handle_ = nullptr;
+  }
+
+  bool timed_out() const { return !handle_; }
+
+ private:
+  Poller::Timer* handle_;
+};
+
+}  // namespace nss_test
+
+#define WAIT_(expression, timeout) \
+  do {                             \
+    Timeout tm(timeout);           \
+    while (!(expression)) {        \
+      Poller::Instance()->Poll();  \
+      if (tm.timed_out()) break;   \
+    }                              \
+  } while (0)
+
+#define ASSERT_TRUE_WAIT(expression, timeout) \
+  do {                                        \
+    WAIT_(expression, timeout);               \
+    ASSERT_TRUE(expression);                  \
+  } while (0)
+
+#endif
diff --git a/security/nss/gtests/ssl_gtest/libssl_internals.c b/security/nss/gtests/ssl_gtest/libssl_internals.c
new file mode 100644
index 0000000000..5136ee8ec0
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/libssl_internals.c
@@ -0,0 +1,340 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* This file contains functions for frobbing the internals of libssl */
+#include "libssl_internals.h"
+
+#include "nss.h"
+#include "pk11pub.h"
+#include "seccomon.h"
+#include "ssl.h"
+#include "sslimpl.h"
+
+SECStatus SSLInt_IncrementClientHandshakeVersion(PRFileDesc *fd) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+
+  ++ss->clientHelloVersion;
+
+  return SECSuccess;
+}
+
+/* Use this function to update the ClientRandom of a client's handshake state
+ * after replacing its ClientHello message. We for example need to do this
+ * when replacing an SSLv3 ClientHello with its SSLv2 equivalent. */
+SECStatus SSLInt_UpdateSSLv2ClientRandom(PRFileDesc *fd, uint8_t *rnd,
+                                         size_t rnd_len, uint8_t *msg,
+                                         size_t msg_len) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+
+  SECStatus rv = ssl3_InitState(ss);
+  if (rv != SECSuccess) {
+    return rv;
+  }
+
+  rv = ssl3_RestartHandshakeHashes(ss);
+  if (rv != SECSuccess) {
+    return rv;
+  }
+
+  // Ensure we don't overrun hs.client_random.
+  rnd_len = PR_MIN(SSL3_RANDOM_LENGTH, rnd_len);
+
+  // Zero the client_random struct.
+  PORT_Memset(&ss->ssl3.hs.client_random, 0, SSL3_RANDOM_LENGTH);
+
+  // Copy over the challenge bytes.
+  size_t offset = SSL3_RANDOM_LENGTH - rnd_len;
+  PORT_Memcpy(&ss->ssl3.hs.client_random.rand[offset], rnd, rnd_len);
+
+  // Rehash the SSLv2 client hello message.
+  return ssl3_UpdateHandshakeHashes(ss, msg, msg_len);
+}
+
+PRBool SSLInt_ExtensionNegotiated(PRFileDesc *fd, PRUint16 ext) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  return (PRBool)(ss && ssl3_ExtensionNegotiated(ss, ext));
+}
+
+void SSLInt_ClearSessionTicketKey() {
+  ssl3_SessionTicketShutdown(NULL, NULL);
+  NSS_UnregisterShutdown(ssl3_SessionTicketShutdown, NULL);
+}
+
+SECStatus SSLInt_SetMTU(PRFileDesc *fd, PRUint16 mtu) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (ss) {
+    ss->ssl3.mtu = mtu;
+    return SECSuccess;
+  }
+  return SECFailure;
+}
+
+PRInt32 SSLInt_CountTls13CipherSpecs(PRFileDesc *fd) {
+  PRCList *cur_p;
+  PRInt32 ct = 0;
+
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return -1;
+  }
+
+  for (cur_p = PR_NEXT_LINK(&ss->ssl3.hs.cipherSpecs);
+       cur_p != &ss->ssl3.hs.cipherSpecs; cur_p = PR_NEXT_LINK(cur_p)) {
+    ++ct;
+  }
+  return ct;
+}
+
+void SSLInt_PrintTls13CipherSpecs(PRFileDesc *fd) {
+  PRCList *cur_p;
+
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return;
+  }
+
+  fprintf(stderr, "Cipher specs\n");
+  for (cur_p = PR_NEXT_LINK(&ss->ssl3.hs.cipherSpecs);
+       cur_p != &ss->ssl3.hs.cipherSpecs; cur_p = PR_NEXT_LINK(cur_p)) {
+    ssl3CipherSpec *spec = (ssl3CipherSpec *)cur_p;
+    fprintf(stderr, "  %s\n", spec->phase);
+  }
+}
+
+/* Force a timer expiry by backdating when the timer was started.
+ * We could set the remaining time to 0 but then backoff would not
+ * work properly if we decide to test it. */
+void SSLInt_ForceTimerExpiry(PRFileDesc *fd) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return;
+  }
+
+  if (!ss->ssl3.hs.rtTimerCb) return;
+
+  ss->ssl3.hs.rtTimerStarted =
+      PR_IntervalNow() - PR_MillisecondsToInterval(ss->ssl3.hs.rtTimeoutMs + 1);
+}
+
+#define CHECK_SECRET(secret)                  \
+  if (ss->ssl3.hs.secret) {                   \
+    fprintf(stderr, "%s != NULL\n", #secret); \
+    return PR_FALSE;                          \
+  }
+
+PRBool SSLInt_CheckSecretsDestroyed(PRFileDesc *fd) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return PR_FALSE;
+  }
+
+  CHECK_SECRET(currentSecret);
+  CHECK_SECRET(resumptionMasterSecret);
+  CHECK_SECRET(dheSecret);
+  CHECK_SECRET(clientEarlyTrafficSecret);
+  CHECK_SECRET(clientHsTrafficSecret);
+  CHECK_SECRET(serverHsTrafficSecret);
+
+  return PR_TRUE;
+}
+
+PRBool sslint_DamageTrafficSecret(PRFileDesc *fd, size_t offset) {
+  unsigned char data[32] = {0};
+  PK11SymKey **keyPtr;
+  PK11SlotInfo *slot = PK11_GetInternalSlot();
+  SECItem key_item = {siBuffer, data, sizeof(data)};
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return PR_FALSE;
+  }
+  if (!slot) {
+    return PR_FALSE;
+  }
+  keyPtr = (PK11SymKey **)((char *)&ss->ssl3.hs + offset);
+  if (!*keyPtr) {
+    return PR_FALSE;
+  }
+  PK11_FreeSymKey(*keyPtr);
+  *keyPtr = PK11_ImportSymKey(slot, CKM_NSS_HKDF_SHA256, PK11_OriginUnwrap,
+                              CKA_DERIVE, &key_item, NULL);
+  PK11_FreeSlot(slot);
+  if (!*keyPtr) {
+    return PR_FALSE;
+  }
+
+  return PR_TRUE;
+}
+
+PRBool SSLInt_DamageClientHsTrafficSecret(PRFileDesc *fd) {
+  return sslint_DamageTrafficSecret(
+      fd, offsetof(SSL3HandshakeState, clientHsTrafficSecret));
+}
+
+PRBool SSLInt_DamageServerHsTrafficSecret(PRFileDesc *fd) {
+  return sslint_DamageTrafficSecret(
+      fd, offsetof(SSL3HandshakeState, serverHsTrafficSecret));
+}
+
+PRBool SSLInt_DamageEarlyTrafficSecret(PRFileDesc *fd) {
+  return sslint_DamageTrafficSecret(
+      fd, offsetof(SSL3HandshakeState, clientEarlyTrafficSecret));
+}
+
+SECStatus SSLInt_Set0RttAlpn(PRFileDesc *fd, PRUint8 *data, unsigned int len) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+
+  ss->xtnData.nextProtoState = SSL_NEXT_PROTO_EARLY_VALUE;
+  if (ss->xtnData.nextProto.data) {
+    SECITEM_FreeItem(&ss->xtnData.nextProto, PR_FALSE);
+  }
+  if (!SECITEM_AllocItem(NULL, &ss->xtnData.nextProto, len)) return SECFailure;
+  PORT_Memcpy(ss->xtnData.nextProto.data, data, len);
+
+  return SECSuccess;
+}
+
+PRBool SSLInt_HasCertWithAuthType(PRFileDesc *fd, SSLAuthType authType) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return PR_FALSE;
+  }
+
+  return (PRBool)(!!ssl_FindServerCertByAuthType(ss, authType));
+}
+
+PRBool SSLInt_SendAlert(PRFileDesc *fd, uint8_t level, uint8_t type) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return PR_FALSE;
+  }
+
+  SECStatus rv = SSL3_SendAlert(ss, level, type);
+  if (rv != SECSuccess) return PR_FALSE;
+
+  return PR_TRUE;
+}
+
+PRBool SSLInt_SendNewSessionTicket(PRFileDesc *fd) {
+  sslSocket *ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return PR_FALSE;
+  }
+
+  ssl_GetSSL3HandshakeLock(ss);
+  ssl_GetXmitBufLock(ss);
+
+  SECStatus rv = tls13_SendNewSessionTicket(ss);
+  if (rv == SECSuccess) {
+    rv = ssl3_FlushHandshake(ss, 0);
+  }
+
+  ssl_ReleaseXmitBufLock(ss);
+  ssl_ReleaseSSL3HandshakeLock(ss);
+
+  return rv == SECSuccess;
+}
+
+SECStatus SSLInt_AdvanceReadSeqNum(PRFileDesc *fd, PRUint64 to) {
+  PRUint64 epoch;
+  sslSocket *ss;
+  ssl3CipherSpec *spec;
+
+  ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+  if (to >= (1ULL << 48)) {
+    return SECFailure;
+  }
+  ssl_GetSpecWriteLock(ss);
+  spec = ss->ssl3.crSpec;
+  epoch = spec->read_seq_num >> 48;
+  spec->read_seq_num = (epoch << 48) | to;
+
+  /* For DTLS, we need to fix the record sequence number.  For this, we can just
+   * scrub the entire structure on the assumption that the new sequence number
+   * is far enough past the last received sequence number. */
+  if (to <= spec->recvdRecords.right + DTLS_RECVD_RECORDS_WINDOW) {
+    return SECFailure;
+  }
+  dtls_RecordSetRecvd(&spec->recvdRecords, to);
+
+  ssl_ReleaseSpecWriteLock(ss);
+  return SECSuccess;
+}
+
+SECStatus SSLInt_AdvanceWriteSeqNum(PRFileDesc *fd, PRUint64 to) {
+  PRUint64 epoch;
+  sslSocket *ss;
+
+  ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+  if (to >= (1ULL << 48)) {
+    return SECFailure;
+  }
+  ssl_GetSpecWriteLock(ss);
+  epoch = ss->ssl3.cwSpec->write_seq_num >> 48;
+  ss->ssl3.cwSpec->write_seq_num = (epoch << 48) | to;
+  ssl_ReleaseSpecWriteLock(ss);
+  return SECSuccess;
+}
+
+SECStatus SSLInt_AdvanceWriteSeqByAWindow(PRFileDesc *fd, PRInt32 extra) {
+  sslSocket *ss;
+  sslSequenceNumber to;
+
+  ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+  ssl_GetSpecReadLock(ss);
+  to = ss->ssl3.cwSpec->write_seq_num + DTLS_RECVD_RECORDS_WINDOW + extra;
+  ssl_ReleaseSpecReadLock(ss);
+  return SSLInt_AdvanceWriteSeqNum(fd, to & RECORD_SEQ_MAX);
+}
+
+SSLKEAType SSLInt_GetKEAType(SSLNamedGroup group) {
+  const sslNamedGroupDef *groupDef = ssl_LookupNamedGroup(group);
+  if (!groupDef) return ssl_kea_null;
+
+  return groupDef->keaType;
+}
+
+SECStatus SSLInt_EnableShortHeaders(PRFileDesc *fd) {
+  sslSocket *ss;
+
+  ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+
+  ss->opt.enableShortHeaders = PR_TRUE;
+  return SECSuccess;
+}
+
+SECStatus SSLInt_UsingShortHeaders(PRFileDesc *fd, PRBool *result) {
+  sslSocket *ss;
+
+  ss = ssl_FindSocket(fd);
+  if (!ss) {
+    return SECFailure;
+  }
+
+  *result = ss->ssl3.hs.shortHeaders;
+
+  return SECSuccess;
+}
diff --git a/security/nss/gtests/ssl_gtest/libssl_internals.h b/security/nss/gtests/ssl_gtest/libssl_internals.h
new file mode 100644
index 0000000000..6ea66db81b
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/libssl_internals.h
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef libssl_internals_h_
+#define libssl_internals_h_
+
+#include <stdint.h>
+
+#include "prio.h"
+#include "seccomon.h"
+#include "sslt.h"
+
+SECStatus SSLInt_IncrementClientHandshakeVersion(PRFileDesc *fd);
+
+SECStatus SSLInt_UpdateSSLv2ClientRandom(PRFileDesc *fd, uint8_t *rnd,
+                                         size_t rnd_len, uint8_t *msg,
+                                         size_t msg_len);
+
+PRBool SSLInt_ExtensionNegotiated(PRFileDesc *fd, PRUint16 ext);
+void SSLInt_ClearSessionTicketKey();
+PRInt32 SSLInt_CountTls13CipherSpecs(PRFileDesc *fd);
+void SSLInt_PrintTls13CipherSpecs(PRFileDesc *fd);
+void SSLInt_ForceTimerExpiry(PRFileDesc *fd);
+SECStatus SSLInt_SetMTU(PRFileDesc *fd, PRUint16 mtu);
+PRBool SSLInt_CheckSecretsDestroyed(PRFileDesc *fd);
+PRBool SSLInt_DamageClientHsTrafficSecret(PRFileDesc *fd);
+PRBool SSLInt_DamageServerHsTrafficSecret(PRFileDesc *fd);
+PRBool SSLInt_DamageEarlyTrafficSecret(PRFileDesc *fd);
+SECStatus SSLInt_Set0RttAlpn(PRFileDesc *fd, PRUint8 *data, unsigned int len);
+PRBool SSLInt_HasCertWithAuthType(PRFileDesc *fd, SSLAuthType authType);
+PRBool SSLInt_SendAlert(PRFileDesc *fd, uint8_t level, uint8_t type);
+PRBool SSLInt_SendNewSessionTicket(PRFileDesc *fd);
+SECStatus SSLInt_AdvanceWriteSeqNum(PRFileDesc *fd, PRUint64 to);
+SECStatus SSLInt_AdvanceReadSeqNum(PRFileDesc *fd, PRUint64 to);
+SECStatus SSLInt_AdvanceWriteSeqByAWindow(PRFileDesc *fd, PRInt32 extra);
+SSLKEAType SSLInt_GetKEAType(SSLNamedGroup group);
+SECStatus SSLInt_EnableShortHeaders(PRFileDesc *fd);
+SECStatus SSLInt_UsingShortHeaders(PRFileDesc *fd, PRBool *result);
+
+#endif  // ndef libssl_internals_h_
diff --git a/security/nss/gtests/ssl_gtest/manifest.mn b/security/nss/gtests/ssl_gtest/manifest.mn
new file mode 100644
index 0000000000..391db813be
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/manifest.mn
@@ -0,0 +1,54 @@
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+CORE_DEPTH = ../..
+DEPTH      = ../..
+MODULE = nss
+
+# These sources have access to libssl internals
+CSRCS = \
+      libssl_internals.c \
+      $(NULL)
+
+CPPSRCS = \
+      ssl_0rtt_unittest.cc \
+      ssl_agent_unittest.cc \
+      ssl_auth_unittest.cc \
+      ssl_cert_ext_unittest.cc \
+      ssl_ciphersuite_unittest.cc \
+      ssl_damage_unittest.cc \
+      ssl_dhe_unittest.cc \
+      ssl_drop_unittest.cc \
+      ssl_ecdh_unittest.cc \
+      ssl_ems_unittest.cc \
+      ssl_exporter_unittest.cc \
+      ssl_extension_unittest.cc \
+      ssl_fuzz_unittest.cc \
+      ssl_gtest.cc \
+      ssl_hrr_unittest.cc \
+      ssl_loopback_unittest.cc \
+      ssl_record_unittest.cc \
+      ssl_resumption_unittest.cc \
+      ssl_skip_unittest.cc \
+      ssl_staticrsa_unittest.cc \
+      ssl_v2_client_hello_unittest.cc \
+      ssl_version_unittest.cc \
+      test_io.cc \
+      tls_agent.cc \
+      tls_connect.cc \
+      tls_hkdf_unittest.cc \
+      tls_filter.cc \
+      tls_parser.cc \
+      $(NULL)
+
+INCLUDES += -I$(CORE_DEPTH)/gtests/google_test/gtest/include \
+            -I$(CORE_DEPTH)/gtests/common
+
+REQUIRES = nspr nss libdbm gtest
+
+PROGRAM = ssl_gtest
+EXTRA_LIBS = $(DIST)/lib/$(LIB_PREFIX)gtest.$(LIB_SUFFIX) \
+             $(DIST)/lib/$(LIB_PREFIX)softokn.$(LIB_SUFFIX)
+
+USE_STATIC_LIBS = 1
diff --git a/security/nss/gtests/ssl_gtest/ssl_0rtt_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_0rtt_unittest.cc
new file mode 100644
index 0000000000..cf5a27fedf
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_0rtt_unittest.cc
@@ -0,0 +1,203 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectTls13, ZeroRtt) {
+  SetupForZeroRtt();
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(true, true);
+  Handshake();
+  ExpectEarlyDataAccepted(true);
+  CheckConnected();
+  SendReceive();
+}
+
+TEST_P(TlsConnectTls13, ZeroRttServerRejectByOption) {
+  SetupForZeroRtt();
+  client_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(true, false);
+  Handshake();
+  CheckConnected();
+  SendReceive();
+}
+
+// Test that we don't try to send 0-RTT data when the server sent
+// us a ticket without the 0-RTT flags.
+TEST_P(TlsConnectTls13, ZeroRttOptionsSetLate) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys(ssl_kea_ecdh, ssl_auth_rsa_sign);
+  Reset();
+  server_->StartConnect();
+  client_->StartConnect();
+  // Now turn on 0-RTT but too late for the ticket.
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(false, false);
+  Handshake();
+  CheckConnected();
+  SendReceive();
+}
+
+TEST_P(TlsConnectTls13, ZeroRttServerForgetTicket) {
+  SetupForZeroRtt();
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ClearServerCache();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ExpectResumption(RESUME_NONE);
+  ZeroRttSendReceive(true, false);
+  Handshake();
+  CheckConnected();
+  SendReceive();
+}
+
+TEST_P(TlsConnectTls13, ZeroRttServerOnly) {
+  ExpectResumption(RESUME_NONE);
+  server_->Set0RttEnabled(true);
+  client_->StartConnect();
+  server_->StartConnect();
+
+  // Client sends ordinary ClientHello.
+  client_->Handshake();
+
+  // Verify that the server doesn't get data.
+  uint8_t buf[100];
+  PRInt32 rv = PR_Read(server_->ssl_fd(), buf, sizeof(buf));
+  EXPECT_EQ(SECFailure, rv);
+  EXPECT_EQ(PR_WOULD_BLOCK_ERROR, PORT_GetError());
+
+  // Now make sure that things complete.
+  Handshake();
+  CheckConnected();
+  SendReceive();
+  CheckKeys();
+}
+
+TEST_P(TlsConnectTls13, TestTls13ZeroRttAlpn) {
+  EnableAlpn();
+  SetupForZeroRtt();
+  EnableAlpn();
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ExpectEarlyDataAccepted(true);
+  ZeroRttSendReceive(true, true, [this]() {
+    client_->CheckAlpn(SSL_NEXT_PROTO_EARLY_VALUE, "a");
+    return true;
+  });
+  Handshake();
+  CheckConnected();
+  SendReceive();
+  CheckAlpn("a");
+}
+
+// Have the server negotiate a different ALPN value, and therefore
+// reject 0-RTT.
+TEST_P(TlsConnectTls13, TestTls13ZeroRttAlpnChangeServer) {
+  EnableAlpn();
+  SetupForZeroRtt();
+  static const uint8_t client_alpn[] = {0x01, 0x61, 0x01, 0x62};  // "a", "b"
+  static const uint8_t server_alpn[] = {0x01, 0x62};              // "b"
+  client_->EnableAlpn(client_alpn, sizeof(client_alpn));
+  server_->EnableAlpn(server_alpn, sizeof(server_alpn));
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(true, false, [this]() {
+    client_->CheckAlpn(SSL_NEXT_PROTO_EARLY_VALUE, "a");
+    return true;
+  });
+  Handshake();
+  CheckConnected();
+  SendReceive();
+  CheckAlpn("b");
+}
+
+// Check that the client validates the ALPN selection of the server.
+// Stomp the ALPN on the client after sending the ClientHello so
+// that the server selection appears to be incorrect. The client
+// should then fail the connection.
+TEST_P(TlsConnectTls13, TestTls13ZeroRttNoAlpnServer) {
+  EnableAlpn();
+  SetupForZeroRtt();
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  EnableAlpn();
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(true, true, [this]() {
+    PRUint8 b[] = {'b'};
+    client_->CheckAlpn(SSL_NEXT_PROTO_EARLY_VALUE, "a");
+    EXPECT_EQ(SECSuccess, SSLInt_Set0RttAlpn(client_->ssl_fd(), b, sizeof(b)));
+    client_->CheckAlpn(SSL_NEXT_PROTO_EARLY_VALUE, "b");
+    return true;
+  });
+  Handshake();
+  client_->CheckErrorCode(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
+  server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+}
+
+// Set up with no ALPN and then set the client so it thinks it has ALPN.
+// The server responds without the extension and the client returns an
+// error.
+TEST_P(TlsConnectTls13, TestTls13ZeroRttNoAlpnClient) {
+  SetupForZeroRtt();
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(true, true, [this]() {
+    PRUint8 b[] = {'b'};
+    EXPECT_EQ(SECSuccess, SSLInt_Set0RttAlpn(client_->ssl_fd(), b, 1));
+    client_->CheckAlpn(SSL_NEXT_PROTO_EARLY_VALUE, "b");
+    return true;
+  });
+  Handshake();
+  client_->CheckErrorCode(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
+  server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+}
+
+// Remove the old ALPN value and so the client will not offer early data.
+TEST_P(TlsConnectTls13, TestTls13ZeroRttAlpnChangeBoth) {
+  EnableAlpn();
+  SetupForZeroRtt();
+  static const uint8_t alpn[] = {0x01, 0x62};  // "b"
+  EnableAlpn(alpn, sizeof(alpn));
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+  ZeroRttSendReceive(true, false, [this]() {
+    client_->CheckAlpn(SSL_NEXT_PROTO_NO_SUPPORT);
+    return false;
+  });
+  Handshake();
+  CheckConnected();
+  SendReceive();
+  CheckAlpn("b");
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_agent_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_agent_unittest.cc
new file mode 100644
index 0000000000..0e6ddaef87
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_agent_unittest.cc
@@ -0,0 +1,210 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+// This is an internal header, used to get TLS_1_3_DRAFT_VERSION.
+#include "ssl3prot.h"
+
+#include <memory>
+
+#include "databuffer.h"
+#include "tls_agent.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+static const uint8_t kD13 = TLS_1_3_DRAFT_VERSION;
+// This is a 1-RTT ClientHello with ECDHE.
+const static uint8_t kCannedTls13ClientHello[] = {
+    0x01, 0x00, 0x00, 0xcf, 0x03, 0x03, 0x6c, 0xb3, 0x46, 0x81, 0xc8, 0x1a,
+    0xf9, 0xd2, 0x05, 0x97, 0x48, 0x7c, 0xa8, 0x31, 0x03, 0x1c, 0x06, 0xa8,
+    0x62, 0xb1, 0x90, 0xd6, 0x21, 0x44, 0x7f, 0xc1, 0x9b, 0x87, 0x3e, 0xad,
+    0x91, 0x85, 0x00, 0x00, 0x06, 0x13, 0x01, 0x13, 0x03, 0x13, 0x02, 0x01,
+    0x00, 0x00, 0xa0, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x09, 0x00, 0x00, 0x06,
+    0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0xff, 0x01, 0x00, 0x01, 0x00, 0x00,
+    0x0a, 0x00, 0x12, 0x00, 0x10, 0x00, 0x17, 0x00, 0x18, 0x00, 0x19, 0x01,
+    0x00, 0x01, 0x01, 0x01, 0x02, 0x01, 0x03, 0x01, 0x04, 0x00, 0x28, 0x00,
+    0x47, 0x00, 0x45, 0x00, 0x17, 0x00, 0x41, 0x04, 0x86, 0x4a, 0xb9, 0xdc,
+    0x6a, 0x38, 0xa7, 0xce, 0xe7, 0xc2, 0x4f, 0xa6, 0x28, 0xb9, 0xdc, 0x65,
+    0xbf, 0x73, 0x47, 0x3c, 0x9c, 0x65, 0x8c, 0x47, 0x6d, 0x57, 0x22, 0x8a,
+    0xc2, 0xb3, 0xc6, 0x80, 0x72, 0x86, 0x08, 0x86, 0x8f, 0x52, 0xc5, 0xcb,
+    0xbf, 0x2a, 0xb5, 0x59, 0x64, 0xcc, 0x0c, 0x49, 0x95, 0x36, 0xe4, 0xd9,
+    0x2f, 0xd4, 0x24, 0x66, 0x71, 0x6f, 0x5d, 0x70, 0xe2, 0xa0, 0xea, 0x26,
+    0x00, 0x2b, 0x00, 0x03, 0x02, 0x7f, kD13, 0x00, 0x0d, 0x00, 0x20, 0x00,
+    0x1e, 0x04, 0x03, 0x05, 0x03, 0x06, 0x03, 0x02, 0x03, 0x08, 0x04, 0x08,
+    0x05, 0x08, 0x06, 0x04, 0x01, 0x05, 0x01, 0x06, 0x01, 0x02, 0x01, 0x04,
+    0x02, 0x05, 0x02, 0x06, 0x02, 0x02, 0x02};
+
+const static uint8_t kCannedTls13ServerHello[] = {
+    0x7f, kD13, 0x9c, 0xbc, 0x14, 0x9b, 0x0e, 0x2e, 0xfa, 0x0d, 0xf3, 0xf0,
+    0x5c, 0x70, 0x7a, 0xe0, 0xd1, 0x9b, 0x3e, 0x5a, 0x44, 0x6b, 0xdf, 0xe5,
+    0xc2, 0x28, 0x64, 0xf7, 0x00, 0xc1, 0x9c, 0x08, 0x76, 0x08, 0x13, 0x01,
+    0x00, 0x28, 0x00, 0x28, 0x00, 0x24, 0x00, 0x1d, 0x00, 0x20, 0xc2, 0xcf,
+    0x23, 0x17, 0x64, 0x23, 0x03, 0xf0, 0xfb, 0x45, 0x98, 0x26, 0xd1, 0x65,
+    0x24, 0xa1, 0x6c, 0xa9, 0x80, 0x8f, 0x2c, 0xac, 0x0a, 0xea, 0x53, 0x3a,
+    0xcb, 0xe3, 0x08, 0x84, 0xae, 0x19};
+static const char *k0RttData = "ABCDEF";
+
+TEST_P(TlsAgentTest, EarlyFinished) {
+  DataBuffer buffer;
+  MakeTrivialHandshakeRecord(kTlsHandshakeFinished, 0, &buffer);
+  ProcessMessage(buffer, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_FINISHED);
+}
+
+TEST_P(TlsAgentTest, EarlyCertificateVerify) {
+  DataBuffer buffer;
+  MakeTrivialHandshakeRecord(kTlsHandshakeCertificateVerify, 0, &buffer);
+  ProcessMessage(buffer, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_CERT_VERIFY);
+}
+
+TEST_P(TlsAgentTestClient, CannedHello) {
+  DataBuffer buffer;
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_3,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  DataBuffer server_hello;
+  MakeHandshakeMessage(kTlsHandshakeServerHello, kCannedTls13ServerHello,
+                       sizeof(kCannedTls13ServerHello), &server_hello);
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             server_hello.data(), server_hello.len(), &buffer);
+  ProcessMessage(buffer, TlsAgent::STATE_CONNECTING);
+}
+
+TEST_P(TlsAgentTestClient, EncryptedExtensionsInClear) {
+  DataBuffer server_hello;
+  MakeHandshakeMessage(kTlsHandshakeServerHello, kCannedTls13ServerHello,
+                       sizeof(kCannedTls13ServerHello), &server_hello);
+  DataBuffer encrypted_extensions;
+  MakeHandshakeMessage(kTlsHandshakeEncryptedExtensions, nullptr, 0,
+                       &encrypted_extensions, 1);
+  server_hello.Append(encrypted_extensions);
+  DataBuffer buffer;
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             server_hello.data(), server_hello.len(), &buffer);
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_3,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  ProcessMessage(buffer, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_HANDSHAKE);
+}
+
+TEST_F(TlsAgentStreamTestClient, EncryptedExtensionsInClearTwoPieces) {
+  DataBuffer server_hello;
+  MakeHandshakeMessage(kTlsHandshakeServerHello, kCannedTls13ServerHello,
+                       sizeof(kCannedTls13ServerHello), &server_hello);
+  DataBuffer encrypted_extensions;
+  MakeHandshakeMessage(kTlsHandshakeEncryptedExtensions, nullptr, 0,
+                       &encrypted_extensions, 1);
+  server_hello.Append(encrypted_extensions);
+  DataBuffer buffer;
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             server_hello.data(), 20, &buffer);
+
+  DataBuffer buffer2;
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             server_hello.data() + 20, server_hello.len() - 20, &buffer2);
+
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_3,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  ProcessMessage(buffer, TlsAgent::STATE_CONNECTING);
+  ProcessMessage(buffer2, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_HANDSHAKE);
+}
+
+TEST_F(TlsAgentDgramTestClient, EncryptedExtensionsInClearTwoPieces) {
+  DataBuffer server_hello_frag1;
+  MakeHandshakeMessageFragment(
+      kTlsHandshakeServerHello, kCannedTls13ServerHello,
+      sizeof(kCannedTls13ServerHello), &server_hello_frag1, 0, 0, 20);
+  DataBuffer server_hello_frag2;
+  MakeHandshakeMessageFragment(
+      kTlsHandshakeServerHello, kCannedTls13ServerHello + 20,
+      sizeof(kCannedTls13ServerHello), &server_hello_frag2, 0, 20,
+      sizeof(kCannedTls13ServerHello) - 20);
+  DataBuffer encrypted_extensions;
+  MakeHandshakeMessage(kTlsHandshakeEncryptedExtensions, nullptr, 0,
+                       &encrypted_extensions, 1);
+  server_hello_frag2.Append(encrypted_extensions);
+  DataBuffer buffer;
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             server_hello_frag1.data(), server_hello_frag1.len(), &buffer);
+
+  DataBuffer buffer2;
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             server_hello_frag2.data(), server_hello_frag2.len(), &buffer2, 1);
+
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_3,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  ProcessMessage(buffer, TlsAgent::STATE_CONNECTING);
+  ProcessMessage(buffer2, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_HANDSHAKE);
+}
+
+TEST_F(TlsAgentStreamTestClient, Set0RttOptionThenWrite) {
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  agent_->StartConnect();
+  agent_->Set0RttEnabled(true);
+  auto filter =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeClientHello);
+  agent_->SetPacketFilter(filter);
+  PRInt32 rv = PR_Write(agent_->ssl_fd(), k0RttData, strlen(k0RttData));
+  EXPECT_EQ(-1, rv);
+  int32_t err = PORT_GetError();
+  EXPECT_EQ(PR_WOULD_BLOCK_ERROR, err);
+  EXPECT_LT(0UL, filter->buffer().len());
+}
+
+TEST_F(TlsAgentStreamTestClient, Set0RttOptionThenRead) {
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  agent_->StartConnect();
+  agent_->Set0RttEnabled(true);
+  DataBuffer buffer;
+  MakeRecord(kTlsApplicationDataType, SSL_LIBRARY_VERSION_TLS_1_3,
+             reinterpret_cast<const uint8_t *>(k0RttData), strlen(k0RttData),
+             &buffer);
+  ProcessMessage(buffer, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_APPLICATION_DATA);
+}
+
+// The server is allowing 0-RTT but the client doesn't offer it,
+// so trial decryption isn't engaged and 0-RTT messages cause
+// an error.
+TEST_F(TlsAgentStreamTestServer, Set0RttOptionClientHelloThenRead) {
+  EnsureInit();
+  agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                          SSL_LIBRARY_VERSION_TLS_1_3);
+  agent_->StartConnect();
+  agent_->Set0RttEnabled(true);
+  DataBuffer buffer;
+  MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3,
+             kCannedTls13ClientHello, sizeof(kCannedTls13ClientHello), &buffer);
+  ProcessMessage(buffer, TlsAgent::STATE_CONNECTING);
+  MakeRecord(kTlsApplicationDataType, SSL_LIBRARY_VERSION_TLS_1_3,
+             reinterpret_cast<const uint8_t *>(k0RttData), strlen(k0RttData),
+             &buffer);
+  ProcessMessage(buffer, TlsAgent::STATE_ERROR, SSL_ERROR_BAD_MAC_READ);
+}
+
+INSTANTIATE_TEST_CASE_P(
+    AgentTests, TlsAgentTest,
+    ::testing::Combine(TlsAgentTestBase::kTlsRolesAll,
+                       TlsConnectTestBase::kTlsModesStream));
+INSTANTIATE_TEST_CASE_P(ClientTests, TlsAgentTestClient,
+                        TlsConnectTestBase::kTlsModesAll);
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc
new file mode 100644
index 0000000000..d663d81e0b
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_auth_unittest.cc
@@ -0,0 +1,754 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectGeneric, ServerAuthBigRsa) {
+  Reset(TlsAgent::kRsa2048);
+  Connect();
+  CheckKeys();
+}
+
+TEST_P(TlsConnectGeneric, ServerAuthRsaChain) {
+  Reset(TlsAgent::kServerRsaChain);
+  Connect();
+  CheckKeys();
+  size_t chain_length;
+  EXPECT_TRUE(client_->GetPeerChainLength(&chain_length));
+  EXPECT_EQ(2UL, chain_length);
+}
+
+TEST_P(TlsConnectGeneric, ClientAuth) {
+  client_->SetupClientAuth();
+  server_->RequestClientAuth(true);
+  Connect();
+  CheckKeys();
+}
+
+// In TLS 1.3, the client sends its cert rejection on the
+// second flight, and since it has already received the
+// server's Finished, it transitions to complete and
+// then gets an alert from the server. The test harness
+// doesn't handle this right yet.
+TEST_P(TlsConnectStream, DISABLED_ClientAuthRequiredRejected) {
+  server_->RequestClientAuth(true);
+  ConnectExpectFail();
+}
+
+TEST_P(TlsConnectGeneric, ClientAuthRequestedRejected) {
+  server_->RequestClientAuth(false);
+  Connect();
+  CheckKeys();
+}
+
+TEST_P(TlsConnectGeneric, ClientAuthEcdsa) {
+  Reset(TlsAgent::kServerEcdsa256);
+  client_->SetupClientAuth();
+  server_->RequestClientAuth(true);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_auth_ecdsa);
+}
+
+TEST_P(TlsConnectGeneric, ClientAuthBigRsa) {
+  Reset(TlsAgent::kServerRsa, TlsAgent::kRsa2048);
+  client_->SetupClientAuth();
+  server_->RequestClientAuth(true);
+  Connect();
+  CheckKeys();
+}
+
+// Offset is the position in the captured buffer where the signature sits.
+static void CheckSigScheme(TlsInspectorRecordHandshakeMessage* capture,
+                           size_t offset, TlsAgent* peer,
+                           uint16_t expected_scheme, size_t expected_size) {
+  EXPECT_LT(offset + 2U, capture->buffer().len());
+
+  uint32_t scheme = 0;
+  capture->buffer().Read(offset, 2, &scheme);
+  EXPECT_EQ(expected_scheme, static_cast<uint16_t>(scheme));
+
+  ScopedCERTCertificate remote_cert(SSL_PeerCertificate(peer->ssl_fd()));
+  ScopedSECKEYPublicKey remote_key(CERT_ExtractPublicKey(remote_cert.get()));
+  EXPECT_EQ(expected_size, SECKEY_PublicKeyStrengthInBits(remote_key.get()));
+}
+
+// The server should prefer SHA-256 by default, even for the small key size used
+// in the default certificate.
+TEST_P(TlsConnectTls12, ServerAuthCheckSigAlg) {
+  EnsureTlsSetup();
+  auto capture_ske =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerKeyExchange);
+  server_->SetPacketFilter(capture_ske);
+  Connect();
+  CheckKeys();
+
+  const DataBuffer& buffer = capture_ske->buffer();
+  EXPECT_LT(3U, buffer.len());
+  EXPECT_EQ(3U, buffer.data()[0]) << "curve_type == named_curve";
+  uint32_t tmp;
+  EXPECT_TRUE(buffer.Read(1, 2, &tmp)) << "read NamedCurve";
+  EXPECT_EQ(ssl_grp_ec_curve25519, tmp);
+  EXPECT_TRUE(buffer.Read(3, 1, &tmp)) << " read ECPoint";
+  CheckSigScheme(capture_ske, 4 + tmp, client_, ssl_sig_rsa_pss_sha256, 1024);
+}
+
+TEST_P(TlsConnectTls12, ClientAuthCheckSigAlg) {
+  EnsureTlsSetup();
+  auto capture_cert_verify =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeCertificateVerify);
+  client_->SetPacketFilter(capture_cert_verify);
+  client_->SetupClientAuth();
+  server_->RequestClientAuth(true);
+  Connect();
+  CheckKeys();
+
+  CheckSigScheme(capture_cert_verify, 0, server_, ssl_sig_rsa_pkcs1_sha1, 1024);
+}
+
+TEST_P(TlsConnectTls12, ClientAuthBigRsaCheckSigAlg) {
+  Reset(TlsAgent::kServerRsa, TlsAgent::kRsa2048);
+  auto capture_cert_verify =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeCertificateVerify);
+  client_->SetPacketFilter(capture_cert_verify);
+  client_->SetupClientAuth();
+  server_->RequestClientAuth(true);
+  Connect();
+  CheckKeys();
+  CheckSigScheme(capture_cert_verify, 0, server_, ssl_sig_rsa_pss_sha256, 2048);
+}
+
+static const SSLSignatureScheme SignatureSchemeEcdsaSha384[] = {
+    ssl_sig_ecdsa_secp384r1_sha384};
+static const SSLSignatureScheme SignatureSchemeEcdsaSha256[] = {
+    ssl_sig_ecdsa_secp256r1_sha256};
+static const SSLSignatureScheme SignatureSchemeRsaSha384[] = {
+    ssl_sig_rsa_pkcs1_sha384};
+static const SSLSignatureScheme SignatureSchemeRsaSha256[] = {
+    ssl_sig_rsa_pkcs1_sha256};
+
+static SSLNamedGroup NamedGroupForEcdsa384(uint16_t version) {
+  // NSS tries to match the group size to the symmetric cipher. In TLS 1.1 and
+  // 1.0, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA is the highest priority suite, so
+  // we use P-384. With TLS 1.2 on we pick AES-128 GCM so use x25519.
+  if (version <= SSL_LIBRARY_VERSION_TLS_1_1) {
+    return ssl_grp_ec_secp384r1;
+  }
+  return ssl_grp_ec_curve25519;
+}
+
+// When signature algorithms match up, this should connect successfully; even
+// for TLS 1.1 and 1.0, where they should be ignored.
+TEST_P(TlsConnectGeneric, SignatureAlgorithmServerAuth) {
+  Reset(TlsAgent::kServerEcdsa384);
+  client_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  server_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  Connect();
+  CheckKeys(ssl_kea_ecdh, NamedGroupForEcdsa384(version_), ssl_auth_ecdsa,
+            ssl_sig_ecdsa_secp384r1_sha384);
+}
+
+// Here the client picks a single option, which should work in all versions.
+// Defaults on the server include the first option.
+TEST_P(TlsConnectGeneric, SignatureAlgorithmClientOnly) {
+  const SSLSignatureAndHashAlg clientAlgorithms[] = {
+      {ssl_hash_sha384, ssl_sign_ecdsa},
+      {ssl_hash_sha384, ssl_sign_rsa},  // supported but unusable
+      {ssl_hash_md5, ssl_sign_ecdsa}    // unsupported and ignored
+  };
+  Reset(TlsAgent::kServerEcdsa384);
+  EnsureTlsSetup();
+  // Use the old API for this function.
+  EXPECT_EQ(SECSuccess,
+            SSL_SignaturePrefSet(client_->ssl_fd(), clientAlgorithms,
+                                 PR_ARRAY_SIZE(clientAlgorithms)));
+  Connect();
+  CheckKeys(ssl_kea_ecdh, NamedGroupForEcdsa384(version_), ssl_auth_ecdsa,
+            ssl_sig_ecdsa_secp384r1_sha384);
+}
+
+// Here the server picks a single option, which should work in all versions.
+// Defaults on the client include the provided option.
+TEST_P(TlsConnectGeneric, SignatureAlgorithmServerOnly) {
+  Reset(TlsAgent::kServerEcdsa384);
+  server_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  Connect();
+  CheckKeys(ssl_kea_ecdh, NamedGroupForEcdsa384(version_), ssl_auth_ecdsa,
+            ssl_sig_ecdsa_secp384r1_sha384);
+}
+
+// In TLS 1.2, curve and hash aren't bound together.
+TEST_P(TlsConnectTls12, SignatureSchemeCurveMismatch) {
+  Reset(TlsAgent::kServerEcdsa256);
+  client_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  Connect();
+}
+
+// In TLS 1.3, curve and hash are coupled.
+TEST_P(TlsConnectTls13, SignatureSchemeCurveMismatch) {
+  Reset(TlsAgent::kServerEcdsa256);
+  client_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  ConnectExpectFail();
+  server_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+// Configuring a P-256 cert with only SHA-384 signatures is OK in TLS 1.2.
+TEST_P(TlsConnectTls12, SignatureSchemeBadConfig) {
+  Reset(TlsAgent::kServerEcdsa256);  // P-256 cert can't be used.
+  server_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  Connect();
+}
+
+// A P-256 certificate in TLS 1.3 needs a SHA-256 signature scheme.
+TEST_P(TlsConnectTls13, SignatureSchemeBadConfig) {
+  Reset(TlsAgent::kServerEcdsa256);  // P-256 cert can't be used.
+  server_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  ConnectExpectFail();
+  server_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+// Where there is no overlap on signature schemes, we still connect successfully
+// if we aren't going to use a signature.
+TEST_P(TlsConnectGenericPre13, SignatureAlgorithmNoOverlapStaticRsa) {
+  client_->SetSignatureSchemes(SignatureSchemeRsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeRsaSha384));
+  server_->SetSignatureSchemes(SignatureSchemeRsaSha256,
+                               PR_ARRAY_SIZE(SignatureSchemeRsaSha256));
+  EnableOnlyStaticRsaCiphers();
+  Connect();
+  CheckKeys(ssl_kea_rsa, ssl_auth_rsa_decrypt);
+}
+
+TEST_P(TlsConnectTls12Plus, SignatureAlgorithmNoOverlapEcdsa) {
+  Reset(TlsAgent::kServerEcdsa256);
+  client_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  server_->SetSignatureSchemes(SignatureSchemeEcdsaSha256,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha256));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  server_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
+}
+
+// Pre 1.2, a mismatch on signature algorithms shouldn't affect anything.
+TEST_P(TlsConnectPre12, SignatureAlgorithmNoOverlapEcdsa) {
+  Reset(TlsAgent::kServerEcdsa256);
+  client_->SetSignatureSchemes(SignatureSchemeEcdsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha384));
+  server_->SetSignatureSchemes(SignatureSchemeEcdsaSha256,
+                               PR_ARRAY_SIZE(SignatureSchemeEcdsaSha256));
+  Connect();
+}
+
+// The signature_algorithms extension is mandatory in TLS 1.3.
+TEST_P(TlsConnectTls13, SignatureAlgorithmDrop) {
+  client_->SetPacketFilter(
+      new TlsExtensionDropper(ssl_signature_algorithms_xtn));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_MISSING_EXTENSION_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_MISSING_SIGNATURE_ALGORITHMS_EXTENSION);
+}
+
+// TLS 1.2 has trouble detecting this sort of modification: it uses SHA1 and
+// only fails when the Finished is checked.
+TEST_P(TlsConnectTls12, SignatureAlgorithmDrop) {
+  client_->SetPacketFilter(
+      new TlsExtensionDropper(ssl_signature_algorithms_xtn));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+}
+
+TEST_P(TlsConnectTls12Plus, RequestClientAuthWithSha384) {
+  server_->SetSignatureSchemes(SignatureSchemeRsaSha384,
+                               PR_ARRAY_SIZE(SignatureSchemeRsaSha384));
+  server_->RequestClientAuth(false);
+  Connect();
+}
+
+class BeforeFinished : public TlsRecordFilter {
+ private:
+  enum HandshakeState { BEFORE_CCS, AFTER_CCS, DONE };
+
+ public:
+  BeforeFinished(TlsAgent* client, TlsAgent* server, VoidFunction before_ccs,
+                 VoidFunction before_finished)
+      : client_(client),
+        server_(server),
+        before_ccs_(before_ccs),
+        before_finished_(before_finished),
+        state_(BEFORE_CCS) {}
+
+ protected:
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& body,
+                                            DataBuffer* out) {
+    switch (state_) {
+      case BEFORE_CCS:
+        // Awaken when we see the CCS.
+        if (header.content_type() == kTlsChangeCipherSpecType) {
+          before_ccs_();
+
+          // Write the CCS out as a separate write, so that we can make
+          // progress. Ordinarily, libssl sends the CCS and Finished together,
+          // but that means that they both get processed together.
+          DataBuffer ccs;
+          header.Write(&ccs, 0, body);
+          server_->SendDirect(ccs);
+          client_->Handshake();
+          state_ = AFTER_CCS;
+          // Request that the original record be dropped by the filter.
+          return DROP;
+        }
+        break;
+
+      case AFTER_CCS:
+        EXPECT_EQ(kTlsHandshakeType, header.content_type());
+        // This could check that data contains a Finished message, but it's
+        // encrypted, so that's too much extra work.
+
+        before_finished_();
+        state_ = DONE;
+        break;
+
+      case DONE:
+        break;
+    }
+    return KEEP;
+  }
+
+ private:
+  TlsAgent* client_;
+  TlsAgent* server_;
+  VoidFunction before_ccs_;
+  VoidFunction before_finished_;
+  HandshakeState state_;
+};
+
+// Running code after the client has started processing the encrypted part of
+// the server's first flight, but before the Finished is processed is very hard
+// in TLS 1.3.  These encrypted messages are sent in a single encrypted blob.
+// The following test uses DTLS to make it possible to force the client to
+// process the handshake in pieces.
+//
+// The first encrypted message from the server is dropped, and the MTU is
+// reduced to just below the original message size so that the server sends two
+// messages.  The Finished message is then processed separately.
+class BeforeFinished13 : public PacketFilter {
+ private:
+  enum HandshakeState {
+    INIT,
+    BEFORE_FIRST_FRAGMENT,
+    BEFORE_SECOND_FRAGMENT,
+    DONE
+  };
+
+ public:
+  BeforeFinished13(TlsAgent* client, TlsAgent* server,
+                   VoidFunction before_finished)
+      : client_(client),
+        server_(server),
+        before_finished_(before_finished),
+        records_(0) {}
+
+ protected:
+  virtual PacketFilter::Action Filter(const DataBuffer& input,
+                                      DataBuffer* output) {
+    switch (++records_) {
+      case 1:
+        // Packet 1 is the server's entire first flight.  Drop it.
+        EXPECT_EQ(SECSuccess,
+                  SSLInt_SetMTU(server_->ssl_fd(), input.len() - 1));
+        return DROP;
+
+      // Packet 2 is the first part of the server's retransmitted first
+      // flight.  Keep that.
+
+      case 3:
+        // Packet 3 is the second part of the server's retransmitted first
+        // flight.  Before passing that on, make sure that the client processes
+        // packet 2, then call the before_finished_() callback.
+        client_->Handshake();
+        before_finished_();
+        break;
+
+      default:
+        break;
+    }
+    return KEEP;
+  }
+
+ private:
+  TlsAgent* client_;
+  TlsAgent* server_;
+  VoidFunction before_finished_;
+  size_t records_;
+};
+
+static SECStatus AuthCompleteBlock(TlsAgent*, PRBool, PRBool) {
+  return SECWouldBlock;
+}
+
+// This test uses an AuthCertificateCallback that blocks.  A filter is used to
+// split the server's first flight into two pieces.  Before the second piece is
+// processed by the client, SSL_AuthCertificateComplete() is called.
+TEST_F(TlsConnectDatagram13, AuthCompleteBeforeFinished) {
+  client_->SetAuthCertificateCallback(AuthCompleteBlock);
+  server_->SetPacketFilter(new BeforeFinished13(client_, server_, [this]() {
+    EXPECT_EQ(SECSuccess, SSL_AuthCertificateComplete(client_->ssl_fd(), 0));
+  }));
+  Connect();
+}
+
+static void TriggerAuthComplete(PollTarget* target, Event event) {
+  std::cerr << "client: call SSL_AuthCertificateComplete" << std::endl;
+  EXPECT_EQ(TIMER_EVENT, event);
+  TlsAgent* client = static_cast<TlsAgent*>(target);
+  EXPECT_EQ(SECSuccess, SSL_AuthCertificateComplete(client->ssl_fd(), 0));
+}
+
+// This test uses a simple AuthCertificateCallback.  Due to the way that the
+// entire server flight is processed, the call to SSL_AuthCertificateComplete
+// will trigger after the Finished message is processed.
+TEST_F(TlsConnectDatagram13, AuthCompleteAfterFinished) {
+  client_->SetAuthCertificateCallback(
+      [this](TlsAgent*, PRBool, PRBool) -> SECStatus {
+        Poller::Timer* timer_handle;
+        // This is really just to unroll the stack.
+        Poller::Instance()->SetTimer(1U, client_, TriggerAuthComplete,
+                                     &timer_handle);
+        return SECWouldBlock;
+      });
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, ClientWriteBetweenCCSAndFinishedWithFalseStart) {
+  client_->EnableFalseStart();
+  server_->SetPacketFilter(new BeforeFinished(
+      client_, server_,
+      [this]() { EXPECT_TRUE(client_->can_falsestart_hook_called()); },
+      [this]() {
+        // Write something, which used to fail: bug 1235366.
+        client_->SendData(10);
+      }));
+
+  Connect();
+  server_->SendData(10);
+  Receive(10);
+}
+
+TEST_P(TlsConnectGenericPre13, AuthCompleteBeforeFinishedWithFalseStart) {
+  client_->EnableFalseStart();
+  client_->SetAuthCertificateCallback(AuthCompleteBlock);
+  server_->SetPacketFilter(new BeforeFinished(
+      client_, server_,
+      []() {
+        // Do nothing before CCS
+      },
+      [this]() {
+        EXPECT_FALSE(client_->can_falsestart_hook_called());
+        // AuthComplete before Finished still enables false start.
+        EXPECT_EQ(SECSuccess,
+                  SSL_AuthCertificateComplete(client_->ssl_fd(), 0));
+        EXPECT_TRUE(client_->can_falsestart_hook_called());
+        client_->SendData(10);
+      }));
+
+  Connect();
+  server_->SendData(10);
+  Receive(10);
+}
+
+class EnforceNoActivity : public PacketFilter {
+ protected:
+  PacketFilter::Action Filter(const DataBuffer& input,
+                              DataBuffer* output) override {
+    std::cerr << "Unexpected packet: " << input << std::endl;
+    EXPECT_TRUE(false) << "should not send anything";
+    return KEEP;
+  }
+};
+
+// In this test, we want to make sure that the server completes its handshake,
+// but the client does not.  Because the AuthCertificate callback blocks and we
+// never call SSL_AuthCertificateComplete(), the client should never report that
+// it has completed the handshake.  Manually call Handshake(), alternating sides
+// between client and server, until the desired state is reached.
+TEST_P(TlsConnectGenericPre13, AuthCompleteDelayed) {
+  client_->SetAuthCertificateCallback(AuthCompleteBlock);
+
+  server_->StartConnect();
+  client_->StartConnect();
+  client_->Handshake();  // Send ClientHello
+  server_->Handshake();  // Send ServerHello
+  client_->Handshake();  // Send ClientKeyExchange and Finished
+  server_->Handshake();  // Send Finished
+  // The server should now report that it is connected
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, server_->state());
+
+  // The client should send nothing from here on.
+  client_->SetPacketFilter(new EnforceNoActivity());
+  client_->Handshake();
+  EXPECT_EQ(TlsAgent::STATE_CONNECTING, client_->state());
+
+  // This should allow the handshake to complete now.
+  EXPECT_EQ(SECSuccess, SSL_AuthCertificateComplete(client_->ssl_fd(), 0));
+  client_->Handshake();  // Transition to connected
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, client_->state());
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, server_->state());
+
+  // Remove this before closing or the close_notify alert will trigger it.
+  client_->SetPacketFilter(nullptr);
+}
+
+// TLS 1.3 handles a delayed AuthComplete callback differently since the
+// shape of the handshake is different.
+TEST_P(TlsConnectTls13, AuthCompleteDelayed) {
+  client_->SetAuthCertificateCallback(AuthCompleteBlock);
+
+  server_->StartConnect();
+  client_->StartConnect();
+  client_->Handshake();  // Send ClientHello
+  server_->Handshake();  // Send ServerHello
+  EXPECT_EQ(TlsAgent::STATE_CONNECTING, client_->state());
+  EXPECT_EQ(TlsAgent::STATE_CONNECTING, server_->state());
+
+  // The client will send nothing until AuthCertificateComplete is called.
+  client_->SetPacketFilter(new EnforceNoActivity());
+  client_->Handshake();
+  EXPECT_EQ(TlsAgent::STATE_CONNECTING, client_->state());
+
+  // This should allow the handshake to complete now.
+  client_->SetPacketFilter(nullptr);
+  EXPECT_EQ(SECSuccess, SSL_AuthCertificateComplete(client_->ssl_fd(), 0));
+  client_->Handshake();  // Send Finished
+  server_->Handshake();  // Transition to connected and send NewSessionTicket
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, client_->state());
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, server_->state());
+}
+
+static const SSLExtraServerCertData ServerCertDataRsaPkcs1Decrypt = {
+    ssl_auth_rsa_decrypt, nullptr, nullptr, nullptr};
+static const SSLExtraServerCertData ServerCertDataRsaPkcs1Sign = {
+    ssl_auth_rsa_sign, nullptr, nullptr, nullptr};
+static const SSLExtraServerCertData ServerCertDataRsaPss = {
+    ssl_auth_rsa_pss, nullptr, nullptr, nullptr};
+
+// Test RSA cert with usage=[signature, encipherment].
+TEST_F(TlsAgentStreamTestServer, ConfigureCertRsaPkcs1SignAndKEX) {
+  Reset(TlsAgent::kServerRsa);
+
+  PRFileDesc* ssl_fd = agent_->ssl_fd();
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_decrypt));
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_sign));
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_pss));
+
+  // Configuring for only rsa_sign, rsa_pss, or rsa_decrypt should work.
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsa, false,
+                                       &ServerCertDataRsaPkcs1Decrypt));
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsa, false,
+                                       &ServerCertDataRsaPkcs1Sign));
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsa, false,
+                                       &ServerCertDataRsaPss));
+}
+
+// Test RSA cert with usage=[signature].
+TEST_F(TlsAgentStreamTestServer, ConfigureCertRsaPkcs1Sign) {
+  Reset(TlsAgent::kServerRsaSign);
+
+  PRFileDesc* ssl_fd = agent_->ssl_fd();
+  EXPECT_FALSE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_decrypt));
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_sign));
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_pss));
+
+  // Configuring for only rsa_decrypt should fail.
+  EXPECT_FALSE(agent_->ConfigServerCert(TlsAgent::kServerRsaSign, false,
+                                        &ServerCertDataRsaPkcs1Decrypt));
+
+  // Configuring for only rsa_sign or rsa_pss should work.
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsaSign, false,
+                                       &ServerCertDataRsaPkcs1Sign));
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsaSign, false,
+                                       &ServerCertDataRsaPss));
+}
+
+// Test RSA cert with usage=[encipherment].
+TEST_F(TlsAgentStreamTestServer, ConfigureCertRsaPkcs1KEX) {
+  Reset(TlsAgent::kServerRsaDecrypt);
+
+  PRFileDesc* ssl_fd = agent_->ssl_fd();
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_decrypt));
+  EXPECT_FALSE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_sign));
+  EXPECT_FALSE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_pss));
+
+  // Configuring for only rsa_sign or rsa_pss should fail.
+  EXPECT_FALSE(agent_->ConfigServerCert(TlsAgent::kServerRsaDecrypt, false,
+                                        &ServerCertDataRsaPkcs1Sign));
+  EXPECT_FALSE(agent_->ConfigServerCert(TlsAgent::kServerRsaDecrypt, false,
+                                        &ServerCertDataRsaPss));
+
+  // Configuring for only rsa_decrypt should work.
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsaDecrypt, false,
+                                       &ServerCertDataRsaPkcs1Decrypt));
+}
+
+// Test configuring an RSA-PSS cert.
+TEST_F(TlsAgentStreamTestServer, ConfigureCertRsaPss) {
+  Reset(TlsAgent::kServerRsaPss);
+
+  PRFileDesc* ssl_fd = agent_->ssl_fd();
+  EXPECT_FALSE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_decrypt));
+  EXPECT_FALSE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_sign));
+  EXPECT_TRUE(SSLInt_HasCertWithAuthType(ssl_fd, ssl_auth_rsa_pss));
+
+  // Configuring for only rsa_sign or rsa_decrypt should fail.
+  EXPECT_FALSE(agent_->ConfigServerCert(TlsAgent::kServerRsaPss, false,
+                                        &ServerCertDataRsaPkcs1Sign));
+  EXPECT_FALSE(agent_->ConfigServerCert(TlsAgent::kServerRsaPss, false,
+                                        &ServerCertDataRsaPkcs1Decrypt));
+
+  // Configuring for only rsa_pss should work.
+  EXPECT_TRUE(agent_->ConfigServerCert(TlsAgent::kServerRsaPss, false,
+                                       &ServerCertDataRsaPss));
+}
+
+// mode, version, certificate, auth type, signature scheme
+typedef std::tuple<std::string, uint16_t, std::string, SSLAuthType,
+                   SSLSignatureScheme>
+    SignatureSchemeProfile;
+
+class TlsSignatureSchemeConfiguration
+    : public TlsConnectTestBase,
+      public ::testing::WithParamInterface<SignatureSchemeProfile> {
+ public:
+  TlsSignatureSchemeConfiguration()
+      : TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())),
+        certificate_(std::get<2>(GetParam())),
+        auth_type_(std::get<3>(GetParam())),
+        signature_scheme_(std::get<4>(GetParam())) {}
+
+ protected:
+  void TestSignatureSchemeConfig(TlsAgent* configPeer) {
+    EnsureTlsSetup();
+    configPeer->SetSignatureSchemes(&signature_scheme_, 1);
+    Connect();
+    CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, auth_type_,
+              signature_scheme_);
+  }
+
+  std::string certificate_;
+  SSLAuthType auth_type_;
+  SSLSignatureScheme signature_scheme_;
+};
+
+TEST_P(TlsSignatureSchemeConfiguration, SignatureSchemeConfigServer) {
+  Reset(certificate_);
+  TestSignatureSchemeConfig(server_);
+}
+
+TEST_P(TlsSignatureSchemeConfiguration, SignatureSchemeConfigClient) {
+  Reset(certificate_);
+  TlsExtensionCapture* capture =
+      new TlsExtensionCapture(ssl_signature_algorithms_xtn);
+  client_->SetPacketFilter(capture);
+  TestSignatureSchemeConfig(client_);
+
+  const DataBuffer& ext = capture->extension();
+  ASSERT_EQ(2U + 2U, ext.len());
+  uint32_t v = 0;
+  ASSERT_TRUE(ext.Read(0, 2, &v));
+  EXPECT_EQ(2U, v);
+  ASSERT_TRUE(ext.Read(2, 2, &v));
+  EXPECT_EQ(signature_scheme_, static_cast<SSLSignatureScheme>(v));
+}
+
+TEST_P(TlsSignatureSchemeConfiguration, SignatureSchemeConfigBoth) {
+  Reset(certificate_);
+  EnsureTlsSetup();
+  client_->SetSignatureSchemes(&signature_scheme_, 1);
+  server_->SetSignatureSchemes(&signature_scheme_, 1);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, auth_type_, signature_scheme_);
+}
+
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeRsa, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(
+        TlsConnectTestBase::kTlsModesAll, TlsConnectTestBase::kTlsV12Plus,
+        ::testing::Values(TlsAgent::kServerRsaSign),
+        ::testing::Values(ssl_auth_rsa_sign),
+        ::testing::Values(ssl_sig_rsa_pkcs1_sha256, ssl_sig_rsa_pkcs1_sha384,
+                          ssl_sig_rsa_pkcs1_sha512, ssl_sig_rsa_pss_sha256,
+                          ssl_sig_rsa_pss_sha384)));
+// PSS with SHA-512 needs a bigger key to work.
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeBigRsa, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                       TlsConnectTestBase::kTlsV12Plus,
+                       ::testing::Values(TlsAgent::kRsa2048),
+                       ::testing::Values(ssl_auth_rsa_sign),
+                       ::testing::Values(ssl_sig_rsa_pss_sha512)));
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeRsaSha1, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                       TlsConnectTestBase::kTlsV12,
+                       ::testing::Values(TlsAgent::kServerRsa),
+                       ::testing::Values(ssl_auth_rsa_sign),
+                       ::testing::Values(ssl_sig_rsa_pkcs1_sha1)));
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeEcdsaP256, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                       TlsConnectTestBase::kTlsV12Plus,
+                       ::testing::Values(TlsAgent::kServerEcdsa256),
+                       ::testing::Values(ssl_auth_ecdsa),
+                       ::testing::Values(ssl_sig_ecdsa_secp256r1_sha256)));
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeEcdsaP384, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                       TlsConnectTestBase::kTlsV12Plus,
+                       ::testing::Values(TlsAgent::kServerEcdsa384),
+                       ::testing::Values(ssl_auth_ecdsa),
+                       ::testing::Values(ssl_sig_ecdsa_secp384r1_sha384)));
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeEcdsaP521, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                       TlsConnectTestBase::kTlsV12Plus,
+                       ::testing::Values(TlsAgent::kServerEcdsa521),
+                       ::testing::Values(ssl_auth_ecdsa),
+                       ::testing::Values(ssl_sig_ecdsa_secp521r1_sha512)));
+INSTANTIATE_TEST_CASE_P(
+    SignatureSchemeEcdsaSha1, TlsSignatureSchemeConfiguration,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                       TlsConnectTestBase::kTlsV12,
+                       ::testing::Values(TlsAgent::kServerEcdsa256,
+                                         TlsAgent::kServerEcdsa384),
+                       ::testing::Values(ssl_auth_ecdsa),
+                       ::testing::Values(ssl_sig_ecdsa_sha1)));
+}
diff --git a/security/nss/gtests/ssl_gtest/ssl_cert_ext_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_cert_ext_unittest.cc
new file mode 100644
index 0000000000..876c368819
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_cert_ext_unittest.cc
@@ -0,0 +1,214 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+#include <memory>
+
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+// Tests for Certificate Transparency (RFC 6962)
+// These don't work with TLS 1.3: see bug 1252745.
+
+// Helper class - stores signed certificate timestamps as provided
+// by the relevant callbacks on the client.
+class SignedCertificateTimestampsExtractor {
+ public:
+  SignedCertificateTimestampsExtractor(TlsAgent* client) : client_(client) {
+    client_->SetAuthCertificateCallback(
+        [&](TlsAgent* agent, bool checksig, bool isServer) -> SECStatus {
+          const SECItem* scts = SSL_PeerSignedCertTimestamps(agent->ssl_fd());
+          EXPECT_TRUE(scts);
+          if (!scts) {
+            return SECFailure;
+          }
+          auth_timestamps_.reset(new DataBuffer(scts->data, scts->len));
+          return SECSuccess;
+        });
+    client_->SetHandshakeCallback([&](TlsAgent* agent) {
+      const SECItem* scts = SSL_PeerSignedCertTimestamps(agent->ssl_fd());
+      ASSERT_TRUE(scts);
+      handshake_timestamps_.reset(new DataBuffer(scts->data, scts->len));
+    });
+  }
+
+  void assertTimestamps(const DataBuffer& timestamps) {
+    EXPECT_TRUE(auth_timestamps_);
+    EXPECT_EQ(timestamps, *auth_timestamps_);
+
+    EXPECT_TRUE(handshake_timestamps_);
+    EXPECT_EQ(timestamps, *handshake_timestamps_);
+
+    const SECItem* current = SSL_PeerSignedCertTimestamps(client_->ssl_fd());
+    EXPECT_EQ(timestamps, DataBuffer(current->data, current->len));
+  }
+
+ private:
+  TlsAgent* client_;
+  std::unique_ptr<DataBuffer> auth_timestamps_;
+  std::unique_ptr<DataBuffer> handshake_timestamps_;
+};
+
+static const uint8_t kSctValue[] = {0x01, 0x23, 0x45, 0x67, 0x89};
+static const SECItem kSctItem = {siBuffer, const_cast<uint8_t*>(kSctValue),
+                                 sizeof(kSctValue)};
+static const DataBuffer kSctBuffer(kSctValue, sizeof(kSctValue));
+
+// Test timestamps extraction during a successful handshake.
+TEST_P(TlsConnectGeneric, SignedCertificateTimestampsHandshake) {
+  EnsureTlsSetup();
+  EXPECT_EQ(SECSuccess, SSL_SetSignedCertTimestamps(server_->ssl_fd(),
+                                                    &kSctItem, ssl_kea_rsa));
+  EXPECT_EQ(SECSuccess,
+            SSL_OptionSet(client_->ssl_fd(), SSL_ENABLE_SIGNED_CERT_TIMESTAMPS,
+                          PR_TRUE));
+  SignedCertificateTimestampsExtractor timestamps_extractor(client_);
+
+  Connect();
+
+  timestamps_extractor.assertTimestamps(kSctBuffer);
+}
+
+TEST_P(TlsConnectGeneric, SignedCertificateTimestampsConfig) {
+  static const SSLExtraServerCertData kExtraData = {ssl_auth_rsa_sign, nullptr,
+                                                    nullptr, &kSctItem};
+
+  EnsureTlsSetup();
+  EXPECT_TRUE(
+      server_->ConfigServerCert(TlsAgent::kServerRsa, true, &kExtraData));
+  EXPECT_EQ(SECSuccess,
+            SSL_OptionSet(client_->ssl_fd(), SSL_ENABLE_SIGNED_CERT_TIMESTAMPS,
+                          PR_TRUE));
+  SignedCertificateTimestampsExtractor timestamps_extractor(client_);
+
+  Connect();
+
+  timestamps_extractor.assertTimestamps(kSctBuffer);
+}
+
+// Test SSL_PeerSignedCertTimestamps returning zero-length SECItem
+// when the client / the server / both have not enabled the feature.
+TEST_P(TlsConnectGeneric, SignedCertificateTimestampsInactiveClient) {
+  EnsureTlsSetup();
+  EXPECT_EQ(SECSuccess, SSL_SetSignedCertTimestamps(server_->ssl_fd(),
+                                                    &kSctItem, ssl_kea_rsa));
+  SignedCertificateTimestampsExtractor timestamps_extractor(client_);
+
+  Connect();
+  timestamps_extractor.assertTimestamps(DataBuffer());
+}
+
+TEST_P(TlsConnectGeneric, SignedCertificateTimestampsInactiveServer) {
+  EnsureTlsSetup();
+  EXPECT_EQ(SECSuccess,
+            SSL_OptionSet(client_->ssl_fd(), SSL_ENABLE_SIGNED_CERT_TIMESTAMPS,
+                          PR_TRUE));
+  SignedCertificateTimestampsExtractor timestamps_extractor(client_);
+
+  Connect();
+  timestamps_extractor.assertTimestamps(DataBuffer());
+}
+
+TEST_P(TlsConnectGeneric, SignedCertificateTimestampsInactiveBoth) {
+  EnsureTlsSetup();
+  SignedCertificateTimestampsExtractor timestamps_extractor(client_);
+
+  Connect();
+  timestamps_extractor.assertTimestamps(DataBuffer());
+}
+
+// Check that the given agent doesn't have an OCSP response for its peer.
+static SECStatus CheckNoOCSP(TlsAgent* agent, bool checksig, bool isServer) {
+  const SECItemArray* ocsp = SSL_PeerStapledOCSPResponses(agent->ssl_fd());
+  EXPECT_TRUE(ocsp);
+  EXPECT_EQ(0U, ocsp->len);
+  return SECSuccess;
+}
+
+static const uint8_t kOcspValue1[] = {1, 2, 3, 4, 5, 6};
+static const uint8_t kOcspValue2[] = {7, 8, 9};
+static const SECItem kOcspItems[] = {
+    {siBuffer, const_cast<uint8_t*>(kOcspValue1), sizeof(kOcspValue1)},
+    {siBuffer, const_cast<uint8_t*>(kOcspValue2), sizeof(kOcspValue2)}};
+static const SECItemArray kOcspResponses = {const_cast<SECItem*>(kOcspItems),
+                                            PR_ARRAY_SIZE(kOcspItems)};
+const static SSLExtraServerCertData kOcspExtraData = {
+    ssl_auth_rsa_sign, nullptr, &kOcspResponses, nullptr};
+
+TEST_P(TlsConnectGeneric, NoOcsp) {
+  EnsureTlsSetup();
+  client_->SetAuthCertificateCallback(CheckNoOCSP);
+  Connect();
+}
+
+// The client doesn't get OCSP stapling unless it asks.
+TEST_P(TlsConnectGeneric, OcspNotRequested) {
+  EnsureTlsSetup();
+  client_->SetAuthCertificateCallback(CheckNoOCSP);
+  EXPECT_TRUE(
+      server_->ConfigServerCert(TlsAgent::kServerRsa, true, &kOcspExtraData));
+  Connect();
+}
+
+// Even if the client asks, the server has nothing unless it is configured.
+TEST_P(TlsConnectGeneric, OcspNotProvided) {
+  EnsureTlsSetup();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_ENABLE_OCSP_STAPLING, PR_TRUE));
+  client_->SetAuthCertificateCallback(CheckNoOCSP);
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, OcspMangled) {
+  EnsureTlsSetup();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_ENABLE_OCSP_STAPLING, PR_TRUE));
+  EXPECT_TRUE(
+      server_->ConfigServerCert(TlsAgent::kServerRsa, true, &kOcspExtraData));
+
+  static const uint8_t val[] = {1};
+  auto replacer = new TlsExtensionReplacer(ssl_cert_status_xtn,
+                                           DataBuffer(val, sizeof(val)));
+  server_->SetPacketFilter(replacer);
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
+  server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+}
+
+TEST_P(TlsConnectGeneric, OcspSuccess) {
+  EnsureTlsSetup();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_ENABLE_OCSP_STAPLING, PR_TRUE));
+  auto capture_ocsp = new TlsExtensionCapture(ssl_cert_status_xtn);
+  server_->SetPacketFilter(capture_ocsp);
+
+  // The value should be available during the AuthCertificateCallback
+  client_->SetAuthCertificateCallback([](TlsAgent* agent, bool checksig,
+                                         bool isServer) -> SECStatus {
+    const SECItemArray* ocsp = SSL_PeerStapledOCSPResponses(agent->ssl_fd());
+    if (!ocsp) {
+      return SECFailure;
+    }
+    EXPECT_EQ(1U, ocsp->len) << "We only provide the first item";
+    EXPECT_EQ(0, SECITEM_CompareItem(&kOcspItems[0], &ocsp->items[0]));
+    return SECSuccess;
+  });
+  EXPECT_TRUE(
+      server_->ConfigServerCert(TlsAgent::kServerRsa, true, &kOcspExtraData));
+
+  Connect();
+  // In TLS 1.3, the server doesn't provide a visible ServerHello extension.
+  // For earlier versions, the extension is just empty.
+  EXPECT_EQ(0U, capture_ocsp->extension().len());
+}
+
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_ciphersuite_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_ciphersuite_unittest.cc
new file mode 100644
index 0000000000..ab10a84a03
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_ciphersuite_unittest.cc
@@ -0,0 +1,455 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "tls_connect.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+// mode, version, cipher suite
+typedef std::tuple<std::string, uint16_t, uint16_t, SSLNamedGroup,
+                   SSLSignatureScheme>
+    CipherSuiteProfile;
+
+class TlsCipherSuiteTestBase : public TlsConnectTestBase {
+ public:
+  TlsCipherSuiteTestBase(const std::string &mode, uint16_t version,
+                         uint16_t cipher_suite, SSLNamedGroup group,
+                         SSLSignatureScheme signature_scheme)
+      : TlsConnectTestBase(mode, version),
+        cipher_suite_(cipher_suite),
+        group_(group),
+        signature_scheme_(signature_scheme),
+        csinfo_({0}) {
+    SECStatus rv =
+        SSL_GetCipherSuiteInfo(cipher_suite_, &csinfo_, sizeof(csinfo_));
+    EXPECT_EQ(SECSuccess, rv);
+    if (rv == SECSuccess) {
+      std::cerr << "Cipher suite: " << csinfo_.cipherSuiteName << std::endl;
+    }
+    auth_type_ = csinfo_.authType;
+    kea_type_ = csinfo_.keaType;
+  }
+
+ protected:
+  void EnableSingleCipher() {
+    EnsureTlsSetup();
+    // It doesn't matter which does this, but the test is better if both do it.
+    client_->EnableSingleCipher(cipher_suite_);
+    server_->EnableSingleCipher(cipher_suite_);
+
+    if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+      std::vector<SSLNamedGroup> groups = {group_};
+      client_->ConfigNamedGroups(groups);
+      server_->ConfigNamedGroups(groups);
+      kea_type_ = SSLInt_GetKEAType(group_);
+
+      client_->SetSignatureSchemes(&signature_scheme_, 1);
+      server_->SetSignatureSchemes(&signature_scheme_, 1);
+    }
+  }
+
+  virtual void SetupCertificate() {
+    if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+      switch (signature_scheme_) {
+        case ssl_sig_rsa_pkcs1_sha256:
+        case ssl_sig_rsa_pkcs1_sha384:
+        case ssl_sig_rsa_pkcs1_sha512:
+          Reset(TlsAgent::kServerRsaSign);
+          auth_type_ = ssl_auth_rsa_sign;
+          break;
+        case ssl_sig_rsa_pss_sha256:
+        case ssl_sig_rsa_pss_sha384:
+          Reset(TlsAgent::kServerRsaSign);
+          auth_type_ = ssl_auth_rsa_sign;
+          break;
+        case ssl_sig_rsa_pss_sha512:
+          // You can't fit SHA-512 PSS in a 1024-bit key.
+          Reset(TlsAgent::kRsa2048);
+          auth_type_ = ssl_auth_rsa_sign;
+          break;
+        case ssl_sig_ecdsa_secp256r1_sha256:
+          Reset(TlsAgent::kServerEcdsa256);
+          auth_type_ = ssl_auth_ecdsa;
+          break;
+        case ssl_sig_ecdsa_secp384r1_sha384:
+          Reset(TlsAgent::kServerEcdsa384);
+          auth_type_ = ssl_auth_ecdsa;
+          break;
+        default:
+          ASSERT_TRUE(false) << "Unsupported signature scheme: "
+                             << signature_scheme_;
+          break;
+      }
+    } else {
+      switch (csinfo_.authType) {
+        case ssl_auth_rsa_sign:
+          Reset(TlsAgent::kServerRsaSign);
+          break;
+        case ssl_auth_rsa_decrypt:
+          Reset(TlsAgent::kServerRsaDecrypt);
+          break;
+        case ssl_auth_ecdsa:
+          Reset(TlsAgent::kServerEcdsa256);
+          break;
+        case ssl_auth_ecdh_ecdsa:
+          Reset(TlsAgent::kServerEcdhEcdsa);
+          break;
+        case ssl_auth_ecdh_rsa:
+          Reset(TlsAgent::kServerEcdhRsa);
+          break;
+        case ssl_auth_dsa:
+          Reset(TlsAgent::kServerDsa);
+          break;
+        default:
+          ASSERT_TRUE(false) << "Unsupported cipher suite: " << cipher_suite_;
+          break;
+      }
+    }
+  }
+
+  void ConnectAndCheckCipherSuite() {
+    Connect();
+    SendReceive();
+
+    // Check that we used the right cipher suite.
+    uint16_t actual;
+    EXPECT_TRUE(client_->cipher_suite(&actual) && actual == cipher_suite_);
+    EXPECT_TRUE(server_->cipher_suite(&actual) && actual == cipher_suite_);
+    SSLAuthType auth;
+    EXPECT_TRUE(client_->auth_type(&auth) && auth == auth_type_);
+    EXPECT_TRUE(server_->auth_type(&auth) && auth == auth_type_);
+    SSLKEAType kea;
+    EXPECT_TRUE(client_->kea_type(&kea) && kea == kea_type_);
+    EXPECT_TRUE(server_->kea_type(&kea) && kea == kea_type_);
+  }
+
+  // Get the expected limit on the number of records that can be sent for the
+  // cipher suite.
+  uint64_t record_limit() const {
+    switch (csinfo_.symCipher) {
+      case ssl_calg_rc4:
+      case ssl_calg_3des:
+        return 1ULL << 20;
+      case ssl_calg_aes:
+      case ssl_calg_aes_gcm:
+        return 0x5aULL << 28;
+      case ssl_calg_null:
+      case ssl_calg_chacha20:
+        return (1ULL << 48) - 1;
+      case ssl_calg_rc2:
+      case ssl_calg_des:
+      case ssl_calg_idea:
+      case ssl_calg_fortezza:
+      case ssl_calg_camellia:
+      case ssl_calg_seed:
+        break;
+    }
+    EXPECT_TRUE(false) << "No limit for " << csinfo_.cipherSuiteName;
+    return 1ULL < 48;
+  }
+
+  uint64_t last_safe_write() const {
+    uint64_t limit = record_limit() - 1;
+    if (version_ < SSL_LIBRARY_VERSION_TLS_1_1 &&
+        (csinfo_.symCipher == ssl_calg_3des ||
+         csinfo_.symCipher == ssl_calg_aes)) {
+      // 1/n-1 record splitting needs space for two records.
+      limit--;
+    }
+    return limit;
+  }
+
+ protected:
+  uint16_t cipher_suite_;
+  SSLAuthType auth_type_;
+  SSLKEAType kea_type_;
+  SSLNamedGroup group_;
+  SSLSignatureScheme signature_scheme_;
+  SSLCipherSuiteInfo csinfo_;
+};
+
+class TlsCipherSuiteTest
+    : public TlsCipherSuiteTestBase,
+      public ::testing::WithParamInterface<CipherSuiteProfile> {
+ public:
+  TlsCipherSuiteTest()
+      : TlsCipherSuiteTestBase(std::get<0>(GetParam()), std::get<1>(GetParam()),
+                               std::get<2>(GetParam()), std::get<3>(GetParam()),
+                               std::get<4>(GetParam())) {}
+
+ protected:
+  bool SkipIfCipherSuiteIsDSA() {
+    bool isDSA = csinfo_.authType == ssl_auth_dsa;
+    if (isDSA) {
+      std::cerr << "Skipping DSA suite: " << csinfo_.cipherSuiteName
+                << std::endl;
+    }
+    return isDSA;
+  }
+};
+
+TEST_P(TlsCipherSuiteTest, SingleCipherSuite) {
+  SetupCertificate();
+  EnableSingleCipher();
+  ConnectAndCheckCipherSuite();
+}
+
+TEST_P(TlsCipherSuiteTest, ResumeCipherSuite) {
+  if (SkipIfCipherSuiteIsDSA()) {
+    return;  // Tickets don't work with DSA (bug 1174677).
+  }
+
+  SetupCertificate();  // This is only needed once.
+
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  EnableSingleCipher();
+
+  ConnectAndCheckCipherSuite();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  EnableSingleCipher();
+  ExpectResumption(RESUME_TICKET);
+  ConnectAndCheckCipherSuite();
+}
+
+// This only works for stream ciphers because we modify the sequence number -
+// which is included explicitly in the DTLS record header - and that trips a
+// different error code.  Note that the message that the client sends would not
+// decrypt (the nonce/IV wouldn't match), but the record limit is hit before
+// attempting to decrypt a record.
+TEST_P(TlsCipherSuiteTest, ReadLimit) {
+  SetupCertificate();
+  EnableSingleCipher();
+  ConnectAndCheckCipherSuite();
+  EXPECT_EQ(SECSuccess,
+            SSLInt_AdvanceWriteSeqNum(client_->ssl_fd(), last_safe_write()));
+  EXPECT_EQ(SECSuccess,
+            SSLInt_AdvanceReadSeqNum(server_->ssl_fd(), last_safe_write()));
+
+  client_->SendData(10, 10);
+  server_->ReadBytes();  // This should be OK.
+
+  // The payload needs to be big enough to pass for encrypted.  In the extreme
+  // case (TLS 1.3), this means 1 for payload, 1 for content type and 16 for
+  // authentication tag.
+  static const uint8_t payload[18] = {6};
+  DataBuffer record;
+  uint64_t epoch = 0;
+  if (mode_ == DGRAM) {
+    epoch++;
+    if (version_ == SSL_LIBRARY_VERSION_TLS_1_3) {
+      epoch++;
+    }
+  }
+  TlsAgentTestBase::MakeRecord(mode_, kTlsApplicationDataType, version_,
+                               payload, sizeof(payload), &record,
+                               (epoch << 48) | record_limit());
+  server_->adapter()->PacketReceived(record);
+  server_->ExpectReadWriteError();
+  server_->ReadBytes();
+  EXPECT_EQ(SSL_ERROR_TOO_MANY_RECORDS, server_->error_code());
+}
+
+TEST_P(TlsCipherSuiteTest, WriteLimit) {
+  SetupCertificate();
+  EnableSingleCipher();
+  ConnectAndCheckCipherSuite();
+  EXPECT_EQ(SECSuccess,
+            SSLInt_AdvanceWriteSeqNum(client_->ssl_fd(), last_safe_write()));
+  client_->SendData(10, 10);
+  client_->ExpectReadWriteError();
+  client_->SendData(10, 10);
+  EXPECT_EQ(SSL_ERROR_TOO_MANY_RECORDS, client_->error_code());
+}
+
+// This awful macro makes the test instantiations easier to read.
+#define INSTANTIATE_CIPHER_TEST_P(name, modes, versions, groups, sigalgs, ...) \
+  static const uint16_t k##name##CiphersArr[] = {__VA_ARGS__};                 \
+  static const ::testing::internal::ParamGenerator<uint16_t>                   \
+      k##name##Ciphers = ::testing::ValuesIn(k##name##CiphersArr);             \
+  INSTANTIATE_TEST_CASE_P(                                                     \
+      CipherSuite##name, TlsCipherSuiteTest,                                   \
+      ::testing::Combine(TlsConnectTestBase::kTlsModes##modes,                 \
+                         TlsConnectTestBase::kTls##versions, k##name##Ciphers, \
+                         groups, sigalgs));
+
+static const auto kDummyNamedGroupParams = ::testing::Values(ssl_grp_none);
+static const auto kDummySignatureSchemesParams =
+    ::testing::Values(ssl_sig_none);
+
+#ifndef NSS_DISABLE_TLS_1_3
+static SSLSignatureScheme kSignatureSchemesParamsArr[] = {
+    ssl_sig_rsa_pkcs1_sha256,       ssl_sig_rsa_pkcs1_sha384,
+    ssl_sig_rsa_pkcs1_sha512,       ssl_sig_ecdsa_secp256r1_sha256,
+    ssl_sig_ecdsa_secp384r1_sha384, ssl_sig_rsa_pss_sha256,
+    ssl_sig_rsa_pss_sha384,         ssl_sig_rsa_pss_sha512,
+};
+#endif
+
+INSTANTIATE_CIPHER_TEST_P(RC4, Stream, V10ToV12, kDummyNamedGroupParams,
+                          kDummySignatureSchemesParams,
+                          TLS_RSA_WITH_RC4_128_SHA,
+                          TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
+                          TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
+                          TLS_ECDH_RSA_WITH_RC4_128_SHA,
+                          TLS_ECDHE_RSA_WITH_RC4_128_SHA);
+INSTANTIATE_CIPHER_TEST_P(AEAD12, All, V12, kDummyNamedGroupParams,
+                          kDummySignatureSchemesParams,
+                          TLS_RSA_WITH_AES_128_GCM_SHA256,
+                          TLS_RSA_WITH_AES_256_GCM_SHA384,
+                          TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,
+                          TLS_DHE_DSS_WITH_AES_256_GCM_SHA384,
+                          TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
+                          TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384);
+INSTANTIATE_CIPHER_TEST_P(AEAD, All, V12, kDummyNamedGroupParams,
+                          kDummySignatureSchemesParams,
+                          TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+                          TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+                          TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+                          TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+                          TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
+                          TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
+                          TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
+                          TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+                          TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256);
+INSTANTIATE_CIPHER_TEST_P(
+    CBC12, All, V12, kDummyNamedGroupParams, kDummySignatureSchemesParams,
+    TLS_DHE_RSA_WITH_AES_256_CBC_SHA256, TLS_RSA_WITH_AES_256_CBC_SHA256,
+    TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
+    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
+    TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,
+    TLS_DHE_DSS_WITH_AES_256_CBC_SHA256);
+INSTANTIATE_CIPHER_TEST_P(
+    CBCStream, Stream, V10ToV12, kDummyNamedGroupParams,
+    kDummySignatureSchemesParams, TLS_ECDH_ECDSA_WITH_NULL_SHA,
+    TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
+    TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_ECDSA_WITH_NULL_SHA,
+    TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+    TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDH_RSA_WITH_NULL_SHA,
+    TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
+    TLS_ECDH_RSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_NULL_SHA,
+    TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+    TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA);
+INSTANTIATE_CIPHER_TEST_P(
+    CBCDatagram, Datagram, V11V12, kDummyNamedGroupParams,
+    kDummySignatureSchemesParams, TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
+    TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
+    TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+    TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
+    TLS_ECDH_RSA_WITH_AES_128_CBC_SHA, TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
+    TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+    TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA);
+#ifndef NSS_DISABLE_TLS_1_3
+INSTANTIATE_CIPHER_TEST_P(TLS13, All, V13,
+                          ::testing::ValuesIn(kFasterDHEGroups),
+                          ::testing::ValuesIn(kSignatureSchemesParamsArr),
+                          TLS_AES_128_GCM_SHA256, TLS_CHACHA20_POLY1305_SHA256,
+                          TLS_AES_256_GCM_SHA384);
+INSTANTIATE_CIPHER_TEST_P(TLS13AllGroups, All, V13,
+                          ::testing::ValuesIn(kAllDHEGroups),
+                          ::testing::Values(ssl_sig_ecdsa_secp384r1_sha384),
+                          TLS_AES_256_GCM_SHA384);
+#endif
+
+// Fields are: version, cipher suite, bulk cipher name, secretKeySize
+struct SecStatusParams {
+  uint16_t version;
+  uint16_t cipher_suite;
+  std::string name;
+  int keySize;
+};
+
+inline std::ostream &operator<<(std::ostream &stream,
+                                const SecStatusParams &vals) {
+  SSLCipherSuiteInfo csinfo;
+  SECStatus rv =
+      SSL_GetCipherSuiteInfo(vals.cipher_suite, &csinfo, sizeof(csinfo));
+  if (rv != SECSuccess) {
+    return stream << "Error invoking SSL_GetCipherSuiteInfo()";
+  }
+
+  return stream << "TLS " << VersionString(vals.version) << ", "
+                << csinfo.cipherSuiteName << ", name = \"" << vals.name
+                << "\", key size = " << vals.keySize;
+}
+
+class SecurityStatusTest
+    : public TlsCipherSuiteTestBase,
+      public ::testing::WithParamInterface<SecStatusParams> {
+ public:
+  SecurityStatusTest()
+      : TlsCipherSuiteTestBase("TLS", GetParam().version,
+                               GetParam().cipher_suite, ssl_grp_none,
+                               ssl_sig_none) {}
+};
+
+// SSL_SecurityStatus produces fairly useless output when compared to
+// SSL_GetCipherSuiteInfo and SSL_GetChannelInfo, but we can't break it, so we
+// need to check it.
+TEST_P(SecurityStatusTest, CheckSecurityStatus) {
+  SetupCertificate();
+  EnableSingleCipher();
+  ConnectAndCheckCipherSuite();
+
+  int on;
+  char *cipher;
+  int keySize;
+  int secretKeySize;
+  char *issuer;
+  char *subject;
+  EXPECT_EQ(SECSuccess,
+            SSL_SecurityStatus(client_->ssl_fd(), &on, &cipher, &keySize,
+                               &secretKeySize, &issuer, &subject));
+  if (std::string(cipher) == "NULL") {
+    EXPECT_EQ(0, on);
+  } else {
+    EXPECT_NE(0, on);
+  }
+  EXPECT_EQ(GetParam().name, std::string(cipher));
+  // All the ciphers we support have secret key size == key size.
+  EXPECT_EQ(GetParam().keySize, keySize);
+  EXPECT_EQ(GetParam().keySize, secretKeySize);
+  EXPECT_LT(0U, strlen(issuer));
+  EXPECT_LT(0U, strlen(subject));
+
+  PORT_Free(cipher);
+  PORT_Free(issuer);
+  PORT_Free(subject);
+}
+
+static const SecStatusParams kSecStatusTestValuesArr[] = {
+    {SSL_LIBRARY_VERSION_TLS_1_0, TLS_ECDHE_RSA_WITH_NULL_SHA, "NULL", 0},
+    {SSL_LIBRARY_VERSION_TLS_1_0, TLS_RSA_WITH_RC4_128_SHA, "RC4", 128},
+    {SSL_LIBRARY_VERSION_TLS_1_0, TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+     "3DES-EDE-CBC", 168},
+    {SSL_LIBRARY_VERSION_TLS_1_0, TLS_RSA_WITH_AES_128_CBC_SHA, "AES-128", 128},
+    {SSL_LIBRARY_VERSION_TLS_1_2, TLS_RSA_WITH_AES_256_CBC_SHA256, "AES-256",
+     256},
+    {SSL_LIBRARY_VERSION_TLS_1_2, TLS_RSA_WITH_AES_128_GCM_SHA256,
+     "AES-128-GCM", 128},
+    {SSL_LIBRARY_VERSION_TLS_1_2, TLS_RSA_WITH_AES_256_GCM_SHA384,
+     "AES-256-GCM", 256},
+    {SSL_LIBRARY_VERSION_TLS_1_2, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+     "ChaCha20-Poly1305", 256}};
+INSTANTIATE_TEST_CASE_P(TestSecurityStatus, SecurityStatusTest,
+                        ::testing::ValuesIn(kSecStatusTestValuesArr));
+
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_damage_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_damage_unittest.cc
new file mode 100644
index 0000000000..9dadcbdf6e
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_damage_unittest.cc
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_F(TlsConnectTest, DamageSecretHandleClientFinished) {
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->StartConnect();
+  client_->StartConnect();
+  client_->Handshake();
+  server_->Handshake();
+  std::cerr << "Damaging HS secret\n";
+  SSLInt_DamageClientHsTrafficSecret(server_->ssl_fd());
+  client_->Handshake();
+  server_->Handshake();
+  // The client thinks it has connected.
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, client_->state());
+  server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+  client_->Handshake();
+  client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+}
+
+TEST_F(TlsConnectTest, DamageSecretHandleServerFinished) {
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetPacketFilter(new AfterRecordN(
+      server_, client_,
+      0,  // ServerHello.
+      [this]() { SSLInt_DamageServerHsTrafficSecret(client_->ssl_fd()); }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+  server_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
+}
+
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_dhe_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_dhe_unittest.cc
new file mode 100644
index 0000000000..82d55586bf
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_dhe_unittest.cc
@@ -0,0 +1,609 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include <set>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectGeneric, ConnectDhe) {
+  EnableOnlyDheCiphers();
+  Connect();
+  CheckKeys(ssl_kea_dh, ssl_grp_ffdhe_2048, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+TEST_P(TlsConnectTls13, SharesForBothEcdheAndDhe) {
+  EnsureTlsSetup();
+  client_->ConfigNamedGroups(kAllDHEGroups);
+
+  auto groups_capture = new TlsExtensionCapture(ssl_supported_groups_xtn);
+  auto shares_capture = new TlsExtensionCapture(ssl_tls13_key_share_xtn);
+  std::vector<PacketFilter*> captures;
+  captures.push_back(groups_capture);
+  captures.push_back(shares_capture);
+  client_->SetPacketFilter(new ChainedPacketFilter(captures));
+
+  Connect();
+
+  CheckKeys();
+
+  bool ec, dh;
+  auto track_group_type = [&ec, &dh](SSLNamedGroup group) {
+    if ((group & 0xff00U) == 0x100U) {
+      dh = true;
+    } else {
+      ec = true;
+    }
+  };
+  CheckGroups(groups_capture->extension(), track_group_type);
+  CheckShares(shares_capture->extension(), track_group_type);
+  EXPECT_TRUE(ec) << "Should include an EC group and share";
+  EXPECT_TRUE(dh) << "Should include an FFDHE group and share";
+}
+
+TEST_P(TlsConnectGeneric, ConnectFfdheClient) {
+  EnableOnlyDheCiphers();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  auto groups_capture = new TlsExtensionCapture(ssl_supported_groups_xtn);
+  auto shares_capture = new TlsExtensionCapture(ssl_tls13_key_share_xtn);
+  std::vector<PacketFilter*> captures;
+  captures.push_back(groups_capture);
+  captures.push_back(shares_capture);
+  client_->SetPacketFilter(new ChainedPacketFilter(captures));
+
+  Connect();
+
+  CheckKeys(ssl_kea_dh, ssl_auth_rsa_sign);
+  auto is_ffdhe = [](SSLNamedGroup group) {
+    // The group has to be in this range.
+    EXPECT_LE(ssl_grp_ffdhe_2048, group);
+    EXPECT_GE(ssl_grp_ffdhe_8192, group);
+  };
+  CheckGroups(groups_capture->extension(), is_ffdhe);
+  if (version_ == SSL_LIBRARY_VERSION_TLS_1_3) {
+    CheckShares(shares_capture->extension(), is_ffdhe);
+  } else {
+    EXPECT_EQ(0U, shares_capture->extension().len());
+  }
+}
+
+// Requiring the FFDHE extension on the server alone means that clients won't be
+// able to connect using a DHE suite.  They should still connect in TLS 1.3,
+// because the client automatically sends the supported groups extension.
+TEST_P(TlsConnectGenericPre13, ConnectFfdheServer) {
+  EnableOnlyDheCiphers();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(server_->ssl_fd(),
+                                      SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    Connect();
+    CheckKeys(ssl_kea_dh, ssl_auth_rsa_sign);
+  } else {
+    ConnectExpectFail();
+    client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+    server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  }
+}
+
+class TlsDheServerKeyExchangeDamager : public TlsHandshakeFilter {
+ public:
+  TlsDheServerKeyExchangeDamager() {}
+  virtual PacketFilter::Action FilterHandshake(
+      const TlsHandshakeFilter::HandshakeHeader& header,
+      const DataBuffer& input, DataBuffer* output) {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    // Damage the first octet of dh_p.  Anything other than the known prime will
+    // be rejected as "weak" when we have SSL_REQUIRE_DH_NAMED_GROUPS enabled.
+    *output = input;
+    output->data()[3] ^= 73;
+    return CHANGE;
+  }
+};
+
+// Changing the prime in the server's key share results in an error.  This will
+// invalidate the signature over the ServerKeyShare. That's ok, NSS won't check
+// the signature until everything else has been checked.
+TEST_P(TlsConnectGenericPre13, DamageServerKeyShare) {
+  EnableOnlyDheCiphers();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  server_->SetPacketFilter(new TlsDheServerKeyExchangeDamager());
+
+  ConnectExpectFail();
+
+  client_->CheckErrorCode(SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY);
+  server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+}
+
+class TlsDheSkeChangeY : public TlsHandshakeFilter {
+ public:
+  enum ChangeYTo {
+    kYZero,
+    kYOne,
+    kYPMinusOne,
+    kYGreaterThanP,
+    kYTooLarge,
+    kYZeroPad
+  };
+
+  TlsDheSkeChangeY(ChangeYTo change) : change_Y_(change) {}
+
+ protected:
+  void ChangeY(const DataBuffer& input, DataBuffer* output, size_t offset,
+               const DataBuffer& prime) {
+    static const uint8_t kExtraZero = 0;
+    static const uint8_t kTooLargeExtra = 1;
+
+    uint32_t dh_Ys_len;
+    EXPECT_TRUE(input.Read(offset, 2, &dh_Ys_len));
+    EXPECT_LT(offset + dh_Ys_len, input.len());
+    offset += 2;
+
+    // This isn't generally true, but our code pads.
+    EXPECT_EQ(prime.len(), dh_Ys_len)
+        << "Length of dh_Ys must equal length of dh_p";
+
+    *output = input;
+    switch (change_Y_) {
+      case kYZero:
+        memset(output->data() + offset, 0, prime.len());
+        break;
+
+      case kYOne:
+        memset(output->data() + offset, 0, prime.len() - 1);
+        output->Write(offset + prime.len() - 1, 1U, 1);
+        break;
+
+      case kYPMinusOne:
+        output->Write(offset, prime);
+        EXPECT_TRUE(output->data()[offset + prime.len() - 1] & 0x01)
+            << "P must at least be odd";
+        --output->data()[offset + prime.len() - 1];
+        break;
+
+      case kYGreaterThanP:
+        // Set the first 32 octets of Y to 0xff, except the first which we set
+        // to p[0].  This will make Y > p.  That is, unless p is Mersenne, or
+        // improbably large (but still the same bit length).  We currently only
+        // use a fixed prime that isn't a problem for this code.
+        EXPECT_LT(0, prime.data()[0]) << "dh_p should not be zero-padded";
+        offset = output->Write(offset, prime.data()[0], 1);
+        memset(output->data() + offset, 0xff, 31);
+        break;
+
+      case kYTooLarge:
+        // Increase the dh_Ys length.
+        output->Write(offset - 2, prime.len() + sizeof(kTooLargeExtra), 2);
+        // Then insert the octet.
+        output->Splice(&kTooLargeExtra, sizeof(kTooLargeExtra), offset);
+        break;
+
+      case kYZeroPad:
+        output->Write(offset - 2, prime.len() + sizeof(kExtraZero), 2);
+        output->Splice(&kExtraZero, sizeof(kExtraZero), offset);
+        break;
+    }
+  }
+
+ private:
+  ChangeYTo change_Y_;
+};
+
+class TlsDheSkeChangeYServer : public TlsDheSkeChangeY {
+ public:
+  TlsDheSkeChangeYServer(ChangeYTo change, bool modify)
+      : TlsDheSkeChangeY(change), modify_(modify), p_() {}
+
+  const DataBuffer& prime() const { return p_; }
+
+ protected:
+  virtual PacketFilter::Action FilterHandshake(
+      const TlsHandshakeFilter::HandshakeHeader& header,
+      const DataBuffer& input, DataBuffer* output) override {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    size_t offset = 2;
+    // Read dh_p
+    uint32_t dh_len = 0;
+    EXPECT_TRUE(input.Read(0, 2, &dh_len));
+    EXPECT_GT(input.len(), offset + dh_len);
+    p_.Assign(input.data() + offset, dh_len);
+    offset += dh_len;
+
+    // Skip dh_g to find dh_Ys
+    EXPECT_TRUE(input.Read(offset, 2, &dh_len));
+    offset += 2 + dh_len;
+
+    if (modify_) {
+      ChangeY(input, output, offset, p_);
+      return CHANGE;
+    }
+    return KEEP;
+  }
+
+ private:
+  bool modify_;
+  DataBuffer p_;
+};
+
+class TlsDheSkeChangeYClient : public TlsDheSkeChangeY {
+ public:
+  TlsDheSkeChangeYClient(ChangeYTo change,
+                         const TlsDheSkeChangeYServer* server_filter)
+      : TlsDheSkeChangeY(change), server_filter_(server_filter) {}
+
+ protected:
+  virtual PacketFilter::Action FilterHandshake(
+      const TlsHandshakeFilter::HandshakeHeader& header,
+      const DataBuffer& input, DataBuffer* output) override {
+    if (header.handshake_type() != kTlsHandshakeClientKeyExchange) {
+      return KEEP;
+    }
+
+    ChangeY(input, output, 0, server_filter_->prime());
+    return CHANGE;
+  }
+
+ private:
+  const TlsDheSkeChangeYServer* server_filter_;
+};
+
+/* This matrix includes: mode (stream/datagram), TLS version, what change to
+ * make to dh_Ys, whether the client will be configured to require DH named
+ * groups.  Test all combinations. */
+typedef std::tuple<std::string, uint16_t, TlsDheSkeChangeY::ChangeYTo, bool>
+    DamageDHYProfile;
+class TlsDamageDHYTest
+    : public TlsConnectTestBase,
+      public ::testing::WithParamInterface<DamageDHYProfile> {
+ public:
+  TlsDamageDHYTest()
+      : TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {}
+};
+
+TEST_P(TlsDamageDHYTest, DamageServerY) {
+  EnableOnlyDheCiphers();
+  if (std::get<3>(GetParam())) {
+    EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                        SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  }
+  TlsDheSkeChangeY::ChangeYTo change = std::get<2>(GetParam());
+  server_->SetPacketFilter(new TlsDheSkeChangeYServer(change, true));
+
+  ConnectExpectFail();
+  if (change == TlsDheSkeChangeY::kYZeroPad) {
+    // Zero padding Y only manifests in a signature failure.
+    // In TLS 1.0 and 1.1, the client reports a device error.
+    if (version_ < SSL_LIBRARY_VERSION_TLS_1_2) {
+      client_->CheckErrorCode(SEC_ERROR_PKCS11_DEVICE_ERROR);
+    } else {
+      client_->CheckErrorCode(SEC_ERROR_BAD_SIGNATURE);
+    }
+    server_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+  } else {
+    client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_DHE_KEY_SHARE);
+    server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  }
+}
+
+TEST_P(TlsDamageDHYTest, DamageClientY) {
+  EnableOnlyDheCiphers();
+  if (std::get<3>(GetParam())) {
+    EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                        SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  }
+  // The filter on the server is required to capture the prime.
+  TlsDheSkeChangeYServer* server_filter =
+      new TlsDheSkeChangeYServer(TlsDheSkeChangeY::kYZero, false);
+  server_->SetPacketFilter(server_filter);
+
+  // The client filter does the damage.
+  TlsDheSkeChangeY::ChangeYTo change = std::get<2>(GetParam());
+  client_->SetPacketFilter(new TlsDheSkeChangeYClient(change, server_filter));
+
+  ConnectExpectFail();
+  if (change == TlsDheSkeChangeY::kYZeroPad) {
+    // Zero padding Y only manifests in a finished error.
+    client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+    server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+  } else {
+    client_->CheckErrorCode(SSL_ERROR_HANDSHAKE_FAILURE_ALERT);
+    server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_DHE_KEY_SHARE);
+  }
+}
+
+static const TlsDheSkeChangeY::ChangeYTo kAllYArr[] = {
+    TlsDheSkeChangeY::kYZero,      TlsDheSkeChangeY::kYOne,
+    TlsDheSkeChangeY::kYPMinusOne, TlsDheSkeChangeY::kYGreaterThanP,
+    TlsDheSkeChangeY::kYTooLarge,  TlsDheSkeChangeY::kYZeroPad};
+static ::testing::internal::ParamGenerator<TlsDheSkeChangeY::ChangeYTo> kAllY =
+    ::testing::ValuesIn(kAllYArr);
+static const bool kTrueFalseArr[] = {true, false};
+static ::testing::internal::ParamGenerator<bool> kTrueFalse =
+    ::testing::ValuesIn(kTrueFalseArr);
+
+INSTANTIATE_TEST_CASE_P(DamageYStream, TlsDamageDHYTest,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsV10ToV12,
+                                           kAllY, kTrueFalse));
+INSTANTIATE_TEST_CASE_P(
+    DamageYDatagram, TlsDamageDHYTest,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesDatagram,
+                       TlsConnectTestBase::kTlsV11V12, kAllY, kTrueFalse));
+
+class TlsDheSkeMakePEven : public TlsHandshakeFilter {
+ public:
+  virtual PacketFilter::Action FilterHandshake(
+      const TlsHandshakeFilter::HandshakeHeader& header,
+      const DataBuffer& input, DataBuffer* output) {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    // Find the end of dh_p
+    uint32_t dh_len = 0;
+    EXPECT_TRUE(input.Read(0, 2, &dh_len));
+    EXPECT_GT(input.len(), 2 + dh_len) << "enough space for dh_p";
+    size_t offset = 2 + dh_len - 1;
+    EXPECT_TRUE((input.data()[offset] & 0x01) == 0x01) << "p should be odd";
+
+    *output = input;
+    output->data()[offset] &= 0xfe;
+
+    return CHANGE;
+  }
+};
+
+// Even without requiring named groups, an even value for p is bad news.
+TEST_P(TlsConnectGenericPre13, MakeDhePEven) {
+  EnableOnlyDheCiphers();
+  server_->SetPacketFilter(new TlsDheSkeMakePEven());
+
+  ConnectExpectFail();
+
+  client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_DHE_KEY_SHARE);
+  server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+}
+
+class TlsDheSkeZeroPadP : public TlsHandshakeFilter {
+ public:
+  virtual PacketFilter::Action FilterHandshake(
+      const TlsHandshakeFilter::HandshakeHeader& header,
+      const DataBuffer& input, DataBuffer* output) {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    *output = input;
+    uint32_t dh_len = 0;
+    EXPECT_TRUE(input.Read(0, 2, &dh_len));
+    static const uint8_t kZeroPad = 0;
+    output->Write(0, dh_len + sizeof(kZeroPad), 2);  // increment the length
+    output->Splice(&kZeroPad, sizeof(kZeroPad), 2);  // insert a zero
+
+    return CHANGE;
+  }
+};
+
+// Zero padding only causes signature failure.
+TEST_P(TlsConnectGenericPre13, PadDheP) {
+  EnableOnlyDheCiphers();
+  server_->SetPacketFilter(new TlsDheSkeZeroPadP());
+
+  ConnectExpectFail();
+
+  // In TLS 1.0 and 1.1, the client reports a device error.
+  if (version_ < SSL_LIBRARY_VERSION_TLS_1_2) {
+    client_->CheckErrorCode(SEC_ERROR_PKCS11_DEVICE_ERROR);
+  } else {
+    client_->CheckErrorCode(SEC_ERROR_BAD_SIGNATURE);
+  }
+  server_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+}
+
+// The server should not pick the weak DH group if the client includes FFDHE
+// named groups in the supported_groups extension. The server then picks a
+// commonly-supported named DH group and this connects.
+//
+// Note: This test case can take ages to generate the weak DH key.
+TEST_P(TlsConnectGenericPre13, WeakDHGroup) {
+  EnableOnlyDheCiphers();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  EXPECT_EQ(SECSuccess,
+            SSL_EnableWeakDHEPrimeGroup(server_->ssl_fd(), PR_TRUE));
+
+  Connect();
+}
+
+TEST_P(TlsConnectGeneric, Ffdhe3072) {
+  EnableOnlyDheCiphers();
+  static const std::vector<SSLNamedGroup> groups = {ssl_grp_ffdhe_3072};
+  client_->ConfigNamedGroups(groups);
+
+  Connect();
+}
+
+// Even though the client doesn't have DHE groups enabled the server assumes it
+// does. Because the client doesn't require named groups it accepts FF3072 as
+// custom group.
+TEST_P(TlsConnectGenericPre13, NamedGroupMismatchPre13) {
+  EnableOnlyDheCiphers();
+  static const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ffdhe_3072};
+  static const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_secp256r1};
+  server_->ConfigNamedGroups(server_groups);
+  client_->ConfigNamedGroups(client_groups);
+
+  Connect();
+  CheckKeys(ssl_kea_dh, ssl_grp_ffdhe_custom, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+// Same test but for TLS 1.3. This has to fail.
+TEST_P(TlsConnectTls13, NamedGroupMismatch13) {
+  EnableOnlyDheCiphers();
+  static const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ffdhe_3072};
+  static const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_secp256r1};
+  server_->ConfigNamedGroups(server_groups);
+  client_->ConfigNamedGroups(client_groups);
+
+  ConnectExpectFail();
+  server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+// Even though the client doesn't have DHE groups enabled the server assumes it
+// does. The client requires named groups and thus does not accept FF3072 as
+// custom group in contrast to the previous test.
+TEST_P(TlsConnectGenericPre13, RequireNamedGroupsMismatchPre13) {
+  EnableOnlyDheCiphers();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  static const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ffdhe_3072};
+  static const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_secp256r1,
+                                                           ssl_grp_ffdhe_2048};
+  server_->ConfigNamedGroups(server_groups);
+  client_->ConfigNamedGroups(client_groups);
+
+  ConnectExpectFail();
+  server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+TEST_P(TlsConnectGenericPre13, PreferredFfdhe) {
+  EnableOnlyDheCiphers();
+  static const SSLDHEGroupType groups[] = {ssl_ff_dhe_3072_group,
+                                           ssl_ff_dhe_2048_group};
+  EXPECT_EQ(SECSuccess, SSL_DHEGroupPrefSet(server_->ssl_fd(), groups,
+                                            PR_ARRAY_SIZE(groups)));
+
+  Connect();
+  client_->CheckKEA(ssl_kea_dh, ssl_grp_ffdhe_3072, 3072);
+  server_->CheckKEA(ssl_kea_dh, ssl_grp_ffdhe_3072, 3072);
+  client_->CheckAuthType(ssl_auth_rsa_sign, ssl_sig_rsa_pss_sha256);
+  server_->CheckAuthType(ssl_auth_rsa_sign, ssl_sig_rsa_pss_sha256);
+}
+
+TEST_P(TlsConnectGenericPre13, MismatchDHE) {
+  EnableOnlyDheCiphers();
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(client_->ssl_fd(),
+                                      SSL_REQUIRE_DH_NAMED_GROUPS, PR_TRUE));
+  static const SSLDHEGroupType serverGroups[] = {ssl_ff_dhe_3072_group};
+  EXPECT_EQ(SECSuccess, SSL_DHEGroupPrefSet(server_->ssl_fd(), serverGroups,
+                                            PR_ARRAY_SIZE(serverGroups)));
+  static const SSLDHEGroupType clientGroups[] = {ssl_ff_dhe_2048_group};
+  EXPECT_EQ(SECSuccess, SSL_DHEGroupPrefSet(client_->ssl_fd(), clientGroups,
+                                            PR_ARRAY_SIZE(clientGroups)));
+
+  ConnectExpectFail();
+  server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+TEST_P(TlsConnectTls13, ResumeFfdhe) {
+  EnableOnlyDheCiphers();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys(ssl_kea_dh, ssl_auth_rsa_sign);
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  EnableOnlyDheCiphers();
+  TlsExtensionCapture* clientCapture =
+      new TlsExtensionCapture(ssl_tls13_pre_shared_key_xtn);
+  client_->SetPacketFilter(clientCapture);
+  TlsExtensionCapture* serverCapture =
+      new TlsExtensionCapture(ssl_tls13_pre_shared_key_xtn);
+  server_->SetPacketFilter(serverCapture);
+  ExpectResumption(RESUME_TICKET);
+  Connect();
+  CheckKeys(ssl_kea_dh, ssl_grp_ffdhe_2048, ssl_auth_rsa_sign, ssl_sig_none);
+  ASSERT_LT(0UL, clientCapture->extension().len());
+  ASSERT_LT(0UL, serverCapture->extension().len());
+}
+
+class TlsDheSkeChangeSignature : public TlsHandshakeFilter {
+ public:
+  TlsDheSkeChangeSignature(uint16_t version, const uint8_t* data, size_t len)
+      : version_(version), data_(data), len_(len) {}
+
+ protected:
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    TlsParser parser(input);
+    EXPECT_TRUE(parser.SkipVariable(2));  // dh_p
+    EXPECT_TRUE(parser.SkipVariable(2));  // dh_g
+    EXPECT_TRUE(parser.SkipVariable(2));  // dh_Ys
+
+    // Copy DH params to output.
+    size_t offset = output->Write(0, input.data(), parser.consumed());
+
+    if (version_ == SSL_LIBRARY_VERSION_TLS_1_2) {
+      // Write signature algorithm.
+      offset = output->Write(offset, ssl_sig_dsa_sha256, 2);
+    }
+
+    // Write new signature.
+    offset = output->Write(offset, len_, 2);
+    offset = output->Write(offset, data_, len_);
+
+    return CHANGE;
+  }
+
+ private:
+  uint16_t version_;
+  const uint8_t* data_;
+  size_t len_;
+};
+
+TEST_P(TlsConnectGenericPre13, InvalidDERSignatureFfdhe) {
+  const uint8_t kBogusDheSignature[] = {
+      0x30, 0x69, 0x3c, 0x02, 0x1c, 0x7d, 0x0b, 0x2f, 0x64, 0x00, 0x27,
+      0xae, 0xcf, 0x1e, 0x28, 0x08, 0x6a, 0x7f, 0xb1, 0xbd, 0x78, 0xb5,
+      0x3b, 0x8c, 0x8f, 0x59, 0xed, 0x8f, 0xee, 0x78, 0xeb, 0x2c, 0xe9,
+      0x02, 0x1c, 0x6d, 0x7f, 0x3c, 0x0f, 0xf4, 0x44, 0x35, 0x0b, 0xb2,
+      0x6d, 0xdc, 0xb8, 0x21, 0x87, 0xdd, 0x0d, 0xb9, 0x46, 0x09, 0x3e,
+      0xef, 0x81, 0x5b, 0x37, 0x09, 0x39, 0xeb};
+
+  Reset(TlsAgent::kServerDsa);
+
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ffdhe_2048};
+  client_->ConfigNamedGroups(client_groups);
+
+  server_->SetPacketFilter(new TlsDheSkeChangeSignature(
+      version_, kBogusDheSignature, sizeof(kBogusDheSignature)));
+
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_drop_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_drop_unittest.cc
new file mode 100644
index 0000000000..89ca28e973
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_drop_unittest.cc
@@ -0,0 +1,133 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secerr.h"
+#include "ssl.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectDatagram, DropClientFirstFlightOnce) {
+  client_->SetPacketFilter(new SelectiveDropFilter(0x1));
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectDatagram, DropServerFirstFlightOnce) {
+  server_->SetPacketFilter(new SelectiveDropFilter(0x1));
+  Connect();
+  SendReceive();
+}
+
+// This drops the first transmission from both the client and server of all
+// flights that they send.  Note: In DTLS 1.3, the shorter handshake means that
+// this will also drop some application data, so we can't call SendReceive().
+TEST_P(TlsConnectDatagram, DropAllFirstTransmissions) {
+  client_->SetPacketFilter(new SelectiveDropFilter(0x15));
+  server_->SetPacketFilter(new SelectiveDropFilter(0x5));
+  Connect();
+}
+
+// This drops the server's first flight three times.
+TEST_P(TlsConnectDatagram, DropServerFirstFlightThrice) {
+  server_->SetPacketFilter(new SelectiveDropFilter(0x7));
+  Connect();
+}
+
+// This drops the client's second flight once
+TEST_P(TlsConnectDatagram, DropClientSecondFlightOnce) {
+  client_->SetPacketFilter(new SelectiveDropFilter(0x2));
+  Connect();
+}
+
+// This drops the client's second flight three times.
+TEST_P(TlsConnectDatagram, DropClientSecondFlightThrice) {
+  client_->SetPacketFilter(new SelectiveDropFilter(0xe));
+  Connect();
+}
+
+// This drops the server's second flight three times.
+TEST_P(TlsConnectDatagram, DropServerSecondFlightThrice) {
+  server_->SetPacketFilter(new SelectiveDropFilter(0xe));
+  Connect();
+}
+
+static void GetCipherAndLimit(uint16_t version, uint16_t* cipher,
+                              uint64_t* limit = nullptr) {
+  uint64_t l;
+  if (!limit) limit = &l;
+
+  if (version < SSL_LIBRARY_VERSION_TLS_1_2) {
+    *cipher = TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA;
+    *limit = 0x5aULL << 28;
+  } else if (version == SSL_LIBRARY_VERSION_TLS_1_2) {
+    *cipher = TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256;
+    *limit = (1ULL << 48) - 1;
+  } else {
+    *cipher = TLS_CHACHA20_POLY1305_SHA256;
+    *limit = (1ULL << 48) - 1;
+  }
+}
+
+// This simulates a huge number of drops on one side.
+TEST_P(TlsConnectDatagram, MissLotsOfPackets) {
+  uint16_t cipher;
+  uint64_t limit;
+
+  GetCipherAndLimit(version_, &cipher, &limit);
+
+  EnsureTlsSetup();
+  server_->EnableSingleCipher(cipher);
+  Connect();
+
+  // Note that the limit for ChaCha is 2^48-1.
+  EXPECT_EQ(SECSuccess,
+            SSLInt_AdvanceWriteSeqNum(client_->ssl_fd(), limit - 10));
+  SendReceive();
+}
+
+class TlsConnectDatagram12Plus : public TlsConnectDatagram {
+ public:
+  TlsConnectDatagram12Plus() : TlsConnectDatagram() {}
+};
+
+// This simulates missing a window's worth of packets.
+TEST_P(TlsConnectDatagram12Plus, MissAWindow) {
+  EnsureTlsSetup();
+  uint16_t cipher;
+  GetCipherAndLimit(version_, &cipher);
+  server_->EnableSingleCipher(cipher);
+  Connect();
+
+  EXPECT_EQ(SECSuccess, SSLInt_AdvanceWriteSeqByAWindow(client_->ssl_fd(), 0));
+  SendReceive();
+}
+
+TEST_P(TlsConnectDatagram12Plus, MissAWindowAndOne) {
+  EnsureTlsSetup();
+  uint16_t cipher;
+  GetCipherAndLimit(version_, &cipher);
+  server_->EnableSingleCipher(cipher);
+  Connect();
+
+  EXPECT_EQ(SECSuccess, SSLInt_AdvanceWriteSeqByAWindow(client_->ssl_fd(), 1));
+  SendReceive();
+}
+
+INSTANTIATE_TEST_CASE_P(Datagram12Plus, TlsConnectDatagram12Plus,
+                        TlsConnectTestBase::kTlsV12Plus);
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_ecdh_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_ecdh_unittest.cc
new file mode 100644
index 0000000000..79b7736e45
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_ecdh_unittest.cc
@@ -0,0 +1,584 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectGenericPre13, ConnectEcdh) {
+  SetExpectedVersion(std::get<1>(GetParam()));
+  Reset(TlsAgent::kServerEcdhEcdsa);
+  DisableAllCiphers();
+  EnableSomeEcdhCiphers();
+
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_ecdh_ecdsa,
+            ssl_sig_none);
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectEcdhWithoutDisablingSuites) {
+  SetExpectedVersion(std::get<1>(GetParam()));
+  Reset(TlsAgent::kServerEcdhEcdsa);
+  EnableSomeEcdhCiphers();
+
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_ecdh_ecdsa,
+            ssl_sig_none);
+}
+
+TEST_P(TlsConnectGeneric, ConnectEcdhe) {
+  Connect();
+  CheckKeys();
+}
+
+// If we pick a 256-bit cipher suite and use a P-384 certificate, the server
+// should choose P-384 for key exchange too.  Only valid for TLS == 1.2 because
+// we don't have 256-bit ciphers before then and 1.3 doesn't try to couple
+// DHE size to symmetric size.
+TEST_P(TlsConnectTls12, ConnectEcdheP384) {
+  Reset(TlsAgent::kServerEcdsa384);
+  ConnectWithCipherSuite(TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256);
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_ecdsa,
+            ssl_sig_ecdsa_secp256r1_sha256);
+}
+
+TEST_P(TlsConnectGeneric, ConnectEcdheP384Client) {
+  EnsureTlsSetup();
+  const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_secp384r1,
+                                             ssl_grp_ffdhe_2048};
+  client_->ConfigNamedGroups(groups);
+  server_->ConfigNamedGroups(groups);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+// This causes a HelloRetryRequest in TLS 1.3.  Earlier versions don't care.
+TEST_P(TlsConnectGeneric, ConnectEcdheP384Server) {
+  EnsureTlsSetup();
+  auto hrr_capture =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeHelloRetryRequest);
+  server_->SetPacketFilter(hrr_capture);
+  const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_secp384r1};
+  server_->ConfigNamedGroups(groups);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  EXPECT_EQ(version_ == SSL_LIBRARY_VERSION_TLS_1_3,
+            hrr_capture->buffer().len() != 0);
+}
+
+// This enables only P-256 on the client and disables it on the server.
+// This test will fail when we add other groups that identify as ECDHE.
+TEST_P(TlsConnectGeneric, ConnectEcdheGroupMismatch) {
+  EnsureTlsSetup();
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ffdhe_2048};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ffdhe_2048};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+  CheckKeys(ssl_kea_dh, ssl_auth_rsa_sign);
+}
+
+TEST_P(TlsKeyExchangeTest, P384Priority) {
+  // P256, P384 and P521 are enabled. Both prefer P384.
+  const std::vector<SSLNamedGroup> groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_secp256r1, ssl_grp_ec_secp521r1};
+  EnsureKeyShareSetup();
+  ConfigNamedGroups(groups);
+  client_->DisableAllCiphers();
+  client_->EnableCiphersByKeyExchange(ssl_kea_ecdh);
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+
+  std::vector<SSLNamedGroup> shares = {ssl_grp_ec_secp384r1};
+  CheckKEXDetails(groups, shares);
+}
+
+TEST_P(TlsKeyExchangeTest, DuplicateGroupConfig) {
+  const std::vector<SSLNamedGroup> groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_secp384r1, ssl_grp_ec_secp384r1,
+      ssl_grp_ec_secp256r1, ssl_grp_ec_secp256r1};
+  EnsureKeyShareSetup();
+  ConfigNamedGroups(groups);
+  client_->DisableAllCiphers();
+  client_->EnableCiphersByKeyExchange(ssl_kea_ecdh);
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+
+  std::vector<SSLNamedGroup> shares = {ssl_grp_ec_secp384r1};
+  std::vector<SSLNamedGroup> expectedGroups = {ssl_grp_ec_secp384r1,
+                                               ssl_grp_ec_secp256r1};
+  CheckKEXDetails(expectedGroups, shares);
+}
+
+TEST_P(TlsKeyExchangeTest, P384PriorityDHEnabled) {
+  // P256, P384,  P521, and FFDHE2048 are enabled. Both prefer P384.
+  const std::vector<SSLNamedGroup> groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ffdhe_2048, ssl_grp_ec_secp256r1,
+      ssl_grp_ec_secp521r1};
+  EnsureKeyShareSetup();
+  ConfigNamedGroups(groups);
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    std::vector<SSLNamedGroup> shares = {ssl_grp_ec_secp384r1};
+    CheckKEXDetails(groups, shares);
+  } else {
+    std::vector<SSLNamedGroup> oldtlsgroups = {
+        ssl_grp_ec_secp384r1, ssl_grp_ec_secp256r1, ssl_grp_ec_secp521r1};
+    CheckKEXDetails(oldtlsgroups, std::vector<SSLNamedGroup>());
+  }
+}
+
+TEST_P(TlsConnectGenericPre13, P384PriorityOnServer) {
+  EnsureTlsSetup();
+  client_->DisableAllCiphers();
+  client_->EnableCiphersByKeyExchange(ssl_kea_ecdh);
+
+  // The server prefers P384. It has to win.
+  const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_secp256r1, ssl_grp_ec_secp521r1};
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+TEST_P(TlsConnectGenericPre13, P384PriorityFromModelSocket) {
+  EnsureModelSockets();
+
+  /* Both prefer P384, set on the model socket. */
+  const std::vector<SSLNamedGroup> groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_secp256r1, ssl_grp_ec_secp521r1,
+      ssl_grp_ffdhe_2048};
+  client_model_->ConfigNamedGroups(groups);
+  server_model_->ConfigNamedGroups(groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp384r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+class TlsKeyExchangeGroupCapture : public TlsHandshakeFilter {
+ public:
+  TlsKeyExchangeGroupCapture() : group_(ssl_grp_none) {}
+
+  SSLNamedGroup group() const { return group_; }
+
+ protected:
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader &header,
+                                               const DataBuffer &input,
+                                               DataBuffer *output) {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    uint32_t value = 0;
+    EXPECT_TRUE(input.Read(0, 1, &value));
+    EXPECT_EQ(3U, value) << "curve type has to be 3";
+
+    EXPECT_TRUE(input.Read(1, 2, &value));
+    group_ = static_cast<SSLNamedGroup>(value);
+
+    return KEEP;
+  }
+
+ private:
+  SSLNamedGroup group_;
+};
+
+// If we strip the client's supported groups extension, the server should assume
+// P-256 is supported by the client (<= 1.2 only).
+TEST_P(TlsConnectGenericPre13, DropSupportedGroupExtensionP256) {
+  EnsureTlsSetup();
+  client_->SetPacketFilter(new TlsExtensionDropper(ssl_supported_groups_xtn));
+  auto group_capture = new TlsKeyExchangeGroupCapture();
+  server_->SetPacketFilter(group_capture);
+
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+
+  EXPECT_EQ(ssl_grp_ec_secp256r1, group_capture->group());
+}
+
+// Supported groups is mandatory in TLS 1.3.
+TEST_P(TlsConnectTls13, DropSupportedGroupExtension) {
+  EnsureTlsSetup();
+  client_->SetPacketFilter(new TlsExtensionDropper(ssl_supported_groups_xtn));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_MISSING_EXTENSION_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_MISSING_SUPPORTED_GROUPS_EXTENSION);
+}
+
+// If we only have a lame group, we fall back to static RSA.
+TEST_P(TlsConnectGenericPre13, UseLameGroup) {
+  const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_secp192r1};
+  client_->ConfigNamedGroups(groups);
+  server_->ConfigNamedGroups(groups);
+  Connect();
+  CheckKeys(ssl_kea_rsa, ssl_grp_none, ssl_auth_rsa_decrypt, ssl_sig_none);
+}
+
+// In TLS 1.3, we can't generate the ClientHello.
+TEST_P(TlsConnectTls13, UseLameGroup) {
+  const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_sect283k1};
+  client_->ConfigNamedGroups(groups);
+  server_->ConfigNamedGroups(groups);
+  client_->StartConnect();
+  client_->Handshake();
+  client_->CheckErrorCode(SSL_ERROR_NO_CIPHERS_SUPPORTED);
+}
+
+TEST_P(TlsConnectStreamPre13, ConfiguredGroupsRenegotiate) {
+  EnsureTlsSetup();
+  client_->DisableAllCiphers();
+  client_->EnableCiphersByKeyExchange(ssl_kea_ecdh);
+
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ec_secp256r1};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  CheckConnected();
+
+  // The renegotiation has to use the same preferences as the original session.
+  server_->PrepareForRenegotiate();
+  client_->StartRenegotiate();
+  Handshake();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+TEST_P(TlsKeyExchangeTest, Curve25519) {
+  Reset(TlsAgent::kServerEcdsa256);
+  const std::vector<SSLNamedGroup> groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp521r1};
+  EnsureKeyShareSetup();
+  ConfigNamedGroups(groups);
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, ssl_auth_ecdsa,
+            ssl_sig_ecdsa_secp256r1_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(groups, shares);
+}
+
+TEST_P(TlsConnectGenericPre13, GroupPreferenceServerPriority) {
+  EnsureTlsSetup();
+  client_->DisableAllCiphers();
+  client_->EnableCiphersByKeyExchange(ssl_kea_ecdh);
+
+  // The client prefers P256 while the server prefers 25519.
+  // The server's preference has to win.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ec_curve25519};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_curve25519,
+                                                    ssl_grp_ec_secp256r1};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+}
+
+#ifndef NSS_DISABLE_TLS_1_3
+TEST_P(TlsKeyExchangeTest13, Curve25519P256EqualPriorityClient13) {
+  EnsureKeyShareSetup();
+
+  // The client sends a P256 key share while the server prefers 25519.
+  // We have to accept P256 without retry.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ec_curve25519};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_curve25519,
+                                                    ssl_grp_ec_secp256r1};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_secp256r1};
+  CheckKEXDetails(client_groups, shares);
+}
+
+TEST_P(TlsKeyExchangeTest13, Curve25519P256EqualPriorityServer13) {
+  EnsureKeyShareSetup();
+
+  // The client sends a 25519 key share while the server prefers P256.
+  // We have to accept 25519 without retry.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_curve25519,
+                                                    ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(client_groups, shares);
+}
+
+TEST_P(TlsKeyExchangeTest13, EqualPriorityTestRetryECServer13) {
+  EnsureKeyShareSetup();
+
+  // The client sends a 25519 key share while the server prefers P256.
+  // The server prefers P-384 over x25519, so it must not consider P-256 and
+  // x25519 to be equivalent. It will therefore request a P-256 share
+  // with a HelloRetryRequest.
+  const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1};
+  const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1, ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(client_groups, shares, ssl_grp_ec_secp256r1);
+}
+
+TEST_P(TlsKeyExchangeTest13, NotEqualPriorityWithIntermediateGroup13) {
+  EnsureKeyShareSetup();
+
+  // The client sends a 25519 key share while the server prefers P256.
+  // The server prefers ffdhe_2048 over x25519, so it must not consider the
+  // P-256 and x25519 to be equivalent. It will therefore request a P-256 share
+  // with a HelloRetryRequest.
+  const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ffdhe_2048};
+  const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_secp256r1, ssl_grp_ffdhe_2048, ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(client_groups, shares, ssl_grp_ec_secp256r1);
+}
+
+TEST_P(TlsKeyExchangeTest13,
+       NotEqualPriorityWithUnsupportedFFIntermediateGroup13) {
+  EnsureKeyShareSetup();
+
+  // As in the previous test, the server prefers ffdhe_2048. Thus, even though
+  // the client doesn't support this group, the server must not regard x25519 as
+  // equivalent to P-256.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_curve25519,
+                                                    ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_secp256r1, ssl_grp_ffdhe_2048, ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(client_groups, shares, ssl_grp_ec_secp256r1);
+}
+
+TEST_P(TlsKeyExchangeTest13,
+       NotEqualPriorityWithUnsupportedECIntermediateGroup13) {
+  EnsureKeyShareSetup();
+
+  // As in the previous test, the server prefers P-384. Thus, even though
+  // the client doesn't support this group, the server must not regard x25519 as
+  // equivalent to P-256. The server sends a HelloRetryRequest.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_curve25519,
+                                                    ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1, ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(client_groups, shares, ssl_grp_ec_secp256r1);
+}
+
+TEST_P(TlsKeyExchangeTest13, EqualPriority13) {
+  EnsureKeyShareSetup();
+
+  // The client sends a 25519 key share while the server prefers P256.
+  // We have to accept 25519 without retry because it's considered equivalent to
+  // P256 by the server.
+  const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ffdhe_2048, ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  Connect();
+
+  CheckKeys();
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519};
+  CheckKEXDetails(client_groups, shares);
+}
+#endif
+
+TEST_P(TlsConnectGeneric, P256ClientAndCurve25519Server) {
+  EnsureTlsSetup();
+  client_->DisableAllCiphers();
+  client_->EnableCiphersByKeyExchange(ssl_kea_ecdh);
+
+  // The client sends a P256 key share while the server prefers 25519.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_curve25519};
+
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+TEST_P(TlsKeyExchangeTest13, MultipleClientShares) {
+  EnsureKeyShareSetup();
+
+  // The client sends 25519 and P256 key shares. The server prefers P256,
+  // which must be chosen here.
+  const std::vector<SSLNamedGroup> client_groups = {ssl_grp_ec_curve25519,
+                                                    ssl_grp_ec_secp256r1};
+  const std::vector<SSLNamedGroup> server_groups = {ssl_grp_ec_secp256r1,
+                                                    ssl_grp_ec_curve25519};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+
+  // Generate a key share on the client for both curves.
+  EXPECT_EQ(SECSuccess, SSL_SendAdditionalKeyShares(client_->ssl_fd(), 1));
+
+  Connect();
+
+  // The server would accept 25519 but its preferred group (P256) has to win.
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_secp256r1, ssl_auth_rsa_sign,
+            ssl_sig_rsa_pss_sha256);
+  const std::vector<SSLNamedGroup> shares = {ssl_grp_ec_curve25519,
+                                             ssl_grp_ec_secp256r1};
+  CheckKEXDetails(client_groups, shares);
+}
+
+// Replace the point in the client key exchange message with an empty one
+class ECCClientKEXFilter : public TlsHandshakeFilter {
+ public:
+  ECCClientKEXFilter() {}
+
+ protected:
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader &header,
+                                               const DataBuffer &input,
+                                               DataBuffer *output) {
+    if (header.handshake_type() != kTlsHandshakeClientKeyExchange) {
+      return KEEP;
+    }
+
+    // Replace the client key exchange message with an empty point
+    output->Allocate(1);
+    output->Write(0, 0U, 1);  // set point length 0
+    return CHANGE;
+  }
+};
+
+// Replace the point in the server key exchange message with an empty one
+class ECCServerKEXFilter : public TlsHandshakeFilter {
+ public:
+  ECCServerKEXFilter() {}
+
+ protected:
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader &header,
+                                               const DataBuffer &input,
+                                               DataBuffer *output) {
+    if (header.handshake_type() != kTlsHandshakeServerKeyExchange) {
+      return KEEP;
+    }
+
+    // Replace the server key exchange message with an empty point
+    output->Allocate(4);
+    output->Write(0, 3U, 1);  // named curve
+    uint32_t curve;
+    EXPECT_TRUE(input.Read(1, 2, &curve));  // get curve id
+    output->Write(1, curve, 2);             // write curve id
+    output->Write(3, 0U, 1);                // point length 0
+    return CHANGE;
+  }
+};
+
+TEST_P(TlsConnectGenericPre13, ConnectECDHEmptyServerPoint) {
+  // add packet filter
+  server_->SetPacketFilter(new ECCServerKEXFilter());
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_KEY_EXCH);
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectECDHEmptyClientPoint) {
+  // add packet filter
+  client_->SetPacketFilter(new ECCClientKEXFilter());
+  ConnectExpectFail();
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_KEY_EXCH);
+}
+
+INSTANTIATE_TEST_CASE_P(KeyExchangeTest, TlsKeyExchangeTest,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV11Plus));
+
+#ifndef NSS_DISABLE_TLS_1_3
+INSTANTIATE_TEST_CASE_P(KeyExchangeTest, TlsKeyExchangeTest13,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV13));
+#endif
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_ems_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_ems_unittest.cc
new file mode 100644
index 0000000000..b9c725b365
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_ems_unittest.cc
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecret) {
+  EnableExtendedMasterSecret();
+  Connect();
+  Reset();
+  ExpectResumption(RESUME_SESSIONID);
+  EnableExtendedMasterSecret();
+  Connect();
+}
+
+TEST_P(TlsConnectTls12, ConnectExtendedMasterSecretSha384) {
+  EnableExtendedMasterSecret();
+  server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384);
+  ConnectWithCipherSuite(TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384);
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecretStaticRSA) {
+  EnableOnlyStaticRsaCiphers();
+  EnableExtendedMasterSecret();
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecretECDHE) {
+  EnableExtendedMasterSecret();
+  Connect();
+
+  Reset();
+  EnableExtendedMasterSecret();
+  ExpectResumption(RESUME_SESSIONID);
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecretTicket) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  EnableExtendedMasterSecret();
+  Connect();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+
+  EnableExtendedMasterSecret();
+  ExpectResumption(RESUME_TICKET);
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecretClientOnly) {
+  client_->EnableExtendedMasterSecret();
+  ExpectExtendedMasterSecret(false);
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecretServerOnly) {
+  server_->EnableExtendedMasterSecret();
+  ExpectExtendedMasterSecret(false);
+  Connect();
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectExtendedMasterSecretResumeWithout) {
+  EnableExtendedMasterSecret();
+  Connect();
+
+  Reset();
+  server_->EnableExtendedMasterSecret();
+  auto alert_recorder = new TlsAlertRecorder();
+  server_->SetPacketFilter(alert_recorder);
+  ConnectExpectFail();
+  EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+  EXPECT_EQ(kTlsAlertHandshakeFailure, alert_recorder->description());
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectNormalResumeWithExtendedMasterSecret) {
+  ConfigureSessionCache(RESUME_SESSIONID, RESUME_SESSIONID);
+  ExpectExtendedMasterSecret(false);
+  Connect();
+
+  Reset();
+  EnableExtendedMasterSecret();
+  ExpectResumption(RESUME_NONE);
+  Connect();
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_exporter_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_exporter_unittest.cc
new file mode 100644
index 0000000000..0a0d9f25f2
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_exporter_unittest.cc
@@ -0,0 +1,122 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ssl.h"
+
+#include "gtest_utils.h"
+#include "tls_connect.h"
+
+namespace nss_test {
+
+static const char* kExporterLabel = "EXPORTER-duck";
+static const uint8_t kExporterContext[] = {0x12, 0x34, 0x56};
+
+static void ExportAndCompare(TlsAgent* client, TlsAgent* server, bool context) {
+  static const size_t exporter_len = 10;
+  uint8_t client_value[exporter_len] = {0};
+  EXPECT_EQ(SECSuccess,
+            SSL_ExportKeyingMaterial(
+                client->ssl_fd(), kExporterLabel, strlen(kExporterLabel),
+                context ? PR_TRUE : PR_FALSE, kExporterContext,
+                sizeof(kExporterContext), client_value, sizeof(client_value)));
+  uint8_t server_value[exporter_len] = {0xff};
+  EXPECT_EQ(SECSuccess,
+            SSL_ExportKeyingMaterial(
+                server->ssl_fd(), kExporterLabel, strlen(kExporterLabel),
+                context ? PR_TRUE : PR_FALSE, kExporterContext,
+                sizeof(kExporterContext), server_value, sizeof(server_value)));
+  EXPECT_EQ(0, memcmp(client_value, server_value, sizeof(client_value)));
+}
+
+TEST_P(TlsConnectGeneric, ExporterBasic) {
+  EnsureTlsSetup();
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    server_->EnableSingleCipher(TLS_AES_128_GCM_SHA256);
+  } else {
+    server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+  }
+  Connect();
+  CheckKeys();
+  ExportAndCompare(client_, server_, false);
+}
+
+TEST_P(TlsConnectGeneric, ExporterContext) {
+  EnsureTlsSetup();
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    server_->EnableSingleCipher(TLS_AES_128_GCM_SHA256);
+  } else {
+    server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+  }
+  Connect();
+  CheckKeys();
+  ExportAndCompare(client_, server_, true);
+}
+
+// Bug 1312976 - SHA-384 doesn't work in 1.2 right now.
+TEST_P(TlsConnectTls13, ExporterSha384) {
+  EnsureTlsSetup();
+  client_->EnableSingleCipher(TLS_AES_256_GCM_SHA384);
+  Connect();
+  CheckKeys();
+  ExportAndCompare(client_, server_, false);
+}
+
+TEST_P(TlsConnectTls13, ExporterContextEmptyIsSameAsNone) {
+  EnsureTlsSetup();
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    server_->EnableSingleCipher(TLS_AES_128_GCM_SHA256);
+  } else {
+    server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+  }
+  Connect();
+  CheckKeys();
+  ExportAndCompare(client_, server_, false);
+}
+
+// This has a weird signature so that it can be passed to the SNI callback.
+int32_t RegularExporterShouldFail(TlsAgent* agent, const SECItem* srvNameArr,
+                                  PRUint32 srvNameArrSize) {
+  uint8_t val[10];
+  EXPECT_EQ(SECFailure, SSL_ExportKeyingMaterial(
+                            agent->ssl_fd(), kExporterLabel,
+                            strlen(kExporterLabel), PR_TRUE, kExporterContext,
+                            sizeof(kExporterContext), val, sizeof(val)))
+      << "regular exporter should fail";
+  return 0;
+}
+
+TEST_P(TlsConnectTls13, EarlyExporter) {
+  SetupForZeroRtt();
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+
+  client_->Handshake();  // Send ClientHello.
+  uint8_t client_value[10] = {0};
+  RegularExporterShouldFail(client_, nullptr, 0);
+  EXPECT_EQ(SECSuccess,
+            SSL_ExportEarlyKeyingMaterial(
+                client_->ssl_fd(), kExporterLabel, strlen(kExporterLabel),
+                kExporterContext, sizeof(kExporterContext), client_value,
+                sizeof(client_value)));
+
+  server_->SetSniCallback(RegularExporterShouldFail);
+  server_->Handshake();  // Handle ClientHello.
+  uint8_t server_value[10] = {0};
+  EXPECT_EQ(SECSuccess,
+            SSL_ExportEarlyKeyingMaterial(
+                server_->ssl_fd(), kExporterLabel, strlen(kExporterLabel),
+                kExporterContext, sizeof(kExporterContext), server_value,
+                sizeof(server_value)));
+  EXPECT_EQ(0, memcmp(client_value, server_value, sizeof(client_value)));
+
+  Handshake();
+  ExpectEarlyDataAccepted(true);
+  CheckConnected();
+  SendReceive();
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_extension_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_extension_unittest.cc
new file mode 100644
index 0000000000..9200e724ba
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_extension_unittest.cc
@@ -0,0 +1,985 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ssl.h"
+#include "ssl3prot.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+#include <memory>
+
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+class TlsExtensionTruncator : public TlsExtensionFilter {
+ public:
+  TlsExtensionTruncator(uint16_t extension, size_t length)
+      : extension_(extension), length_(length) {}
+  virtual PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) {
+    if (extension_type != extension_) {
+      return KEEP;
+    }
+    if (input.len() <= length_) {
+      return KEEP;
+    }
+
+    output->Assign(input.data(), length_);
+    return CHANGE;
+  }
+
+ private:
+  uint16_t extension_;
+  size_t length_;
+};
+
+class TlsExtensionDamager : public TlsExtensionFilter {
+ public:
+  TlsExtensionDamager(uint16_t extension, size_t index)
+      : extension_(extension), index_(index) {}
+  virtual PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) {
+    if (extension_type != extension_) {
+      return KEEP;
+    }
+
+    *output = input;
+    output->data()[index_] += 73;  // Increment selected for maximum damage
+    return CHANGE;
+  }
+
+ private:
+  uint16_t extension_;
+  size_t index_;
+};
+
+class TlsExtensionInjector : public TlsHandshakeFilter {
+ public:
+  TlsExtensionInjector(uint16_t ext, DataBuffer& data)
+      : extension_(ext), data_(data) {}
+
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) {
+    size_t offset;
+    if (header.handshake_type() == kTlsHandshakeClientHello) {
+      TlsParser parser(input);
+      if (!TlsExtensionFilter::FindClientHelloExtensions(&parser, header)) {
+        return KEEP;
+      }
+      offset = parser.consumed();
+    } else if (header.handshake_type() == kTlsHandshakeServerHello) {
+      TlsParser parser(input);
+      if (!TlsExtensionFilter::FindServerHelloExtensions(&parser)) {
+        return KEEP;
+      }
+      offset = parser.consumed();
+    } else {
+      return KEEP;
+    }
+
+    *output = input;
+
+    // Increase the size of the extensions.
+    uint16_t ext_len;
+    memcpy(&ext_len, output->data() + offset, sizeof(ext_len));
+    ext_len = htons(ntohs(ext_len) + data_.len() + 4);
+    memcpy(output->data() + offset, &ext_len, sizeof(ext_len));
+
+    // Insert the extension type and length.
+    DataBuffer type_length;
+    type_length.Allocate(4);
+    type_length.Write(0, extension_, 2);
+    type_length.Write(2, data_.len(), 2);
+    output->Splice(type_length, offset + 2);
+
+    // Insert the payload.
+    if (data_.len() > 0) {
+      output->Splice(data_, offset + 6);
+    }
+
+    return CHANGE;
+  }
+
+ private:
+  const uint16_t extension_;
+  const DataBuffer data_;
+};
+
+class TlsExtensionAppender : public TlsHandshakeFilter {
+ public:
+  TlsExtensionAppender(uint16_t ext, DataBuffer& data)
+      : extension_(ext), data_(data) {}
+
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) {
+    size_t offset;
+    TlsParser parser(input);
+    if (header.handshake_type() == kTlsHandshakeClientHello) {
+      if (!TlsExtensionFilter::FindClientHelloExtensions(&parser, header)) {
+        return KEEP;
+      }
+    } else if (header.handshake_type() == kTlsHandshakeServerHello) {
+      if (!TlsExtensionFilter::FindServerHelloExtensions(&parser)) {
+        return KEEP;
+      }
+    } else {
+      return KEEP;
+    }
+    offset = parser.consumed();
+    *output = input;
+
+    uint32_t ext_len;
+    if (!parser.Read(&ext_len, 2)) {
+      ADD_FAILURE();
+      return KEEP;
+    }
+
+    ext_len += 4 + data_.len();
+    output->Write(offset, ext_len, 2);
+
+    offset = output->len();
+    offset = output->Write(offset, extension_, 2);
+    WriteVariable(output, offset, data_, 2);
+
+    return CHANGE;
+  }
+
+ private:
+  const uint16_t extension_;
+  const DataBuffer data_;
+};
+
+class TlsExtensionTestBase : public TlsConnectTestBase {
+ protected:
+  TlsExtensionTestBase(Mode mode, uint16_t version)
+      : TlsConnectTestBase(mode, version) {}
+  TlsExtensionTestBase(const std::string& mode, uint16_t version)
+      : TlsConnectTestBase(mode, version) {}
+
+  void ClientHelloErrorTest(PacketFilter* filter,
+                            uint8_t alert = kTlsAlertDecodeError) {
+    auto alert_recorder = new TlsAlertRecorder();
+    server_->SetPacketFilter(alert_recorder);
+    if (filter) {
+      client_->SetPacketFilter(filter);
+    }
+    ConnectExpectFail();
+    EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+    EXPECT_EQ(alert, alert_recorder->description());
+  }
+
+  void ServerHelloErrorTest(PacketFilter* filter,
+                            uint8_t alert = kTlsAlertDecodeError) {
+    auto alert_recorder = new TlsAlertRecorder();
+    client_->SetPacketFilter(alert_recorder);
+    if (filter) {
+      server_->SetPacketFilter(filter);
+    }
+    ConnectExpectFail();
+    EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+    EXPECT_EQ(alert, alert_recorder->description());
+  }
+
+  static void InitSimpleSni(DataBuffer* extension) {
+    const char* name = "host.name";
+    const size_t namelen = PL_strlen(name);
+    extension->Allocate(namelen + 5);
+    extension->Write(0, namelen + 3, 2);
+    extension->Write(2, static_cast<uint32_t>(0), 1);  // 0 == hostname
+    extension->Write(3, namelen, 2);
+    extension->Write(5, reinterpret_cast<const uint8_t*>(name), namelen);
+  }
+
+  void HrrThenRemoveExtensionsTest(SSLExtensionType type, PRInt32 client_error,
+                                   PRInt32 server_error) {
+    static const std::vector<SSLNamedGroup> client_groups = {
+        ssl_grp_ec_secp384r1, ssl_grp_ec_curve25519};
+    static const std::vector<SSLNamedGroup> server_groups = {
+        ssl_grp_ec_curve25519, ssl_grp_ec_secp384r1};
+    client_->ConfigNamedGroups(client_groups);
+    server_->ConfigNamedGroups(server_groups);
+    EnsureTlsSetup();
+    client_->StartConnect();
+    server_->StartConnect();
+    client_->Handshake();  // Send ClientHello
+    server_->Handshake();  // Send HRR.
+    client_->SetPacketFilter(new TlsExtensionDropper(type));
+    Handshake();
+    client_->CheckErrorCode(client_error);
+    server_->CheckErrorCode(server_error);
+  }
+};
+
+class TlsExtensionTestDtls : public TlsExtensionTestBase,
+                             public ::testing::WithParamInterface<uint16_t> {
+ public:
+  TlsExtensionTestDtls() : TlsExtensionTestBase(DGRAM, GetParam()) {}
+};
+
+class TlsExtensionTest12Plus
+    : public TlsExtensionTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsExtensionTest12Plus()
+      : TlsExtensionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {
+  }
+};
+
+class TlsExtensionTest12
+    : public TlsExtensionTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsExtensionTest12()
+      : TlsExtensionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {
+  }
+};
+
+class TlsExtensionTest13 : public TlsExtensionTestBase,
+                           public ::testing::WithParamInterface<std::string> {
+ public:
+  TlsExtensionTest13()
+      : TlsExtensionTestBase(GetParam(), SSL_LIBRARY_VERSION_TLS_1_3) {}
+
+  void ConnectWithBogusVersionList(const uint8_t* buf, size_t len) {
+    DataBuffer versions_buf(buf, len);
+    client_->SetPacketFilter(new TlsExtensionReplacer(
+        ssl_tls13_supported_versions_xtn, versions_buf));
+    ConnectExpectFail();
+    client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+    server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+  }
+
+  void ConnectWithReplacementVersionList(uint16_t version) {
+    DataBuffer versions_buf;
+
+    size_t index = versions_buf.Write(0, 2, 1);
+    versions_buf.Write(index, version, 2);
+    client_->SetPacketFilter(new TlsExtensionReplacer(
+        ssl_tls13_supported_versions_xtn, versions_buf));
+    ConnectExpectFail();
+  }
+};
+
+class TlsExtensionTest13Stream : public TlsExtensionTestBase {
+ public:
+  TlsExtensionTest13Stream()
+      : TlsExtensionTestBase(STREAM, SSL_LIBRARY_VERSION_TLS_1_3) {}
+};
+
+class TlsExtensionTestGeneric
+    : public TlsExtensionTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsExtensionTestGeneric()
+      : TlsExtensionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {
+  }
+};
+
+class TlsExtensionTestPre13
+    : public TlsExtensionTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsExtensionTestPre13()
+      : TlsExtensionTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {
+  }
+};
+
+TEST_P(TlsExtensionTestGeneric, DamageSniLength) {
+  ClientHelloErrorTest(new TlsExtensionDamager(ssl_server_name_xtn, 1));
+}
+
+TEST_P(TlsExtensionTestGeneric, DamageSniHostLength) {
+  ClientHelloErrorTest(new TlsExtensionDamager(ssl_server_name_xtn, 4));
+}
+
+TEST_P(TlsExtensionTestGeneric, TruncateSni) {
+  ClientHelloErrorTest(new TlsExtensionTruncator(ssl_server_name_xtn, 7));
+}
+
+// A valid extension that appears twice will be reported as unsupported.
+TEST_P(TlsExtensionTestGeneric, RepeatSni) {
+  DataBuffer extension;
+  InitSimpleSni(&extension);
+  ClientHelloErrorTest(new TlsExtensionInjector(ssl_server_name_xtn, extension),
+                       kTlsAlertIllegalParameter);
+}
+
+// An SNI entry with zero length is considered invalid (strangely, not if it is
+// the last entry, which is probably a bug).
+TEST_P(TlsExtensionTestGeneric, BadSni) {
+  DataBuffer simple;
+  InitSimpleSni(&simple);
+  DataBuffer extension;
+  extension.Allocate(simple.len() + 3);
+  extension.Write(0, static_cast<uint32_t>(0), 3);
+  extension.Write(3, simple);
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_server_name_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestGeneric, EmptySni) {
+  DataBuffer extension;
+  extension.Allocate(2);
+  extension.Write(0, static_cast<uint32_t>(0), 2);
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_server_name_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestGeneric, EmptyAlpnExtension) {
+  EnableAlpn();
+  DataBuffer extension;
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension),
+      kTlsAlertIllegalParameter);
+}
+
+// An empty ALPN isn't considered bad, though it does lead to there being no
+// protocol for the server to select.
+TEST_P(TlsExtensionTestGeneric, EmptyAlpnList) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension),
+      kTlsAlertNoApplicationProtocol);
+}
+
+TEST_P(TlsExtensionTestGeneric, OneByteAlpn) {
+  EnableAlpn();
+  ClientHelloErrorTest(
+      new TlsExtensionTruncator(ssl_app_layer_protocol_xtn, 1));
+}
+
+TEST_P(TlsExtensionTestGeneric, AlpnMissingValue) {
+  EnableAlpn();
+  // This will leave the length of the second entry, but no value.
+  ClientHelloErrorTest(
+      new TlsExtensionTruncator(ssl_app_layer_protocol_xtn, 5));
+}
+
+TEST_P(TlsExtensionTestGeneric, AlpnZeroLength) {
+  EnableAlpn();
+  const uint8_t val[] = {0x01, 0x61, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestGeneric, AlpnMismatch) {
+  const uint8_t client_alpn[] = {0x01, 0x61};
+  client_->EnableAlpn(client_alpn, sizeof(client_alpn));
+  const uint8_t server_alpn[] = {0x02, 0x61, 0x62};
+  server_->EnableAlpn(server_alpn, sizeof(server_alpn));
+
+  ClientHelloErrorTest(nullptr, kTlsAlertNoApplicationProtocol);
+}
+
+// Many of these tests fail in TLS 1.3 because the extension is encrypted, which
+// prevents modification of the value from the ServerHello.
+TEST_P(TlsExtensionTestPre13, AlpnReturnedEmptyList) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ServerHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, AlpnReturnedEmptyName) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x01, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ServerHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, AlpnReturnedListTrailingData) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x02, 0x01, 0x61, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ServerHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, AlpnReturnedExtraEntry) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x04, 0x01, 0x61, 0x01, 0x62};
+  DataBuffer extension(val, sizeof(val));
+  ServerHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, AlpnReturnedBadListLength) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x99, 0x01, 0x61, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ServerHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, AlpnReturnedBadNameLength) {
+  EnableAlpn();
+  const uint8_t val[] = {0x00, 0x02, 0x99, 0x61};
+  DataBuffer extension(val, sizeof(val));
+  ServerHelloErrorTest(
+      new TlsExtensionReplacer(ssl_app_layer_protocol_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestDtls, SrtpShort) {
+  EnableSrtp();
+  ClientHelloErrorTest(new TlsExtensionTruncator(ssl_use_srtp_xtn, 3));
+}
+
+TEST_P(TlsExtensionTestDtls, SrtpOdd) {
+  EnableSrtp();
+  const uint8_t val[] = {0x00, 0x01, 0xff, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(new TlsExtensionReplacer(ssl_use_srtp_xtn, extension));
+}
+
+TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsBadLength) {
+  const uint8_t val[] = {0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_signature_algorithms_xtn, extension));
+}
+
+TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsTrailingData) {
+  const uint8_t val[] = {0x00, 0x02, 0x04, 0x01, 0x00};  // sha-256, rsa
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_signature_algorithms_xtn, extension));
+}
+
+TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsEmpty) {
+  const uint8_t val[] = {0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_signature_algorithms_xtn, extension));
+}
+
+TEST_P(TlsExtensionTest12Plus, SignatureAlgorithmsOddLength) {
+  const uint8_t val[] = {0x00, 0x01, 0x04};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_signature_algorithms_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestGeneric, NoSupportedGroups) {
+  ClientHelloErrorTest(new TlsExtensionDropper(ssl_supported_groups_xtn),
+                       version_ < SSL_LIBRARY_VERSION_TLS_1_3
+                           ? kTlsAlertDecryptError
+                           : kTlsAlertMissingExtension);
+}
+
+TEST_P(TlsExtensionTestGeneric, SupportedCurvesShort) {
+  const uint8_t val[] = {0x00, 0x01, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_elliptic_curves_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestGeneric, SupportedCurvesBadLength) {
+  const uint8_t val[] = {0x09, 0x99, 0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_elliptic_curves_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestGeneric, SupportedCurvesTrailingData) {
+  const uint8_t val[] = {0x00, 0x02, 0x00, 0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_elliptic_curves_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, SupportedPointsEmpty) {
+  const uint8_t val[] = {0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_ec_point_formats_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, SupportedPointsBadLength) {
+  const uint8_t val[] = {0x99, 0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_ec_point_formats_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, SupportedPointsTrailingData) {
+  const uint8_t val[] = {0x01, 0x00, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_ec_point_formats_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, RenegotiationInfoBadLength) {
+  const uint8_t val[] = {0x99};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_renegotiation_info_xtn, extension));
+}
+
+TEST_P(TlsExtensionTestPre13, RenegotiationInfoMismatch) {
+  const uint8_t val[] = {0x01, 0x00};
+  DataBuffer extension(val, sizeof(val));
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_renegotiation_info_xtn, extension));
+}
+
+// The extension has to contain a length.
+TEST_P(TlsExtensionTestPre13, RenegotiationInfoExtensionEmpty) {
+  DataBuffer extension;
+  ClientHelloErrorTest(
+      new TlsExtensionReplacer(ssl_renegotiation_info_xtn, extension));
+}
+
+// This only works on TLS 1.2, since it relies on static RSA; otherwise libssl
+// picks the wrong cipher suite.
+TEST_P(TlsExtensionTest12, SignatureAlgorithmConfiguration) {
+  const SSLSignatureScheme schemes[] = {ssl_sig_rsa_pss_sha512,
+                                        ssl_sig_rsa_pss_sha384};
+
+  TlsExtensionCapture* capture =
+      new TlsExtensionCapture(ssl_signature_algorithms_xtn);
+  client_->SetSignatureSchemes(schemes, PR_ARRAY_SIZE(schemes));
+  client_->SetPacketFilter(capture);
+  EnableOnlyStaticRsaCiphers();
+  Connect();
+
+  const DataBuffer& ext = capture->extension();
+  EXPECT_EQ(2 + PR_ARRAY_SIZE(schemes) * 2, ext.len());
+  for (size_t i = 0, cursor = 2;
+       i < PR_ARRAY_SIZE(schemes) && cursor < ext.len(); ++i) {
+    uint32_t v = 0;
+    EXPECT_TRUE(ext.Read(cursor, 2, &v));
+    cursor += 2;
+    EXPECT_EQ(schemes[i], static_cast<SSLSignatureScheme>(v));
+  }
+}
+
+// Temporary test to verify that we choke on an empty ClientKeyShare.
+// This test will fail when we implement HelloRetryRequest.
+TEST_P(TlsExtensionTest13, EmptyClientKeyShare) {
+  ClientHelloErrorTest(new TlsExtensionTruncator(ssl_tls13_key_share_xtn, 2),
+                       kTlsAlertHandshakeFailure);
+}
+
+// These tests only work in stream mode because the client sends a
+// cleartext alert which causes a MAC error on the server. With
+// stream this causes handshake failure but with datagram, the
+// packet gets dropped.
+TEST_F(TlsExtensionTest13Stream, DropServerKeyShare) {
+  EnsureTlsSetup();
+  server_->SetPacketFilter(new TlsExtensionDropper(ssl_tls13_key_share_xtn));
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_MISSING_KEY_SHARE, client_->error_code());
+  EXPECT_EQ(SSL_ERROR_BAD_MAC_READ, server_->error_code());
+}
+
+TEST_F(TlsExtensionTest13Stream, WrongServerKeyShare) {
+  const uint16_t wrong_group = ssl_grp_ec_secp384r1;
+
+  static const uint8_t key_share[] = {
+      wrong_group >> 8,
+      wrong_group & 0xff,  // Group we didn't offer.
+      0x00,
+      0x02,  // length = 2
+      0x01,
+      0x02};
+  DataBuffer buf(key_share, sizeof(key_share));
+  EnsureTlsSetup();
+  server_->SetPacketFilter(
+      new TlsExtensionReplacer(ssl_tls13_key_share_xtn, buf));
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_KEY_SHARE, client_->error_code());
+  EXPECT_EQ(SSL_ERROR_BAD_MAC_READ, server_->error_code());
+}
+
+// TODO(ekr@rtfm.com): This is the wrong error code. See bug 1307269.
+TEST_F(TlsExtensionTest13Stream, UnknownServerKeyShare) {
+  const uint16_t wrong_group = 0xffff;
+
+  static const uint8_t key_share[] = {
+      wrong_group >> 8,
+      wrong_group & 0xff,  // Group we didn't offer.
+      0x00,
+      0x02,  // length = 2
+      0x01,
+      0x02};
+  DataBuffer buf(key_share, sizeof(key_share));
+  EnsureTlsSetup();
+  server_->SetPacketFilter(
+      new TlsExtensionReplacer(ssl_tls13_key_share_xtn, buf));
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_MISSING_KEY_SHARE, client_->error_code());
+  EXPECT_EQ(SSL_ERROR_BAD_MAC_READ, server_->error_code());
+}
+
+TEST_F(TlsExtensionTest13Stream, AddServerSignatureAlgorithmsOnResumption) {
+  SetupForResume();
+  DataBuffer empty;
+  server_->SetPacketFilter(
+      new TlsExtensionInjector(ssl_signature_algorithms_xtn, empty));
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_EXTENSION_DISALLOWED_FOR_VERSION, client_->error_code());
+  EXPECT_EQ(SSL_ERROR_BAD_MAC_READ, server_->error_code());
+}
+
+struct PskIdentity {
+  DataBuffer identity;
+  uint32_t obfuscated_ticket_age;
+};
+
+class TlsPreSharedKeyReplacer;
+
+typedef std::function<void(TlsPreSharedKeyReplacer*)>
+    TlsPreSharedKeyReplacerFunc;
+
+class TlsPreSharedKeyReplacer : public TlsExtensionFilter {
+ public:
+  TlsPreSharedKeyReplacer(TlsPreSharedKeyReplacerFunc function)
+      : identities_(), binders_(), function_(function) {}
+
+  static size_t CopyAndMaybeReplace(TlsParser* parser, size_t size,
+                                    const std::unique_ptr<DataBuffer>& replace,
+                                    size_t index, DataBuffer* output) {
+    DataBuffer tmp;
+    bool ret = parser->ReadVariable(&tmp, size);
+    EXPECT_EQ(true, ret);
+    if (!ret) return 0;
+    if (replace) {
+      tmp = *replace;
+    }
+
+    return WriteVariable(output, index, tmp, size);
+  }
+
+  PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                       const DataBuffer& input,
+                                       DataBuffer* output) {
+    if (extension_type != ssl_tls13_pre_shared_key_xtn) {
+      return KEEP;
+    }
+
+    if (!Decode(input)) {
+      return KEEP;
+    }
+
+    // Call the function.
+    function_(this);
+
+    Encode(output);
+
+    return CHANGE;
+  }
+
+  std::vector<PskIdentity> identities_;
+  std::vector<DataBuffer> binders_;
+
+ private:
+  bool Decode(const DataBuffer& input) {
+    std::unique_ptr<TlsParser> parser(new TlsParser(input));
+    DataBuffer identities;
+
+    if (!parser->ReadVariable(&identities, 2)) {
+      ADD_FAILURE();
+      return false;
+    }
+
+    DataBuffer binders;
+    if (!parser->ReadVariable(&binders, 2)) {
+      ADD_FAILURE();
+      return false;
+    }
+    EXPECT_EQ(0UL, parser->remaining());
+
+    // Now parse the inner sections.
+    parser.reset(new TlsParser(identities));
+    while (parser->remaining()) {
+      PskIdentity identity;
+
+      if (!parser->ReadVariable(&identity.identity, 2)) {
+        ADD_FAILURE();
+        return false;
+      }
+
+      if (!parser->Read(&identity.obfuscated_ticket_age, 4)) {
+        ADD_FAILURE();
+        return false;
+      }
+
+      identities_.push_back(identity);
+    }
+
+    parser.reset(new TlsParser(binders));
+    while (parser->remaining()) {
+      DataBuffer binder;
+
+      if (!parser->ReadVariable(&binder, 1)) {
+        ADD_FAILURE();
+        return false;
+      }
+
+      binders_.push_back(binder);
+    }
+
+    return true;
+  }
+
+  void Encode(DataBuffer* output) {
+    DataBuffer identities;
+    size_t index = 0;
+    for (auto id : identities_) {
+      index = WriteVariable(&identities, index, id.identity, 2);
+      index = identities.Write(index, id.obfuscated_ticket_age, 4);
+    }
+
+    DataBuffer binders;
+    index = 0;
+    for (auto binder : binders_) {
+      index = WriteVariable(&binders, index, binder, 1);
+    }
+
+    output->Truncate(0);
+    index = 0;
+    index = WriteVariable(output, index, identities, 2);
+    index = WriteVariable(output, index, binders, 2);
+  }
+
+  TlsPreSharedKeyReplacerFunc function_;
+};
+
+TEST_F(TlsExtensionTest13Stream, ResumeEmptyPskLabel) {
+  SetupForResume();
+
+  client_->SetPacketFilter(new TlsPreSharedKeyReplacer([](
+      TlsPreSharedKeyReplacer* r) { r->identities_[0].identity.Truncate(0); }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+}
+
+// Flip the first byte of the binder.
+TEST_F(TlsExtensionTest13Stream, ResumeIncorrectBinderValue) {
+  SetupForResume();
+
+  client_->SetPacketFilter(
+      new TlsPreSharedKeyReplacer([](TlsPreSharedKeyReplacer* r) {
+        r->binders_[0].Write(0, r->binders_[0].data()[0] ^ 0xff, 1);
+      }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+}
+
+// Extend the binder by one.
+TEST_F(TlsExtensionTest13Stream, ResumeIncorrectBinderLength) {
+  SetupForResume();
+
+  client_->SetPacketFilter(
+      new TlsPreSharedKeyReplacer([](TlsPreSharedKeyReplacer* r) {
+        r->binders_[0].Write(r->binders_[0].len(), 0xff, 1);
+      }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+}
+
+// Binders must be at least 32 bytes.
+TEST_F(TlsExtensionTest13Stream, ResumeBinderTooShort) {
+  SetupForResume();
+
+  client_->SetPacketFilter(new TlsPreSharedKeyReplacer(
+      [](TlsPreSharedKeyReplacer* r) { r->binders_[0].Truncate(31); }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+}
+
+// Duplicate the identity and binder. This will fail with an error
+// processing the binder (because we extended the identity list.)
+TEST_F(TlsExtensionTest13Stream, ResumeTwoPsks) {
+  SetupForResume();
+
+  client_->SetPacketFilter(
+      new TlsPreSharedKeyReplacer([](TlsPreSharedKeyReplacer* r) {
+        r->identities_.push_back(r->identities_[0]);
+        r->binders_.push_back(r->binders_[0]);
+      }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+}
+
+// The next two tests have mismatches in the number of identities
+// and binders. This generates an illegal parameter alert.
+TEST_F(TlsExtensionTest13Stream, ResumeTwoIdentitiesOneBinder) {
+  SetupForResume();
+
+  client_->SetPacketFilter(
+      new TlsPreSharedKeyReplacer([](TlsPreSharedKeyReplacer* r) {
+        r->identities_.push_back(r->identities_[0]);
+      }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+}
+
+TEST_F(TlsExtensionTest13Stream, ResumeOneIdentityTwoBinders) {
+  SetupForResume();
+
+  client_->SetPacketFilter(new TlsPreSharedKeyReplacer([](
+      TlsPreSharedKeyReplacer* r) { r->binders_.push_back(r->binders_[0]); }));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+}
+
+TEST_F(TlsExtensionTest13Stream, ResumePskExtensionNotLast) {
+  SetupForResume();
+
+  const uint8_t empty_buf[] = {0};
+  DataBuffer empty(empty_buf, 0);
+  client_->SetPacketFilter(
+      // Inject an unused extension.
+      new TlsExtensionAppender(0xffff, empty));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
+}
+
+TEST_F(TlsExtensionTest13Stream, ResumeNoKeModes) {
+  SetupForResume();
+
+  DataBuffer empty;
+  client_->SetPacketFilter(
+      new TlsExtensionDropper(ssl_tls13_psk_key_exchange_modes_xtn));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_MISSING_EXTENSION_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_MISSING_PSK_KEY_EXCHANGE_MODES);
+}
+
+// The following test contains valid but unacceptable PreSharedKey
+// modes and therefore produces non-resumption followed by MAC
+// errors.
+TEST_F(TlsExtensionTest13Stream, ResumeBogusKeModes) {
+  SetupForResume();
+  const static uint8_t ke_modes[] = {1,  // Length
+                                     kTls13PskKe};
+
+  DataBuffer modes(ke_modes, sizeof(ke_modes));
+  client_->SetPacketFilter(
+      new TlsExtensionReplacer(ssl_tls13_psk_key_exchange_modes_xtn, modes));
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
+  server_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
+}
+
+TEST_P(TlsExtensionTest13, NoKeModesIfResumptionOff) {
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+  auto capture = new TlsExtensionCapture(ssl_tls13_psk_key_exchange_modes_xtn);
+  client_->SetPacketFilter(capture);
+  Connect();
+  EXPECT_FALSE(capture->captured());
+}
+
+// In these tests, we downgrade to TLS 1.2, causing the
+// server to negotiate TLS 1.2.
+// 1. Both sides only support TLS 1.3, so we get a cipher version
+//    error.
+TEST_P(TlsExtensionTest13, RemoveTls13FromVersionList) {
+  ConnectWithReplacementVersionList(SSL_LIBRARY_VERSION_TLS_1_2);
+  client_->CheckErrorCode(SSL_ERROR_PROTOCOL_VERSION_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_VERSION);
+}
+
+// 2. Server supports 1.2 and 1.3, client supports 1.2, so we
+//    can't negotiate any ciphers.
+TEST_P(TlsExtensionTest13, RemoveTls13FromVersionListServerV12) {
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  ConnectWithReplacementVersionList(SSL_LIBRARY_VERSION_TLS_1_2);
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+// 3. Server supports 1.2 and 1.3, client supports 1.2 and 1.3
+// but advertises 1.2 (because we changed things).
+TEST_P(TlsExtensionTest13, RemoveTls13FromVersionListBothV12) {
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  ConnectWithReplacementVersionList(SSL_LIBRARY_VERSION_TLS_1_2);
+#ifndef TLS_1_3_DRAFT_VERSION
+  client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
+  server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+#else
+  client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+#endif
+}
+
+TEST_P(TlsExtensionTest13, HrrThenRemoveSignatureAlgorithms) {
+  HrrThenRemoveExtensionsTest(ssl_signature_algorithms_xtn,
+                              SSL_ERROR_MISSING_EXTENSION_ALERT,
+                              SSL_ERROR_MISSING_SIGNATURE_ALGORITHMS_EXTENSION);
+}
+
+TEST_P(TlsExtensionTest13, HrrThenRemoveKeyShare) {
+  HrrThenRemoveExtensionsTest(ssl_tls13_key_share_xtn,
+                              SSL_ERROR_ILLEGAL_PARAMETER_ALERT,
+                              SSL_ERROR_BAD_2ND_CLIENT_HELLO);
+}
+
+TEST_P(TlsExtensionTest13, HrrThenRemoveSupportedGroups) {
+  HrrThenRemoveExtensionsTest(ssl_supported_groups_xtn,
+                              SSL_ERROR_MISSING_EXTENSION_ALERT,
+                              SSL_ERROR_MISSING_SUPPORTED_GROUPS_EXTENSION);
+}
+
+TEST_P(TlsExtensionTest13, EmptyVersionList) {
+  static const uint8_t ext[] = {0x00, 0x00};
+  ConnectWithBogusVersionList(ext, sizeof(ext));
+}
+
+TEST_P(TlsExtensionTest13, OddVersionList) {
+  static const uint8_t ext[] = {0x00, 0x01, 0x00};
+  ConnectWithBogusVersionList(ext, sizeof(ext));
+}
+
+INSTANTIATE_TEST_CASE_P(ExtensionStream, TlsExtensionTestGeneric,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsVAll));
+INSTANTIATE_TEST_CASE_P(ExtensionDatagram, TlsExtensionTestGeneric,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV11Plus));
+INSTANTIATE_TEST_CASE_P(ExtensionDatagramOnly, TlsExtensionTestDtls,
+                        TlsConnectTestBase::kTlsV11Plus);
+
+INSTANTIATE_TEST_CASE_P(ExtensionTls12Plus, TlsExtensionTest12Plus,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV12Plus));
+
+INSTANTIATE_TEST_CASE_P(ExtensionPre13Stream, TlsExtensionTestPre13,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsV10ToV12));
+INSTANTIATE_TEST_CASE_P(ExtensionPre13Datagram, TlsExtensionTestPre13,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV11V12));
+
+INSTANTIATE_TEST_CASE_P(ExtensionTls13, TlsExtensionTest13,
+                        TlsConnectTestBase::kTlsModesAll);
+
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_fuzz_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_fuzz_unittest.cc
new file mode 100644
index 0000000000..d144cd7d9f
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_fuzz_unittest.cc
@@ -0,0 +1,223 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "blapi.h"
+#include "ssl.h"
+#include "sslimpl.h"
+#include "tls_connect.h"
+
+#include "gtest/gtest.h"
+
+namespace nss_test {
+
+#ifdef UNSAFE_FUZZER_MODE
+
+const uint8_t kShortEmptyFinished[8] = {0};
+const uint8_t kLongEmptyFinished[128] = {0};
+
+class TlsFuzzTest : public ::testing::Test {};
+
+// Record the application data stream.
+class TlsApplicationDataRecorder : public TlsRecordFilter {
+ public:
+  TlsApplicationDataRecorder() : buffer_() {}
+
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& input,
+                                            DataBuffer* output) {
+    if (header.content_type() == kTlsApplicationDataType) {
+      buffer_.Append(input);
+    }
+
+    return KEEP;
+  }
+
+  const DataBuffer& buffer() const { return buffer_; }
+
+ private:
+  DataBuffer buffer_;
+};
+
+// Damages an SKE or CV signature.
+class TlsSignatureDamager : public TlsHandshakeFilter {
+ public:
+  TlsSignatureDamager(uint8_t type) : type_(type) {}
+  virtual PacketFilter::Action FilterHandshake(
+      const TlsHandshakeFilter::HandshakeHeader& header,
+      const DataBuffer& input, DataBuffer* output) {
+    if (header.handshake_type() != type_) {
+      return KEEP;
+    }
+
+    *output = input;
+
+    // Modify the last byte of the signature.
+    output->data()[output->len() - 1]++;
+    return CHANGE;
+  }
+
+ private:
+  uint8_t type_;
+};
+
+void ResetState() {
+  // Clear the list of RSA blinding params.
+  BL_Cleanup();
+
+  // Reinit the list of RSA blinding params.
+  EXPECT_EQ(SECSuccess, BL_Init());
+
+  // Reset the RNG state.
+  EXPECT_EQ(SECSuccess, RNG_ResetForFuzzing());
+}
+
+// Ensure that ssl_Time() returns a constant value.
+TEST_F(TlsFuzzTest, Fuzz_SSL_Time_Constant) {
+  PRInt32 now = ssl_Time();
+  PR_Sleep(PR_SecondsToInterval(2));
+  EXPECT_EQ(ssl_Time(), now);
+}
+
+// Check that due to the deterministic PRNG we derive
+// the same master secret in two consecutive TLS sessions.
+TEST_P(TlsConnectGeneric, Fuzz_DeterministicExporter) {
+  const char kLabel[] = "label";
+  std::vector<unsigned char> out1(32), out2(32);
+
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+  DisableECDHEServerKeyReuse();
+
+  ResetState();
+  Connect();
+
+  // Export a key derived from the MS and nonces.
+  SECStatus rv =
+      SSL_ExportKeyingMaterial(client_->ssl_fd(), kLabel, strlen(kLabel), false,
+                               NULL, 0, out1.data(), out1.size());
+  EXPECT_EQ(SECSuccess, rv);
+
+  Reset();
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+  DisableECDHEServerKeyReuse();
+
+  ResetState();
+  Connect();
+
+  // Export another key derived from the MS and nonces.
+  rv = SSL_ExportKeyingMaterial(client_->ssl_fd(), kLabel, strlen(kLabel),
+                                false, NULL, 0, out2.data(), out2.size());
+  EXPECT_EQ(SECSuccess, rv);
+
+  // The two exported keys should be the same.
+  EXPECT_EQ(out1, out2);
+}
+
+// Check that due to the deterministic RNG two consecutive
+// TLS sessions will have the exact same transcript.
+TEST_P(TlsConnectGeneric, Fuzz_DeterministicTranscript) {
+  // Connect a few times and compare the transcripts byte-by-byte.
+  DataBuffer last;
+  for (size_t i = 0; i < 5; i++) {
+    Reset();
+    ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+    DisableECDHEServerKeyReuse();
+
+    DataBuffer buffer;
+    client_->SetPacketFilter(new TlsConversationRecorder(buffer));
+    server_->SetPacketFilter(new TlsConversationRecorder(buffer));
+
+    ResetState();
+    Connect();
+
+    // Ensure the filters go away before |buffer| does.
+    client_->SetPacketFilter(nullptr);
+    server_->SetPacketFilter(nullptr);
+
+    if (last.len() > 0) {
+      EXPECT_EQ(last, buffer);
+    }
+
+    last = buffer;
+  }
+}
+
+// Check that we can establish and use a connection
+// with all supported TLS versions, STREAM and DGRAM.
+// Check that records are NOT encrypted.
+// Check that records don't have a MAC.
+TEST_P(TlsConnectGeneric, Fuzz_ConnectSendReceive_NullCipher) {
+  EnsureTlsSetup();
+
+  // Set up app data filters.
+  auto client_recorder = new TlsApplicationDataRecorder();
+  client_->SetPacketFilter(client_recorder);
+  auto server_recorder = new TlsApplicationDataRecorder();
+  server_->SetPacketFilter(server_recorder);
+
+  Connect();
+
+  // Construct the plaintext.
+  DataBuffer buf;
+  buf.Allocate(50);
+  for (size_t i = 0; i < buf.len(); ++i) {
+    buf.data()[i] = i & 0xff;
+  }
+
+  // Send/Receive data.
+  client_->SendBuffer(buf);
+  server_->SendBuffer(buf);
+  Receive(buf.len());
+
+  // Check for plaintext on the wire.
+  EXPECT_EQ(buf, client_recorder->buffer());
+  EXPECT_EQ(buf, server_recorder->buffer());
+}
+
+// Check that an invalid Finished message doesn't abort the connection.
+TEST_P(TlsConnectGeneric, Fuzz_BogusClientFinished) {
+  EnsureTlsSetup();
+
+  auto i1 = new TlsInspectorReplaceHandshakeMessage(
+      kTlsHandshakeFinished,
+      DataBuffer(kShortEmptyFinished, sizeof(kShortEmptyFinished)));
+  client_->SetPacketFilter(i1);
+  Connect();
+  SendReceive();
+}
+
+// Check that an invalid Finished message doesn't abort the connection.
+TEST_P(TlsConnectGeneric, Fuzz_BogusServerFinished) {
+  EnsureTlsSetup();
+
+  auto i1 = new TlsInspectorReplaceHandshakeMessage(
+      kTlsHandshakeFinished,
+      DataBuffer(kLongEmptyFinished, sizeof(kLongEmptyFinished)));
+  server_->SetPacketFilter(i1);
+  Connect();
+  SendReceive();
+}
+
+// Check that an invalid server auth signature doesn't abort the connection.
+TEST_P(TlsConnectGeneric, Fuzz_BogusServerAuthSignature) {
+  EnsureTlsSetup();
+  uint8_t msg_type = version_ == SSL_LIBRARY_VERSION_TLS_1_3
+                         ? kTlsHandshakeCertificateVerify
+                         : kTlsHandshakeServerKeyExchange;
+  server_->SetPacketFilter(new TlsSignatureDamager(msg_type));
+  Connect();
+  SendReceive();
+}
+
+// Check that an invalid client auth signature doesn't abort the connection.
+TEST_P(TlsConnectGeneric, Fuzz_BogusClientAuthSignature) {
+  EnsureTlsSetup();
+  client_->SetupClientAuth();
+  server_->RequestClientAuth(true);
+  client_->SetPacketFilter(
+      new TlsSignatureDamager(kTlsHandshakeCertificateVerify));
+  Connect();
+}
+
+#endif
+}
diff --git a/security/nss/gtests/ssl_gtest/ssl_gtest.cc b/security/nss/gtests/ssl_gtest/ssl_gtest.cc
new file mode 100644
index 0000000000..2d08dd865d
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_gtest.cc
@@ -0,0 +1,44 @@
+#include "nspr.h"
+#include "nss.h"
+#include "prenv.h"
+#include "ssl.h"
+
+#include <cstdlib>
+
+#include "test_io.h"
+
+#define GTEST_HAS_RTTI 0
+#include "gtest/gtest.h"
+
+std::string g_working_dir_path;
+bool g_ssl_gtest_verbose;
+
+int main(int argc, char** argv) {
+  // Start the tests
+  ::testing::InitGoogleTest(&argc, argv);
+  g_working_dir_path = ".";
+  g_ssl_gtest_verbose = false;
+
+  char* workdir = PR_GetEnvSecure("NSS_GTEST_WORKDIR");
+  if (workdir) g_working_dir_path = workdir;
+
+  for (int i = 0; i < argc; i++) {
+    if (!strcmp(argv[i], "-d")) {
+      g_working_dir_path = argv[i + 1];
+      ++i;
+    } else if (!strcmp(argv[i], "-v")) {
+      g_ssl_gtest_verbose = true;
+    }
+  }
+
+  NSS_Initialize(g_working_dir_path.c_str(), "", "", SECMOD_DB,
+                 NSS_INIT_READONLY);
+  NSS_SetDomesticPolicy();
+  int rv = RUN_ALL_TESTS();
+
+  NSS_Shutdown();
+
+  nss_test::Poller::Shutdown();
+
+  return rv;
+}
diff --git a/security/nss/gtests/ssl_gtest/ssl_gtest.gyp b/security/nss/gtests/ssl_gtest/ssl_gtest.gyp
new file mode 100644
index 0000000000..e232a8b7e8
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_gtest.gyp
@@ -0,0 +1,101 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+{
+  'includes': [
+    '../../coreconf/config.gypi',
+    '../common/gtest.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'ssl_gtest',
+      'type': 'executable',
+      'sources': [
+        'libssl_internals.c',
+        'ssl_0rtt_unittest.cc',
+        'ssl_agent_unittest.cc',
+        'ssl_auth_unittest.cc',
+        'ssl_cert_ext_unittest.cc',
+        'ssl_ciphersuite_unittest.cc',
+        'ssl_damage_unittest.cc',
+        'ssl_dhe_unittest.cc',
+        'ssl_drop_unittest.cc',
+        'ssl_ecdh_unittest.cc',
+        'ssl_ems_unittest.cc',
+        'ssl_exporter_unittest.cc',
+        'ssl_extension_unittest.cc',
+        'ssl_fuzz_unittest.cc',
+        'ssl_gtest.cc',
+        'ssl_hrr_unittest.cc',
+        'ssl_loopback_unittest.cc',
+        'ssl_record_unittest.cc',
+        'ssl_resumption_unittest.cc',
+        'ssl_skip_unittest.cc',
+        'ssl_staticrsa_unittest.cc',
+        'ssl_v2_client_hello_unittest.cc',
+        'ssl_version_unittest.cc',
+        'test_io.cc',
+        'tls_agent.cc',
+        'tls_connect.cc',
+        'tls_filter.cc',
+        'tls_hkdf_unittest.cc',
+        'tls_parser.cc'
+      ],
+      'dependencies': [
+        '<(DEPTH)/exports.gyp:nss_exports',
+        '<(DEPTH)/lib/util/util.gyp:nssutil3',
+        '<(DEPTH)/lib/sqlite/sqlite.gyp:sqlite3',
+        '<(DEPTH)/gtests/google_test/google_test.gyp:gtest',
+        '<(DEPTH)/lib/softoken/softoken.gyp:softokn',
+        '<(DEPTH)/lib/smime/smime.gyp:smime',
+        '<(DEPTH)/lib/ssl/ssl.gyp:ssl',
+        '<(DEPTH)/lib/nss/nss.gyp:nss_static',
+        '<(DEPTH)/cmd/lib/lib.gyp:sectool',
+        '<(DEPTH)/lib/pkcs12/pkcs12.gyp:pkcs12',
+        '<(DEPTH)/lib/pkcs7/pkcs7.gyp:pkcs7',
+        '<(DEPTH)/lib/certhigh/certhigh.gyp:certhi',
+        '<(DEPTH)/lib/cryptohi/cryptohi.gyp:cryptohi',
+        '<(DEPTH)/lib/pk11wrap/pk11wrap.gyp:pk11wrap',
+        '<(DEPTH)/lib/softoken/softoken.gyp:softokn',
+        '<(DEPTH)/lib/certdb/certdb.gyp:certdb',
+        '<(DEPTH)/lib/pki/pki.gyp:nsspki',
+        '<(DEPTH)/lib/dev/dev.gyp:nssdev',
+        '<(DEPTH)/lib/base/base.gyp:nssb',
+        '<(DEPTH)/lib/freebl/freebl.gyp:<(freebl_name)',
+        '<(DEPTH)/lib/zlib/zlib.gyp:nss_zlib'
+      ],
+      'conditions': [
+        [ 'disable_dbm==0', {
+          'dependencies': [
+            '<(DEPTH)/lib/dbm/src/src.gyp:dbm',
+          ],
+        }],
+        [ 'disable_libpkix==0', {
+          'dependencies': [
+            '<(DEPTH)/lib/libpkix/pkix/certsel/certsel.gyp:pkixcertsel',
+            '<(DEPTH)/lib/libpkix/pkix/checker/checker.gyp:pkixchecker',
+            '<(DEPTH)/lib/libpkix/pkix/crlsel/crlsel.gyp:pkixcrlsel',
+            '<(DEPTH)/lib/libpkix/pkix/params/params.gyp:pkixparams',
+            '<(DEPTH)/lib/libpkix/pkix/results/results.gyp:pkixresults',
+            '<(DEPTH)/lib/libpkix/pkix/store/store.gyp:pkixstore',
+            '<(DEPTH)/lib/libpkix/pkix/top/top.gyp:pkixtop',
+            '<(DEPTH)/lib/libpkix/pkix/util/util.gyp:pkixutil',
+            '<(DEPTH)/lib/libpkix/pkix_pl_nss/system/system.gyp:pkixsystem',
+            '<(DEPTH)/lib/libpkix/pkix_pl_nss/module/module.gyp:pkixmodule',
+            '<(DEPTH)/lib/libpkix/pkix_pl_nss/pki/pki.gyp:pkixpki',
+          ],
+        }],
+      ],
+    }
+  ],
+  'target_defaults': {
+    'include_dirs': [
+      '../../gtests/google_test/gtest/include',
+      '../../gtests/common',
+      '../../lib/ssl'
+    ],
+  },
+  'variables': {
+    'module': 'nss',
+  }
+}
diff --git a/security/nss/gtests/ssl_gtest/ssl_hrr_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_hrr_unittest.cc
new file mode 100644
index 0000000000..5d670fa827
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_hrr_unittest.cc
@@ -0,0 +1,285 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+// This is internal, just to get TLS_1_3_DRAFT_VERSION.
+#include "ssl3prot.h"
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectTls13, HelloRetryRequestAbortsZeroRtt) {
+  const char* k0RttData = "Such is life";
+  const PRInt32 k0RttDataLen = static_cast<PRInt32>(strlen(k0RttData));
+
+  SetupForZeroRtt();  // initial handshake as normal
+
+  static const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_secp384r1,
+                                                    ssl_grp_ec_secp521r1};
+  server_->ConfigNamedGroups(groups);
+  client_->Set0RttEnabled(true);
+  server_->Set0RttEnabled(true);
+  ExpectResumption(RESUME_TICKET);
+
+  // Send first ClientHello and send 0-RTT data
+  auto capture_early_data = new TlsExtensionCapture(ssl_tls13_early_data_xtn);
+  client_->SetPacketFilter(capture_early_data);
+  client_->Handshake();
+  EXPECT_EQ(k0RttDataLen, PR_Write(client_->ssl_fd(), k0RttData,
+                                   k0RttDataLen));  // 0-RTT write.
+  EXPECT_TRUE(capture_early_data->captured());
+
+  // Send the HelloRetryRequest
+  auto hrr_capture =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeHelloRetryRequest);
+  server_->SetPacketFilter(hrr_capture);
+  server_->Handshake();
+  EXPECT_LT(0U, hrr_capture->buffer().len());
+
+  // The server can't read
+  std::vector<uint8_t> buf(k0RttDataLen);
+  EXPECT_EQ(SECFailure, PR_Read(server_->ssl_fd(), buf.data(), k0RttDataLen));
+  EXPECT_EQ(PR_WOULD_BLOCK_ERROR, PORT_GetError());
+
+  // Make a new capture for the early data.
+  capture_early_data = new TlsExtensionCapture(ssl_tls13_early_data_xtn);
+  client_->SetPacketFilter(capture_early_data);
+
+  // Complete the handshake successfully
+  Handshake();
+  ExpectEarlyDataAccepted(false);  // The server should reject 0-RTT
+  CheckConnected();
+  SendReceive();
+  EXPECT_FALSE(capture_early_data->captured());
+}
+
+class KeyShareReplayer : public TlsExtensionFilter {
+ public:
+  KeyShareReplayer() {}
+
+  virtual PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) {
+    if (extension_type != ssl_tls13_key_share_xtn) {
+      return KEEP;
+    }
+
+    if (!data_.len()) {
+      data_ = input;
+      return KEEP;
+    }
+
+    *output = data_;
+    return CHANGE;
+  }
+
+ private:
+  DataBuffer data_;
+};
+
+// This forces a HelloRetryRequest by disabling P-256 on the server.  However,
+// the second ClientHello is modified so that it omits the requested share.  The
+// server should reject this.
+TEST_P(TlsConnectTls13, RetryWithSameKeyShare) {
+  EnsureTlsSetup();
+  client_->SetPacketFilter(new KeyShareReplayer());
+  static const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_secp384r1,
+                                                    ssl_grp_ec_secp521r1};
+  server_->ConfigNamedGroups(groups);
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_BAD_2ND_CLIENT_HELLO, server_->error_code());
+  EXPECT_EQ(SSL_ERROR_ILLEGAL_PARAMETER_ALERT, client_->error_code());
+}
+
+// This tests that the second attempt at sending a ClientHello (after receiving
+// a HelloRetryRequest) is correctly retransmitted.
+TEST_F(TlsConnectDatagram13, DropClientSecondFlightWithHelloRetry) {
+  static const std::vector<SSLNamedGroup> groups = {ssl_grp_ec_secp384r1,
+                                                    ssl_grp_ec_secp521r1};
+  server_->ConfigNamedGroups(groups);
+  server_->SetPacketFilter(new SelectiveDropFilter(0x2));
+  Connect();
+}
+
+class TlsKeyExchange13 : public TlsKeyExchangeTest {};
+
+// This should work, with an HRR, because the server prefers x25519 and the
+// client generates a share for P-384 on the initial ClientHello.
+TEST_P(TlsKeyExchange13, ConnectEcdhePreferenceMismatchHrr) {
+  EnsureKeyShareSetup();
+  static const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_curve25519};
+  static const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ec_secp384r1};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+  Connect();
+  CheckKeys();
+  static const std::vector<SSLNamedGroup> expectedShares = {
+      ssl_grp_ec_secp384r1};
+  CheckKEXDetails(client_groups, expectedShares, ssl_grp_ec_curve25519);
+}
+
+// This should work, but not use HRR because the key share for x25519 was
+// pre-generated by the client.
+TEST_P(TlsKeyExchange13, ConnectEcdhePreferenceMismatchHrrExtraShares) {
+  EnsureKeyShareSetup();
+  static const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_curve25519};
+  static const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ec_secp384r1};
+  client_->ConfigNamedGroups(client_groups);
+  server_->ConfigNamedGroups(server_groups);
+  EXPECT_EQ(SECSuccess, SSL_SendAdditionalKeyShares(client_->ssl_fd(), 1));
+
+  Connect();
+  CheckKeys();
+  CheckKEXDetails(client_groups, client_groups);
+}
+
+TEST_F(TlsConnectTest, Select12AfterHelloRetryRequest) {
+  EnsureTlsSetup();
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  static const std::vector<SSLNamedGroup> client_groups = {
+      ssl_grp_ec_secp256r1, ssl_grp_ec_secp521r1};
+  client_->ConfigNamedGroups(client_groups);
+  static const std::vector<SSLNamedGroup> server_groups = {
+      ssl_grp_ec_secp384r1, ssl_grp_ec_secp521r1};
+  server_->ConfigNamedGroups(server_groups);
+  client_->StartConnect();
+  server_->StartConnect();
+
+  client_->Handshake();
+  server_->Handshake();
+
+  // Here we replace the TLS server with one that does TLS 1.2 only.
+  // This will happily send the client a TLS 1.2 ServerHello.
+  TlsAgent* replacement_server =
+      new TlsAgent(server_->name(), TlsAgent::SERVER, mode_);
+  delete server_;
+  server_ = replacement_server;
+  server_->Init();
+  client_->SetPeer(server_);
+  server_->SetPeer(client_);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  server_->StartConnect();
+  Handshake();
+  EXPECT_EQ(SSL_ERROR_ILLEGAL_PARAMETER_ALERT, server_->error_code());
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_SERVER_HELLO, client_->error_code());
+}
+
+class HelloRetryRequestAgentTest : public TlsAgentTestClient {
+ protected:
+  void SetUp() override {
+    TlsAgentTestClient::SetUp();
+    EnsureInit();
+    agent_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_3,
+                            SSL_LIBRARY_VERSION_TLS_1_3);
+    agent_->StartConnect();
+  }
+
+  void MakeCannedHrr(const uint8_t* body, size_t len, DataBuffer* hrr_record,
+                     uint32_t seq_num = 0) const {
+    DataBuffer hrr_data;
+    hrr_data.Allocate(len + 4);
+    size_t i = 0;
+    i = hrr_data.Write(i, 0x7f00 | TLS_1_3_DRAFT_VERSION, 2);
+    i = hrr_data.Write(i, static_cast<uint32_t>(len), 2);
+    if (len) {
+      hrr_data.Write(i, body, len);
+    }
+    DataBuffer hrr;
+    MakeHandshakeMessage(kTlsHandshakeHelloRetryRequest, hrr_data.data(),
+                         hrr_data.len(), &hrr, seq_num);
+    MakeRecord(kTlsHandshakeType, SSL_LIBRARY_VERSION_TLS_1_3, hrr.data(),
+               hrr.len(), hrr_record, seq_num);
+  }
+
+  void MakeGroupHrr(SSLNamedGroup group, DataBuffer* hrr_record,
+                    uint32_t seq_num = 0) const {
+    const uint8_t group_hrr[] = {
+        static_cast<uint8_t>(ssl_tls13_key_share_xtn >> 8),
+        static_cast<uint8_t>(ssl_tls13_key_share_xtn),
+        0,
+        2,  // length of key share extension
+        static_cast<uint8_t>(group >> 8),
+        static_cast<uint8_t>(group)};
+    MakeCannedHrr(group_hrr, sizeof(group_hrr), hrr_record, seq_num);
+  }
+};
+
+// Send two HelloRetryRequest messages in response to the ClientHello.  The are
+// constructed to appear legitimate by asking for a new share in each, so that
+// the client has to count to work out that the server is being unreasonable.
+TEST_P(HelloRetryRequestAgentTest, SendSecondHelloRetryRequest) {
+  DataBuffer hrr;
+  MakeGroupHrr(ssl_grp_ec_secp384r1, &hrr, 0);
+  ProcessMessage(hrr, TlsAgent::STATE_CONNECTING);
+  MakeGroupHrr(ssl_grp_ec_secp521r1, &hrr, 1);
+  ProcessMessage(hrr, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_UNEXPECTED_HELLO_RETRY_REQUEST);
+}
+
+// Here the client receives a HelloRetryRequest with a group that they already
+// provided a share for.
+TEST_P(HelloRetryRequestAgentTest, HandleBogusHelloRetryRequest) {
+  DataBuffer hrr;
+  MakeGroupHrr(ssl_grp_ec_curve25519, &hrr);
+  ProcessMessage(hrr, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST);
+}
+
+TEST_P(HelloRetryRequestAgentTest, HandleNoopHelloRetryRequest) {
+  DataBuffer hrr;
+  MakeCannedHrr(nullptr, 0U, &hrr);
+  ProcessMessage(hrr, TlsAgent::STATE_ERROR,
+                 SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST);
+}
+
+TEST_P(HelloRetryRequestAgentTest, HandleHelloRetryRequestCookie) {
+  const uint8_t canned_cookie_hrr[] = {
+      static_cast<uint8_t>(ssl_tls13_cookie_xtn >> 8),
+      static_cast<uint8_t>(ssl_tls13_cookie_xtn),
+      0,
+      5,  // length of cookie extension
+      0,
+      3,  // cookie value length
+      0xc0,
+      0x0c,
+      0x13};
+  DataBuffer hrr;
+  MakeCannedHrr(canned_cookie_hrr, sizeof(canned_cookie_hrr), &hrr);
+  TlsExtensionCapture* capture = new TlsExtensionCapture(ssl_tls13_cookie_xtn);
+  agent_->SetPacketFilter(capture);
+  ProcessMessage(hrr, TlsAgent::STATE_CONNECTING);
+  const size_t cookie_pos = 2 + 2;  // cookie_xtn, extension len
+  DataBuffer cookie(canned_cookie_hrr + cookie_pos,
+                    sizeof(canned_cookie_hrr) - cookie_pos);
+  EXPECT_EQ(cookie, capture->extension());
+}
+
+INSTANTIATE_TEST_CASE_P(HelloRetryRequestAgentTests, HelloRetryRequestAgentTest,
+                        TlsConnectTestBase::kTlsModesAll);
+#ifndef NSS_DISABLE_TLS_1_3
+INSTANTIATE_TEST_CASE_P(HelloRetryRequestKeyExchangeTests, TlsKeyExchange13,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV13));
+#endif
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_loopback_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_loopback_unittest.cc
new file mode 100644
index 0000000000..65c0ca1f89
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_loopback_unittest.cc
@@ -0,0 +1,274 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectGeneric, SetupOnly) {}
+
+TEST_P(TlsConnectGeneric, Connect) {
+  SetExpectedVersion(std::get<1>(GetParam()));
+  Connect();
+  CheckKeys();
+}
+
+TEST_P(TlsConnectGeneric, ConnectEcdsa) {
+  SetExpectedVersion(std::get<1>(GetParam()));
+  Reset(TlsAgent::kServerEcdsa256);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_auth_ecdsa);
+}
+
+TEST_P(TlsConnectGenericPre13, CipherSuiteMismatch) {
+  EnsureTlsSetup();
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    client_->EnableSingleCipher(TLS_AES_128_GCM_SHA256);
+    server_->EnableSingleCipher(TLS_AES_256_GCM_SHA384);
+  } else {
+    client_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+    server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA);
+  }
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+  server_->CheckErrorCode(SSL_ERROR_NO_CYPHER_OVERLAP);
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectFalseStart) {
+  client_->EnableFalseStart();
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectAlpn) {
+  EnableAlpn();
+  Connect();
+  CheckAlpn("a");
+}
+
+TEST_P(TlsConnectGeneric, ConnectAlpnClone) {
+  EnsureModelSockets();
+  client_model_->EnableAlpn(alpn_dummy_val_, sizeof(alpn_dummy_val_));
+  server_model_->EnableAlpn(alpn_dummy_val_, sizeof(alpn_dummy_val_));
+  Connect();
+  CheckAlpn("a");
+}
+
+TEST_P(TlsConnectDatagram, ConnectSrtp) {
+  EnableSrtp();
+  Connect();
+  CheckSrtp();
+  SendReceive();
+}
+
+// 1.3 is disabled in the next few tests because we don't
+// presently support resumption in 1.3.
+TEST_P(TlsConnectStreamPre13, ConnectAndClientRenegotiate) {
+  Connect();
+  server_->PrepareForRenegotiate();
+  client_->StartRenegotiate();
+  Handshake();
+  CheckConnected();
+}
+
+TEST_P(TlsConnectStreamPre13, ConnectAndServerRenegotiate) {
+  Connect();
+  client_->PrepareForRenegotiate();
+  server_->StartRenegotiate();
+  Handshake();
+  CheckConnected();
+}
+
+TEST_P(TlsConnectGeneric, ConnectSendReceive) {
+  Connect();
+  SendReceive();
+}
+
+// The next two tests takes advantage of the fact that we
+// automatically read the first 1024 bytes, so if
+// we provide 1200 bytes, they overrun the read buffer
+// provided by the calling test.
+
+// DTLS should return an error.
+TEST_P(TlsConnectDatagram, ShortRead) {
+  Connect();
+  client_->ExpectReadWriteError();
+  server_->SendData(1200, 1200);
+  client_->WaitForErrorCode(SSL_ERROR_RX_SHORT_DTLS_READ, 2000);
+
+  // Now send and receive another packet.
+  server_->ResetSentBytes();  // Reset the counter.
+  SendReceive();
+}
+
+// TLS should get the write in two chunks.
+TEST_P(TlsConnectStream, ShortRead) {
+  // This test behaves oddly with TLS 1.0 because of 1/n+1 splitting,
+  // so skip in that case.
+  if (version_ < SSL_LIBRARY_VERSION_TLS_1_1) return;
+
+  Connect();
+  server_->SendData(1200, 1200);
+  // Read the first tranche.
+  WAIT_(client_->received_bytes() == 1024, 2000);
+  ASSERT_EQ(1024U, client_->received_bytes());
+  // The second tranche should now immediately be available.
+  client_->ReadBytes();
+  ASSERT_EQ(1200U, client_->received_bytes());
+}
+
+TEST_P(TlsConnectGeneric, ConnectWithCompressionMaybe) {
+  EnsureTlsSetup();
+  client_->EnableCompression();
+  server_->EnableCompression();
+  Connect();
+  EXPECT_EQ(client_->version() < SSL_LIBRARY_VERSION_TLS_1_3 && mode_ != DGRAM,
+            client_->is_compressed());
+  SendReceive();
+}
+
+TEST_P(TlsConnectDatagram, TestDtlsHolddownExpiry) {
+  Connect();
+  std::cerr << "Expiring holddown timer\n";
+  SSLInt_ForceTimerExpiry(client_->ssl_fd());
+  SSLInt_ForceTimerExpiry(server_->ssl_fd());
+  SendReceive();
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    // One for send, one for receive.
+    EXPECT_EQ(2, SSLInt_CountTls13CipherSpecs(client_->ssl_fd()));
+  }
+}
+
+class TlsPreCCSHeaderInjector : public TlsRecordFilter {
+ public:
+  TlsPreCCSHeaderInjector() {}
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& record_header,
+                                            const DataBuffer& input,
+                                            size_t* offset,
+                                            DataBuffer* output) override {
+    if (record_header.content_type() != kTlsChangeCipherSpecType) return KEEP;
+
+    std::cerr << "Injecting Finished header before CCS\n";
+    const uint8_t hhdr[] = {kTlsHandshakeFinished, 0x00, 0x00, 0x0c};
+    DataBuffer hhdr_buf(hhdr, sizeof(hhdr));
+    RecordHeader nhdr(record_header.version(), kTlsHandshakeType, 0);
+    *offset = nhdr.Write(output, *offset, hhdr_buf);
+    *offset = record_header.Write(output, *offset, input);
+    return CHANGE;
+  }
+};
+
+TEST_P(TlsConnectStreamPre13, ClientFinishedHeaderBeforeCCS) {
+  client_->SetPacketFilter(new TlsPreCCSHeaderInjector());
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT);
+  server_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER);
+}
+
+TEST_P(TlsConnectStreamPre13, ServerFinishedHeaderBeforeCCS) {
+  server_->SetPacketFilter(new TlsPreCCSHeaderInjector());
+  client_->StartConnect();
+  server_->StartConnect();
+  Handshake();
+  EXPECT_EQ(TlsAgent::STATE_ERROR, client_->state());
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER);
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, server_->state());
+}
+
+TEST_P(TlsConnectTls13, UnknownAlert) {
+  Connect();
+  SSLInt_SendAlert(server_->ssl_fd(), kTlsAlertWarning,
+                   0xff);  // Unknown value.
+  client_->ExpectReadWriteError();
+  client_->WaitForErrorCode(SSL_ERROR_RX_UNKNOWN_ALERT, 2000);
+}
+
+TEST_P(TlsConnectTls13, AlertWrongLevel) {
+  Connect();
+  SSLInt_SendAlert(server_->ssl_fd(), kTlsAlertWarning,
+                   kTlsAlertUnexpectedMessage);
+  client_->ExpectReadWriteError();
+  client_->WaitForErrorCode(SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT, 2000);
+}
+
+TEST_F(TlsConnectStreamTls13, NegotiateShortHeaders) {
+  client_->SetShortHeadersEnabled();
+  server_->SetShortHeadersEnabled();
+  client_->ExpectShortHeaders();
+  server_->ExpectShortHeaders();
+  Connect();
+}
+
+TEST_F(TlsConnectStreamTls13, Tls13FailedWriteSecondFlight) {
+  EnsureTlsSetup();
+  client_->StartConnect();
+  server_->StartConnect();
+  client_->Handshake();
+  server_->Handshake();  // Send first flight.
+  client_->adapter()->CloseWrites();
+  client_->Handshake();  // This will get an error, but shouldn't crash.
+  client_->CheckErrorCode(SSL_ERROR_SOCKET_WRITE_FAILURE);
+}
+
+INSTANTIATE_TEST_CASE_P(GenericStream, TlsConnectGeneric,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsVAll));
+INSTANTIATE_TEST_CASE_P(
+    GenericDatagram, TlsConnectGeneric,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesDatagram,
+                       TlsConnectTestBase::kTlsV11Plus));
+
+INSTANTIATE_TEST_CASE_P(StreamOnly, TlsConnectStream,
+                        TlsConnectTestBase::kTlsVAll);
+INSTANTIATE_TEST_CASE_P(DatagramOnly, TlsConnectDatagram,
+                        TlsConnectTestBase::kTlsV11Plus);
+
+INSTANTIATE_TEST_CASE_P(Pre12Stream, TlsConnectPre12,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsV10V11));
+INSTANTIATE_TEST_CASE_P(
+    Pre12Datagram, TlsConnectPre12,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesDatagram,
+                       TlsConnectTestBase::kTlsV11));
+
+INSTANTIATE_TEST_CASE_P(Version12Only, TlsConnectTls12,
+                        TlsConnectTestBase::kTlsModesAll);
+#ifndef NSS_DISABLE_TLS_1_3
+INSTANTIATE_TEST_CASE_P(Version13Only, TlsConnectTls13,
+                        TlsConnectTestBase::kTlsModesAll);
+#endif
+
+INSTANTIATE_TEST_CASE_P(Pre13Stream, TlsConnectGenericPre13,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsV10ToV12));
+INSTANTIATE_TEST_CASE_P(
+    Pre13Datagram, TlsConnectGenericPre13,
+    ::testing::Combine(TlsConnectTestBase::kTlsModesDatagram,
+                       TlsConnectTestBase::kTlsV11V12));
+INSTANTIATE_TEST_CASE_P(Pre13StreamOnly, TlsConnectStreamPre13,
+                        TlsConnectTestBase::kTlsV10ToV12);
+
+INSTANTIATE_TEST_CASE_P(Version12Plus, TlsConnectTls12Plus,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV12Plus));
+
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_record_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_record_unittest.cc
new file mode 100644
index 0000000000..ef81b222c8
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_record_unittest.cc
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nss.h"
+#include "ssl.h"
+#include "sslimpl.h"
+
+#include "databuffer.h"
+#include "gtest_utils.h"
+
+namespace nss_test {
+
+const static size_t kMacSize = 20;
+
+class TlsPaddingTest
+    : public ::testing::Test,
+      public ::testing::WithParamInterface<std::tuple<size_t, bool>> {
+ public:
+  TlsPaddingTest() : plaintext_len_(std::get<0>(GetParam())) {
+    size_t extra =
+        (plaintext_len_ + 1) % 16;  // Bytes past a block (1 == pad len)
+    // Minimal padding.
+    pad_len_ = extra ? 16 - extra : 0;
+    if (std::get<1>(GetParam())) {
+      // Maximal padding.
+      pad_len_ += 240;
+    }
+    MakePaddedPlaintext();
+  }
+
+  // Makes a plaintext record with correct padding.
+  void MakePaddedPlaintext() {
+    EXPECT_EQ(0UL, (plaintext_len_ + pad_len_ + 1) % 16);
+    size_t i = 0;
+    plaintext_.Allocate(plaintext_len_ + pad_len_ + 1);
+    for (; i < plaintext_len_; ++i) {
+      plaintext_.Write(i, 'A', 1);
+    }
+
+    for (; i < plaintext_len_ + pad_len_ + 1; ++i) {
+      plaintext_.Write(i, pad_len_, 1);
+    }
+  }
+
+  void Unpad(bool expect_success) {
+    std::cerr << "Content length=" << plaintext_len_
+              << " padding length=" << pad_len_
+              << " total length=" << plaintext_.len() << std::endl;
+    std::cerr << "Plaintext: " << plaintext_ << std::endl;
+    sslBuffer s;
+    s.buf = const_cast<unsigned char *>(
+        static_cast<const unsigned char *>(plaintext_.data()));
+    s.len = plaintext_.len();
+    SECStatus rv = ssl_RemoveTLSCBCPadding(&s, kMacSize);
+    if (expect_success) {
+      EXPECT_EQ(SECSuccess, rv);
+      EXPECT_EQ(plaintext_len_, static_cast<size_t>(s.len));
+    } else {
+      EXPECT_EQ(SECFailure, rv);
+    }
+  }
+
+ protected:
+  size_t plaintext_len_;
+  size_t pad_len_;
+  DataBuffer plaintext_;
+};
+
+TEST_P(TlsPaddingTest, Correct) {
+  if (plaintext_len_ >= kMacSize) {
+    Unpad(true);
+  } else {
+    Unpad(false);
+  }
+}
+
+TEST_P(TlsPaddingTest, PadTooLong) {
+  if (plaintext_.len() < 255) {
+    plaintext_.Write(plaintext_.len() - 1, plaintext_.len(), 1);
+    Unpad(false);
+  }
+}
+
+TEST_P(TlsPaddingTest, FirstByteOfPadWrong) {
+  if (pad_len_) {
+    plaintext_.Write(plaintext_len_, plaintext_.data()[plaintext_len_] + 1, 1);
+    Unpad(false);
+  }
+}
+
+TEST_P(TlsPaddingTest, LastByteOfPadWrong) {
+  if (pad_len_) {
+    plaintext_.Write(plaintext_.len() - 2,
+                     plaintext_.data()[plaintext_.len() - 1] + 1, 1);
+    Unpad(false);
+  }
+}
+
+const static size_t kContentSizesArr[] = {
+    1, kMacSize - 1, kMacSize, 30, 31, 32, 36, 256, 257, 287, 288};
+
+auto kContentSizes = ::testing::ValuesIn(kContentSizesArr);
+const static bool kTrueFalseArr[] = {true, false};
+auto kTrueFalse = ::testing::ValuesIn(kTrueFalseArr);
+
+INSTANTIATE_TEST_CASE_P(TlsPadding, TlsPaddingTest,
+                        ::testing::Combine(kContentSizes, kTrueFalse));
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_resumption_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_resumption_unittest.cc
new file mode 100644
index 0000000000..cfe42cb9fa
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_resumption_unittest.cc
@@ -0,0 +1,582 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+class TlsServerKeyExchangeEcdhe {
+ public:
+  bool Parse(const DataBuffer& buffer) {
+    TlsParser parser(buffer);
+
+    uint8_t curve_type;
+    if (!parser.Read(&curve_type)) {
+      return false;
+    }
+
+    if (curve_type != 3) {  // named_curve
+      return false;
+    }
+
+    uint32_t named_curve;
+    if (!parser.Read(&named_curve, 2)) {
+      return false;
+    }
+
+    return parser.ReadVariable(&public_key_, 1);
+  }
+
+  DataBuffer public_key_;
+};
+
+TEST_P(TlsConnectGenericPre13, ConnectResumed) {
+  ConfigureSessionCache(RESUME_SESSIONID, RESUME_SESSIONID);
+  Connect();
+
+  Reset();
+  ExpectResumption(RESUME_SESSIONID);
+  Connect();
+}
+
+TEST_P(TlsConnectGeneric, ConnectClientCacheDisabled) {
+  ConfigureSessionCache(RESUME_NONE, RESUME_SESSIONID);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectServerCacheDisabled) {
+  ConfigureSessionCache(RESUME_SESSIONID, RESUME_NONE);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectSessionCacheDisabled) {
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeSupportBoth) {
+  // This prefers tickets.
+  ConfigureSessionCache(RESUME_BOTH, RESUME_BOTH);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_BOTH);
+  ExpectResumption(RESUME_TICKET);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeClientTicketServerBoth) {
+  // This causes no resumption because the client needs the
+  // session cache to resume even with tickets.
+  ConfigureSessionCache(RESUME_TICKET, RESUME_BOTH);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ConfigureSessionCache(RESUME_TICKET, RESUME_BOTH);
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeClientBothTicketServerTicket) {
+  // This causes a ticket resumption.
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ExpectResumption(RESUME_TICKET);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeClientServerTicketOnly) {
+  // This causes no resumption because the client needs the
+  // session cache to resume even with tickets.
+  ConfigureSessionCache(RESUME_TICKET, RESUME_TICKET);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ConfigureSessionCache(RESUME_TICKET, RESUME_TICKET);
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeClientBothServerNone) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_NONE);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_NONE);
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeClientNoneServerBoth) {
+  ConfigureSessionCache(RESUME_NONE, RESUME_BOTH);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ConfigureSessionCache(RESUME_NONE, RESUME_BOTH);
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+TEST_P(TlsConnectGenericPre13, ConnectResumeWithHigherVersion) {
+  ConfigureSessionCache(RESUME_SESSIONID, RESUME_SESSIONID);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_1);
+  SetExpectedVersion(SSL_LIBRARY_VERSION_TLS_1_1);
+  Connect();
+
+  Reset();
+  EnsureTlsSetup();
+  SetExpectedVersion(SSL_LIBRARY_VERSION_TLS_1_2);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  ExpectResumption(RESUME_NONE);
+  Connect();
+}
+
+TEST_P(TlsConnectGeneric, ConnectResumeClientBothTicketServerTicketForget) {
+  // This causes a ticket resumption.
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  Connect();
+  SendReceive();
+
+  Reset();
+  ClearServerCache();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ExpectResumption(RESUME_NONE);
+  Connect();
+  SendReceive();
+}
+
+// This callback switches out the "server" cert used on the server with
+// the "client" certificate, which should be the same type.
+static int32_t SwitchCertificates(TlsAgent* agent, const SECItem* srvNameArr,
+                                  uint32_t srvNameArrSize) {
+  bool ok = agent->ConfigServerCert("client");
+  if (!ok) return SSL_SNI_SEND_ALERT;
+
+  return 0;  // first config
+};
+
+TEST_P(TlsConnectGeneric, ServerSNICertSwitch) {
+  Connect();
+  ScopedCERTCertificate cert1(SSL_PeerCertificate(client_->ssl_fd()));
+
+  Reset();
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+
+  server_->SetSniCallback(SwitchCertificates);
+
+  Connect();
+  ScopedCERTCertificate cert2(SSL_PeerCertificate(client_->ssl_fd()));
+  CheckKeys();
+  EXPECT_FALSE(SECITEM_ItemsAreEqual(&cert1->derCert, &cert2->derCert));
+}
+
+TEST_P(TlsConnectGeneric, ServerSNICertTypeSwitch) {
+  Reset(TlsAgent::kServerEcdsa256);
+  Connect();
+  ScopedCERTCertificate cert1(SSL_PeerCertificate(client_->ssl_fd()));
+
+  Reset();
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+
+  // Because we configure an RSA certificate here, it only adds a second, unused
+  // certificate, which has no effect on what the server uses.
+  server_->SetSniCallback(SwitchCertificates);
+
+  Connect();
+  ScopedCERTCertificate cert2(SSL_PeerCertificate(client_->ssl_fd()));
+  CheckKeys(ssl_kea_ecdh, ssl_auth_ecdsa);
+  EXPECT_TRUE(SECITEM_ItemsAreEqual(&cert1->derCert, &cert2->derCert));
+}
+
+// Prior to TLS 1.3, we were not fully ephemeral; though 1.3 fixes that
+TEST_P(TlsConnectGenericPre13, ConnectEcdheTwiceReuseKey) {
+  TlsInspectorRecordHandshakeMessage* i1 =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerKeyExchange);
+  server_->SetPacketFilter(i1);
+  Connect();
+  CheckKeys();
+  TlsServerKeyExchangeEcdhe dhe1;
+  EXPECT_TRUE(dhe1.Parse(i1->buffer()));
+
+  // Restart
+  Reset();
+  TlsInspectorRecordHandshakeMessage* i2 =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerKeyExchange);
+  server_->SetPacketFilter(i2);
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+  Connect();
+  CheckKeys();
+
+  TlsServerKeyExchangeEcdhe dhe2;
+  EXPECT_TRUE(dhe2.Parse(i2->buffer()));
+
+  // Make sure they are the same.
+  EXPECT_EQ(dhe1.public_key_.len(), dhe2.public_key_.len());
+  EXPECT_TRUE(!memcmp(dhe1.public_key_.data(), dhe2.public_key_.data(),
+                      dhe1.public_key_.len()));
+}
+
+// This test parses the ServerKeyExchange, which isn't in 1.3
+TEST_P(TlsConnectGenericPre13, ConnectEcdheTwiceNewKey) {
+  server_->EnsureTlsSetup();
+  SECStatus rv =
+      SSL_OptionSet(server_->ssl_fd(), SSL_REUSE_SERVER_ECDHE_KEY, PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+  TlsInspectorRecordHandshakeMessage* i1 =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerKeyExchange);
+  server_->SetPacketFilter(i1);
+  Connect();
+  CheckKeys();
+  TlsServerKeyExchangeEcdhe dhe1;
+  EXPECT_TRUE(dhe1.Parse(i1->buffer()));
+
+  // Restart
+  Reset();
+  server_->EnsureTlsSetup();
+  rv = SSL_OptionSet(server_->ssl_fd(), SSL_REUSE_SERVER_ECDHE_KEY, PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+  TlsInspectorRecordHandshakeMessage* i2 =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerKeyExchange);
+  server_->SetPacketFilter(i2);
+  ConfigureSessionCache(RESUME_NONE, RESUME_NONE);
+  Connect();
+  CheckKeys();
+
+  TlsServerKeyExchangeEcdhe dhe2;
+  EXPECT_TRUE(dhe2.Parse(i2->buffer()));
+
+  // Make sure they are different.
+  EXPECT_FALSE((dhe1.public_key_.len() == dhe2.public_key_.len()) &&
+               (!memcmp(dhe1.public_key_.data(), dhe2.public_key_.data(),
+                        dhe1.public_key_.len())));
+}
+
+// Verify that TLS 1.3 reports an accurate group on resumption.
+TEST_P(TlsConnectTls13, TestTls13ResumeDifferentGroup) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ExpectResumption(RESUME_TICKET);
+  client_->ConfigNamedGroups(kFFDHEGroups);
+  server_->ConfigNamedGroups(kFFDHEGroups);
+  Connect();
+  CheckKeys(ssl_kea_dh, ssl_grp_ffdhe_2048, ssl_auth_rsa_sign, ssl_sig_none);
+}
+
+// We need to enable different cipher suites at different times in the following
+// tests.  Those cipher suites need to be suited to the version.
+static uint16_t ChooseOneCipher(uint16_t version) {
+  if (version >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    return TLS_AES_128_GCM_SHA256;
+  }
+  return TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA;
+}
+
+static uint16_t ChooseAnotherCipher(uint16_t version) {
+  if (version >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    return TLS_AES_256_GCM_SHA384;
+  }
+  return TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA;
+}
+
+// Test that we don't resume when we can't negotiate the same cipher.
+TEST_P(TlsConnectGeneric, TestResumeClientDifferentCipher) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  client_->EnableSingleCipher(ChooseOneCipher(version_));
+  Connect();
+  SendReceive();
+  CheckKeys(ssl_kea_ecdh, ssl_auth_rsa_sign);
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ExpectResumption(RESUME_NONE);
+  client_->EnableSingleCipher(ChooseAnotherCipher(version_));
+  uint16_t ticket_extension;
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    ticket_extension = ssl_tls13_pre_shared_key_xtn;
+  } else {
+    ticket_extension = ssl_session_ticket_xtn;
+  }
+  auto ticket_capture = new TlsExtensionCapture(ticket_extension);
+  client_->SetPacketFilter(ticket_capture);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_auth_rsa_sign);
+  EXPECT_EQ(0U, ticket_capture->extension().len());
+}
+
+// Test that we don't resume when we can't negotiate the same cipher.
+TEST_P(TlsConnectGeneric, TestResumeServerDifferentCipher) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  server_->EnableSingleCipher(ChooseOneCipher(version_));
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys();
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ExpectResumption(RESUME_NONE);
+  server_->EnableSingleCipher(ChooseAnotherCipher(version_));
+  Connect();
+  CheckKeys();
+}
+
+class SelectedCipherSuiteReplacer : public TlsHandshakeFilter {
+ public:
+  SelectedCipherSuiteReplacer(uint16_t suite) : cipher_suite_(suite) {}
+
+ protected:
+  PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                       const DataBuffer& input,
+                                       DataBuffer* output) override {
+    if (header.handshake_type() != kTlsHandshakeServerHello) {
+      return KEEP;
+    }
+
+    *output = input;
+    uint32_t temp = 0;
+    EXPECT_TRUE(input.Read(0, 2, &temp));
+    // Cipher suite is after version(2) and random(32).
+    size_t pos = 34;
+    if (temp < SSL_LIBRARY_VERSION_TLS_1_3) {
+      // In old versions, we have to skip a session_id too.
+      EXPECT_TRUE(input.Read(pos, 1, &temp));
+      pos += 1 + temp;
+    }
+    output->Write(pos, static_cast<uint32_t>(cipher_suite_), 2);
+    return CHANGE;
+  }
+
+ private:
+  uint16_t cipher_suite_;
+};
+
+// Test that the client doesn't tolerate the server picking a different cipher
+// suite for resumption.
+TEST_P(TlsConnectStream, TestResumptionOverrideCipher) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  server_->EnableSingleCipher(ChooseOneCipher(version_));
+  Connect();
+  SendReceive();
+  CheckKeys(ssl_kea_ecdh, ssl_auth_rsa_sign);
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  server_->SetPacketFilter(
+      new SelectedCipherSuiteReplacer(ChooseAnotherCipher(version_)));
+
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    // The reason this test is stream only: the server is unable to decrypt
+    // the alert that the client sends, see bug 1304603.
+    server_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
+  } else {
+    server_->CheckErrorCode(SSL_ERROR_HANDSHAKE_FAILURE_ALERT);
+  }
+}
+
+class SelectedVersionReplacer : public TlsHandshakeFilter {
+ public:
+  SelectedVersionReplacer(uint16_t version) : version_(version) {}
+
+ protected:
+  PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                       const DataBuffer& input,
+                                       DataBuffer* output) override {
+    if (header.handshake_type() != kTlsHandshakeServerHello) {
+      return KEEP;
+    }
+
+    *output = input;
+    output->Write(0, static_cast<uint32_t>(version_), 2);
+    return CHANGE;
+  }
+
+ private:
+  uint16_t version_;
+};
+
+// Test how the client handles the case where the server picks a
+// lower version number on resumption.
+TEST_P(TlsConnectGenericPre13, TestResumptionOverrideVersion) {
+  uint16_t override_version = 0;
+  if (mode_ == STREAM) {
+    switch (version_) {
+      case SSL_LIBRARY_VERSION_TLS_1_0:
+        return;  // Skip the test.
+      case SSL_LIBRARY_VERSION_TLS_1_1:
+        override_version = SSL_LIBRARY_VERSION_TLS_1_0;
+        break;
+      case SSL_LIBRARY_VERSION_TLS_1_2:
+        override_version = SSL_LIBRARY_VERSION_TLS_1_1;
+        break;
+      default:
+        ASSERT_TRUE(false) << "unknown version";
+    }
+  } else {
+    if (version_ == SSL_LIBRARY_VERSION_TLS_1_2) {
+      override_version = SSL_LIBRARY_VERSION_DTLS_1_0_WIRE;
+    } else {
+      ASSERT_EQ(SSL_LIBRARY_VERSION_TLS_1_1, version_);
+      return;  // Skip the test.
+    }
+  }
+
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  // Need to use a cipher that is plausible for the lower version.
+  server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+  Connect();
+  CheckKeys(ssl_kea_ecdh, ssl_auth_rsa_sign);
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  // Enable the lower version on the client.
+  client_->SetVersionRange(version_ - 1, version_);
+  server_->EnableSingleCipher(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+  server_->SetPacketFilter(new SelectedVersionReplacer(override_version));
+
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
+  server_->CheckErrorCode(SSL_ERROR_HANDSHAKE_FAILURE_ALERT);
+}
+
+// Test that two TLS resumptions work and produce the same ticket.
+// This will change after bug 1257047 is fixed.
+TEST_F(TlsConnectTest, TestTls13ResumptionTwice) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys();
+  uint16_t original_suite;
+  EXPECT_TRUE(client_->cipher_suite(&original_suite));
+
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  ExpectResumption(RESUME_TICKET);
+  TlsExtensionCapture* c1 =
+      new TlsExtensionCapture(ssl_tls13_pre_shared_key_xtn);
+  client_->SetPacketFilter(c1);
+  Connect();
+  SendReceive();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, ssl_auth_rsa_sign,
+            ssl_sig_none);
+  // The filter will go away when we reset, so save the captured extension.
+  DataBuffer initialTicket(c1->extension());
+  ASSERT_LT(0U, initialTicket.len());
+
+  ScopedCERTCertificate cert1(SSL_PeerCertificate(client_->ssl_fd()));
+  ASSERT_TRUE(!!cert1.get());
+
+  Reset();
+  ClearStats();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  TlsExtensionCapture* c2 =
+      new TlsExtensionCapture(ssl_tls13_pre_shared_key_xtn);
+  client_->SetPacketFilter(c2);
+  ExpectResumption(RESUME_TICKET);
+  Connect();
+  SendReceive();
+  CheckKeys(ssl_kea_ecdh, ssl_grp_ec_curve25519, ssl_auth_rsa_sign,
+            ssl_sig_none);
+  ASSERT_LT(0U, c2->extension().len());
+
+  ScopedCERTCertificate cert2(SSL_PeerCertificate(client_->ssl_fd()));
+  ASSERT_TRUE(!!cert2.get());
+
+  // Check that the cipher suite is reported the same on both sides, though in
+  // TLS 1.3 resumption actually negotiates a different cipher suite.
+  uint16_t resumed_suite;
+  EXPECT_TRUE(server_->cipher_suite(&resumed_suite));
+  EXPECT_EQ(original_suite, resumed_suite);
+  EXPECT_TRUE(client_->cipher_suite(&resumed_suite));
+  EXPECT_EQ(original_suite, resumed_suite);
+
+  ASSERT_NE(initialTicket, c2->extension());
+}
+
+// Check that resumption works after receiving two NST messages.
+TEST_F(TlsConnectTest, TestTls13ResumptionDuplicateNST) {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  Connect();
+
+  // Clear the session ticket keys to invalidate the old ticket.
+  SSLInt_ClearSessionTicketKey();
+  SSLInt_SendNewSessionTicket(server_->ssl_fd());
+
+  SendReceive();  // Need to read so that we absorb the session tickets.
+  CheckKeys();
+
+  // Resume the connection.
+  Reset();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  ExpectResumption(RESUME_TICKET);
+  Connect();
+  SendReceive();
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_skip_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_skip_unittest.cc
new file mode 100644
index 0000000000..523a37499a
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_skip_unittest.cc
@@ -0,0 +1,158 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "sslerr.h"
+
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+/*
+ * The tests in this file test that the TLS state machine is robust against
+ * attacks that alter the order of handshake messages.
+ *
+ * See <https://www.smacktls.com/smack.pdf> for a description of the problems
+ * that this sort of attack can enable.
+ */
+namespace nss_test {
+
+class TlsHandshakeSkipFilter : public TlsRecordFilter {
+ public:
+  // A TLS record filter that skips handshake messages of the identified type.
+  TlsHandshakeSkipFilter(uint8_t handshake_type)
+      : handshake_type_(handshake_type), skipped_(false) {}
+
+ protected:
+  // Takes a record; if it is a handshake record, it removes the first handshake
+  // message that is of handshake_type_ type.
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& record_header,
+                                            const DataBuffer& input,
+                                            DataBuffer* output) {
+    if (record_header.content_type() != kTlsHandshakeType) {
+      return KEEP;
+    }
+
+    size_t output_offset = 0U;
+    output->Allocate(input.len());
+
+    TlsParser parser(input);
+    while (parser.remaining()) {
+      size_t start = parser.consumed();
+      TlsHandshakeFilter::HandshakeHeader header;
+      DataBuffer ignored;
+      if (!header.Parse(&parser, record_header, &ignored)) {
+        return KEEP;
+      }
+
+      if (skipped_ || header.handshake_type() != handshake_type_) {
+        size_t entire_length = parser.consumed() - start;
+        output->Write(output_offset, input.data() + start, entire_length);
+        // DTLS sequence numbers need to be rewritten
+        if (skipped_ && header.is_dtls()) {
+          output->data()[start + 5] -= 1;
+        }
+        output_offset += entire_length;
+      } else {
+        std::cerr << "Dropping handshake: "
+                  << static_cast<unsigned>(handshake_type_) << std::endl;
+        // We only need to report that the output contains changed data if we
+        // drop a handshake message.  But once we've skipped one message, we
+        // have to modify all subsequent handshake messages so that they include
+        // the correct DTLS sequence numbers.
+        skipped_ = true;
+      }
+    }
+    output->Truncate(output_offset);
+    return skipped_ ? CHANGE : KEEP;
+  }
+
+ private:
+  // The type of handshake message to drop.
+  uint8_t handshake_type_;
+  // Whether this filter has ever skipped a handshake message.  Track this so
+  // that sequence numbers on DTLS handshake messages can be rewritten in
+  // subsequent calls.
+  bool skipped_;
+};
+
+class TlsSkipTest
+    : public TlsConnectTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ protected:
+  TlsSkipTest()
+      : TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {}
+
+  void ServerSkipTest(PacketFilter* filter,
+                      uint8_t alert = kTlsAlertUnexpectedMessage) {
+    auto alert_recorder = new TlsAlertRecorder();
+    client_->SetPacketFilter(alert_recorder);
+    if (filter) {
+      server_->SetPacketFilter(filter);
+    }
+    ConnectExpectFail();
+    EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+    EXPECT_EQ(alert, alert_recorder->description());
+  }
+};
+
+TEST_P(TlsSkipTest, SkipCertificateRsa) {
+  EnableOnlyStaticRsaCiphers();
+  ServerSkipTest(new TlsHandshakeSkipFilter(kTlsHandshakeCertificate));
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
+}
+
+TEST_P(TlsSkipTest, SkipCertificateDhe) {
+  ServerSkipTest(new TlsHandshakeSkipFilter(kTlsHandshakeCertificate));
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_SERVER_KEY_EXCH);
+}
+
+TEST_P(TlsSkipTest, SkipCertificateEcdhe) {
+  ServerSkipTest(new TlsHandshakeSkipFilter(kTlsHandshakeCertificate));
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_SERVER_KEY_EXCH);
+}
+
+TEST_P(TlsSkipTest, SkipCertificateEcdsa) {
+  Reset(TlsAgent::kServerEcdsa256);
+  ServerSkipTest(new TlsHandshakeSkipFilter(kTlsHandshakeCertificate));
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_SERVER_KEY_EXCH);
+}
+
+TEST_P(TlsSkipTest, SkipServerKeyExchange) {
+  ServerSkipTest(new TlsHandshakeSkipFilter(kTlsHandshakeServerKeyExchange));
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
+}
+
+TEST_P(TlsSkipTest, SkipServerKeyExchangeEcdsa) {
+  Reset(TlsAgent::kServerEcdsa256);
+  ServerSkipTest(new TlsHandshakeSkipFilter(kTlsHandshakeServerKeyExchange));
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
+}
+
+TEST_P(TlsSkipTest, SkipCertAndKeyExch) {
+  auto chain = new ChainedPacketFilter();
+  chain->Add(new TlsHandshakeSkipFilter(kTlsHandshakeCertificate));
+  chain->Add(new TlsHandshakeSkipFilter(kTlsHandshakeServerKeyExchange));
+  ServerSkipTest(chain);
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
+}
+
+TEST_P(TlsSkipTest, SkipCertAndKeyExchEcdsa) {
+  Reset(TlsAgent::kServerEcdsa256);
+  auto chain = new ChainedPacketFilter();
+  chain->Add(new TlsHandshakeSkipFilter(kTlsHandshakeCertificate));
+  chain->Add(new TlsHandshakeSkipFilter(kTlsHandshakeServerKeyExchange));
+  ServerSkipTest(chain);
+  client_->CheckErrorCode(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
+}
+
+INSTANTIATE_TEST_CASE_P(SkipTls10, TlsSkipTest,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesStream,
+                                           TlsConnectTestBase::kTlsV10));
+INSTANTIATE_TEST_CASE_P(SkipVariants, TlsSkipTest,
+                        ::testing::Combine(TlsConnectTestBase::kTlsModesAll,
+                                           TlsConnectTestBase::kTlsV11V12));
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_staticrsa_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_staticrsa_unittest.cc
new file mode 100644
index 0000000000..baf24ed9c8
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_staticrsa_unittest.cc
@@ -0,0 +1,123 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <functional>
+#include <memory>
+#include "secerr.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+const uint8_t kBogusClientKeyExchange[] = {
+    0x01, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+};
+
+TEST_P(TlsConnectGenericPre13, ConnectStaticRSA) {
+  EnableOnlyStaticRsaCiphers();
+  Connect();
+  CheckKeys(ssl_kea_rsa, ssl_grp_none, ssl_auth_rsa_decrypt, ssl_sig_none);
+}
+
+// Test that a totally bogus EPMS is handled correctly.
+// This test is stream so we can catch the bad_record_mac alert.
+TEST_P(TlsConnectStreamPre13, ConnectStaticRSABogusCKE) {
+  EnableOnlyStaticRsaCiphers();
+  TlsInspectorReplaceHandshakeMessage* i1 =
+      new TlsInspectorReplaceHandshakeMessage(
+          kTlsHandshakeClientKeyExchange,
+          DataBuffer(kBogusClientKeyExchange, sizeof(kBogusClientKeyExchange)));
+  client_->SetPacketFilter(i1);
+  auto alert_recorder = new TlsAlertRecorder();
+  server_->SetPacketFilter(alert_recorder);
+  ConnectExpectFail();
+  EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+  EXPECT_EQ(kTlsAlertBadRecordMac, alert_recorder->description());
+}
+
+// Test that a PMS with a bogus version number is handled correctly.
+// This test is stream so we can catch the bad_record_mac alert.
+TEST_P(TlsConnectStreamPre13, ConnectStaticRSABogusPMSVersionDetect) {
+  EnableOnlyStaticRsaCiphers();
+  client_->SetPacketFilter(new TlsInspectorClientHelloVersionChanger(server_));
+  auto alert_recorder = new TlsAlertRecorder();
+  server_->SetPacketFilter(alert_recorder);
+  ConnectExpectFail();
+  EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+  EXPECT_EQ(kTlsAlertBadRecordMac, alert_recorder->description());
+}
+
+// Test that a PMS with a bogus version number is ignored when
+// rollback detection is disabled. This is a positive control for
+// ConnectStaticRSABogusPMSVersionDetect.
+TEST_P(TlsConnectGenericPre13, ConnectStaticRSABogusPMSVersionIgnore) {
+  EnableOnlyStaticRsaCiphers();
+  client_->SetPacketFilter(new TlsInspectorClientHelloVersionChanger(server_));
+  server_->DisableRollbackDetection();
+  Connect();
+}
+
+// This test is stream so we can catch the bad_record_mac alert.
+TEST_P(TlsConnectStreamPre13, ConnectExtendedMasterSecretStaticRSABogusCKE) {
+  EnableOnlyStaticRsaCiphers();
+  EnableExtendedMasterSecret();
+  TlsInspectorReplaceHandshakeMessage* inspect =
+      new TlsInspectorReplaceHandshakeMessage(
+          kTlsHandshakeClientKeyExchange,
+          DataBuffer(kBogusClientKeyExchange, sizeof(kBogusClientKeyExchange)));
+  client_->SetPacketFilter(inspect);
+  auto alert_recorder = new TlsAlertRecorder();
+  server_->SetPacketFilter(alert_recorder);
+  ConnectExpectFail();
+  EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+  EXPECT_EQ(kTlsAlertBadRecordMac, alert_recorder->description());
+}
+
+// This test is stream so we can catch the bad_record_mac alert.
+TEST_P(TlsConnectStreamPre13,
+       ConnectExtendedMasterSecretStaticRSABogusPMSVersionDetect) {
+  EnableOnlyStaticRsaCiphers();
+  EnableExtendedMasterSecret();
+  client_->SetPacketFilter(new TlsInspectorClientHelloVersionChanger(server_));
+  auto alert_recorder = new TlsAlertRecorder();
+  server_->SetPacketFilter(alert_recorder);
+  ConnectExpectFail();
+  EXPECT_EQ(kTlsAlertFatal, alert_recorder->level());
+  EXPECT_EQ(kTlsAlertBadRecordMac, alert_recorder->description());
+}
+
+TEST_P(TlsConnectStreamPre13,
+       ConnectExtendedMasterSecretStaticRSABogusPMSVersionIgnore) {
+  EnableOnlyStaticRsaCiphers();
+  EnableExtendedMasterSecret();
+  client_->SetPacketFilter(new TlsInspectorClientHelloVersionChanger(server_));
+  server_->DisableRollbackDetection();
+  Connect();
+}
+
+}  // namespace nspr_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_v2_client_hello_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_v2_client_hello_unittest.cc
new file mode 100644
index 0000000000..8b586beae7
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_v2_client_hello_unittest.cc
@@ -0,0 +1,351 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "pk11pub.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include "gtest_utils.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+
+namespace nss_test {
+
+// Replaces the client hello with an SSLv2 version once.
+class SSLv2ClientHelloFilter : public PacketFilter {
+ public:
+  SSLv2ClientHelloFilter(TlsAgent* client, uint16_t version)
+      : replaced_(false),
+        client_(client),
+        version_(version),
+        pad_len_(0),
+        reported_pad_len_(0),
+        client_random_len_(16),
+        ciphers_(0),
+        send_escape_(false) {}
+
+  void SetVersion(uint16_t version) { version_ = version; }
+
+  void SetCipherSuites(const std::vector<uint16_t>& ciphers) {
+    ciphers_ = ciphers;
+  }
+
+  // Set a padding length and announce it correctly.
+  void SetPadding(uint8_t pad_len) { SetPadding(pad_len, pad_len); }
+
+  // Set a padding length and allow to lie about its length.
+  void SetPadding(uint8_t pad_len, uint8_t reported_pad_len) {
+    pad_len_ = pad_len;
+    reported_pad_len_ = reported_pad_len;
+  }
+
+  void SetClientRandomLength(uint16_t client_random_len) {
+    client_random_len_ = client_random_len;
+  }
+
+  void SetSendEscape(bool send_escape) { send_escape_ = send_escape; }
+
+ protected:
+  virtual PacketFilter::Action Filter(const DataBuffer& input,
+                                      DataBuffer* output) {
+    if (replaced_) {
+      return KEEP;
+    }
+
+    // Replace only the very first packet.
+    replaced_ = true;
+
+    // The SSLv2 client hello size.
+    size_t packet_len = SSL_HL_CLIENT_HELLO_HBYTES + (ciphers_.size() * 3) +
+                        client_random_len_ + pad_len_;
+
+    size_t idx = 0;
+    *output = input;
+    output->Allocate(packet_len);
+    output->Truncate(packet_len);
+
+    // Write record length.
+    if (pad_len_ > 0) {
+      size_t masked_len = 0x3fff & packet_len;
+      if (send_escape_) {
+        masked_len |= 0x4000;
+      }
+
+      idx = output->Write(idx, masked_len, 2);
+      idx = output->Write(idx, reported_pad_len_, 1);
+    } else {
+      PR_ASSERT(!send_escape_);
+      idx = output->Write(idx, 0x8000 | packet_len, 2);
+    }
+
+    // Remember header length.
+    size_t hdr_len = idx;
+
+    // Write client hello.
+    idx = output->Write(idx, SSL_MT_CLIENT_HELLO, 1);
+    idx = output->Write(idx, version_, 2);
+
+    // Cipher list length.
+    idx = output->Write(idx, (ciphers_.size() * 3), 2);
+
+    // Session ID length.
+    idx = output->Write(idx, static_cast<uint32_t>(0), 2);
+
+    // ClientRandom length.
+    idx = output->Write(idx, client_random_len_, 2);
+
+    // Cipher suites.
+    for (auto cipher : ciphers_) {
+      idx = output->Write(idx, static_cast<uint32_t>(cipher), 3);
+    }
+
+    // Challenge.
+    std::vector<uint8_t> challenge(client_random_len_);
+    PK11_GenerateRandom(challenge.data(), challenge.size());
+    idx = output->Write(idx, challenge.data(), challenge.size());
+
+    // Add padding if any.
+    if (pad_len_ > 0) {
+      std::vector<uint8_t> pad(pad_len_);
+      idx = output->Write(idx, pad.data(), pad.size());
+    }
+
+    // Update the client random so that the handshake succeeds.
+    SECStatus rv = SSLInt_UpdateSSLv2ClientRandom(
+        client_->ssl_fd(), challenge.data(), challenge.size(),
+        output->data() + hdr_len, output->len() - hdr_len);
+    EXPECT_EQ(SECSuccess, rv);
+
+    return CHANGE;
+  }
+
+ private:
+  bool replaced_;
+  TlsAgent* client_;
+  uint16_t version_;
+  uint8_t pad_len_;
+  uint8_t reported_pad_len_;
+  uint16_t client_random_len_;
+  std::vector<uint16_t> ciphers_;
+  bool send_escape_;
+};
+
+class SSLv2ClientHelloTestF : public TlsConnectTestBase {
+ public:
+  SSLv2ClientHelloTestF() : TlsConnectTestBase(STREAM, 0), filter_(nullptr) {}
+
+  SSLv2ClientHelloTestF(Mode mode, uint16_t version)
+      : TlsConnectTestBase(mode, version), filter_(nullptr) {}
+
+  void SetUp() {
+    TlsConnectTestBase::SetUp();
+    filter_ = new SSLv2ClientHelloFilter(client_, version_);
+    client_->SetPacketFilter(filter_);
+  }
+
+  void RequireSafeRenegotiation() {
+    server_->EnsureTlsSetup();
+    SECStatus rv =
+        SSL_OptionSet(server_->ssl_fd(), SSL_REQUIRE_SAFE_NEGOTIATION, PR_TRUE);
+    EXPECT_EQ(rv, SECSuccess);
+  }
+
+  void SetExpectedVersion(uint16_t version) {
+    TlsConnectTestBase::SetExpectedVersion(version);
+    filter_->SetVersion(version);
+  }
+
+  void SetAvailableCipherSuite(uint16_t cipher) {
+    filter_->SetCipherSuites(std::vector<uint16_t>(1, cipher));
+  }
+
+  void SetAvailableCipherSuites(const std::vector<uint16_t>& ciphers) {
+    filter_->SetCipherSuites(ciphers);
+  }
+
+  void SetPadding(uint8_t pad_len) { filter_->SetPadding(pad_len); }
+
+  void SetPadding(uint8_t pad_len, uint8_t reported_pad_len) {
+    filter_->SetPadding(pad_len, reported_pad_len);
+  }
+
+  void SetClientRandomLength(uint16_t client_random_len) {
+    filter_->SetClientRandomLength(client_random_len);
+  }
+
+  void SetSendEscape(bool send_escape) { filter_->SetSendEscape(send_escape); }
+
+ private:
+  SSLv2ClientHelloFilter* filter_;
+};
+
+// Parameterized version of SSLv2ClientHelloTestF we can
+// use with TEST_P to test multiple TLS versions easily.
+class SSLv2ClientHelloTest : public SSLv2ClientHelloTestF,
+                             public ::testing::WithParamInterface<uint16_t> {
+ public:
+  SSLv2ClientHelloTest() : SSLv2ClientHelloTestF(STREAM, GetParam()) {}
+};
+
+// Test negotiating TLS 1.0 - 1.2.
+TEST_P(SSLv2ClientHelloTest, Connect) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+  Connect();
+}
+
+// Test negotiating TLS 1.3.
+TEST_F(SSLv2ClientHelloTestF, Connect13) {
+  EnsureTlsSetup();
+  SetExpectedVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+
+  std::vector<uint16_t> cipher_suites = {TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256};
+  SetAvailableCipherSuites(cipher_suites);
+
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, server_->error_code());
+}
+
+// Test negotiating an EC suite.
+TEST_P(SSLv2ClientHelloTest, NegotiateECSuite) {
+  SetAvailableCipherSuite(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA);
+  Connect();
+}
+
+// Test negotiating TLS 1.0 - 1.2 with a padded client hello.
+TEST_P(SSLv2ClientHelloTest, AddPadding) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+  SetPadding(255);
+  Connect();
+}
+
+// Test that sending a security escape fails the handshake.
+TEST_P(SSLv2ClientHelloTest, SendSecurityEscape) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+
+  // Send a security escape.
+  SetSendEscape(true);
+
+  // Set a big padding so that the server fails instead of timing out.
+  SetPadding(255);
+
+  ConnectExpectFail();
+}
+
+// Invalid SSLv2 client hello padding must fail the handshake.
+TEST_P(SSLv2ClientHelloTest, AddErroneousPadding) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+
+  // Append 5 bytes of padding but say it's only 4.
+  SetPadding(5, 4);
+
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, server_->error_code());
+}
+
+// Invalid SSLv2 client hello padding must fail the handshake.
+TEST_P(SSLv2ClientHelloTest, AddErroneousPadding2) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+
+  // Append 5 bytes of padding but say it's 6.
+  SetPadding(5, 6);
+
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, server_->error_code());
+}
+
+// Wrong amount of bytes for the ClientRandom must fail the handshake.
+TEST_P(SSLv2ClientHelloTest, SmallClientRandom) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+
+  // Send a ClientRandom that's too small.
+  SetClientRandomLength(15);
+
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, server_->error_code());
+}
+
+// Test sending the maximum accepted number of ClientRandom bytes.
+TEST_P(SSLv2ClientHelloTest, MaxClientRandom) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+  SetClientRandomLength(32);
+  Connect();
+}
+
+// Wrong amount of bytes for the ClientRandom must fail the handshake.
+TEST_P(SSLv2ClientHelloTest, BigClientRandom) {
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+
+  // Send a ClientRandom that's too big.
+  SetClientRandomLength(33);
+
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, server_->error_code());
+}
+
+// Connection must fail if we require safe renegotiation but the client doesn't
+// include TLS_EMPTY_RENEGOTIATION_INFO_SCSV in the list of cipher suites.
+TEST_P(SSLv2ClientHelloTest, RequireSafeRenegotiation) {
+  RequireSafeRenegotiation();
+  SetAvailableCipherSuite(TLS_DHE_RSA_WITH_AES_128_CBC_SHA);
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_UNSAFE_NEGOTIATION, server_->error_code());
+}
+
+// Connection must succeed when requiring safe renegotiation and the client
+// includes TLS_EMPTY_RENEGOTIATION_INFO_SCSV in the list of cipher suites.
+TEST_P(SSLv2ClientHelloTest, RequireSafeRenegotiationWithSCSV) {
+  RequireSafeRenegotiation();
+  std::vector<uint16_t> cipher_suites = {TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
+                                         TLS_EMPTY_RENEGOTIATION_INFO_SCSV};
+  SetAvailableCipherSuites(cipher_suites);
+  Connect();
+}
+
+// Connect to the server with TLS 1.1, signalling that this is a fallback from
+// a higher version. As the server doesn't support anything higher than TLS 1.1
+// it must accept the connection.
+TEST_F(SSLv2ClientHelloTestF, FallbackSCSV) {
+  EnsureTlsSetup();
+  SetExpectedVersion(SSL_LIBRARY_VERSION_TLS_1_1);
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_1);
+
+  std::vector<uint16_t> cipher_suites = {TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
+                                         TLS_FALLBACK_SCSV};
+  SetAvailableCipherSuites(cipher_suites);
+  Connect();
+}
+
+// Connect to the server with TLS 1.1, signalling that this is a fallback from
+// a higher version. As the server supports TLS 1.2 though it must reject the
+// connection due to a possible downgrade attack.
+TEST_F(SSLv2ClientHelloTestF, InappropriateFallbackSCSV) {
+  SetExpectedVersion(SSL_LIBRARY_VERSION_TLS_1_1);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_1);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+
+  std::vector<uint16_t> cipher_suites = {TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
+                                         TLS_FALLBACK_SCSV};
+  SetAvailableCipherSuites(cipher_suites);
+
+  ConnectExpectFail();
+  EXPECT_EQ(SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT, server_->error_code());
+}
+
+INSTANTIATE_TEST_CASE_P(VersionsStream10Pre13, SSLv2ClientHelloTest,
+                        TlsConnectTestBase::kTlsV10);
+INSTANTIATE_TEST_CASE_P(VersionsStreamPre13, SSLv2ClientHelloTest,
+                        TlsConnectTestBase::kTlsV11V12);
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/ssl_version_unittest.cc b/security/nss/gtests/ssl_gtest/ssl_version_unittest.cc
new file mode 100644
index 0000000000..b3538497e9
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/ssl_version_unittest.cc
@@ -0,0 +1,300 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "secerr.h"
+#include "ssl.h"
+#include "ssl3prot.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+#include "tls_connect.h"
+#include "tls_filter.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+TEST_P(TlsConnectStream, ServerNegotiateTls10) {
+  uint16_t minver, maxver;
+  client_->GetVersionRange(&minver, &maxver);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0, maxver);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
+                           SSL_LIBRARY_VERSION_TLS_1_0);
+  Connect();
+}
+
+TEST_P(TlsConnectGeneric, ServerNegotiateTls11) {
+  if (version_ < SSL_LIBRARY_VERSION_TLS_1_1) return;
+
+  uint16_t minver, maxver;
+  client_->GetVersionRange(&minver, &maxver);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1, maxver);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_1);
+  Connect();
+}
+
+TEST_P(TlsConnectGeneric, ServerNegotiateTls12) {
+  if (version_ < SSL_LIBRARY_VERSION_TLS_1_2) return;
+
+  uint16_t minver, maxver;
+  client_->GetVersionRange(&minver, &maxver);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2, maxver);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  Connect();
+}
+#ifndef TLS_1_3_DRAFT_VERSION
+
+// Test the ServerRandom version hack from
+// [draft-ietf-tls-tls13-11 Section 6.3.1.1].
+// The first three tests test for active tampering. The next
+// two validate that we can also detect fallback using the
+// SSL_SetDowngradeCheckVersion() API.
+TEST_F(TlsConnectTest, TestDowngradeDetectionToTls11) {
+  client_->SetPacketFilter(
+      new TlsInspectorClientHelloVersionSetter(SSL_LIBRARY_VERSION_TLS_1_1));
+  ConnectExpectFail();
+  ASSERT_EQ(SSL_ERROR_RX_MALFORMED_SERVER_HELLO, client_->error_code());
+}
+
+/* Attempt to negotiate the bogus DTLS 1.1 version. */
+TEST_F(DtlsConnectTest, TestDtlsVersion11) {
+  client_->SetPacketFilter(
+      new TlsInspectorClientHelloVersionSetter(((~0x0101) & 0xffff)));
+  ConnectExpectFail();
+  // It's kind of surprising that SSL_ERROR_NO_CYPHER_OVERLAP is
+  // what is returned here, but this is deliberate in ssl3_HandleAlert().
+  EXPECT_EQ(SSL_ERROR_NO_CYPHER_OVERLAP, client_->error_code());
+  EXPECT_EQ(SSL_ERROR_UNSUPPORTED_VERSION, server_->error_code());
+}
+
+// Disabled as long as we have draft version.
+TEST_F(TlsConnectTest, TestDowngradeDetectionToTls12) {
+  EnsureTlsSetup();
+  client_->SetPacketFilter(
+      new TlsInspectorClientHelloVersionSetter(SSL_LIBRARY_VERSION_TLS_1_2));
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  ConnectExpectFail();
+  ASSERT_EQ(SSL_ERROR_RX_MALFORMED_SERVER_HELLO, client_->error_code());
+}
+
+// TLS 1.1 clients do not check the random values, so we should
+// instead get a handshake failure alert from the server.
+TEST_F(TlsConnectTest, TestDowngradeDetectionToTls10) {
+  client_->SetPacketFilter(
+      new TlsInspectorClientHelloVersionSetter(SSL_LIBRARY_VERSION_TLS_1_0));
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
+                           SSL_LIBRARY_VERSION_TLS_1_1);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  ConnectExpectFail();
+  ASSERT_EQ(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE, server_->error_code());
+  ASSERT_EQ(SSL_ERROR_DECRYPT_ERROR_ALERT, client_->error_code());
+}
+
+TEST_F(TlsConnectTest, TestFallbackFromTls12) {
+  EnsureTlsSetup();
+  client_->SetDowngradeCheckVersion(SSL_LIBRARY_VERSION_TLS_1_2);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_1);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  ConnectExpectFail();
+  ASSERT_EQ(SSL_ERROR_RX_MALFORMED_SERVER_HELLO, client_->error_code());
+}
+
+TEST_F(TlsConnectTest, TestFallbackFromTls13) {
+  EnsureTlsSetup();
+  client_->SetDowngradeCheckVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                           SSL_LIBRARY_VERSION_TLS_1_2);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  ConnectExpectFail();
+  ASSERT_EQ(SSL_ERROR_RX_MALFORMED_SERVER_HELLO, client_->error_code());
+}
+#endif
+
+// The TLS v1.3 spec section C.4 states that 'Implementations MUST NOT send or
+// accept any records with a version less than { 3, 0 }'. Thus we will not
+// allow version ranges including both SSL v3 and TLS v1.3.
+TEST_F(TlsConnectTest, DisallowSSLv3HelloWithTLSv13Enabled) {
+  SECStatus rv;
+  SSLVersionRange vrange = {SSL_LIBRARY_VERSION_3_0,
+                            SSL_LIBRARY_VERSION_TLS_1_3};
+
+  EnsureTlsSetup();
+  rv = SSL_VersionRangeSet(client_->ssl_fd(), &vrange);
+  EXPECT_EQ(SECFailure, rv);
+
+  rv = SSL_VersionRangeSet(server_->ssl_fd(), &vrange);
+  EXPECT_EQ(SECFailure, rv);
+}
+
+TEST_P(TlsConnectStream, ConnectTls10AndServerRenegotiateHigher) {
+  if (version_ == SSL_LIBRARY_VERSION_TLS_1_0) {
+    return;
+  }
+  // Set the client so it will accept any version from 1.0
+  // to |version_|.
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0, version_);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
+                           SSL_LIBRARY_VERSION_TLS_1_0);
+  // Reset version so that the checks succeed.
+  uint16_t test_version = version_;
+  version_ = SSL_LIBRARY_VERSION_TLS_1_0;
+  Connect();
+
+  // Now renegotiate, with the server being set to do
+  // |version_|.
+  client_->PrepareForRenegotiate();
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0, test_version);
+  // Reset version and cipher suite so that the preinfo callback
+  // doesn't fail.
+  server_->ResetPreliminaryInfo();
+  server_->StartRenegotiate();
+  Handshake();
+  if (test_version >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    // In TLS 1.3, the server detects this problem.
+    client_->CheckErrorCode(SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT);
+    server_->CheckErrorCode(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED);
+  } else {
+    client_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_VERSION);
+    server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  }
+}
+
+TEST_P(TlsConnectStream, ConnectTls10AndClientRenegotiateHigher) {
+  if (version_ == SSL_LIBRARY_VERSION_TLS_1_0) {
+    return;
+  }
+  // Set the client so it will accept any version from 1.0
+  // to |version_|.
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0, version_);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0,
+                           SSL_LIBRARY_VERSION_TLS_1_0);
+  // Reset version so that the checks succeed.
+  uint16_t test_version = version_;
+  version_ = SSL_LIBRARY_VERSION_TLS_1_0;
+  Connect();
+
+  // Now renegotiate, with the server being set to do
+  // |version_|.
+  server_->PrepareForRenegotiate();
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_0, test_version);
+  // Reset version and cipher suite so that the preinfo callback
+  // doesn't fail.
+  server_->ResetPreliminaryInfo();
+  client_->StartRenegotiate();
+  Handshake();
+  if (test_version >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    // In TLS 1.3, the server detects this problem.
+    client_->CheckErrorCode(SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT);
+    server_->CheckErrorCode(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED);
+  } else {
+    client_->CheckErrorCode(SSL_ERROR_UNSUPPORTED_VERSION);
+    server_->CheckErrorCode(SSL_ERROR_ILLEGAL_PARAMETER_ALERT);
+  }
+}
+
+TEST_F(TlsConnectTest, Tls13RejectsRehandshakeClient) {
+  EnsureTlsSetup();
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  Connect();
+  SECStatus rv = SSL_ReHandshake(client_->ssl_fd(), PR_TRUE);
+  EXPECT_EQ(SECFailure, rv);
+  EXPECT_EQ(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED, PORT_GetError());
+}
+
+TEST_F(TlsConnectTest, Tls13RejectsRehandshakeServer) {
+  EnsureTlsSetup();
+  ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
+  Connect();
+  SECStatus rv = SSL_ReHandshake(server_->ssl_fd(), PR_TRUE);
+  EXPECT_EQ(SECFailure, rv);
+  EXPECT_EQ(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED, PORT_GetError());
+}
+
+TEST_P(TlsConnectGeneric, AlertBeforeServerHello) {
+  EnsureTlsSetup();
+  client_->StartConnect();
+  server_->StartConnect();
+  client_->Handshake();  // Send ClientHello.
+  static const uint8_t kWarningAlert[] = {kTlsAlertWarning,
+                                          kTlsAlertUnrecognizedName};
+  DataBuffer alert;
+  TlsAgentTestBase::MakeRecord(mode_, kTlsAlertType,
+                               SSL_LIBRARY_VERSION_TLS_1_0, kWarningAlert,
+                               PR_ARRAY_SIZE(kWarningAlert), &alert);
+  client_->adapter()->PacketReceived(alert);
+  Handshake();
+  CheckConnected();
+}
+
+class Tls13NoSupportedVersions : public TlsConnectStreamTls12 {
+ protected:
+  void Run(uint16_t overwritten_client_version, uint16_t max_server_version) {
+    client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2,
+                             SSL_LIBRARY_VERSION_TLS_1_2);
+    server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_2, max_server_version);
+    client_->SetPacketFilter(
+        new TlsInspectorClientHelloVersionSetter(overwritten_client_version));
+    auto capture =
+        new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerHello);
+    server_->SetPacketFilter(capture);
+    ConnectExpectFail();
+    client_->CheckErrorCode(SSL_ERROR_DECRYPT_ERROR_ALERT);
+    server_->CheckErrorCode(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
+    const DataBuffer& server_hello = capture->buffer();
+    ASSERT_GT(server_hello.len(), 2U);
+    uint32_t ver;
+    ASSERT_TRUE(server_hello.Read(0, 2, &ver));
+    ASSERT_EQ(static_cast<uint32_t>(SSL_LIBRARY_VERSION_TLS_1_2), ver);
+  }
+};
+
+// If we offer a 1.3 ClientHello w/o supported_versions, the server should
+// negotiate 1.2.
+TEST_F(Tls13NoSupportedVersions,
+       Tls13ClientHelloWithoutSupportedVersionsServer12) {
+  Run(SSL_LIBRARY_VERSION_TLS_1_3, SSL_LIBRARY_VERSION_TLS_1_2);
+}
+
+TEST_F(Tls13NoSupportedVersions,
+       Tls13ClientHelloWithoutSupportedVersionsServer13) {
+  Run(SSL_LIBRARY_VERSION_TLS_1_3, SSL_LIBRARY_VERSION_TLS_1_3);
+}
+
+TEST_F(Tls13NoSupportedVersions,
+       Tls14ClientHelloWithoutSupportedVersionsServer13) {
+  Run(SSL_LIBRARY_VERSION_TLS_1_3 + 1, SSL_LIBRARY_VERSION_TLS_1_3);
+}
+
+// Offer 1.3 but with ClientHello.legacy_version == TLS 1.4. This
+// causes a bad MAC error when we read EncryptedExtensions.
+TEST_F(TlsConnectStreamTls13, Tls14ClientHelloWithSupportedVersions) {
+  client_->SetPacketFilter(new TlsInspectorClientHelloVersionSetter(
+      SSL_LIBRARY_VERSION_TLS_1_3 + 1));
+  auto capture =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeServerHello);
+  server_->SetPacketFilter(capture);
+  ConnectExpectFail();
+  client_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
+  server_->CheckErrorCode(SSL_ERROR_BAD_MAC_READ);
+  const DataBuffer& server_hello = capture->buffer();
+  ASSERT_GT(server_hello.len(), 2U);
+  uint32_t ver;
+  ASSERT_TRUE(server_hello.Read(0, 2, &ver));
+  // This way we don't need to change with new draft version.
+  ASSERT_LT(static_cast<uint32_t>(SSL_LIBRARY_VERSION_TLS_1_2), ver);
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/test_io.cc b/security/nss/gtests/ssl_gtest/test_io.cc
new file mode 100644
index 0000000000..f3fd0b24c5
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/test_io.cc
@@ -0,0 +1,536 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "test_io.h"
+
+#include <algorithm>
+#include <cassert>
+#include <iostream>
+#include <memory>
+
+#include "prerror.h"
+#include "prlog.h"
+#include "prthread.h"
+
+#include "databuffer.h"
+
+extern bool g_ssl_gtest_verbose;
+
+namespace nss_test {
+
+static PRDescIdentity test_fd_identity = PR_INVALID_IO_LAYER;
+
+#define UNIMPLEMENTED()                                                        \
+  std::cerr << "Call to unimplemented function " << __FUNCTION__ << std::endl; \
+  PR_ASSERT(PR_FALSE);                                                         \
+  PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0)
+
+#define LOG(a) std::cerr << name_ << ": " << a << std::endl
+#define LOGV(a)                      \
+  do {                               \
+    if (g_ssl_gtest_verbose) LOG(a); \
+  } while (false)
+
+class Packet : public DataBuffer {
+ public:
+  Packet(const DataBuffer &buf) : DataBuffer(buf), offset_(0) {}
+
+  void Advance(size_t delta) {
+    PR_ASSERT(offset_ + delta <= len());
+    offset_ = std::min(len(), offset_ + delta);
+  }
+
+  size_t offset() const { return offset_; }
+  size_t remaining() const { return len() - offset_; }
+
+ private:
+  size_t offset_;
+};
+
+// Implementation of NSPR methods
+static PRStatus DummyClose(PRFileDesc *f) {
+  DummyPrSocket *io = reinterpret_cast<DummyPrSocket *>(f->secret);
+  f->secret = nullptr;
+  f->dtor(f);
+  delete io;
+  return PR_SUCCESS;
+}
+
+static int32_t DummyRead(PRFileDesc *f, void *buf, int32_t length) {
+  DummyPrSocket *io = reinterpret_cast<DummyPrSocket *>(f->secret);
+  return io->Read(buf, length);
+}
+
+static int32_t DummyWrite(PRFileDesc *f, const void *buf, int32_t length) {
+  DummyPrSocket *io = reinterpret_cast<DummyPrSocket *>(f->secret);
+  return io->Write(buf, length);
+}
+
+static int32_t DummyAvailable(PRFileDesc *f) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+int64_t DummyAvailable64(PRFileDesc *f) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static PRStatus DummySync(PRFileDesc *f) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static int32_t DummySeek(PRFileDesc *f, int32_t offset, PRSeekWhence how) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static int64_t DummySeek64(PRFileDesc *f, int64_t offset, PRSeekWhence how) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static PRStatus DummyFileInfo(PRFileDesc *f, PRFileInfo *info) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static PRStatus DummyFileInfo64(PRFileDesc *f, PRFileInfo64 *info) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static int32_t DummyWritev(PRFileDesc *f, const PRIOVec *iov, int32_t iov_size,
+                           PRIntervalTime to) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static PRStatus DummyConnect(PRFileDesc *f, const PRNetAddr *addr,
+                             PRIntervalTime to) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static PRFileDesc *DummyAccept(PRFileDesc *sd, PRNetAddr *addr,
+                               PRIntervalTime to) {
+  UNIMPLEMENTED();
+  return nullptr;
+}
+
+static PRStatus DummyBind(PRFileDesc *f, const PRNetAddr *addr) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static PRStatus DummyListen(PRFileDesc *f, int32_t depth) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static PRStatus DummyShutdown(PRFileDesc *f, int32_t how) {
+  DummyPrSocket *io = reinterpret_cast<DummyPrSocket *>(f->secret);
+  io->Reset();
+  return PR_SUCCESS;
+}
+
+// This function does not support peek.
+static int32_t DummyRecv(PRFileDesc *f, void *buf, int32_t buflen,
+                         int32_t flags, PRIntervalTime to) {
+  PR_ASSERT(flags == 0);
+  if (flags != 0) {
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return -1;
+  }
+
+  DummyPrSocket *io = reinterpret_cast<DummyPrSocket *>(f->secret);
+
+  if (io->mode() == DGRAM) {
+    return io->Recv(buf, buflen);
+  } else {
+    return io->Read(buf, buflen);
+  }
+}
+
+// Note: this is always nonblocking and assumes a zero timeout.
+static int32_t DummySend(PRFileDesc *f, const void *buf, int32_t amount,
+                         int32_t flags, PRIntervalTime to) {
+  int32_t written = DummyWrite(f, buf, amount);
+  return written;
+}
+
+static int32_t DummyRecvfrom(PRFileDesc *f, void *buf, int32_t amount,
+                             int32_t flags, PRNetAddr *addr,
+                             PRIntervalTime to) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static int32_t DummySendto(PRFileDesc *f, const void *buf, int32_t amount,
+                           int32_t flags, const PRNetAddr *addr,
+                           PRIntervalTime to) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static int16_t DummyPoll(PRFileDesc *f, int16_t in_flags, int16_t *out_flags) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static int32_t DummyAcceptRead(PRFileDesc *sd, PRFileDesc **nd,
+                               PRNetAddr **raddr, void *buf, int32_t amount,
+                               PRIntervalTime t) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static int32_t DummyTransmitFile(PRFileDesc *sd, PRFileDesc *f,
+                                 const void *headers, int32_t hlen,
+                                 PRTransmitFileFlags flags, PRIntervalTime t) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static PRStatus DummyGetpeername(PRFileDesc *f, PRNetAddr *addr) {
+  // TODO: Modify to return unique names for each channel
+  // somehow, as opposed to always the same static address. The current
+  // implementation messes up the session cache, which is why it's off
+  // elsewhere
+  addr->inet.family = PR_AF_INET;
+  addr->inet.port = 0;
+  addr->inet.ip = 0;
+
+  return PR_SUCCESS;
+}
+
+static PRStatus DummyGetsockname(PRFileDesc *f, PRNetAddr *addr) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static PRStatus DummyGetsockoption(PRFileDesc *f, PRSocketOptionData *opt) {
+  switch (opt->option) {
+    case PR_SockOpt_Nonblocking:
+      opt->value.non_blocking = PR_TRUE;
+      return PR_SUCCESS;
+    default:
+      UNIMPLEMENTED();
+      break;
+  }
+
+  return PR_FAILURE;
+}
+
+// Imitate setting socket options. These are mostly noops.
+static PRStatus DummySetsockoption(PRFileDesc *f,
+                                   const PRSocketOptionData *opt) {
+  switch (opt->option) {
+    case PR_SockOpt_Nonblocking:
+      return PR_SUCCESS;
+    case PR_SockOpt_NoDelay:
+      return PR_SUCCESS;
+    default:
+      UNIMPLEMENTED();
+      break;
+  }
+
+  return PR_FAILURE;
+}
+
+static int32_t DummySendfile(PRFileDesc *out, PRSendFileData *in,
+                             PRTransmitFileFlags flags, PRIntervalTime to) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+static PRStatus DummyConnectContinue(PRFileDesc *f, int16_t flags) {
+  UNIMPLEMENTED();
+  return PR_FAILURE;
+}
+
+static int32_t DummyReserved(PRFileDesc *f) {
+  UNIMPLEMENTED();
+  return -1;
+}
+
+DummyPrSocket::~DummyPrSocket() { Reset(); }
+
+void DummyPrSocket::SetPacketFilter(PacketFilter *filter) {
+  if (filter_) {
+    delete filter_;
+  }
+  filter_ = filter;
+}
+
+void DummyPrSocket::Reset() {
+  delete filter_;
+  if (peer_) {
+    peer_->SetPeer(nullptr);
+    peer_ = nullptr;
+  }
+  while (!input_.empty()) {
+    Packet *front = input_.front();
+    input_.pop();
+    delete front;
+  }
+}
+
+static const struct PRIOMethods DummyMethods = {
+    PR_DESC_LAYERED,    DummyClose,
+    DummyRead,          DummyWrite,
+    DummyAvailable,     DummyAvailable64,
+    DummySync,          DummySeek,
+    DummySeek64,        DummyFileInfo,
+    DummyFileInfo64,    DummyWritev,
+    DummyConnect,       DummyAccept,
+    DummyBind,          DummyListen,
+    DummyShutdown,      DummyRecv,
+    DummySend,          DummyRecvfrom,
+    DummySendto,        DummyPoll,
+    DummyAcceptRead,    DummyTransmitFile,
+    DummyGetsockname,   DummyGetpeername,
+    DummyReserved,      DummyReserved,
+    DummyGetsockoption, DummySetsockoption,
+    DummySendfile,      DummyConnectContinue,
+    DummyReserved,      DummyReserved,
+    DummyReserved,      DummyReserved};
+
+PRFileDesc *DummyPrSocket::CreateFD(const std::string &name, Mode mode) {
+  if (test_fd_identity == PR_INVALID_IO_LAYER) {
+    test_fd_identity = PR_GetUniqueIdentity("testtransportadapter");
+  }
+
+  PRFileDesc *fd = (PR_CreateIOLayerStub(test_fd_identity, &DummyMethods));
+  fd->secret = reinterpret_cast<PRFilePrivate *>(new DummyPrSocket(name, mode));
+
+  return fd;
+}
+
+DummyPrSocket *DummyPrSocket::GetAdapter(PRFileDesc *fd) {
+  return reinterpret_cast<DummyPrSocket *>(fd->secret);
+}
+
+void DummyPrSocket::PacketReceived(const DataBuffer &packet) {
+  input_.push(new Packet(packet));
+}
+
+int32_t DummyPrSocket::Read(void *data, int32_t len) {
+  PR_ASSERT(mode_ == STREAM);
+
+  if (mode_ != STREAM) {
+    PR_SetError(PR_INVALID_METHOD_ERROR, 0);
+    return -1;
+  }
+
+  if (input_.empty()) {
+    LOGV("Read --> wouldblock " << len);
+    PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
+    return -1;
+  }
+
+  Packet *front = input_.front();
+  size_t to_read =
+      std::min(static_cast<size_t>(len), front->len() - front->offset());
+  memcpy(data, static_cast<const void *>(front->data() + front->offset()),
+         to_read);
+  front->Advance(to_read);
+
+  if (!front->remaining()) {
+    input_.pop();
+    delete front;
+  }
+
+  return static_cast<int32_t>(to_read);
+}
+
+int32_t DummyPrSocket::Recv(void *buf, int32_t buflen) {
+  if (input_.empty()) {
+    PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
+    return -1;
+  }
+
+  Packet *front = input_.front();
+  if (static_cast<size_t>(buflen) < front->len()) {
+    PR_ASSERT(false);
+    PR_SetError(PR_BUFFER_OVERFLOW_ERROR, 0);
+    return -1;
+  }
+
+  size_t count = front->len();
+  memcpy(buf, front->data(), count);
+
+  input_.pop();
+  delete front;
+
+  return static_cast<int32_t>(count);
+}
+
+int32_t DummyPrSocket::Write(const void *buf, int32_t length) {
+  if (!peer_ || !writeable_) {
+    PR_SetError(PR_IO_ERROR, 0);
+    return -1;
+  }
+
+  DataBuffer packet(static_cast<const uint8_t *>(buf),
+                    static_cast<size_t>(length));
+  DataBuffer filtered;
+  PacketFilter::Action action = PacketFilter::KEEP;
+  if (filter_) {
+    action = filter_->Filter(packet, &filtered);
+  }
+  switch (action) {
+    case PacketFilter::CHANGE:
+      LOG("Original packet: " << packet);
+      LOG("Filtered packet: " << filtered);
+      peer_->PacketReceived(filtered);
+      break;
+    case PacketFilter::DROP:
+      LOG("Droppped packet: " << packet);
+      break;
+    case PacketFilter::KEEP:
+      LOGV("Packet: " << packet);
+      peer_->PacketReceived(packet);
+      break;
+  }
+  // libssl can't handle it if this reports something other than the length
+  // of what was passed in (or less, but we're not doing partial writes).
+  return static_cast<int32_t>(packet.len());
+}
+
+Poller *Poller::instance;
+
+Poller *Poller::Instance() {
+  if (!instance) instance = new Poller();
+
+  return instance;
+}
+
+void Poller::Shutdown() {
+  delete instance;
+  instance = nullptr;
+}
+
+Poller::~Poller() {
+  while (!timers_.empty()) {
+    Timer *timer = timers_.top();
+    timers_.pop();
+    delete timer;
+  }
+}
+
+void Poller::Wait(Event event, DummyPrSocket *adapter, PollTarget *target,
+                  PollCallback cb) {
+  auto it = waiters_.find(adapter);
+  Waiter *waiter;
+
+  if (it == waiters_.end()) {
+    waiter = new Waiter(adapter);
+  } else {
+    waiter = it->second;
+  }
+
+  assert(event < TIMER_EVENT);
+  if (event >= TIMER_EVENT) return;
+
+  waiter->targets_[event] = target;
+  waiter->callbacks_[event] = cb;
+  waiters_[adapter] = waiter;
+}
+
+void Poller::Cancel(Event event, DummyPrSocket *adapter) {
+  auto it = waiters_.find(adapter);
+  Waiter *waiter;
+
+  if (it == waiters_.end()) {
+    return;
+  }
+
+  waiter = it->second;
+
+  waiter->targets_[event] = nullptr;
+  waiter->callbacks_[event] = nullptr;
+
+  // Clean up if there are no callbacks.
+  for (size_t i = 0; i < TIMER_EVENT; ++i) {
+    if (waiter->callbacks_[i]) return;
+  }
+
+  delete waiter;
+  waiters_.erase(adapter);
+}
+
+void Poller::SetTimer(uint32_t timer_ms, PollTarget *target, PollCallback cb,
+                      Timer **timer) {
+  Timer *t = new Timer(PR_Now() + timer_ms * 1000, target, cb);
+  timers_.push(t);
+  if (timer) *timer = t;
+}
+
+bool Poller::Poll() {
+  if (g_ssl_gtest_verbose) {
+    std::cerr << "Poll() waiters = " << waiters_.size()
+              << " timers = " << timers_.size() << std::endl;
+  }
+  PRIntervalTime timeout = PR_INTERVAL_NO_TIMEOUT;
+  PRTime now = PR_Now();
+  bool fired = false;
+
+  // Figure out the timer for the select.
+  if (!timers_.empty()) {
+    Timer *first_timer = timers_.top();
+    if (now >= first_timer->deadline_) {
+      // Timer expired.
+      timeout = PR_INTERVAL_NO_WAIT;
+    } else {
+      timeout =
+          PR_MillisecondsToInterval((first_timer->deadline_ - now) / 1000);
+    }
+  }
+
+  for (auto it = waiters_.begin(); it != waiters_.end(); ++it) {
+    Waiter *waiter = it->second;
+
+    if (waiter->callbacks_[READABLE_EVENT]) {
+      if (waiter->io_->readable()) {
+        PollCallback callback = waiter->callbacks_[READABLE_EVENT];
+        PollTarget *target = waiter->targets_[READABLE_EVENT];
+        waiter->callbacks_[READABLE_EVENT] = nullptr;
+        waiter->targets_[READABLE_EVENT] = nullptr;
+        callback(target, READABLE_EVENT);
+        fired = true;
+      }
+    }
+  }
+
+  if (fired) timeout = PR_INTERVAL_NO_WAIT;
+
+  // Can't wait forever and also have nothing readable now.
+  if (timeout == PR_INTERVAL_NO_TIMEOUT) return false;
+
+  // Sleep.
+  if (timeout != PR_INTERVAL_NO_WAIT) {
+    PR_Sleep(timeout);
+  }
+
+  // Now process anything that timed out.
+  now = PR_Now();
+  while (!timers_.empty()) {
+    if (now < timers_.top()->deadline_) break;
+
+    Timer *timer = timers_.top();
+    timers_.pop();
+    if (timer->callback_) {
+      timer->callback_(timer->target_, TIMER_EVENT);
+    }
+    delete timer;
+  }
+
+  return true;
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/test_io.h b/security/nss/gtests/ssl_gtest/test_io.h
new file mode 100644
index 0000000000..b78db0dc65
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/test_io.h
@@ -0,0 +1,152 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef test_io_h_
+#define test_io_h_
+
+#include <string.h>
+#include <map>
+#include <memory>
+#include <ostream>
+#include <queue>
+#include <string>
+
+#include "prio.h"
+
+namespace nss_test {
+
+class DataBuffer;
+class Packet;
+class DummyPrSocket;  // Fwd decl.
+
+// Allow us to inspect a packet before it is written.
+class PacketFilter {
+ public:
+  enum Action {
+    KEEP,    // keep the original packet unmodified
+    CHANGE,  // change the packet to a different value
+    DROP     // drop the packet
+  };
+
+  virtual ~PacketFilter() {}
+
+  // The packet filter takes input and has the option of mutating it.
+  //
+  // A filter that modifies the data places the modified data in *output and
+  // returns CHANGE.  A filter that does not modify data returns LEAVE, in which
+  // case the value in *output is ignored.  A Filter can return DROP, in which
+  // case the packet is dropped (and *output is ignored).
+  virtual Action Filter(const DataBuffer& input, DataBuffer* output) = 0;
+};
+
+enum Mode { STREAM, DGRAM };
+
+inline std::ostream& operator<<(std::ostream& os, Mode m) {
+  return os << ((m == STREAM) ? "TLS" : "DTLS");
+}
+
+class DummyPrSocket {
+ public:
+  ~DummyPrSocket();
+
+  static PRFileDesc* CreateFD(const std::string& name,
+                              Mode mode);  // Returns an FD.
+  static DummyPrSocket* GetAdapter(PRFileDesc* fd);
+
+  DummyPrSocket* peer() const { return peer_; }
+  void SetPeer(DummyPrSocket* peer) { peer_ = peer; }
+  void SetPacketFilter(PacketFilter* filter);
+  // Drops peer, packet filter and any outstanding packets.
+  void Reset();
+
+  void PacketReceived(const DataBuffer& data);
+  int32_t Read(void* data, int32_t len);
+  int32_t Recv(void* buf, int32_t buflen);
+  int32_t Write(const void* buf, int32_t length);
+  void CloseWrites() { writeable_ = false; }
+
+  Mode mode() const { return mode_; }
+  bool readable() const { return !input_.empty(); }
+
+ private:
+  DummyPrSocket(const std::string& name, Mode mode)
+      : name_(name),
+        mode_(mode),
+        peer_(nullptr),
+        input_(),
+        filter_(nullptr),
+        writeable_(true) {}
+
+  const std::string name_;
+  Mode mode_;
+  DummyPrSocket* peer_;
+  std::queue<Packet*> input_;
+  PacketFilter* filter_;
+  bool writeable_;
+};
+
+// Marker interface.
+class PollTarget {};
+
+enum Event { READABLE_EVENT, TIMER_EVENT /* Must be last */ };
+
+typedef void (*PollCallback)(PollTarget*, Event);
+
+class Poller {
+ public:
+  static Poller* Instance();  // Get a singleton.
+  static void Shutdown();     // Shut it down.
+
+  class Timer {
+   public:
+    Timer(PRTime deadline, PollTarget* target, PollCallback callback)
+        : deadline_(deadline), target_(target), callback_(callback) {}
+    void Cancel() { callback_ = nullptr; }
+
+    PRTime deadline_;
+    PollTarget* target_;
+    PollCallback callback_;
+  };
+
+  void Wait(Event event, DummyPrSocket* adapter, PollTarget* target,
+            PollCallback cb);
+  void Cancel(Event event, DummyPrSocket* adapter);
+  void SetTimer(uint32_t timer_ms, PollTarget* target, PollCallback cb,
+                Timer** handle);
+  bool Poll();
+
+ private:
+  Poller() : waiters_(), timers_() {}
+  ~Poller();
+
+  class Waiter {
+   public:
+    Waiter(DummyPrSocket* io) : io_(io) {
+      memset(&callbacks_[0], 0, sizeof(callbacks_));
+    }
+
+    void WaitFor(Event event, PollCallback callback);
+
+    DummyPrSocket* io_;
+    PollTarget* targets_[TIMER_EVENT];
+    PollCallback callbacks_[TIMER_EVENT];
+  };
+
+  class TimerComparator {
+   public:
+    bool operator()(const Timer* lhs, const Timer* rhs) {
+      return lhs->deadline_ > rhs->deadline_;
+    }
+  };
+
+  static Poller* instance;
+  std::map<DummyPrSocket*, Waiter*> waiters_;
+  std::priority_queue<Timer*, std::vector<Timer*>, TimerComparator> timers_;
+};
+
+}  // end of namespace
+
+#endif
diff --git a/security/nss/gtests/ssl_gtest/tls_agent.cc b/security/nss/gtests/ssl_gtest/tls_agent.cc
new file mode 100644
index 0000000000..b75bba5677
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_agent.cc
@@ -0,0 +1,992 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "tls_agent.h"
+#include "databuffer.h"
+#include "keyhi.h"
+#include "pk11func.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+#include "tls_parser.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#define GTEST_HAS_RTTI 0
+#include "gtest/gtest.h"
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+
+extern std::string g_working_dir_path;
+
+namespace nss_test {
+
+const char* TlsAgent::states[] = {"INIT", "CONNECTING", "CONNECTED", "ERROR"};
+
+const std::string TlsAgent::kClient = "client";    // both sign and encrypt
+const std::string TlsAgent::kRsa2048 = "rsa2048";  // bigger
+const std::string TlsAgent::kServerRsa = "rsa";    // both sign and encrypt
+const std::string TlsAgent::kServerRsaSign = "rsa_sign";
+const std::string TlsAgent::kServerRsaPss = "rsa_pss";
+const std::string TlsAgent::kServerRsaDecrypt = "rsa_decrypt";
+const std::string TlsAgent::kServerRsaChain = "rsa_chain";
+const std::string TlsAgent::kServerEcdsa256 = "ecdsa256";
+const std::string TlsAgent::kServerEcdsa384 = "ecdsa384";
+const std::string TlsAgent::kServerEcdsa521 = "ecdsa521";
+const std::string TlsAgent::kServerEcdhRsa = "ecdh_rsa";
+const std::string TlsAgent::kServerEcdhEcdsa = "ecdh_ecdsa";
+const std::string TlsAgent::kServerDsa = "dsa";
+
+TlsAgent::TlsAgent(const std::string& name, Role role, Mode mode)
+    : name_(name),
+      mode_(mode),
+      server_key_bits_(0),
+      pr_fd_(nullptr),
+      adapter_(nullptr),
+      ssl_fd_(nullptr),
+      role_(role),
+      state_(STATE_INIT),
+      timer_handle_(nullptr),
+      falsestart_enabled_(false),
+      expected_version_(0),
+      expected_cipher_suite_(0),
+      expect_resumption_(false),
+      expect_client_auth_(false),
+      can_falsestart_hook_called_(false),
+      sni_hook_called_(false),
+      auth_certificate_hook_called_(false),
+      handshake_callback_called_(false),
+      error_code_(0),
+      send_ctr_(0),
+      recv_ctr_(0),
+      expect_readwrite_error_(false),
+      handshake_callback_(),
+      auth_certificate_callback_(),
+      sni_callback_(),
+      expect_short_headers_(false) {
+  memset(&info_, 0, sizeof(info_));
+  memset(&csinfo_, 0, sizeof(csinfo_));
+  SECStatus rv = SSL_VersionRangeGetDefault(
+      mode_ == STREAM ? ssl_variant_stream : ssl_variant_datagram, &vrange_);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+TlsAgent::~TlsAgent() {
+  if (adapter_) {
+    Poller::Instance()->Cancel(READABLE_EVENT, adapter_);
+    // The adapter is closed when the FD closes.
+  }
+  if (timer_handle_) {
+    timer_handle_->Cancel();
+  }
+
+  if (pr_fd_) {
+    PR_Close(pr_fd_);
+  }
+
+  if (ssl_fd_) {
+    PR_Close(ssl_fd_);
+  }
+}
+
+void TlsAgent::SetState(State state) {
+  if (state_ == state) return;
+
+  LOG("Changing state from " << state_ << " to " << state);
+  state_ = state;
+}
+
+bool TlsAgent::ConfigServerCert(const std::string& name, bool updateKeyBits,
+                                const SSLExtraServerCertData* serverCertData) {
+  ScopedCERTCertificate cert(PK11_FindCertFromNickname(name.c_str(), nullptr));
+  EXPECT_NE(nullptr, cert.get());
+  if (!cert.get()) return false;
+
+  ScopedSECKEYPublicKey pub(CERT_ExtractPublicKey(cert.get()));
+  EXPECT_NE(nullptr, pub.get());
+  if (!pub.get()) return false;
+  if (updateKeyBits) {
+    server_key_bits_ = SECKEY_PublicKeyStrengthInBits(pub.get());
+  }
+
+  ScopedSECKEYPrivateKey priv(PK11_FindKeyByAnyCert(cert.get(), nullptr));
+  EXPECT_NE(nullptr, priv.get());
+  if (!priv.get()) return false;
+
+  SECStatus rv =
+      SSL_ConfigSecureServer(ssl_fd_, nullptr, nullptr, ssl_kea_null);
+  EXPECT_EQ(SECFailure, rv);
+  rv = SSL_ConfigServerCert(ssl_fd_, cert.get(), priv.get(), serverCertData,
+                            serverCertData ? sizeof(*serverCertData) : 0);
+  return rv == SECSuccess;
+}
+
+bool TlsAgent::EnsureTlsSetup(PRFileDesc* modelSocket) {
+  // Don't set up twice
+  if (ssl_fd_) return true;
+
+  if (adapter_->mode() == STREAM) {
+    ssl_fd_ = SSL_ImportFD(modelSocket, pr_fd_);
+  } else {
+    ssl_fd_ = DTLS_ImportFD(modelSocket, pr_fd_);
+  }
+
+  EXPECT_NE(nullptr, ssl_fd_);
+  if (!ssl_fd_) return false;
+  pr_fd_ = nullptr;
+
+  SECStatus rv = SSL_VersionRangeSet(ssl_fd_, &vrange_);
+  EXPECT_EQ(SECSuccess, rv);
+  if (rv != SECSuccess) return false;
+
+  if (role_ == SERVER) {
+    EXPECT_TRUE(ConfigServerCert(name_, true));
+
+    rv = SSL_SNISocketConfigHook(ssl_fd_, SniHook, this);
+    EXPECT_EQ(SECSuccess, rv);
+    if (rv != SECSuccess) return false;
+
+    ScopedCERTCertList anchors(CERT_NewCertList());
+    rv = SSL_SetTrustAnchors(ssl_fd_, anchors.get());
+    if (rv != SECSuccess) return false;
+  } else {
+    rv = SSL_SetURL(ssl_fd_, "server");
+    EXPECT_EQ(SECSuccess, rv);
+    if (rv != SECSuccess) return false;
+  }
+
+  rv = SSL_AuthCertificateHook(ssl_fd_, AuthCertificateHook, this);
+  EXPECT_EQ(SECSuccess, rv);
+  if (rv != SECSuccess) return false;
+
+  rv = SSL_HandshakeCallback(ssl_fd_, HandshakeCallback, this);
+  EXPECT_EQ(SECSuccess, rv);
+  if (rv != SECSuccess) return false;
+
+  return true;
+}
+
+void TlsAgent::SetupClientAuth() {
+  EXPECT_TRUE(EnsureTlsSetup());
+  ASSERT_EQ(CLIENT, role_);
+
+  EXPECT_EQ(SECSuccess,
+            SSL_GetClientAuthDataHook(ssl_fd_, GetClientAuthDataHook,
+                                      reinterpret_cast<void*>(this)));
+}
+
+bool TlsAgent::GetClientAuthCredentials(CERTCertificate** cert,
+                                        SECKEYPrivateKey** priv) const {
+  *cert = PK11_FindCertFromNickname(name_.c_str(), nullptr);
+  EXPECT_NE(nullptr, *cert);
+  if (!*cert) return false;
+
+  *priv = PK11_FindKeyByAnyCert(*cert, nullptr);
+  EXPECT_NE(nullptr, *priv);
+  if (!*priv) return false;  // Leak cert.
+
+  return true;
+}
+
+SECStatus TlsAgent::GetClientAuthDataHook(void* self, PRFileDesc* fd,
+                                          CERTDistNames* caNames,
+                                          CERTCertificate** cert,
+                                          SECKEYPrivateKey** privKey) {
+  TlsAgent* agent = reinterpret_cast<TlsAgent*>(self);
+  ScopedCERTCertificate peerCert(SSL_PeerCertificate(agent->ssl_fd()));
+  EXPECT_TRUE(peerCert) << "Client should be able to see the server cert";
+  if (agent->GetClientAuthCredentials(cert, privKey)) {
+    return SECSuccess;
+  }
+  return SECFailure;
+}
+
+bool TlsAgent::GetPeerChainLength(size_t* count) {
+  CERTCertList* chain = SSL_PeerCertificateChain(ssl_fd_);
+  if (!chain) return false;
+  *count = 0;
+
+  for (PRCList* cursor = PR_NEXT_LINK(&chain->list); cursor != &chain->list;
+       cursor = PR_NEXT_LINK(cursor)) {
+    CERTCertListNode* node = (CERTCertListNode*)cursor;
+    std::cerr << node->cert->subjectName << std::endl;
+    ++(*count);
+  }
+
+  CERT_DestroyCertList(chain);
+
+  return true;
+}
+
+void TlsAgent::RequestClientAuth(bool requireAuth) {
+  EXPECT_TRUE(EnsureTlsSetup());
+  ASSERT_EQ(SERVER, role_);
+
+  EXPECT_EQ(SECSuccess,
+            SSL_OptionSet(ssl_fd_, SSL_REQUEST_CERTIFICATE, PR_TRUE));
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(ssl_fd_, SSL_REQUIRE_CERTIFICATE,
+                                      requireAuth ? PR_TRUE : PR_FALSE));
+
+  EXPECT_EQ(SECSuccess, SSL_AuthCertificateHook(
+                            ssl_fd_, &TlsAgent::ClientAuthenticated, this));
+  expect_client_auth_ = true;
+}
+
+void TlsAgent::StartConnect(PRFileDesc* model) {
+  EXPECT_TRUE(EnsureTlsSetup(model));
+
+  SECStatus rv;
+  rv = SSL_ResetHandshake(ssl_fd_, role_ == SERVER ? PR_TRUE : PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+  SetState(STATE_CONNECTING);
+}
+
+void TlsAgent::DisableAllCiphers() {
+  for (size_t i = 0; i < SSL_NumImplementedCiphers; ++i) {
+    SECStatus rv =
+        SSL_CipherPrefSet(ssl_fd_, SSL_ImplementedCiphers[i], PR_FALSE);
+    EXPECT_EQ(SECSuccess, rv);
+  }
+}
+
+// Not actually all groups, just the onece that we are actually willing
+// to use.
+const std::vector<SSLNamedGroup> kAllDHEGroups = {
+    ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1,
+    ssl_grp_ec_secp521r1,  ssl_grp_ffdhe_2048,   ssl_grp_ffdhe_3072,
+    ssl_grp_ffdhe_4096,    ssl_grp_ffdhe_6144,   ssl_grp_ffdhe_8192};
+
+const std::vector<SSLNamedGroup> kECDHEGroups = {
+    ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1,
+    ssl_grp_ec_secp521r1};
+
+const std::vector<SSLNamedGroup> kFFDHEGroups = {
+    ssl_grp_ffdhe_2048, ssl_grp_ffdhe_3072, ssl_grp_ffdhe_4096,
+    ssl_grp_ffdhe_6144, ssl_grp_ffdhe_8192};
+
+// Defined because the big DHE groups are ridiculously slow.
+const std::vector<SSLNamedGroup> kFasterDHEGroups = {
+    ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1,
+    ssl_grp_ffdhe_2048, ssl_grp_ffdhe_3072};
+
+void TlsAgent::EnableCiphersByKeyExchange(SSLKEAType kea) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  for (size_t i = 0; i < SSL_NumImplementedCiphers; ++i) {
+    SSLCipherSuiteInfo csinfo;
+
+    SECStatus rv = SSL_GetCipherSuiteInfo(SSL_ImplementedCiphers[i], &csinfo,
+                                          sizeof(csinfo));
+    ASSERT_EQ(SECSuccess, rv);
+    EXPECT_EQ(sizeof(csinfo), csinfo.length);
+
+    if ((csinfo.keaType == kea) || (csinfo.keaType == ssl_kea_tls13_any)) {
+      rv = SSL_CipherPrefSet(ssl_fd_, SSL_ImplementedCiphers[i], PR_TRUE);
+      EXPECT_EQ(SECSuccess, rv);
+    }
+  }
+}
+
+void TlsAgent::EnableGroupsByKeyExchange(SSLKEAType kea) {
+  switch (kea) {
+    case ssl_kea_dh:
+      ConfigNamedGroups(kFFDHEGroups);
+      break;
+    case ssl_kea_ecdh:
+      ConfigNamedGroups(kECDHEGroups);
+      break;
+    default:
+      break;
+  }
+}
+
+void TlsAgent::EnableGroupsByAuthType(SSLAuthType authType) {
+  if (authType == ssl_auth_ecdh_rsa || authType == ssl_auth_ecdh_ecdsa ||
+      authType == ssl_auth_ecdsa || authType == ssl_auth_tls13_any) {
+    ConfigNamedGroups(kECDHEGroups);
+  }
+}
+
+void TlsAgent::EnableCiphersByAuthType(SSLAuthType authType) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  for (size_t i = 0; i < SSL_NumImplementedCiphers; ++i) {
+    SSLCipherSuiteInfo csinfo;
+
+    SECStatus rv = SSL_GetCipherSuiteInfo(SSL_ImplementedCiphers[i], &csinfo,
+                                          sizeof(csinfo));
+    ASSERT_EQ(SECSuccess, rv);
+
+    if ((csinfo.authType == authType) ||
+        (csinfo.keaType == ssl_kea_tls13_any)) {
+      rv = SSL_CipherPrefSet(ssl_fd_, SSL_ImplementedCiphers[i], PR_TRUE);
+      EXPECT_EQ(SECSuccess, rv);
+    }
+  }
+}
+
+void TlsAgent::EnableSingleCipher(uint16_t cipher) {
+  DisableAllCiphers();
+  SECStatus rv = SSL_CipherPrefSet(ssl_fd_, cipher, PR_TRUE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::ConfigNamedGroups(const std::vector<SSLNamedGroup>& groups) {
+  EXPECT_TRUE(EnsureTlsSetup());
+  SECStatus rv = SSL_NamedGroupConfig(ssl_fd_, &groups[0], groups.size());
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::SetSessionTicketsEnabled(bool en) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSL_OptionSet(ssl_fd_, SSL_ENABLE_SESSION_TICKETS,
+                               en ? PR_TRUE : PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::SetSessionCacheEnabled(bool en) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSL_OptionSet(ssl_fd_, SSL_NO_CACHE, en ? PR_FALSE : PR_TRUE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::Set0RttEnabled(bool en) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv =
+      SSL_OptionSet(ssl_fd_, SSL_ENABLE_0RTT_DATA, en ? PR_TRUE : PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::SetShortHeadersEnabled() {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSLInt_EnableShortHeaders(ssl_fd_);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::SetVersionRange(uint16_t minver, uint16_t maxver) {
+  vrange_.min = minver;
+  vrange_.max = maxver;
+
+  if (ssl_fd_) {
+    SECStatus rv = SSL_VersionRangeSet(ssl_fd_, &vrange_);
+    EXPECT_EQ(SECSuccess, rv);
+  }
+}
+
+void TlsAgent::GetVersionRange(uint16_t* minver, uint16_t* maxver) {
+  *minver = vrange_.min;
+  *maxver = vrange_.max;
+}
+
+void TlsAgent::SetExpectedVersion(uint16_t version) {
+  expected_version_ = version;
+}
+
+void TlsAgent::SetServerKeyBits(uint16_t bits) { server_key_bits_ = bits; }
+
+void TlsAgent::ExpectReadWriteError() { expect_readwrite_error_ = true; }
+
+void TlsAgent::ExpectShortHeaders() { expect_short_headers_ = true; }
+
+void TlsAgent::SetSignatureSchemes(const SSLSignatureScheme* schemes,
+                                   size_t count) {
+  EXPECT_TRUE(EnsureTlsSetup());
+  EXPECT_LE(count, SSL_SignatureMaxCount());
+  EXPECT_EQ(SECSuccess,
+            SSL_SignatureSchemePrefSet(ssl_fd_, schemes,
+                                       static_cast<unsigned int>(count)));
+  EXPECT_EQ(SECFailure, SSL_SignatureSchemePrefSet(ssl_fd_, schemes, 0))
+      << "setting no schemes should fail and do nothing";
+
+  std::vector<SSLSignatureScheme> configuredSchemes(count);
+  unsigned int configuredCount;
+  EXPECT_EQ(SECFailure,
+            SSL_SignatureSchemePrefGet(ssl_fd_, nullptr, &configuredCount, 1))
+      << "get schemes, schemes is nullptr";
+  EXPECT_EQ(SECFailure,
+            SSL_SignatureSchemePrefGet(ssl_fd_, &configuredSchemes[0],
+                                       &configuredCount, 0))
+      << "get schemes, too little space";
+  EXPECT_EQ(SECFailure,
+            SSL_SignatureSchemePrefGet(ssl_fd_, &configuredSchemes[0], nullptr,
+                                       configuredSchemes.size()))
+      << "get schemes, countOut is nullptr";
+
+  EXPECT_EQ(SECSuccess, SSL_SignatureSchemePrefGet(
+                            ssl_fd_, &configuredSchemes[0], &configuredCount,
+                            configuredSchemes.size()));
+  // SignatureSchemePrefSet drops unsupported algorithms silently, so the
+  // number that are configured might be fewer.
+  EXPECT_LE(configuredCount, count);
+  unsigned int i = 0;
+  for (unsigned int j = 0; j < count && i < configuredCount; ++j) {
+    if (i < configuredCount && schemes[j] == configuredSchemes[i]) {
+      ++i;
+    }
+  }
+  EXPECT_EQ(i, configuredCount) << "schemes in use were all set";
+}
+
+void TlsAgent::CheckKEA(SSLKEAType kea_type, SSLNamedGroup kea_group,
+                        size_t kea_size) const {
+  EXPECT_EQ(STATE_CONNECTED, state_);
+  EXPECT_EQ(kea_type, info_.keaType);
+  if (kea_size == 0) {
+    switch (kea_group) {
+      case ssl_grp_ec_curve25519:
+        kea_size = 255;
+        break;
+      case ssl_grp_ec_secp256r1:
+        kea_size = 256;
+        break;
+      case ssl_grp_ec_secp384r1:
+        kea_size = 384;
+        break;
+      case ssl_grp_ffdhe_2048:
+        kea_size = 2048;
+        break;
+      case ssl_grp_ffdhe_3072:
+        kea_size = 3072;
+        break;
+      case ssl_grp_ffdhe_custom:
+        break;
+      default:
+        if (kea_type == ssl_kea_rsa) {
+          kea_size = server_key_bits_;
+        } else {
+          EXPECT_TRUE(false) << "need to update group sizes";
+        }
+    }
+  }
+  if (kea_group != ssl_grp_ffdhe_custom) {
+    EXPECT_EQ(kea_size, info_.keaKeyBits);
+    EXPECT_EQ(kea_group, info_.keaGroup);
+  }
+}
+
+void TlsAgent::CheckAuthType(SSLAuthType auth_type,
+                             SSLSignatureScheme sig_scheme) const {
+  EXPECT_EQ(STATE_CONNECTED, state_);
+  EXPECT_EQ(auth_type, info_.authType);
+  EXPECT_EQ(server_key_bits_, info_.authKeyBits);
+  if (expected_version_ < SSL_LIBRARY_VERSION_TLS_1_2) {
+    switch (auth_type) {
+      case ssl_auth_rsa_sign:
+        sig_scheme = ssl_sig_rsa_pkcs1_sha1md5;
+        break;
+      case ssl_auth_ecdsa:
+        sig_scheme = ssl_sig_ecdsa_sha1;
+        break;
+      default:
+        break;
+    }
+  }
+  EXPECT_EQ(sig_scheme, info_.signatureScheme);
+
+  if (info_.protocolVersion >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    return;
+  }
+
+  // Check authAlgorithm, which is the old value for authType.  This is a second
+  // switch
+  // statement because default label is different.
+  switch (auth_type) {
+    case ssl_auth_rsa_sign:
+      EXPECT_EQ(ssl_auth_rsa_decrypt, csinfo_.authAlgorithm)
+          << "authAlgorithm for RSA is always decrypt";
+      break;
+    case ssl_auth_ecdh_rsa:
+      EXPECT_EQ(ssl_auth_rsa_decrypt, csinfo_.authAlgorithm)
+          << "authAlgorithm for ECDH_RSA is RSA decrypt (i.e., wrong)";
+      break;
+    case ssl_auth_ecdh_ecdsa:
+      EXPECT_EQ(ssl_auth_ecdsa, csinfo_.authAlgorithm)
+          << "authAlgorithm for ECDH_ECDSA is ECDSA (i.e., wrong)";
+      break;
+    default:
+      EXPECT_EQ(auth_type, csinfo_.authAlgorithm)
+          << "authAlgorithm is (usually) the same as authType";
+      break;
+  }
+}
+
+void TlsAgent::EnableFalseStart() {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  falsestart_enabled_ = true;
+  EXPECT_EQ(SECSuccess,
+            SSL_SetCanFalseStartCallback(ssl_fd_, CanFalseStartCallback, this));
+  EXPECT_EQ(SECSuccess,
+            SSL_OptionSet(ssl_fd_, SSL_ENABLE_FALSE_START, PR_TRUE));
+}
+
+void TlsAgent::ExpectResumption() { expect_resumption_ = true; }
+
+void TlsAgent::EnableAlpn(const uint8_t* val, size_t len) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  EXPECT_EQ(SECSuccess, SSL_OptionSet(ssl_fd_, SSL_ENABLE_ALPN, PR_TRUE));
+  EXPECT_EQ(SECSuccess, SSL_SetNextProtoNego(ssl_fd_, val, len));
+}
+
+void TlsAgent::CheckAlpn(SSLNextProtoState expected_state,
+                         const std::string& expected) const {
+  SSLNextProtoState state;
+  char chosen[10];
+  unsigned int chosen_len;
+  SECStatus rv = SSL_GetNextProto(ssl_fd_, &state,
+                                  reinterpret_cast<unsigned char*>(chosen),
+                                  &chosen_len, sizeof(chosen));
+  EXPECT_EQ(SECSuccess, rv);
+  EXPECT_EQ(expected_state, state);
+  if (state == SSL_NEXT_PROTO_NO_SUPPORT) {
+    EXPECT_EQ("", expected);
+  } else {
+    EXPECT_NE("", expected);
+    EXPECT_EQ(expected, std::string(chosen, chosen_len));
+  }
+}
+
+void TlsAgent::EnableSrtp() {
+  EXPECT_TRUE(EnsureTlsSetup());
+  const uint16_t ciphers[] = {SRTP_AES128_CM_HMAC_SHA1_80,
+                              SRTP_AES128_CM_HMAC_SHA1_32};
+  EXPECT_EQ(SECSuccess,
+            SSL_SetSRTPCiphers(ssl_fd_, ciphers, PR_ARRAY_SIZE(ciphers)));
+}
+
+void TlsAgent::CheckSrtp() const {
+  uint16_t actual;
+  EXPECT_EQ(SECSuccess, SSL_GetSRTPCipher(ssl_fd_, &actual));
+  EXPECT_EQ(SRTP_AES128_CM_HMAC_SHA1_80, actual);
+}
+
+void TlsAgent::CheckErrorCode(int32_t expected) const {
+  EXPECT_EQ(STATE_ERROR, state_);
+  EXPECT_EQ(expected, error_code_)
+      << "Got error code " << PORT_ErrorToName(error_code_) << " expecting "
+      << PORT_ErrorToName(expected) << std::endl;
+}
+
+void TlsAgent::WaitForErrorCode(int32_t expected, uint32_t delay) const {
+  ASSERT_EQ(0, error_code_);
+  WAIT_(error_code_ != 0, delay);
+  EXPECT_EQ(expected, error_code_)
+      << "Got error code " << PORT_ErrorToName(error_code_) << " expecting "
+      << PORT_ErrorToName(expected) << std::endl;
+}
+
+void TlsAgent::CheckPreliminaryInfo() {
+  SSLPreliminaryChannelInfo info;
+  EXPECT_EQ(SECSuccess,
+            SSL_GetPreliminaryChannelInfo(ssl_fd_, &info, sizeof(info)));
+  EXPECT_EQ(sizeof(info), info.length);
+  EXPECT_TRUE(info.valuesSet & ssl_preinfo_version);
+  EXPECT_TRUE(info.valuesSet & ssl_preinfo_cipher_suite);
+
+  // A version of 0 is invalid and indicates no expectation.  This value is
+  // initialized to 0 so that tests that don't explicitly set an expected
+  // version can negotiate a version.
+  if (!expected_version_) {
+    expected_version_ = info.protocolVersion;
+  }
+  EXPECT_EQ(expected_version_, info.protocolVersion);
+
+  // As with the version; 0 is the null cipher suite (and also invalid).
+  if (!expected_cipher_suite_) {
+    expected_cipher_suite_ = info.cipherSuite;
+  }
+  EXPECT_EQ(expected_cipher_suite_, info.cipherSuite);
+}
+
+// Check that all the expected callbacks have been called.
+void TlsAgent::CheckCallbacks() const {
+  // If false start happens, the handshake is reported as being complete at the
+  // point that false start happens.
+  if (expect_resumption_ || !falsestart_enabled_) {
+    EXPECT_TRUE(handshake_callback_called_);
+  }
+
+  // These callbacks shouldn't fire if we are resuming, except on TLS 1.3.
+  if (role_ == SERVER) {
+    PRBool have_sni = SSLInt_ExtensionNegotiated(ssl_fd_, ssl_server_name_xtn);
+    EXPECT_EQ(((!expect_resumption_ && have_sni) ||
+               expected_version_ >= SSL_LIBRARY_VERSION_TLS_1_3),
+              sni_hook_called_);
+  } else {
+    EXPECT_EQ(!expect_resumption_, auth_certificate_hook_called_);
+    // Note that this isn't unconditionally called, even with false start on.
+    // But the callback is only skipped if a cipher that is ridiculously weak
+    // (80 bits) is chosen.  Don't test that: plan to remove bad ciphers.
+    EXPECT_EQ(falsestart_enabled_ && !expect_resumption_,
+              can_falsestart_hook_called_);
+  }
+}
+
+void TlsAgent::ResetPreliminaryInfo() {
+  expected_version_ = 0;
+  expected_cipher_suite_ = 0;
+}
+
+void TlsAgent::Connected() {
+  LOG("Handshake success");
+  CheckPreliminaryInfo();
+  CheckCallbacks();
+
+  SECStatus rv = SSL_GetChannelInfo(ssl_fd_, &info_, sizeof(info_));
+  EXPECT_EQ(SECSuccess, rv);
+  EXPECT_EQ(sizeof(info_), info_.length);
+
+  // Preliminary values are exposed through callbacks during the handshake.
+  // If either expected values were set or the callbacks were called, check
+  // that the final values are correct.
+  EXPECT_EQ(expected_version_, info_.protocolVersion);
+  EXPECT_EQ(expected_cipher_suite_, info_.cipherSuite);
+
+  rv = SSL_GetCipherSuiteInfo(info_.cipherSuite, &csinfo_, sizeof(csinfo_));
+  EXPECT_EQ(SECSuccess, rv);
+  EXPECT_EQ(sizeof(csinfo_), csinfo_.length);
+
+  if (expected_version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    PRInt32 cipherSuites = SSLInt_CountTls13CipherSpecs(ssl_fd_);
+    // We use one ciphersuite in each direction, plus one that's kept around
+    // by DTLS for retransmission.
+    PRInt32 expected = ((mode_ == DGRAM) && (role_ == CLIENT)) ? 3 : 2;
+    EXPECT_EQ(expected, cipherSuites);
+    if (expected != cipherSuites) {
+      SSLInt_PrintTls13CipherSpecs(ssl_fd_);
+    }
+  }
+
+  PRBool short_headers;
+  rv = SSLInt_UsingShortHeaders(ssl_fd_, &short_headers);
+  EXPECT_EQ(SECSuccess, rv);
+  EXPECT_EQ((PRBool)expect_short_headers_, short_headers);
+  SetState(STATE_CONNECTED);
+}
+
+void TlsAgent::EnableExtendedMasterSecret() {
+  ASSERT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv =
+      SSL_OptionSet(ssl_fd_, SSL_ENABLE_EXTENDED_MASTER_SECRET, PR_TRUE);
+
+  ASSERT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::CheckExtendedMasterSecret(bool expected) {
+  if (version() >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    expected = PR_TRUE;
+  }
+  ASSERT_EQ(expected, info_.extendedMasterSecretUsed != PR_FALSE)
+      << "unexpected extended master secret state for " << name_;
+}
+
+void TlsAgent::CheckEarlyDataAccepted(bool expected) {
+  if (version() < SSL_LIBRARY_VERSION_TLS_1_3) {
+    expected = false;
+  }
+  ASSERT_EQ(expected, info_.earlyDataAccepted != PR_FALSE)
+      << "unexpected early data state for " << name_;
+}
+
+void TlsAgent::CheckSecretsDestroyed() {
+  ASSERT_EQ(PR_TRUE, SSLInt_CheckSecretsDestroyed(ssl_fd_));
+}
+
+void TlsAgent::DisableRollbackDetection() {
+  ASSERT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSL_OptionSet(ssl_fd_, SSL_ROLLBACK_DETECTION, PR_FALSE);
+
+  ASSERT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::EnableCompression() {
+  ASSERT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSL_OptionSet(ssl_fd_, SSL_ENABLE_DEFLATE, PR_TRUE);
+  ASSERT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::SetDowngradeCheckVersion(uint16_t version) {
+  ASSERT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSL_SetDowngradeCheckVersion(ssl_fd_, version);
+  ASSERT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::Handshake() {
+  LOGV("Handshake");
+  SECStatus rv = SSL_ForceHandshake(ssl_fd_);
+  if (rv == SECSuccess) {
+    Connected();
+
+    Poller::Instance()->Wait(READABLE_EVENT, adapter_, this,
+                             &TlsAgent::ReadableCallback);
+    return;
+  }
+
+  int32_t err = PR_GetError();
+  if (err == PR_WOULD_BLOCK_ERROR) {
+    LOGV("Would have blocked");
+    if (mode_ == DGRAM) {
+      if (timer_handle_) {
+        timer_handle_->Cancel();
+        timer_handle_ = nullptr;
+      }
+
+      PRIntervalTime timeout;
+      rv = DTLS_GetHandshakeTimeout(ssl_fd_, &timeout);
+      if (rv == SECSuccess) {
+        Poller::Instance()->SetTimer(
+            timeout + 1, this, &TlsAgent::ReadableCallback, &timer_handle_);
+      }
+    }
+    Poller::Instance()->Wait(READABLE_EVENT, adapter_, this,
+                             &TlsAgent::ReadableCallback);
+    return;
+  }
+
+  LOG("Handshake failed with error " << PORT_ErrorToName(err) << ": "
+                                     << PORT_ErrorToString(err));
+  error_code_ = err;
+  SetState(STATE_ERROR);
+}
+
+void TlsAgent::PrepareForRenegotiate() {
+  EXPECT_EQ(STATE_CONNECTED, state_);
+
+  SetState(STATE_CONNECTING);
+}
+
+void TlsAgent::StartRenegotiate() {
+  PrepareForRenegotiate();
+
+  SECStatus rv = SSL_ReHandshake(ssl_fd_, PR_TRUE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::SendDirect(const DataBuffer& buf) {
+  LOG("Send Direct " << buf);
+  adapter_->peer()->PacketReceived(buf);
+}
+
+static bool ErrorIsNonFatal(PRErrorCode code) {
+  return code == PR_WOULD_BLOCK_ERROR || code == SSL_ERROR_RX_SHORT_DTLS_READ;
+}
+
+void TlsAgent::SendData(size_t bytes, size_t blocksize) {
+  uint8_t block[4096];
+
+  ASSERT_LT(blocksize, sizeof(block));
+
+  while (bytes) {
+    size_t tosend = std::min(blocksize, bytes);
+
+    for (size_t i = 0; i < tosend; ++i) {
+      block[i] = 0xff & send_ctr_;
+      ++send_ctr_;
+    }
+
+    SendBuffer(DataBuffer(block, tosend));
+    bytes -= tosend;
+  }
+}
+
+void TlsAgent::SendBuffer(const DataBuffer& buf) {
+  LOGV("Writing " << buf.len() << " bytes");
+  int32_t rv = PR_Write(ssl_fd_, buf.data(), buf.len());
+  if (expect_readwrite_error_) {
+    EXPECT_GT(0, rv);
+    EXPECT_NE(PR_WOULD_BLOCK_ERROR, error_code_);
+    error_code_ = PR_GetError();
+    expect_readwrite_error_ = false;
+  } else {
+    ASSERT_EQ(buf.len(), static_cast<size_t>(rv));
+  }
+}
+
+void TlsAgent::ReadBytes() {
+  uint8_t block[1024];
+
+  int32_t rv = PR_Read(ssl_fd_, block, sizeof(block));
+  LOGV("ReadBytes " << rv);
+  int32_t err;
+
+  if (rv >= 0) {
+    size_t count = static_cast<size_t>(rv);
+    for (size_t i = 0; i < count; ++i) {
+      ASSERT_EQ(recv_ctr_ & 0xff, block[i]);
+      recv_ctr_++;
+    }
+  } else {
+    err = PR_GetError();
+    LOG("Read error " << PORT_ErrorToName(err) << ": "
+                      << PORT_ErrorToString(err));
+    if (err != PR_WOULD_BLOCK_ERROR && expect_readwrite_error_) {
+      error_code_ = err;
+      expect_readwrite_error_ = false;
+    }
+  }
+
+  // If closed, then don't bother waiting around.
+  if (rv > 0 || (rv < 0 && ErrorIsNonFatal(err))) {
+    LOGV("Re-arming");
+    Poller::Instance()->Wait(READABLE_EVENT, adapter_, this,
+                             &TlsAgent::ReadableCallback);
+  }
+}
+
+void TlsAgent::ResetSentBytes() { send_ctr_ = 0; }
+
+void TlsAgent::ConfigureSessionCache(SessionResumptionMode mode) {
+  EXPECT_TRUE(EnsureTlsSetup());
+
+  SECStatus rv = SSL_OptionSet(ssl_fd_, SSL_NO_CACHE,
+                               mode & RESUME_SESSIONID ? PR_FALSE : PR_TRUE);
+  EXPECT_EQ(SECSuccess, rv);
+
+  rv = SSL_OptionSet(ssl_fd_, SSL_ENABLE_SESSION_TICKETS,
+                     mode & RESUME_TICKET ? PR_TRUE : PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+void TlsAgent::DisableECDHEServerKeyReuse() {
+  ASSERT_EQ(TlsAgent::SERVER, role_);
+  SECStatus rv = SSL_OptionSet(ssl_fd_, SSL_REUSE_SERVER_ECDHE_KEY, PR_FALSE);
+  EXPECT_EQ(SECSuccess, rv);
+}
+
+static const std::string kTlsRolesAllArr[] = {"CLIENT", "SERVER"};
+::testing::internal::ParamGenerator<std::string>
+    TlsAgentTestBase::kTlsRolesAll = ::testing::ValuesIn(kTlsRolesAllArr);
+
+void TlsAgentTestBase::SetUp() {
+  SSL_ConfigServerSessionIDCache(1024, 0, 0, g_working_dir_path.c_str());
+}
+
+void TlsAgentTestBase::TearDown() {
+  delete agent_;
+  SSL_ClearSessionCache();
+  SSL_ShutdownServerSessionIDCache();
+}
+
+void TlsAgentTestBase::Reset(const std::string& server_name) {
+  delete agent_;
+  Init(server_name);
+}
+
+void TlsAgentTestBase::Init(const std::string& server_name) {
+  agent_ =
+      new TlsAgent(role_ == TlsAgent::CLIENT ? TlsAgent::kClient : server_name,
+                   role_, mode_);
+  agent_->Init();
+  fd_ = DummyPrSocket::CreateFD(agent_->role_str(), mode_);
+  agent_->adapter()->SetPeer(DummyPrSocket::GetAdapter(fd_));
+  agent_->StartConnect();
+}
+
+void TlsAgentTestBase::EnsureInit() {
+  if (!agent_) {
+    Init();
+  }
+  const std::vector<SSLNamedGroup> groups = {
+      ssl_grp_ec_curve25519, ssl_grp_ec_secp256r1, ssl_grp_ec_secp384r1,
+      ssl_grp_ffdhe_2048};
+  agent_->ConfigNamedGroups(groups);
+}
+
+void TlsAgentTestBase::ProcessMessage(const DataBuffer& buffer,
+                                      TlsAgent::State expected_state,
+                                      int32_t error_code) {
+  std::cerr << "Process message: " << buffer << std::endl;
+  EnsureInit();
+  agent_->adapter()->PacketReceived(buffer);
+  agent_->Handshake();
+
+  ASSERT_EQ(expected_state, agent_->state());
+
+  if (expected_state == TlsAgent::STATE_ERROR) {
+    ASSERT_EQ(error_code, agent_->error_code());
+  }
+}
+
+void TlsAgentTestBase::MakeRecord(Mode mode, uint8_t type, uint16_t version,
+                                  const uint8_t* buf, size_t len,
+                                  DataBuffer* out, uint64_t seq_num) {
+  size_t index = 0;
+  index = out->Write(index, type, 1);
+  index = out->Write(
+      index, mode == STREAM ? version : TlsVersionToDtlsVersion(version), 2);
+  if (mode == DGRAM) {
+    index = out->Write(index, seq_num >> 32, 4);
+    index = out->Write(index, seq_num & PR_UINT32_MAX, 4);
+  }
+  index = out->Write(index, len, 2);
+  out->Write(index, buf, len);
+}
+
+void TlsAgentTestBase::MakeRecord(uint8_t type, uint16_t version,
+                                  const uint8_t* buf, size_t len,
+                                  DataBuffer* out, uint64_t seq_num) const {
+  MakeRecord(mode_, type, version, buf, len, out, seq_num);
+}
+
+void TlsAgentTestBase::MakeHandshakeMessage(uint8_t hs_type,
+                                            const uint8_t* data, size_t hs_len,
+                                            DataBuffer* out,
+                                            uint64_t seq_num) const {
+  return MakeHandshakeMessageFragment(hs_type, data, hs_len, out, seq_num, 0,
+                                      0);
+}
+
+void TlsAgentTestBase::MakeHandshakeMessageFragment(
+    uint8_t hs_type, const uint8_t* data, size_t hs_len, DataBuffer* out,
+    uint64_t seq_num, uint32_t fragment_offset,
+    uint32_t fragment_length) const {
+  size_t index = 0;
+  if (!fragment_length) fragment_length = hs_len;
+  index = out->Write(index, hs_type, 1);  // Handshake record type.
+  index = out->Write(index, hs_len, 3);   // Handshake length
+  if (mode_ == DGRAM) {
+    index = out->Write(index, seq_num, 2);
+    index = out->Write(index, fragment_offset, 3);
+    index = out->Write(index, fragment_length, 3);
+  }
+  if (data) {
+    index = out->Write(index, data, fragment_length);
+  } else {
+    for (size_t i = 0; i < fragment_length; ++i) {
+      index = out->Write(index, 1, 1);
+    }
+  }
+}
+
+void TlsAgentTestBase::MakeTrivialHandshakeRecord(uint8_t hs_type,
+                                                  size_t hs_len,
+                                                  DataBuffer* out) {
+  size_t index = 0;
+  index = out->Write(index, kTlsHandshakeType, 1);  // Content Type
+  index = out->Write(index, 3, 1);                  // Version high
+  index = out->Write(index, 1, 1);                  // Version low
+  index = out->Write(index, 4 + hs_len, 2);         // Length
+
+  index = out->Write(index, hs_type, 1);  // Handshake record type.
+  index = out->Write(index, hs_len, 3);   // Handshake length
+  for (size_t i = 0; i < hs_len; ++i) {
+    index = out->Write(index, 1, 1);
+  }
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/tls_agent.h b/security/nss/gtests/ssl_gtest/tls_agent.h
new file mode 100644
index 0000000000..78923c9307
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_agent.h
@@ -0,0 +1,457 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef tls_agent_h_
+#define tls_agent_h_
+
+#include "prio.h"
+#include "ssl.h"
+
+#include <functional>
+#include <iostream>
+
+#include "test_io.h"
+
+#define GTEST_HAS_RTTI 0
+#include "gtest/gtest.h"
+
+extern bool g_ssl_gtest_verbose;
+
+namespace nss_test {
+
+#define LOG(msg) std::cerr << role_str() << ": " << msg << std::endl
+#define LOGV(msg)                      \
+  do {                                 \
+    if (g_ssl_gtest_verbose) LOG(msg); \
+  } while (false)
+
+enum SessionResumptionMode {
+  RESUME_NONE = 0,
+  RESUME_SESSIONID = 1,
+  RESUME_TICKET = 2,
+  RESUME_BOTH = RESUME_SESSIONID | RESUME_TICKET
+};
+
+class TlsAgent;
+
+const extern std::vector<SSLNamedGroup> kAllDHEGroups;
+const extern std::vector<SSLNamedGroup> kECDHEGroups;
+const extern std::vector<SSLNamedGroup> kFFDHEGroups;
+const extern std::vector<SSLNamedGroup> kFasterDHEGroups;
+
+typedef std::function<SECStatus(TlsAgent* agent, bool checksig, bool isServer)>
+    AuthCertificateCallbackFunction;
+
+typedef std::function<void(TlsAgent* agent)> HandshakeCallbackFunction;
+
+typedef std::function<int32_t(TlsAgent* agent, const SECItem* srvNameArr,
+                              PRUint32 srvNameArrSize)>
+    SniCallbackFunction;
+
+class TlsAgent : public PollTarget {
+ public:
+  enum Role { CLIENT, SERVER };
+  enum State { STATE_INIT, STATE_CONNECTING, STATE_CONNECTED, STATE_ERROR };
+
+  static const std::string kClient;     // the client key is sign only
+  static const std::string kRsa2048;    // bigger sign and encrypt for either
+  static const std::string kServerRsa;  // both sign and encrypt
+  static const std::string kServerRsaSign;
+  static const std::string kServerRsaPss;
+  static const std::string kServerRsaDecrypt;
+  static const std::string kServerRsaChain;  // A cert that requires a chain.
+  static const std::string kServerEcdsa256;
+  static const std::string kServerEcdsa384;
+  static const std::string kServerEcdsa521;
+  static const std::string kServerEcdhEcdsa;
+  static const std::string kServerEcdhRsa;
+  static const std::string kServerDsa;
+
+  TlsAgent(const std::string& name, Role role, Mode mode);
+  virtual ~TlsAgent();
+
+  bool Init() {
+    pr_fd_ = DummyPrSocket::CreateFD(role_str(), mode_);
+    if (!pr_fd_) return false;
+
+    adapter_ = DummyPrSocket::GetAdapter(pr_fd_);
+    if (!adapter_) return false;
+
+    return true;
+  }
+
+  void SetPeer(TlsAgent* peer) { adapter_->SetPeer(peer->adapter_); }
+
+  void SetPacketFilter(PacketFilter* filter) {
+    adapter_->SetPacketFilter(filter);
+  }
+
+  void StartConnect(PRFileDesc* model = nullptr);
+  void CheckKEA(SSLKEAType kea_type, SSLNamedGroup group,
+                size_t kea_size = 0) const;
+  void CheckAuthType(SSLAuthType auth_type,
+                     SSLSignatureScheme sig_scheme) const;
+
+  void DisableAllCiphers();
+  void EnableCiphersByAuthType(SSLAuthType authType);
+  void EnableCiphersByKeyExchange(SSLKEAType kea);
+  void EnableGroupsByKeyExchange(SSLKEAType kea);
+  void EnableGroupsByAuthType(SSLAuthType authType);
+  void EnableSingleCipher(uint16_t cipher);
+
+  void Handshake();
+  // Marks the internal state as CONNECTING in anticipation of renegotiation.
+  void PrepareForRenegotiate();
+  // Prepares for renegotiation, then actually triggers it.
+  void StartRenegotiate();
+  bool ConfigServerCert(const std::string& name, bool updateKeyBits = false,
+                        const SSLExtraServerCertData* serverCertData = nullptr);
+  bool ConfigServerCertWithChain(const std::string& name);
+  bool EnsureTlsSetup(PRFileDesc* modelSocket = nullptr);
+
+  void SetupClientAuth();
+  void RequestClientAuth(bool requireAuth);
+  bool GetClientAuthCredentials(CERTCertificate** cert,
+                                SECKEYPrivateKey** priv) const;
+
+  void ConfigureSessionCache(SessionResumptionMode mode);
+  void SetSessionTicketsEnabled(bool en);
+  void SetSessionCacheEnabled(bool en);
+  void Set0RttEnabled(bool en);
+  void SetShortHeadersEnabled();
+  void SetVersionRange(uint16_t minver, uint16_t maxver);
+  void GetVersionRange(uint16_t* minver, uint16_t* maxver);
+  void CheckPreliminaryInfo();
+  void ResetPreliminaryInfo();
+  void SetExpectedVersion(uint16_t version);
+  void SetServerKeyBits(uint16_t bits);
+  void ExpectReadWriteError();
+  void EnableFalseStart();
+  void ExpectResumption();
+  void ExpectShortHeaders();
+  void SetSignatureSchemes(const SSLSignatureScheme* schemes, size_t count);
+  void EnableAlpn(const uint8_t* val, size_t len);
+  void CheckAlpn(SSLNextProtoState expected_state,
+                 const std::string& expected = "") const;
+  void EnableSrtp();
+  void CheckSrtp() const;
+  void CheckErrorCode(int32_t expected) const;
+  void WaitForErrorCode(int32_t expected, uint32_t delay) const;
+  // Send data on the socket, encrypting it.
+  void SendData(size_t bytes, size_t blocksize = 1024);
+  void SendBuffer(const DataBuffer& buf);
+  // Send data directly to the underlying socket, skipping the TLS layer.
+  void SendDirect(const DataBuffer& buf);
+  void ReadBytes();
+  void ResetSentBytes();  // Hack to test drops.
+  void EnableExtendedMasterSecret();
+  void CheckExtendedMasterSecret(bool expected);
+  void CheckEarlyDataAccepted(bool expected);
+  void DisableRollbackDetection();
+  void EnableCompression();
+  void SetDowngradeCheckVersion(uint16_t version);
+  void CheckSecretsDestroyed();
+  void ConfigNamedGroups(const std::vector<SSLNamedGroup>& groups);
+  void DisableECDHEServerKeyReuse();
+  bool GetPeerChainLength(size_t* count);
+
+  const std::string& name() const { return name_; }
+
+  Role role() const { return role_; }
+  std::string role_str() const { return role_ == SERVER ? "server" : "client"; }
+
+  State state() const { return state_; }
+
+  const CERTCertificate* peer_cert() const {
+    return SSL_PeerCertificate(ssl_fd_);
+  }
+
+  const char* state_str() const { return state_str(state()); }
+
+  static const char* state_str(State state) { return states[state]; }
+
+  PRFileDesc* ssl_fd() { return ssl_fd_; }
+  DummyPrSocket* adapter() { return adapter_; }
+
+  bool is_compressed() const {
+    return info_.compressionMethod != ssl_compression_null;
+  }
+  uint16_t server_key_bits() const { return server_key_bits_; }
+  uint16_t min_version() const { return vrange_.min; }
+  uint16_t max_version() const { return vrange_.max; }
+  uint16_t version() const {
+    EXPECT_EQ(STATE_CONNECTED, state_);
+    return info_.protocolVersion;
+  }
+
+  bool cipher_suite(uint16_t* cipher_suite) const {
+    if (state_ != STATE_CONNECTED) return false;
+
+    *cipher_suite = info_.cipherSuite;
+    return true;
+  }
+
+  std::string cipher_suite_name() const {
+    if (state_ != STATE_CONNECTED) return "UNKNOWN";
+
+    return csinfo_.cipherSuiteName;
+  }
+
+  std::vector<uint8_t> session_id() const {
+    return std::vector<uint8_t>(info_.sessionID,
+                                info_.sessionID + info_.sessionIDLength);
+  }
+
+  bool auth_type(SSLAuthType* auth_type) const {
+    if (state_ != STATE_CONNECTED) return false;
+
+    *auth_type = info_.authType;
+    return true;
+  }
+
+  bool kea_type(SSLKEAType* kea_type) const {
+    if (state_ != STATE_CONNECTED) return false;
+
+    *kea_type = info_.keaType;
+    return true;
+  }
+
+  size_t received_bytes() const { return recv_ctr_; }
+  PRErrorCode error_code() const { return error_code_; }
+
+  bool can_falsestart_hook_called() const {
+    return can_falsestart_hook_called_;
+  }
+
+  void SetHandshakeCallback(HandshakeCallbackFunction handshake_callback) {
+    handshake_callback_ = handshake_callback;
+  }
+
+  void SetAuthCertificateCallback(
+      AuthCertificateCallbackFunction auth_certificate_callback) {
+    auth_certificate_callback_ = auth_certificate_callback;
+  }
+
+  void SetSniCallback(SniCallbackFunction sni_callback) {
+    sni_callback_ = sni_callback;
+  }
+
+ private:
+  const static char* states[];
+
+  void SetState(State state);
+
+  // Dummy auth certificate hook.
+  static SECStatus AuthCertificateHook(void* arg, PRFileDesc* fd,
+                                       PRBool checksig, PRBool isServer) {
+    TlsAgent* agent = reinterpret_cast<TlsAgent*>(arg);
+    agent->CheckPreliminaryInfo();
+    agent->auth_certificate_hook_called_ = true;
+    if (agent->auth_certificate_callback_) {
+      return agent->auth_certificate_callback_(agent, checksig ? true : false,
+                                               isServer ? true : false);
+    }
+    return SECSuccess;
+  }
+
+  // Client auth certificate hook.
+  static SECStatus ClientAuthenticated(void* arg, PRFileDesc* fd,
+                                       PRBool checksig, PRBool isServer) {
+    TlsAgent* agent = reinterpret_cast<TlsAgent*>(arg);
+    EXPECT_TRUE(agent->expect_client_auth_);
+    EXPECT_EQ(PR_TRUE, isServer);
+    if (agent->auth_certificate_callback_) {
+      return agent->auth_certificate_callback_(agent, checksig ? true : false,
+                                               isServer ? true : false);
+    }
+    return SECSuccess;
+  }
+
+  static SECStatus GetClientAuthDataHook(void* self, PRFileDesc* fd,
+                                         CERTDistNames* caNames,
+                                         CERTCertificate** cert,
+                                         SECKEYPrivateKey** privKey);
+
+  static void ReadableCallback(PollTarget* self, Event event) {
+    TlsAgent* agent = static_cast<TlsAgent*>(self);
+    if (event == TIMER_EVENT) {
+      agent->timer_handle_ = nullptr;
+    }
+    agent->ReadableCallback_int();
+  }
+
+  void ReadableCallback_int() {
+    LOGV("Readable");
+    switch (state_) {
+      case STATE_CONNECTING:
+        Handshake();
+        break;
+      case STATE_CONNECTED:
+        ReadBytes();
+        break;
+      default:
+        break;
+    }
+  }
+
+  static PRInt32 SniHook(PRFileDesc* fd, const SECItem* srvNameArr,
+                         PRUint32 srvNameArrSize, void* arg) {
+    TlsAgent* agent = reinterpret_cast<TlsAgent*>(arg);
+    agent->CheckPreliminaryInfo();
+    agent->sni_hook_called_ = true;
+    EXPECT_EQ(1UL, srvNameArrSize);
+    if (agent->sni_callback_) {
+      return agent->sni_callback_(agent, srvNameArr, srvNameArrSize);
+    }
+    return 0;  // First configuration.
+  }
+
+  static SECStatus CanFalseStartCallback(PRFileDesc* fd, void* arg,
+                                         PRBool* canFalseStart) {
+    TlsAgent* agent = reinterpret_cast<TlsAgent*>(arg);
+    agent->CheckPreliminaryInfo();
+    EXPECT_TRUE(agent->falsestart_enabled_);
+    EXPECT_FALSE(agent->can_falsestart_hook_called_);
+    agent->can_falsestart_hook_called_ = true;
+    *canFalseStart = true;
+    return SECSuccess;
+  }
+
+  static void HandshakeCallback(PRFileDesc* fd, void* arg) {
+    TlsAgent* agent = reinterpret_cast<TlsAgent*>(arg);
+    agent->handshake_callback_called_ = true;
+    agent->Connected();
+    if (agent->handshake_callback_) {
+      agent->handshake_callback_(agent);
+    }
+  }
+
+  void DisableLameGroups();
+  void ConfigStrongECGroups(bool en);
+  void ConfigAllDHGroups(bool en);
+  void CheckCallbacks() const;
+  void Connected();
+
+  const std::string name_;
+  Mode mode_;
+  uint16_t server_key_bits_;
+  PRFileDesc* pr_fd_;
+  DummyPrSocket* adapter_;
+  PRFileDesc* ssl_fd_;
+  Role role_;
+  State state_;
+  Poller::Timer* timer_handle_;
+  bool falsestart_enabled_;
+  uint16_t expected_version_;
+  uint16_t expected_cipher_suite_;
+  bool expect_resumption_;
+  bool expect_client_auth_;
+  bool can_falsestart_hook_called_;
+  bool sni_hook_called_;
+  bool auth_certificate_hook_called_;
+  bool handshake_callback_called_;
+  SSLChannelInfo info_;
+  SSLCipherSuiteInfo csinfo_;
+  SSLVersionRange vrange_;
+  PRErrorCode error_code_;
+  size_t send_ctr_;
+  size_t recv_ctr_;
+  bool expect_readwrite_error_;
+  HandshakeCallbackFunction handshake_callback_;
+  AuthCertificateCallbackFunction auth_certificate_callback_;
+  SniCallbackFunction sni_callback_;
+  bool expect_short_headers_;
+};
+
+inline std::ostream& operator<<(std::ostream& stream,
+                                const TlsAgent::State& state) {
+  return stream << TlsAgent::state_str(state);
+}
+
+class TlsAgentTestBase : public ::testing::Test {
+ public:
+  static ::testing::internal::ParamGenerator<std::string> kTlsRolesAll;
+
+  TlsAgentTestBase(TlsAgent::Role role, Mode mode)
+      : agent_(nullptr), fd_(nullptr), role_(role), mode_(mode) {}
+  ~TlsAgentTestBase() {
+    if (fd_) {
+      PR_Close(fd_);
+    }
+  }
+
+  void SetUp();
+  void TearDown();
+
+  static void MakeRecord(Mode mode, uint8_t type, uint16_t version,
+                         const uint8_t* buf, size_t len, DataBuffer* out,
+                         uint64_t seq_num = 0);
+  void MakeRecord(uint8_t type, uint16_t version, const uint8_t* buf,
+                  size_t len, DataBuffer* out, uint64_t seq_num = 0) const;
+  void MakeHandshakeMessage(uint8_t hs_type, const uint8_t* data, size_t hs_len,
+                            DataBuffer* out, uint64_t seq_num = 0) const;
+  void MakeHandshakeMessageFragment(uint8_t hs_type, const uint8_t* data,
+                                    size_t hs_len, DataBuffer* out,
+                                    uint64_t seq_num, uint32_t fragment_offset,
+                                    uint32_t fragment_length) const;
+  static void MakeTrivialHandshakeRecord(uint8_t hs_type, size_t hs_len,
+                                         DataBuffer* out);
+  static inline TlsAgent::Role ToRole(const std::string& str) {
+    return str == "CLIENT" ? TlsAgent::CLIENT : TlsAgent::SERVER;
+  }
+
+  static inline Mode ToMode(const std::string& str) {
+    return str == "TLS" ? STREAM : DGRAM;
+  }
+
+  void Init(const std::string& server_name = TlsAgent::kServerRsa);
+  void Reset(const std::string& server_name = TlsAgent::kServerRsa);
+
+ protected:
+  void EnsureInit();
+  void ProcessMessage(const DataBuffer& buffer, TlsAgent::State expected_state,
+                      int32_t error_code = 0);
+
+  TlsAgent* agent_;
+  PRFileDesc* fd_;
+  TlsAgent::Role role_;
+  Mode mode_;
+};
+
+class TlsAgentTest : public TlsAgentTestBase,
+                     public ::testing::WithParamInterface<
+                         std::tuple<std::string, std::string>> {
+ public:
+  TlsAgentTest()
+      : TlsAgentTestBase(ToRole(std::get<0>(GetParam())),
+                         ToMode(std::get<1>(GetParam()))) {}
+};
+
+class TlsAgentTestClient : public TlsAgentTestBase,
+                           public ::testing::WithParamInterface<std::string> {
+ public:
+  TlsAgentTestClient()
+      : TlsAgentTestBase(TlsAgent::CLIENT, ToMode(GetParam())) {}
+};
+
+class TlsAgentStreamTestClient : public TlsAgentTestBase {
+ public:
+  TlsAgentStreamTestClient() : TlsAgentTestBase(TlsAgent::CLIENT, STREAM) {}
+};
+
+class TlsAgentStreamTestServer : public TlsAgentTestBase {
+ public:
+  TlsAgentStreamTestServer() : TlsAgentTestBase(TlsAgent::SERVER, STREAM) {}
+};
+
+class TlsAgentDgramTestClient : public TlsAgentTestBase {
+ public:
+  TlsAgentDgramTestClient() : TlsAgentTestBase(TlsAgent::CLIENT, DGRAM) {}
+};
+
+}  // namespace nss_test
+
+#endif
diff --git a/security/nss/gtests/ssl_gtest/tls_connect.cc b/security/nss/gtests/ssl_gtest/tls_connect.cc
new file mode 100644
index 0000000000..d02549954d
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_connect.cc
@@ -0,0 +1,708 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "tls_connect.h"
+extern "C" {
+#include "libssl_internals.h"
+}
+
+#include <iostream>
+
+#include "databuffer.h"
+#include "gtest_utils.h"
+#include "sslproto.h"
+
+extern std::string g_working_dir_path;
+
+namespace nss_test {
+
+static const std::string kTlsModesStreamArr[] = {"TLS"};
+::testing::internal::ParamGenerator<std::string>
+    TlsConnectTestBase::kTlsModesStream =
+        ::testing::ValuesIn(kTlsModesStreamArr);
+static const std::string kTlsModesDatagramArr[] = {"DTLS"};
+::testing::internal::ParamGenerator<std::string>
+    TlsConnectTestBase::kTlsModesDatagram =
+        ::testing::ValuesIn(kTlsModesDatagramArr);
+static const std::string kTlsModesAllArr[] = {"TLS", "DTLS"};
+::testing::internal::ParamGenerator<std::string>
+    TlsConnectTestBase::kTlsModesAll = ::testing::ValuesIn(kTlsModesAllArr);
+
+static const uint16_t kTlsV10Arr[] = {SSL_LIBRARY_VERSION_TLS_1_0};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV10 =
+    ::testing::ValuesIn(kTlsV10Arr);
+static const uint16_t kTlsV11Arr[] = {SSL_LIBRARY_VERSION_TLS_1_1};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV11 =
+    ::testing::ValuesIn(kTlsV11Arr);
+static const uint16_t kTlsV12Arr[] = {SSL_LIBRARY_VERSION_TLS_1_2};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV12 =
+    ::testing::ValuesIn(kTlsV12Arr);
+static const uint16_t kTlsV10V11Arr[] = {SSL_LIBRARY_VERSION_TLS_1_0,
+                                         SSL_LIBRARY_VERSION_TLS_1_1};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV10V11 =
+    ::testing::ValuesIn(kTlsV10V11Arr);
+static const uint16_t kTlsV10ToV12Arr[] = {SSL_LIBRARY_VERSION_TLS_1_0,
+                                           SSL_LIBRARY_VERSION_TLS_1_1,
+                                           SSL_LIBRARY_VERSION_TLS_1_2};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV10ToV12 =
+    ::testing::ValuesIn(kTlsV10ToV12Arr);
+static const uint16_t kTlsV11V12Arr[] = {SSL_LIBRARY_VERSION_TLS_1_1,
+                                         SSL_LIBRARY_VERSION_TLS_1_2};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV11V12 =
+    ::testing::ValuesIn(kTlsV11V12Arr);
+
+static const uint16_t kTlsV11PlusArr[] = {
+#ifndef NSS_DISABLE_TLS_1_3
+    SSL_LIBRARY_VERSION_TLS_1_3,
+#endif
+    SSL_LIBRARY_VERSION_TLS_1_2, SSL_LIBRARY_VERSION_TLS_1_1};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV11Plus =
+    ::testing::ValuesIn(kTlsV11PlusArr);
+static const uint16_t kTlsV12PlusArr[] = {
+#ifndef NSS_DISABLE_TLS_1_3
+    SSL_LIBRARY_VERSION_TLS_1_3,
+#endif
+    SSL_LIBRARY_VERSION_TLS_1_2};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV12Plus =
+    ::testing::ValuesIn(kTlsV12PlusArr);
+static const uint16_t kTlsV13Arr[] = {SSL_LIBRARY_VERSION_TLS_1_3};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsV13 =
+    ::testing::ValuesIn(kTlsV13Arr);
+static const uint16_t kTlsVAllArr[] = {
+#ifndef NSS_DISABLE_TLS_1_3
+    SSL_LIBRARY_VERSION_TLS_1_3,
+#endif
+    SSL_LIBRARY_VERSION_TLS_1_2, SSL_LIBRARY_VERSION_TLS_1_1,
+    SSL_LIBRARY_VERSION_TLS_1_0};
+::testing::internal::ParamGenerator<uint16_t> TlsConnectTestBase::kTlsVAll =
+    ::testing::ValuesIn(kTlsVAllArr);
+
+std::string VersionString(uint16_t version) {
+  switch (version) {
+    case 0:
+      return "(no version)";
+    case SSL_LIBRARY_VERSION_TLS_1_0:
+      return "1.0";
+    case SSL_LIBRARY_VERSION_TLS_1_1:
+      return "1.1";
+    case SSL_LIBRARY_VERSION_TLS_1_2:
+      return "1.2";
+    case SSL_LIBRARY_VERSION_TLS_1_3:
+      return "1.3";
+    default:
+      std::cerr << "Invalid version: " << version << std::endl;
+      EXPECT_TRUE(false);
+      return "";
+  }
+}
+
+TlsConnectTestBase::TlsConnectTestBase(Mode mode, uint16_t version)
+    : mode_(mode),
+      client_(new TlsAgent(TlsAgent::kClient, TlsAgent::CLIENT, mode_)),
+      server_(new TlsAgent(TlsAgent::kServerRsa, TlsAgent::SERVER, mode_)),
+      client_model_(nullptr),
+      server_model_(nullptr),
+      version_(version),
+      expected_resumption_mode_(RESUME_NONE),
+      session_ids_(),
+      expect_extended_master_secret_(false),
+      expect_early_data_accepted_(false) {
+  std::string v;
+  if (mode_ == DGRAM && version_ == SSL_LIBRARY_VERSION_TLS_1_1) {
+    v = "1.0";
+  } else {
+    v = VersionString(version_);
+  }
+  std::cerr << "Version: " << mode_ << " " << v << std::endl;
+}
+
+TlsConnectTestBase::TlsConnectTestBase(const std::string& mode,
+                                       uint16_t version)
+    : TlsConnectTestBase(TlsConnectTestBase::ToMode(mode), version) {}
+
+TlsConnectTestBase::~TlsConnectTestBase() {}
+
+// Check the group of each of the supported groups
+void TlsConnectTestBase::CheckGroups(
+    const DataBuffer& groups, std::function<void(SSLNamedGroup)> check_group) {
+  DuplicateGroupChecker group_set;
+  uint32_t tmp = 0;
+  EXPECT_TRUE(groups.Read(0, 2, &tmp));
+  EXPECT_EQ(groups.len() - 2, static_cast<size_t>(tmp));
+  for (size_t i = 2; i < groups.len(); i += 2) {
+    EXPECT_TRUE(groups.Read(i, 2, &tmp));
+    SSLNamedGroup group = static_cast<SSLNamedGroup>(tmp);
+    group_set.AddAndCheckGroup(group);
+    check_group(group);
+  }
+}
+
+// Check the group of each of the shares
+void TlsConnectTestBase::CheckShares(
+    const DataBuffer& shares, std::function<void(SSLNamedGroup)> check_group) {
+  DuplicateGroupChecker group_set;
+  uint32_t tmp = 0;
+  EXPECT_TRUE(shares.Read(0, 2, &tmp));
+  EXPECT_EQ(shares.len() - 2, static_cast<size_t>(tmp));
+  size_t i;
+  for (i = 2; i < shares.len(); i += 4 + tmp) {
+    ASSERT_TRUE(shares.Read(i, 2, &tmp));
+    SSLNamedGroup group = static_cast<SSLNamedGroup>(tmp);
+    group_set.AddAndCheckGroup(group);
+    check_group(group);
+    ASSERT_TRUE(shares.Read(i + 2, 2, &tmp));
+  }
+  EXPECT_EQ(shares.len(), i);
+}
+
+void TlsConnectTestBase::ClearStats() {
+  // Clear statistics.
+  SSL3Statistics* stats = SSL_GetStatistics();
+  memset(stats, 0, sizeof(*stats));
+}
+
+void TlsConnectTestBase::ClearServerCache() {
+  SSL_ShutdownServerSessionIDCache();
+  SSLInt_ClearSessionTicketKey();
+  SSL_ConfigServerSessionIDCache(1024, 0, 0, g_working_dir_path.c_str());
+}
+
+void TlsConnectTestBase::SetUp() {
+  SSL_ConfigServerSessionIDCache(1024, 0, 0, g_working_dir_path.c_str());
+  SSLInt_ClearSessionTicketKey();
+  ClearStats();
+  Init();
+}
+
+void TlsConnectTestBase::TearDown() {
+  delete client_;
+  delete server_;
+  if (client_model_) {
+    ASSERT_NE(server_model_, nullptr);
+    delete client_model_;
+    delete server_model_;
+  }
+
+  SSL_ClearSessionCache();
+  SSLInt_ClearSessionTicketKey();
+  SSL_ShutdownServerSessionIDCache();
+}
+
+void TlsConnectTestBase::Init() {
+  EXPECT_TRUE(client_->Init());
+  EXPECT_TRUE(server_->Init());
+
+  client_->SetPeer(server_);
+  server_->SetPeer(client_);
+
+  if (version_) {
+    ConfigureVersion(version_);
+  }
+}
+
+void TlsConnectTestBase::Reset() {
+  // Take a copy of the names because they are about to disappear.
+  std::string server_name = server_->name();
+  std::string client_name = client_->name();
+  Reset(server_name, client_name);
+}
+
+void TlsConnectTestBase::Reset(const std::string& server_name,
+                               const std::string& client_name) {
+  delete client_;
+  delete server_;
+
+  client_ = new TlsAgent(client_name, TlsAgent::CLIENT, mode_);
+  server_ = new TlsAgent(server_name, TlsAgent::SERVER, mode_);
+
+  Init();
+}
+
+void TlsConnectTestBase::ExpectResumption(SessionResumptionMode expected) {
+  expected_resumption_mode_ = expected;
+  if (expected != RESUME_NONE) {
+    client_->ExpectResumption();
+    server_->ExpectResumption();
+  }
+}
+
+void TlsConnectTestBase::EnsureTlsSetup() {
+  EXPECT_TRUE(server_->EnsureTlsSetup(server_model_ ? server_model_->ssl_fd()
+                                                    : nullptr));
+  EXPECT_TRUE(client_->EnsureTlsSetup(client_model_ ? client_model_->ssl_fd()
+                                                    : nullptr));
+}
+
+void TlsConnectTestBase::Handshake() {
+  EnsureTlsSetup();
+  client_->SetServerKeyBits(server_->server_key_bits());
+  client_->Handshake();
+  server_->Handshake();
+
+  ASSERT_TRUE_WAIT((client_->state() != TlsAgent::STATE_CONNECTING) &&
+                       (server_->state() != TlsAgent::STATE_CONNECTING),
+                   5000);
+}
+
+void TlsConnectTestBase::EnableExtendedMasterSecret() {
+  client_->EnableExtendedMasterSecret();
+  server_->EnableExtendedMasterSecret();
+  ExpectExtendedMasterSecret(true);
+}
+
+void TlsConnectTestBase::Connect() {
+  server_->StartConnect(server_model_ ? server_model_->ssl_fd() : nullptr);
+  client_->StartConnect(client_model_ ? client_model_->ssl_fd() : nullptr);
+  Handshake();
+  CheckConnected();
+}
+
+void TlsConnectTestBase::ConnectWithCipherSuite(uint16_t cipher_suite) {
+  EnsureTlsSetup();
+  client_->EnableSingleCipher(cipher_suite);
+
+  Connect();
+  SendReceive();
+
+  // Check that we used the right cipher suite.
+  uint16_t actual;
+  EXPECT_TRUE(client_->cipher_suite(&actual));
+  EXPECT_EQ(cipher_suite, actual);
+  EXPECT_TRUE(server_->cipher_suite(&actual));
+  EXPECT_EQ(cipher_suite, actual);
+}
+
+void TlsConnectTestBase::CheckConnected() {
+  // Check the version is as expected
+  EXPECT_EQ(client_->version(), server_->version());
+  EXPECT_EQ(std::min(client_->max_version(), server_->max_version()),
+            client_->version());
+
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, client_->state());
+  EXPECT_EQ(TlsAgent::STATE_CONNECTED, server_->state());
+
+  uint16_t cipher_suite1, cipher_suite2;
+  bool ret = client_->cipher_suite(&cipher_suite1);
+  EXPECT_TRUE(ret);
+  ret = server_->cipher_suite(&cipher_suite2);
+  EXPECT_TRUE(ret);
+  EXPECT_EQ(cipher_suite1, cipher_suite2);
+
+  std::cerr << "Connected with version " << client_->version()
+            << " cipher suite " << client_->cipher_suite_name() << std::endl;
+
+  if (client_->version() < SSL_LIBRARY_VERSION_TLS_1_3) {
+    // Check and store session ids.
+    std::vector<uint8_t> sid_c1 = client_->session_id();
+    EXPECT_EQ(32U, sid_c1.size());
+    std::vector<uint8_t> sid_s1 = server_->session_id();
+    EXPECT_EQ(32U, sid_s1.size());
+    EXPECT_EQ(sid_c1, sid_s1);
+    session_ids_.push_back(sid_c1);
+  }
+
+  CheckExtendedMasterSecret();
+  CheckEarlyDataAccepted();
+  CheckResumption(expected_resumption_mode_);
+  client_->CheckSecretsDestroyed();
+  server_->CheckSecretsDestroyed();
+}
+
+void TlsConnectTestBase::CheckKeys(SSLKEAType kea_type, SSLNamedGroup kea_group,
+                                   SSLAuthType auth_type,
+                                   SSLSignatureScheme sig_scheme) const {
+  client_->CheckKEA(kea_type, kea_group);
+  server_->CheckKEA(kea_type, kea_group);
+  client_->CheckAuthType(auth_type, sig_scheme);
+  server_->CheckAuthType(auth_type, sig_scheme);
+}
+
+void TlsConnectTestBase::CheckKeys(SSLKEAType kea_type,
+                                   SSLAuthType auth_type) const {
+  SSLNamedGroup group;
+  switch (kea_type) {
+    case ssl_kea_ecdh:
+      group = ssl_grp_ec_curve25519;
+      break;
+    case ssl_kea_dh:
+      group = ssl_grp_ffdhe_2048;
+      break;
+    case ssl_kea_rsa:
+      group = ssl_grp_none;
+      break;
+    default:
+      EXPECT_TRUE(false) << "unexpected KEA";
+      group = ssl_grp_none;
+      break;
+  }
+
+  SSLSignatureScheme scheme;
+  switch (auth_type) {
+    case ssl_auth_rsa_decrypt:
+      scheme = ssl_sig_none;
+      break;
+    case ssl_auth_rsa_sign:
+      scheme = ssl_sig_rsa_pss_sha256;
+      break;
+    case ssl_auth_ecdsa:
+      scheme = ssl_sig_ecdsa_secp256r1_sha256;
+      break;
+    case ssl_auth_dsa:
+      scheme = ssl_sig_dsa_sha1;
+      break;
+    default:
+      EXPECT_TRUE(false) << "unexpected auth type";
+      scheme = static_cast<SSLSignatureScheme>(0x0100);
+      break;
+  }
+  CheckKeys(kea_type, group, auth_type, scheme);
+}
+
+void TlsConnectTestBase::CheckKeys() const {
+  CheckKeys(ssl_kea_ecdh, ssl_auth_rsa_sign);
+}
+
+void TlsConnectTestBase::ConnectExpectFail() {
+  server_->StartConnect();
+  client_->StartConnect();
+  Handshake();
+  ASSERT_EQ(TlsAgent::STATE_ERROR, client_->state());
+  ASSERT_EQ(TlsAgent::STATE_ERROR, server_->state());
+}
+
+void TlsConnectTestBase::ConfigureVersion(uint16_t version) {
+  client_->SetVersionRange(version, version);
+  server_->SetVersionRange(version, version);
+}
+
+void TlsConnectTestBase::SetExpectedVersion(uint16_t version) {
+  client_->SetExpectedVersion(version);
+  server_->SetExpectedVersion(version);
+}
+
+void TlsConnectTestBase::DisableAllCiphers() {
+  EnsureTlsSetup();
+  client_->DisableAllCiphers();
+  server_->DisableAllCiphers();
+}
+
+void TlsConnectTestBase::EnableOnlyStaticRsaCiphers() {
+  DisableAllCiphers();
+
+  client_->EnableCiphersByKeyExchange(ssl_kea_rsa);
+  server_->EnableCiphersByKeyExchange(ssl_kea_rsa);
+}
+
+void TlsConnectTestBase::EnableOnlyDheCiphers() {
+  if (version_ < SSL_LIBRARY_VERSION_TLS_1_3) {
+    DisableAllCiphers();
+    client_->EnableCiphersByKeyExchange(ssl_kea_dh);
+    server_->EnableCiphersByKeyExchange(ssl_kea_dh);
+  } else {
+    client_->ConfigNamedGroups(kFFDHEGroups);
+    server_->ConfigNamedGroups(kFFDHEGroups);
+  }
+}
+
+void TlsConnectTestBase::EnableSomeEcdhCiphers() {
+  if (version_ < SSL_LIBRARY_VERSION_TLS_1_3) {
+    client_->EnableCiphersByAuthType(ssl_auth_ecdh_rsa);
+    client_->EnableCiphersByAuthType(ssl_auth_ecdh_ecdsa);
+    server_->EnableCiphersByAuthType(ssl_auth_ecdh_rsa);
+    server_->EnableCiphersByAuthType(ssl_auth_ecdh_ecdsa);
+  } else {
+    client_->ConfigNamedGroups(kECDHEGroups);
+    server_->ConfigNamedGroups(kECDHEGroups);
+  }
+}
+
+void TlsConnectTestBase::ConfigureSessionCache(SessionResumptionMode client,
+                                               SessionResumptionMode server) {
+  client_->ConfigureSessionCache(client);
+  server_->ConfigureSessionCache(server);
+  if ((server & RESUME_TICKET) != 0) {
+    // This is an abomination.  NSS encrypts session tickets with the server's
+    // RSA public key.  That means we need the server to have an RSA certificate
+    // even if it won't be used for the connection.
+    server_->ConfigServerCert(TlsAgent::kServerRsaDecrypt);
+  }
+}
+
+void TlsConnectTestBase::CheckResumption(SessionResumptionMode expected) {
+  EXPECT_NE(RESUME_BOTH, expected);
+
+  int resume_count = expected ? 1 : 0;
+  int stateless_count = (expected & RESUME_TICKET) ? 1 : 0;
+
+  // Note: hch == server counter; hsh == client counter.
+  SSL3Statistics* stats = SSL_GetStatistics();
+  EXPECT_EQ(resume_count, stats->hch_sid_cache_hits);
+  EXPECT_EQ(resume_count, stats->hsh_sid_cache_hits);
+
+  EXPECT_EQ(stateless_count, stats->hch_sid_stateless_resumes);
+  EXPECT_EQ(stateless_count, stats->hsh_sid_stateless_resumes);
+
+  if (expected != RESUME_NONE) {
+    if (client_->version() < SSL_LIBRARY_VERSION_TLS_1_3) {
+      // Check that the last two session ids match.
+      ASSERT_EQ(2U, session_ids_.size());
+      EXPECT_EQ(session_ids_[session_ids_.size() - 1],
+                session_ids_[session_ids_.size() - 2]);
+    } else {
+      // TLS 1.3 only uses tickets.
+      EXPECT_TRUE(expected & RESUME_TICKET);
+    }
+  }
+}
+
+void TlsConnectTestBase::EnableAlpn() {
+  client_->EnableAlpn(alpn_dummy_val_, sizeof(alpn_dummy_val_));
+  server_->EnableAlpn(alpn_dummy_val_, sizeof(alpn_dummy_val_));
+}
+
+void TlsConnectTestBase::EnableAlpn(const uint8_t* val, size_t len) {
+  client_->EnableAlpn(val, len);
+  server_->EnableAlpn(val, len);
+}
+
+void TlsConnectTestBase::EnsureModelSockets() {
+  // Make sure models agents are available.
+  if (!client_model_) {
+    ASSERT_EQ(server_model_, nullptr);
+    client_model_ = new TlsAgent(TlsAgent::kClient, TlsAgent::CLIENT, mode_);
+    server_model_ = new TlsAgent(TlsAgent::kServerRsa, TlsAgent::SERVER, mode_);
+  }
+
+  // Initialise agents.
+  ASSERT_TRUE(client_model_->Init());
+  ASSERT_TRUE(server_model_->Init());
+}
+
+void TlsConnectTestBase::CheckAlpn(const std::string& val) {
+  client_->CheckAlpn(SSL_NEXT_PROTO_SELECTED, val);
+  server_->CheckAlpn(SSL_NEXT_PROTO_NEGOTIATED, val);
+}
+
+void TlsConnectTestBase::EnableSrtp() {
+  client_->EnableSrtp();
+  server_->EnableSrtp();
+}
+
+void TlsConnectTestBase::CheckSrtp() const {
+  client_->CheckSrtp();
+  server_->CheckSrtp();
+}
+
+void TlsConnectTestBase::SendReceive() {
+  client_->SendData(50);
+  server_->SendData(50);
+  Receive(50);
+}
+
+// Do a first connection so we can do 0-RTT on the second one.
+void TlsConnectTestBase::SetupForZeroRtt() {
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->Set0RttEnabled(true);  // So we signal that we allow 0-RTT.
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys();
+
+  Reset();
+  client_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->SetVersionRange(SSL_LIBRARY_VERSION_TLS_1_1,
+                           SSL_LIBRARY_VERSION_TLS_1_3);
+  server_->StartConnect();
+  client_->StartConnect();
+}
+
+// Do a first connection so we can do resumption
+void TlsConnectTestBase::SetupForResume() {
+  EnsureTlsSetup();
+  ConfigureSessionCache(RESUME_BOTH, RESUME_TICKET);
+  Connect();
+  SendReceive();  // Need to read so that we absorb the session ticket.
+  CheckKeys();
+
+  Reset();
+}
+
+void TlsConnectTestBase::ZeroRttSendReceive(
+    bool expect_writable, bool expect_readable,
+    std::function<bool()> post_clienthello_check) {
+  const char* k0RttData = "ABCDEF";
+  const PRInt32 k0RttDataLen = static_cast<PRInt32>(strlen(k0RttData));
+
+  client_->Handshake();  // Send ClientHello.
+  if (post_clienthello_check) {
+    if (!post_clienthello_check()) return;
+  }
+  PRInt32 rv =
+      PR_Write(client_->ssl_fd(), k0RttData, k0RttDataLen);  // 0-RTT write.
+  if (expect_writable) {
+    EXPECT_EQ(k0RttDataLen, rv);
+  } else {
+    EXPECT_EQ(SECFailure, rv);
+  }
+  server_->Handshake();  // Consume ClientHello, EE, Finished.
+
+  std::vector<uint8_t> buf(k0RttDataLen);
+  rv = PR_Read(server_->ssl_fd(), buf.data(), k0RttDataLen);  // 0-RTT read
+  if (expect_readable) {
+    std::cerr << "0-RTT read " << rv << " bytes\n";
+    EXPECT_EQ(k0RttDataLen, rv);
+  } else {
+    EXPECT_EQ(SECFailure, rv);
+    EXPECT_EQ(PR_WOULD_BLOCK_ERROR, PORT_GetError());
+  }
+
+  // Do a second read. this should fail.
+  rv = PR_Read(server_->ssl_fd(), buf.data(), k0RttDataLen);
+  EXPECT_EQ(SECFailure, rv);
+  EXPECT_EQ(PR_WOULD_BLOCK_ERROR, PORT_GetError());
+}
+
+void TlsConnectTestBase::Receive(size_t amount) {
+  WAIT_(client_->received_bytes() == amount &&
+            server_->received_bytes() == amount,
+        2000);
+  ASSERT_EQ(amount, client_->received_bytes());
+  ASSERT_EQ(amount, server_->received_bytes());
+}
+
+void TlsConnectTestBase::ExpectExtendedMasterSecret(bool expected) {
+  expect_extended_master_secret_ = expected;
+}
+
+void TlsConnectTestBase::CheckExtendedMasterSecret() {
+  client_->CheckExtendedMasterSecret(expect_extended_master_secret_);
+  server_->CheckExtendedMasterSecret(expect_extended_master_secret_);
+}
+
+void TlsConnectTestBase::ExpectEarlyDataAccepted(bool expected) {
+  expect_early_data_accepted_ = expected;
+}
+
+void TlsConnectTestBase::CheckEarlyDataAccepted() {
+  client_->CheckEarlyDataAccepted(expect_early_data_accepted_);
+  server_->CheckEarlyDataAccepted(expect_early_data_accepted_);
+}
+
+void TlsConnectTestBase::DisableECDHEServerKeyReuse() {
+  server_->DisableECDHEServerKeyReuse();
+}
+
+TlsConnectGeneric::TlsConnectGeneric()
+    : TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {}
+
+TlsConnectPre12::TlsConnectPre12()
+    : TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {}
+
+TlsConnectTls12::TlsConnectTls12()
+    : TlsConnectTestBase(GetParam(), SSL_LIBRARY_VERSION_TLS_1_2) {}
+
+TlsConnectTls12Plus::TlsConnectTls12Plus()
+    : TlsConnectTestBase(std::get<0>(GetParam()), std::get<1>(GetParam())) {}
+
+TlsConnectTls13::TlsConnectTls13()
+    : TlsConnectTestBase(GetParam(), SSL_LIBRARY_VERSION_TLS_1_3) {}
+
+void TlsKeyExchangeTest::EnsureKeyShareSetup() {
+  EnsureTlsSetup();
+  groups_capture_ = new TlsExtensionCapture(ssl_supported_groups_xtn);
+  shares_capture_ = new TlsExtensionCapture(ssl_tls13_key_share_xtn);
+  shares_capture2_ = new TlsExtensionCapture(ssl_tls13_key_share_xtn, true);
+  std::vector<PacketFilter*> captures;
+  captures.push_back(groups_capture_);
+  captures.push_back(shares_capture_);
+  captures.push_back(shares_capture2_);
+  client_->SetPacketFilter(new ChainedPacketFilter(captures));
+  capture_hrr_ =
+      new TlsInspectorRecordHandshakeMessage(kTlsHandshakeHelloRetryRequest);
+  server_->SetPacketFilter(capture_hrr_);
+}
+
+void TlsKeyExchangeTest::ConfigNamedGroups(
+    const std::vector<SSLNamedGroup>& groups) {
+  client_->ConfigNamedGroups(groups);
+  server_->ConfigNamedGroups(groups);
+}
+
+std::vector<SSLNamedGroup> TlsKeyExchangeTest::GetGroupDetails(
+    const DataBuffer& ext) {
+  uint32_t tmp = 0;
+  EXPECT_TRUE(ext.Read(0, 2, &tmp));
+  EXPECT_EQ(ext.len() - 2, static_cast<size_t>(tmp));
+  EXPECT_TRUE(ext.len() % 2 == 0);
+  std::vector<SSLNamedGroup> groups;
+  for (size_t i = 1; i < ext.len() / 2; i += 1) {
+    EXPECT_TRUE(ext.Read(2 * i, 2, &tmp));
+    groups.push_back(static_cast<SSLNamedGroup>(tmp));
+  }
+  return groups;
+}
+
+std::vector<SSLNamedGroup> TlsKeyExchangeTest::GetShareDetails(
+    const DataBuffer& ext) {
+  uint32_t tmp = 0;
+  EXPECT_TRUE(ext.Read(0, 2, &tmp));
+  EXPECT_EQ(ext.len() - 2, static_cast<size_t>(tmp));
+  std::vector<SSLNamedGroup> shares;
+  size_t i = 2;
+  while (i < ext.len()) {
+    EXPECT_TRUE(ext.Read(i, 2, &tmp));
+    shares.push_back(static_cast<SSLNamedGroup>(tmp));
+    EXPECT_TRUE(ext.Read(i + 2, 2, &tmp));
+    i += 4 + tmp;
+  }
+  EXPECT_EQ(ext.len(), i);
+  return shares;
+}
+
+void TlsKeyExchangeTest::CheckKEXDetails(
+    const std::vector<SSLNamedGroup>& expected_groups,
+    const std::vector<SSLNamedGroup>& expected_shares, bool expect_hrr) {
+  std::vector<SSLNamedGroup> groups =
+      GetGroupDetails(groups_capture_->extension());
+  EXPECT_EQ(expected_groups, groups);
+
+  if (version_ >= SSL_LIBRARY_VERSION_TLS_1_3) {
+    ASSERT_LT(0U, expected_shares.size());
+    std::vector<SSLNamedGroup> shares =
+        GetShareDetails(shares_capture_->extension());
+    EXPECT_EQ(expected_shares, shares);
+  } else {
+    EXPECT_EQ(0U, shares_capture_->extension().len());
+  }
+
+  EXPECT_EQ(expect_hrr, capture_hrr_->buffer().len() != 0);
+}
+
+void TlsKeyExchangeTest::CheckKEXDetails(
+    const std::vector<SSLNamedGroup>& expected_groups,
+    const std::vector<SSLNamedGroup>& expected_shares) {
+  CheckKEXDetails(expected_groups, expected_shares, false);
+}
+
+void TlsKeyExchangeTest::CheckKEXDetails(
+    const std::vector<SSLNamedGroup>& expected_groups,
+    const std::vector<SSLNamedGroup>& expected_shares,
+    SSLNamedGroup expected_share2) {
+  CheckKEXDetails(expected_groups, expected_shares, true);
+
+  for (auto it : expected_shares) {
+    EXPECT_NE(expected_share2, it);
+  }
+  std::vector<SSLNamedGroup> expected_shares2 = {expected_share2};
+  std::vector<SSLNamedGroup> shares =
+      GetShareDetails(shares_capture2_->extension());
+  EXPECT_EQ(expected_shares2, shares);
+}
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/tls_connect.h b/security/nss/gtests/ssl_gtest/tls_connect.h
new file mode 100644
index 0000000000..aa4a32d96e
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_connect.h
@@ -0,0 +1,274 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef tls_connect_h_
+#define tls_connect_h_
+
+#include <tuple>
+
+#include "sslproto.h"
+#include "sslt.h"
+
+#include "tls_agent.h"
+#include "tls_filter.h"
+
+#define GTEST_HAS_RTTI 0
+#include "gtest/gtest.h"
+
+namespace nss_test {
+
+extern std::string VersionString(uint16_t version);
+
+// A generic TLS connection test base.
+class TlsConnectTestBase : public ::testing::Test {
+ public:
+  static ::testing::internal::ParamGenerator<std::string> kTlsModesStream;
+  static ::testing::internal::ParamGenerator<std::string> kTlsModesDatagram;
+  static ::testing::internal::ParamGenerator<std::string> kTlsModesAll;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV10;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV11;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV12;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV10V11;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV11V12;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV10ToV12;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV13;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV11Plus;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsV12Plus;
+  static ::testing::internal::ParamGenerator<uint16_t> kTlsVAll;
+
+  TlsConnectTestBase(Mode mode, uint16_t version);
+  TlsConnectTestBase(const std::string& mode, uint16_t version);
+  virtual ~TlsConnectTestBase();
+
+  void SetUp();
+  void TearDown();
+
+  // Initialize client and server.
+  void Init();
+  // Clear the statistics.
+  void ClearStats();
+  // Clear the server session cache.
+  void ClearServerCache();
+  // Make sure TLS is configured for a connection.
+  void EnsureTlsSetup();
+  // Reset and keep the same certificate names
+  void Reset();
+  // Reset, and update the certificate names on both peers
+  void Reset(const std::string& server_name,
+             const std::string& client_name = "client");
+
+  // Run the handshake.
+  void Handshake();
+  // Connect and check that it works.
+  void Connect();
+  // Check that the connection was successfully established.
+  void CheckConnected();
+  // Connect and expect it to fail.
+  void ConnectExpectFail();
+  void ConnectWithCipherSuite(uint16_t cipher_suite);
+  // Check that the keys used in the handshake match expectations.
+  void CheckKeys(SSLKEAType kea_type, SSLNamedGroup kea_group,
+                 SSLAuthType auth_type, SSLSignatureScheme sig_scheme) const;
+  // This version guesses some of the values.
+  void CheckKeys(SSLKEAType kea_type, SSLAuthType auth_type) const;
+  // This version assumes defaults.
+  void CheckKeys() const;
+  void CheckGroups(const DataBuffer& groups,
+                   std::function<void(SSLNamedGroup)> check_group);
+  void CheckShares(const DataBuffer& shares,
+                   std::function<void(SSLNamedGroup)> check_group);
+
+  void ConfigureVersion(uint16_t version);
+  void SetExpectedVersion(uint16_t version);
+  // Expect resumption of a particular type.
+  void ExpectResumption(SessionResumptionMode expected);
+  void DisableAllCiphers();
+  void EnableOnlyStaticRsaCiphers();
+  void EnableOnlyDheCiphers();
+  void EnableSomeEcdhCiphers();
+  void EnableExtendedMasterSecret();
+  void ConfigureSessionCache(SessionResumptionMode client,
+                             SessionResumptionMode server);
+  void EnableAlpn();
+  void EnableAlpn(const uint8_t* val, size_t len);
+  void EnsureModelSockets();
+  void CheckAlpn(const std::string& val);
+  void EnableSrtp();
+  void CheckSrtp() const;
+  void SendReceive();
+  void SetupForZeroRtt();
+  void SetupForResume();
+  void ZeroRttSendReceive(
+      bool expect_writable, bool expect_readable,
+      std::function<bool()> post_clienthello_check = nullptr);
+  void Receive(size_t amount);
+  void ExpectExtendedMasterSecret(bool expected);
+  void ExpectEarlyDataAccepted(bool expected);
+  void DisableECDHEServerKeyReuse();
+
+ protected:
+  Mode mode_;
+  TlsAgent* client_;
+  TlsAgent* server_;
+  TlsAgent* client_model_;
+  TlsAgent* server_model_;
+  uint16_t version_;
+  SessionResumptionMode expected_resumption_mode_;
+  std::vector<std::vector<uint8_t>> session_ids_;
+
+  // A simple value of "a", "b".  Note that the preferred value of "a" is placed
+  // at the end, because the NSS API follows the now defunct NPN specification,
+  // which places the preferred (and default) entry at the end of the list.
+  // NSS will move this final entry to the front when used with ALPN.
+  const uint8_t alpn_dummy_val_[4] = {0x01, 0x62, 0x01, 0x61};
+
+ private:
+  static inline Mode ToMode(const std::string& str) {
+    return str == "TLS" ? STREAM : DGRAM;
+  }
+
+  void CheckResumption(SessionResumptionMode expected);
+  void CheckExtendedMasterSecret();
+  void CheckEarlyDataAccepted();
+
+  bool expect_extended_master_secret_;
+  bool expect_early_data_accepted_;
+
+  // Track groups and make sure that there are no duplicates.
+  class DuplicateGroupChecker {
+   public:
+    void AddAndCheckGroup(SSLNamedGroup group) {
+      EXPECT_EQ(groups_.end(), groups_.find(group))
+          << "Group " << group << " should not be duplicated";
+      groups_.insert(group);
+    }
+
+   private:
+    std::set<SSLNamedGroup> groups_;
+  };
+};
+
+// A non-parametrized TLS test base.
+class TlsConnectTest : public TlsConnectTestBase {
+ public:
+  TlsConnectTest() : TlsConnectTestBase(STREAM, 0) {}
+};
+
+// A non-parametrized DTLS-only test base.
+class DtlsConnectTest : public TlsConnectTestBase {
+ public:
+  DtlsConnectTest() : TlsConnectTestBase(DGRAM, 0) {}
+};
+
+// A TLS-only test base.
+class TlsConnectStream : public TlsConnectTestBase,
+                         public ::testing::WithParamInterface<uint16_t> {
+ public:
+  TlsConnectStream() : TlsConnectTestBase(STREAM, GetParam()) {}
+};
+
+// A TLS-only test base for tests before 1.3
+class TlsConnectStreamPre13 : public TlsConnectStream {};
+
+// A DTLS-only test base.
+class TlsConnectDatagram : public TlsConnectTestBase,
+                           public ::testing::WithParamInterface<uint16_t> {
+ public:
+  TlsConnectDatagram() : TlsConnectTestBase(DGRAM, GetParam()) {}
+};
+
+// A generic test class that can be either STREAM or DGRAM and a single version
+// of TLS.  This is configured in ssl_loopback_unittest.cc.  All uses of this
+// should use TEST_P().
+class TlsConnectGeneric
+    : public TlsConnectTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsConnectGeneric();
+};
+
+// A Pre TLS 1.2 generic test.
+class TlsConnectPre12
+    : public TlsConnectTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsConnectPre12();
+};
+
+// A TLS 1.2 only generic test.
+class TlsConnectTls12 : public TlsConnectTestBase,
+                        public ::testing::WithParamInterface<std::string> {
+ public:
+  TlsConnectTls12();
+};
+
+// A TLS 1.2 only stream test.
+class TlsConnectStreamTls12 : public TlsConnectTestBase {
+ public:
+  TlsConnectStreamTls12()
+      : TlsConnectTestBase(STREAM, SSL_LIBRARY_VERSION_TLS_1_2) {}
+};
+
+// A TLS 1.2+ generic test.
+class TlsConnectTls12Plus
+    : public TlsConnectTestBase,
+      public ::testing::WithParamInterface<std::tuple<std::string, uint16_t>> {
+ public:
+  TlsConnectTls12Plus();
+};
+
+// A TLS 1.3 only generic test.
+class TlsConnectTls13 : public TlsConnectTestBase,
+                        public ::testing::WithParamInterface<std::string> {
+ public:
+  TlsConnectTls13();
+};
+
+// A TLS 1.3 only stream test.
+class TlsConnectStreamTls13 : public TlsConnectTestBase {
+ public:
+  TlsConnectStreamTls13()
+      : TlsConnectTestBase(STREAM, SSL_LIBRARY_VERSION_TLS_1_3) {}
+};
+
+class TlsConnectDatagram13 : public TlsConnectTestBase {
+ public:
+  TlsConnectDatagram13()
+      : TlsConnectTestBase(DGRAM, SSL_LIBRARY_VERSION_TLS_1_3) {}
+};
+
+// A variant that is used only with Pre13.
+class TlsConnectGenericPre13 : public TlsConnectGeneric {};
+
+class TlsKeyExchangeTest : public TlsConnectGeneric {
+ protected:
+  TlsExtensionCapture* groups_capture_;
+  TlsExtensionCapture* shares_capture_;
+  TlsExtensionCapture* shares_capture2_;
+  TlsInspectorRecordHandshakeMessage* capture_hrr_;
+
+  void EnsureKeyShareSetup();
+  void ConfigNamedGroups(const std::vector<SSLNamedGroup>& groups);
+  std::vector<SSLNamedGroup> GetGroupDetails(const DataBuffer& ext);
+  std::vector<SSLNamedGroup> GetShareDetails(const DataBuffer& ext);
+  void CheckKEXDetails(const std::vector<SSLNamedGroup>& expectedGroups,
+                       const std::vector<SSLNamedGroup>& expectedShares);
+  void CheckKEXDetails(const std::vector<SSLNamedGroup>& expectedGroups,
+                       const std::vector<SSLNamedGroup>& expectedShares,
+                       SSLNamedGroup expectedShare2);
+
+ private:
+  void CheckKEXDetails(const std::vector<SSLNamedGroup>& expectedGroups,
+                       const std::vector<SSLNamedGroup>& expectedShares,
+                       bool expect_hrr);
+};
+
+class TlsKeyExchangeTest13 : public TlsKeyExchangeTest {};
+class TlsKeyExchangeTestPre13 : public TlsKeyExchangeTest {};
+
+}  // namespace nss_test
+
+#endif
diff --git a/security/nss/gtests/ssl_gtest/tls_filter.cc b/security/nss/gtests/ssl_gtest/tls_filter.cc
new file mode 100644
index 0000000000..4f7d195d0e
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_filter.cc
@@ -0,0 +1,503 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "tls_filter.h"
+#include "sslproto.h"
+
+extern "C" {
+// This is not something that should make you happy.
+#include "libssl_internals.h"
+}
+
+#include <iostream>
+#include "gtest_utils.h"
+#include "tls_agent.h"
+
+namespace nss_test {
+
+PacketFilter::Action TlsRecordFilter::Filter(const DataBuffer& input,
+                                             DataBuffer* output) {
+  bool changed = false;
+  size_t offset = 0U;
+  output->Allocate(input.len());
+
+  TlsParser parser(input);
+  while (parser.remaining()) {
+    RecordHeader header;
+    DataBuffer record;
+    if (!header.Parse(&parser, &record)) {
+      return KEEP;
+    }
+
+    if (FilterRecord(header, record, &offset, output) != KEEP) {
+      changed = true;
+    } else {
+      offset = header.Write(output, offset, record);
+    }
+  }
+  output->Truncate(offset);
+
+  // Record how many packets we actually touched.
+  if (changed) {
+    ++count_;
+    return (offset == 0) ? DROP : CHANGE;
+  }
+
+  return KEEP;
+}
+
+PacketFilter::Action TlsRecordFilter::FilterRecord(const RecordHeader& header,
+                                                   const DataBuffer& record,
+                                                   size_t* offset,
+                                                   DataBuffer* output) {
+  DataBuffer filtered;
+  PacketFilter::Action action = FilterRecord(header, record, &filtered);
+  if (action == KEEP) {
+    return KEEP;
+  }
+
+  if (action == DROP) {
+    std::cerr << "record drop: " << record << std::endl;
+    return DROP;
+  }
+
+  const DataBuffer* source = &record;
+  if (action == CHANGE) {
+    EXPECT_GT(0x10000U, filtered.len());
+    std::cerr << "record old: " << record << std::endl;
+    std::cerr << "record new: " << filtered << std::endl;
+    source = &filtered;
+  }
+
+  *offset = header.Write(output, *offset, *source);
+  return CHANGE;
+}
+
+bool TlsRecordFilter::RecordHeader::Parse(TlsParser* parser, DataBuffer* body) {
+  if (!parser->Read(&content_type_)) {
+    return false;
+  }
+
+  uint32_t version;
+  if (!parser->Read(&version, 2)) {
+    return false;
+  }
+  version_ = version;
+
+  sequence_number_ = 0;
+  if (IsDtls(version)) {
+    uint32_t tmp;
+    if (!parser->Read(&tmp, 4)) {
+      return false;
+    }
+    sequence_number_ = static_cast<uint64_t>(tmp) << 32;
+    if (!parser->Read(&tmp, 4)) {
+      return false;
+    }
+    sequence_number_ |= static_cast<uint64_t>(tmp);
+  }
+  return parser->ReadVariable(body, 2);
+}
+
+size_t TlsRecordFilter::RecordHeader::Write(DataBuffer* buffer, size_t offset,
+                                            const DataBuffer& body) const {
+  offset = buffer->Write(offset, content_type_, 1);
+  offset = buffer->Write(offset, version_, 2);
+  if (is_dtls()) {
+    // write epoch (2 octet), and seqnum (6 octet)
+    offset = buffer->Write(offset, sequence_number_ >> 32, 4);
+    offset = buffer->Write(offset, sequence_number_ & 0xffffffff, 4);
+  }
+  offset = buffer->Write(offset, body.len(), 2);
+  offset = buffer->Write(offset, body);
+  return offset;
+}
+
+PacketFilter::Action TlsHandshakeFilter::FilterRecord(
+    const RecordHeader& record_header, const DataBuffer& input,
+    DataBuffer* output) {
+  // Check that the first byte is as requested.
+  if (record_header.content_type() != kTlsHandshakeType) {
+    return KEEP;
+  }
+
+  bool changed = false;
+  size_t offset = 0U;
+  output->Allocate(input.len());  // Preallocate a little.
+
+  TlsParser parser(input);
+  while (parser.remaining()) {
+    HandshakeHeader header;
+    DataBuffer handshake;
+    if (!header.Parse(&parser, record_header, &handshake)) {
+      return KEEP;
+    }
+
+    DataBuffer filtered;
+    PacketFilter::Action action = FilterHandshake(header, handshake, &filtered);
+    if (action == DROP) {
+      changed = true;
+      std::cerr << "handshake drop: " << handshake << std::endl;
+      continue;
+    }
+
+    const DataBuffer* source = &handshake;
+    if (action == CHANGE) {
+      EXPECT_GT(0x1000000U, filtered.len());
+      changed = true;
+      std::cerr << "handshake old: " << handshake << std::endl;
+      std::cerr << "handshake new: " << filtered << std::endl;
+      source = &filtered;
+    }
+
+    offset = header.Write(output, offset, *source);
+  }
+  output->Truncate(offset);
+  return changed ? (offset ? CHANGE : DROP) : KEEP;
+}
+
+bool TlsHandshakeFilter::HandshakeHeader::ReadLength(TlsParser* parser,
+                                                     const RecordHeader& header,
+                                                     uint32_t* length) {
+  if (!parser->Read(length, 3)) {
+    return false;  // malformed
+  }
+
+  if (!header.is_dtls()) {
+    return true;  // nothing left to do
+  }
+
+  // Read and check DTLS parameters
+  uint32_t message_seq_tmp;
+  if (!parser->Read(&message_seq_tmp, 2)) {  // sequence number
+    return false;
+  }
+  message_seq_ = message_seq_tmp;
+
+  uint32_t fragment_offset;
+  if (!parser->Read(&fragment_offset, 3)) {
+    return false;
+  }
+
+  uint32_t fragment_length;
+  if (!parser->Read(&fragment_length, 3)) {
+    return false;
+  }
+
+  // All current tests where we are using this code don't fragment.
+  return (fragment_offset == 0 && fragment_length == *length);
+}
+
+bool TlsHandshakeFilter::HandshakeHeader::Parse(
+    TlsParser* parser, const RecordHeader& record_header, DataBuffer* body) {
+  version_ = record_header.version();
+  if (!parser->Read(&handshake_type_)) {
+    return false;  // malformed
+  }
+  uint32_t length;
+  if (!ReadLength(parser, record_header, &length)) {
+    return false;
+  }
+
+  return parser->Read(body, length);
+}
+
+size_t TlsHandshakeFilter::HandshakeHeader::Write(
+    DataBuffer* buffer, size_t offset, const DataBuffer& body) const {
+  offset = buffer->Write(offset, handshake_type(), 1);
+  offset = buffer->Write(offset, body.len(), 3);
+  if (is_dtls()) {
+    offset = buffer->Write(offset, message_seq_, 2);
+    offset = buffer->Write(offset, 0U, 3);  // fragment_offset
+    offset = buffer->Write(offset, body.len(), 3);
+  }
+  offset = buffer->Write(offset, body);
+  return offset;
+}
+
+PacketFilter::Action TlsInspectorRecordHandshakeMessage::FilterHandshake(
+    const HandshakeHeader& header, const DataBuffer& input,
+    DataBuffer* output) {
+  // Only do this once.
+  if (buffer_.len()) {
+    return KEEP;
+  }
+
+  if (header.handshake_type() == handshake_type_) {
+    buffer_ = input;
+  }
+  return KEEP;
+}
+
+PacketFilter::Action TlsInspectorReplaceHandshakeMessage::FilterHandshake(
+    const HandshakeHeader& header, const DataBuffer& input,
+    DataBuffer* output) {
+  if (header.handshake_type() == handshake_type_) {
+    *output = buffer_;
+    return CHANGE;
+  }
+
+  return KEEP;
+}
+
+PacketFilter::Action TlsConversationRecorder::FilterRecord(
+    const RecordHeader& header, const DataBuffer& input, DataBuffer* output) {
+  buffer_.Append(input);
+  return KEEP;
+}
+
+PacketFilter::Action TlsAlertRecorder::FilterRecord(const RecordHeader& header,
+                                                    const DataBuffer& input,
+                                                    DataBuffer* output) {
+  if (level_ == kTlsAlertFatal) {  // already fatal
+    return KEEP;
+  }
+  if (header.content_type() != kTlsAlertType) {
+    return KEEP;
+  }
+
+  std::cerr << "Alert: " << input << std::endl;
+
+  TlsParser parser(input);
+  uint8_t lvl;
+  if (!parser.Read(&lvl)) {
+    return KEEP;
+  }
+  if (lvl == kTlsAlertWarning) {  // not strong enough
+    return KEEP;
+  }
+  level_ = lvl;
+  (void)parser.Read(&description_);
+  return KEEP;
+}
+
+ChainedPacketFilter::~ChainedPacketFilter() {
+  for (auto it = filters_.begin(); it != filters_.end(); ++it) {
+    delete *it;
+  }
+}
+
+PacketFilter::Action ChainedPacketFilter::Filter(const DataBuffer& input,
+                                                 DataBuffer* output) {
+  DataBuffer in(input);
+  bool changed = false;
+  for (auto it = filters_.begin(); it != filters_.end(); ++it) {
+    PacketFilter::Action action = (*it)->Filter(in, output);
+    if (action == DROP) {
+      return DROP;
+    }
+    if (action == CHANGE) {
+      in = *output;
+      changed = true;
+    }
+  }
+  return changed ? CHANGE : KEEP;
+}
+
+PacketFilter::Action TlsExtensionFilter::FilterHandshake(
+    const HandshakeHeader& header, const DataBuffer& input,
+    DataBuffer* output) {
+  if (header.handshake_type() == kTlsHandshakeClientHello) {
+    TlsParser parser(input);
+    if (!FindClientHelloExtensions(&parser, header)) {
+      return KEEP;
+    }
+    return FilterExtensions(&parser, input, output);
+  }
+  if (header.handshake_type() == kTlsHandshakeServerHello) {
+    TlsParser parser(input);
+    if (!FindServerHelloExtensions(&parser)) {
+      return KEEP;
+    }
+    return FilterExtensions(&parser, input, output);
+  }
+  return KEEP;
+}
+
+bool TlsExtensionFilter::FindClientHelloExtensions(TlsParser* parser,
+                                                   const Versioned& header) {
+  if (!parser->Skip(2 + 32)) {  // version + random
+    return false;
+  }
+  if (!parser->SkipVariable(1)) {  // session ID
+    return false;
+  }
+  if (header.is_dtls() && !parser->SkipVariable(1)) {  // DTLS cookie
+    return false;
+  }
+  if (!parser->SkipVariable(2)) {  // cipher suites
+    return false;
+  }
+  if (!parser->SkipVariable(1)) {  // compression methods
+    return false;
+  }
+  return true;
+}
+
+bool TlsExtensionFilter::FindServerHelloExtensions(TlsParser* parser) {
+  uint32_t vtmp;
+  if (!parser->Read(&vtmp, 2)) {
+    return false;
+  }
+  uint16_t version = static_cast<uint16_t>(vtmp);
+  if (!parser->Skip(32)) {  // random
+    return false;
+  }
+  if (NormalizeTlsVersion(version) <= SSL_LIBRARY_VERSION_TLS_1_2) {
+    if (!parser->SkipVariable(1)) {  // session ID
+      return false;
+    }
+  }
+  if (!parser->Skip(2)) {  // cipher suite
+    return false;
+  }
+  if (NormalizeTlsVersion(version) <= SSL_LIBRARY_VERSION_TLS_1_2) {
+    if (!parser->Skip(1)) {  // compression method
+      return false;
+    }
+  }
+  return true;
+}
+
+PacketFilter::Action TlsExtensionFilter::FilterExtensions(
+    TlsParser* parser, const DataBuffer& input, DataBuffer* output) {
+  size_t length_offset = parser->consumed();
+  uint32_t all_extensions;
+  if (!parser->Read(&all_extensions, 2)) {
+    return KEEP;  // no extensions, odd but OK
+  }
+  if (all_extensions != parser->remaining()) {
+    return KEEP;  // malformed
+  }
+
+  bool changed = false;
+
+  // Write out the start of the message.
+  output->Allocate(input.len());
+  size_t offset = output->Write(0, input.data(), parser->consumed());
+
+  while (parser->remaining()) {
+    uint32_t extension_type;
+    if (!parser->Read(&extension_type, 2)) {
+      return KEEP;  // malformed
+    }
+
+    DataBuffer extension;
+    if (!parser->ReadVariable(&extension, 2)) {
+      return KEEP;  // malformed
+    }
+
+    DataBuffer filtered;
+    PacketFilter::Action action =
+        FilterExtension(extension_type, extension, &filtered);
+    if (action == DROP) {
+      changed = true;
+      std::cerr << "extension drop: " << extension << std::endl;
+      continue;
+    }
+
+    const DataBuffer* source = &extension;
+    if (action == CHANGE) {
+      EXPECT_GT(0x10000U, filtered.len());
+      changed = true;
+      std::cerr << "extension old: " << extension << std::endl;
+      std::cerr << "extension new: " << filtered << std::endl;
+      source = &filtered;
+    }
+
+    // Write out extension.
+    offset = output->Write(offset, extension_type, 2);
+    offset = output->Write(offset, source->len(), 2);
+    if (source->len() > 0) {
+      offset = output->Write(offset, *source);
+    }
+  }
+  output->Truncate(offset);
+
+  if (changed) {
+    size_t newlen = output->len() - length_offset - 2;
+    EXPECT_GT(0x10000U, newlen);
+    if (newlen >= 0x10000) {
+      return KEEP;  // bad: size increased too much
+    }
+    output->Write(length_offset, newlen, 2);
+    return CHANGE;
+  }
+  return KEEP;
+}
+
+PacketFilter::Action TlsExtensionCapture::FilterExtension(
+    uint16_t extension_type, const DataBuffer& input, DataBuffer* output) {
+  if (extension_type == extension_ && (last_ || !captured_)) {
+    data_.Assign(input);
+    captured_ = true;
+  }
+  return KEEP;
+}
+
+PacketFilter::Action TlsExtensionReplacer::FilterExtension(
+    uint16_t extension_type, const DataBuffer& input, DataBuffer* output) {
+  if (extension_type != extension_) {
+    return KEEP;
+  }
+
+  *output = data_;
+  return CHANGE;
+}
+
+PacketFilter::Action TlsExtensionDropper::FilterExtension(
+    uint16_t extension_type, const DataBuffer& input, DataBuffer* output) {
+  if (extension_type == extension_) {
+    return DROP;
+  }
+  return KEEP;
+}
+
+PacketFilter::Action AfterRecordN::FilterRecord(const RecordHeader& header,
+                                                const DataBuffer& body,
+                                                DataBuffer* out) {
+  if (counter_++ == record_) {
+    DataBuffer buf;
+    header.Write(&buf, 0, body);
+    src_->SendDirect(buf);
+    dest_->Handshake();
+    func_();
+    return DROP;
+  }
+
+  return KEEP;
+}
+
+PacketFilter::Action TlsInspectorClientHelloVersionChanger::FilterHandshake(
+    const HandshakeHeader& header, const DataBuffer& input,
+    DataBuffer* output) {
+  if (header.handshake_type() == kTlsHandshakeClientKeyExchange) {
+    EXPECT_EQ(SECSuccess,
+              SSLInt_IncrementClientHandshakeVersion(server_->ssl_fd()));
+  }
+  return KEEP;
+}
+
+PacketFilter::Action SelectiveDropFilter::Filter(const DataBuffer& input,
+                                                 DataBuffer* output) {
+  if (counter_ >= 32) {
+    return KEEP;
+  }
+  return ((1 << counter_++) & pattern_) ? DROP : KEEP;
+}
+
+PacketFilter::Action TlsInspectorClientHelloVersionSetter::FilterHandshake(
+    const HandshakeHeader& header, const DataBuffer& input,
+    DataBuffer* output) {
+  if (header.handshake_type() == kTlsHandshakeClientHello) {
+    *output = input;
+    output->Write(0, version_, 2);
+    return CHANGE;
+  }
+  return KEEP;
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/tls_filter.h b/security/nss/gtests/ssl_gtest/tls_filter.h
new file mode 100644
index 0000000000..fa2e387858
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_filter.h
@@ -0,0 +1,343 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef tls_filter_h_
+#define tls_filter_h_
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include "test_io.h"
+#include "tls_parser.h"
+
+namespace nss_test {
+
+// Abstract filter that operates on entire (D)TLS records.
+class TlsRecordFilter : public PacketFilter {
+ public:
+  TlsRecordFilter() : count_(0) {}
+
+  // External interface. Overrides PacketFilter.
+  PacketFilter::Action Filter(const DataBuffer& input, DataBuffer* output);
+
+  // Report how many packets were altered by the filter.
+  size_t filtered_packets() const { return count_; }
+
+  class Versioned {
+   public:
+    Versioned() : version_(0) {}
+    explicit Versioned(uint16_t version) : version_(version) {}
+
+    bool is_dtls() const { return IsDtls(version_); }
+    uint16_t version() const { return version_; }
+
+   protected:
+    uint16_t version_;
+  };
+
+  class RecordHeader : public Versioned {
+   public:
+    RecordHeader() : Versioned(), content_type_(0), sequence_number_(0) {}
+    RecordHeader(uint16_t version, uint8_t content_type,
+                 uint64_t sequence_number)
+        : Versioned(version),
+          content_type_(content_type),
+          sequence_number_(sequence_number) {}
+
+    uint8_t content_type() const { return content_type_; }
+    uint64_t sequence_number() const { return sequence_number_; }
+    size_t header_length() const { return is_dtls() ? 11 : 3; }
+
+    // Parse the header; return true if successful; body in an outparam if OK.
+    bool Parse(TlsParser* parser, DataBuffer* body);
+    // Write the header and body to a buffer at the given offset.
+    // Return the offset of the end of the write.
+    size_t Write(DataBuffer* buffer, size_t offset,
+                 const DataBuffer& body) const;
+
+   private:
+    uint8_t content_type_;
+    uint64_t sequence_number_;
+  };
+
+ protected:
+  // There are two filter functions which can be overriden. Both are
+  // called with the header and the record but the outer one is called
+  // with a raw pointer to let you write into the buffer and lets you
+  // do anything with this section of the stream. The inner one
+  // just lets you change the record contents. By default, the
+  // outer one calls the inner one, so if you override the outer
+  // one, the inner one is never called unless you call it yourself.
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& record,
+                                            size_t* offset, DataBuffer* output);
+
+  // The record filter receives the record contentType, version and DTLS
+  // sequence number (which is zero for TLS), plus the existing record payload.
+  // It returns an action (KEEP, CHANGE, DROP).  It writes to the `changed`
+  // outparam with the new record contents if it chooses to CHANGE the record.
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& data,
+                                            DataBuffer* changed) {
+    return KEEP;
+  }
+
+ private:
+  size_t count_;
+};
+
+// Abstract filter that operates on handshake messages rather than records.
+// This assumes that the handshake messages are written in a block as entire
+// records and that they don't span records or anything crazy like that.
+class TlsHandshakeFilter : public TlsRecordFilter {
+ public:
+  TlsHandshakeFilter() {}
+
+  class HandshakeHeader : public Versioned {
+   public:
+    HandshakeHeader() : Versioned(), handshake_type_(0), message_seq_(0) {}
+
+    uint8_t handshake_type() const { return handshake_type_; }
+    bool Parse(TlsParser* parser, const RecordHeader& record_header,
+               DataBuffer* body);
+    size_t Write(DataBuffer* buffer, size_t offset,
+                 const DataBuffer& body) const;
+
+   private:
+    // Reads the length from the record header.
+    // This also reads the DTLS fragment information and checks it.
+    bool ReadLength(TlsParser* parser, const RecordHeader& header,
+                    uint32_t* length);
+
+    uint8_t handshake_type_;
+    uint16_t message_seq_;
+    // fragment_offset is always zero in these tests.
+  };
+
+ protected:
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& input,
+                                            DataBuffer* output);
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) = 0;
+
+ private:
+};
+
+// Make a copy of the first instance of a handshake message.
+class TlsInspectorRecordHandshakeMessage : public TlsHandshakeFilter {
+ public:
+  TlsInspectorRecordHandshakeMessage(uint8_t handshake_type)
+      : handshake_type_(handshake_type), buffer_() {}
+
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output);
+
+  const DataBuffer& buffer() const { return buffer_; }
+
+ private:
+  uint8_t handshake_type_;
+  DataBuffer buffer_;
+};
+
+// Replace all instances of a handshake message.
+class TlsInspectorReplaceHandshakeMessage : public TlsHandshakeFilter {
+ public:
+  TlsInspectorReplaceHandshakeMessage(uint8_t handshake_type,
+                                      const DataBuffer& replacement)
+      : handshake_type_(handshake_type), buffer_(replacement) {}
+
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output);
+
+ private:
+  uint8_t handshake_type_;
+  DataBuffer buffer_;
+};
+
+// Make a copy of the complete conversation.
+class TlsConversationRecorder : public TlsRecordFilter {
+ public:
+  TlsConversationRecorder(DataBuffer& buffer) : buffer_(buffer) {}
+
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& input,
+                                            DataBuffer* output);
+
+ private:
+  DataBuffer& buffer_;
+};
+
+// Records an alert.  If an alert has already been recorded, it won't save the
+// new alert unless the old alert is a warning and the new one is fatal.
+class TlsAlertRecorder : public TlsRecordFilter {
+ public:
+  TlsAlertRecorder() : level_(255), description_(255) {}
+
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& input,
+                                            DataBuffer* output);
+
+  uint8_t level() const { return level_; }
+  uint8_t description() const { return description_; }
+
+ private:
+  uint8_t level_;
+  uint8_t description_;
+};
+
+// Runs multiple packet filters in series.
+class ChainedPacketFilter : public PacketFilter {
+ public:
+  ChainedPacketFilter() {}
+  ChainedPacketFilter(const std::vector<PacketFilter*> filters)
+      : filters_(filters.begin(), filters.end()) {}
+  virtual ~ChainedPacketFilter();
+
+  virtual PacketFilter::Action Filter(const DataBuffer& input,
+                                      DataBuffer* output);
+
+  // Takes ownership of the filter.
+  void Add(PacketFilter* filter) { filters_.push_back(filter); }
+
+ private:
+  std::vector<PacketFilter*> filters_;
+};
+
+class TlsExtensionFilter : public TlsHandshakeFilter {
+ protected:
+  PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                       const DataBuffer& input,
+                                       DataBuffer* output) override;
+
+  virtual PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                               const DataBuffer& input,
+                                               DataBuffer* output) = 0;
+
+ public:
+  static bool FindClientHelloExtensions(TlsParser* parser,
+                                        const Versioned& header);
+  static bool FindServerHelloExtensions(TlsParser* parser);
+
+ private:
+  PacketFilter::Action FilterExtensions(TlsParser* parser,
+                                        const DataBuffer& input,
+                                        DataBuffer* output);
+};
+
+class TlsExtensionCapture : public TlsExtensionFilter {
+ public:
+  TlsExtensionCapture(uint16_t ext, bool last = false)
+      : extension_(ext), captured_(false), last_(last), data_() {}
+
+  const DataBuffer& extension() const { return data_; }
+  bool captured() const { return captured_; }
+
+ protected:
+  PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                       const DataBuffer& input,
+                                       DataBuffer* output) override;
+
+ private:
+  const uint16_t extension_;
+  bool captured_;
+  bool last_;
+  DataBuffer data_;
+};
+
+class TlsExtensionReplacer : public TlsExtensionFilter {
+ public:
+  TlsExtensionReplacer(uint16_t extension, const DataBuffer& data)
+      : extension_(extension), data_(data) {}
+  PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                       const DataBuffer& input,
+                                       DataBuffer* output) override;
+
+ private:
+  const uint16_t extension_;
+  const DataBuffer data_;
+};
+
+class TlsExtensionDropper : public TlsExtensionFilter {
+ public:
+  TlsExtensionDropper(uint16_t extension) : extension_(extension) {}
+  PacketFilter::Action FilterExtension(uint16_t extension_type,
+                                       const DataBuffer&, DataBuffer*) override;
+
+ private:
+  uint16_t extension_;
+};
+
+class TlsAgent;
+typedef std::function<void(void)> VoidFunction;
+
+class AfterRecordN : public TlsRecordFilter {
+ public:
+  AfterRecordN(TlsAgent* src, TlsAgent* dest, unsigned int record,
+               VoidFunction func)
+      : src_(src), dest_(dest), record_(record), func_(func), counter_(0) {}
+
+  virtual PacketFilter::Action FilterRecord(const RecordHeader& header,
+                                            const DataBuffer& body,
+                                            DataBuffer* out) override;
+
+ private:
+  TlsAgent* src_;
+  TlsAgent* dest_;
+  unsigned int record_;
+  VoidFunction func_;
+  unsigned int counter_;
+};
+
+// When we see the ClientKeyExchange from |client|, increment the
+// ClientHelloVersion on |server|.
+class TlsInspectorClientHelloVersionChanger : public TlsHandshakeFilter {
+ public:
+  TlsInspectorClientHelloVersionChanger(TlsAgent* server) : server_(server) {}
+
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output);
+
+ private:
+  TlsAgent* server_;
+};
+
+// This class selectively drops complete writes.  This relies on the fact that
+// writes in libssl are on record boundaries.
+class SelectiveDropFilter : public PacketFilter {
+ public:
+  SelectiveDropFilter(uint32_t pattern) : pattern_(pattern), counter_(0) {}
+
+ protected:
+  virtual PacketFilter::Action Filter(const DataBuffer& input,
+                                      DataBuffer* output) override;
+
+ private:
+  const uint32_t pattern_;
+  uint8_t counter_;
+};
+
+// Set the version number in the ClientHello.
+class TlsInspectorClientHelloVersionSetter : public TlsHandshakeFilter {
+ public:
+  TlsInspectorClientHelloVersionSetter(uint16_t version) : version_(version) {}
+
+  virtual PacketFilter::Action FilterHandshake(const HandshakeHeader& header,
+                                               const DataBuffer& input,
+                                               DataBuffer* output);
+
+ private:
+  uint16_t version_;
+};
+
+}  // namespace nss_test
+
+#endif
diff --git a/security/nss/gtests/ssl_gtest/tls_hkdf_unittest.cc b/security/nss/gtests/ssl_gtest/tls_hkdf_unittest.cc
new file mode 100644
index 0000000000..51ff938b14
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_hkdf_unittest.cc
@@ -0,0 +1,262 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <memory>
+#include "nss.h"
+#include "pk11pub.h"
+#include "tls13hkdf.h"
+
+#include "databuffer.h"
+#include "gtest_utils.h"
+#include "scoped_ptrs.h"
+
+namespace nss_test {
+
+const uint8_t kKey1Data[] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
+    0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
+    0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f};
+const DataBuffer kKey1(kKey1Data, sizeof(kKey1Data));
+
+// The same as key1 but with the first byte
+// 0x01.
+const uint8_t kKey2Data[] = {
+    0x01, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
+    0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
+    0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f};
+const DataBuffer kKey2(kKey2Data, sizeof(kKey2Data));
+
+const char kLabelMasterSecret[] = "master secret";
+
+const uint8_t kSessionHash[] = {
+    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb,
+    0xfc, 0xfd, 0xfe, 0xff, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
+    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xd0, 0xd1, 0xd2, 0xd3,
+    0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
+    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb,
+    0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
+    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0xe0, 0xe1, 0xe2, 0xe3,
+    0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
+    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb,
+    0xfc, 0xfd, 0xfe, 0xff,
+};
+
+const size_t kHashLength[] = {
+    0,  /* ssl_hash_none   */
+    16, /* ssl_hash_md5    */
+    20, /* ssl_hash_sha1   */
+    28, /* ssl_hash_sha224 */
+    32, /* ssl_hash_sha256 */
+    48, /* ssl_hash_sha384 */
+    64, /* ssl_hash_sha512 */
+};
+
+const std::string kHashName[] = {"None",    "MD5",     "SHA-1",  "SHA-224",
+                                 "SHA-256", "SHA-384", "SHA-512"};
+
+static void ImportKey(ScopedPK11SymKey* to, const DataBuffer& key,
+                      PK11SlotInfo* slot) {
+  SECItem key_item = {siBuffer, const_cast<uint8_t*>(key.data()),
+                      static_cast<unsigned int>(key.len())};
+
+  PK11SymKey* inner =
+      PK11_ImportSymKey(slot, CKM_SSL3_MASTER_KEY_DERIVE, PK11_OriginUnwrap,
+                        CKA_DERIVE, &key_item, NULL);
+  ASSERT_NE(nullptr, inner);
+  to->reset(inner);
+}
+
+static void DumpData(const std::string& label, const uint8_t* buf, size_t len) {
+  DataBuffer d(buf, len);
+
+  std::cerr << label << ": " << d << std::endl;
+}
+
+void DumpKey(const std::string& label, ScopedPK11SymKey& key) {
+  SECStatus rv = PK11_ExtractKeyValue(key.get());
+  ASSERT_EQ(SECSuccess, rv);
+
+  SECItem* key_data = PK11_GetKeyData(key.get());
+  ASSERT_NE(nullptr, key_data);
+
+  DumpData(label, key_data->data, key_data->len);
+}
+
+extern "C" {
+extern char ssl_trace;
+extern FILE* ssl_trace_iob;
+}
+
+class TlsHkdfTest : public ::testing::Test,
+                    public ::testing::WithParamInterface<SSLHashType> {
+ public:
+  TlsHkdfTest()
+      : k1_(), k2_(), hash_type_(GetParam()), slot_(PK11_GetInternalSlot()) {
+    EXPECT_NE(nullptr, slot_);
+    char* ev = getenv("SSLTRACE");
+    if (ev && ev[0]) {
+      ssl_trace = atoi(ev);
+      ssl_trace_iob = stderr;
+    }
+  }
+
+  void SetUp() {
+    ImportKey(&k1_, kKey1, slot_.get());
+    ImportKey(&k2_, kKey2, slot_.get());
+  }
+
+  void VerifyKey(const ScopedPK11SymKey& key, const DataBuffer& expected) {
+    SECStatus rv = PK11_ExtractKeyValue(key.get());
+    ASSERT_EQ(SECSuccess, rv);
+
+    SECItem* key_data = PK11_GetKeyData(key.get());
+    ASSERT_NE(nullptr, key_data);
+
+    EXPECT_EQ(expected.len(), key_data->len);
+    EXPECT_EQ(0, memcmp(expected.data(), key_data->data, expected.len()));
+  }
+
+  void HkdfExtract(const ScopedPK11SymKey& ikmk1, const ScopedPK11SymKey& ikmk2,
+                   SSLHashType base_hash, const DataBuffer& expected) {
+    std::cerr << "Hash = " << kHashName[base_hash] << std::endl;
+
+    PK11SymKey* prk = nullptr;
+    SECStatus rv = tls13_HkdfExtract(ikmk1.get(), ikmk2.get(), base_hash, &prk);
+    ASSERT_EQ(SECSuccess, rv);
+    ScopedPK11SymKey prkk(prk);
+
+    DumpKey("Output", prkk);
+    VerifyKey(prkk, expected);
+  }
+
+  void HkdfExpandLabel(ScopedPK11SymKey* prk, SSLHashType base_hash,
+                       const uint8_t* session_hash, size_t session_hash_len,
+                       const char* label, size_t label_len,
+                       const DataBuffer& expected) {
+    std::cerr << "Hash = " << kHashName[base_hash] << std::endl;
+
+    std::vector<uint8_t> output(expected.len());
+
+    SECStatus rv = tls13_HkdfExpandLabelRaw(prk->get(), base_hash, session_hash,
+                                            session_hash_len, label, label_len,
+                                            &output[0], output.size());
+    ASSERT_EQ(SECSuccess, rv);
+    DumpData("Output", &output[0], output.size());
+    EXPECT_EQ(0, memcmp(expected.data(), &output[0], expected.len()));
+  }
+
+ protected:
+  ScopedPK11SymKey k1_;
+  ScopedPK11SymKey k2_;
+  SSLHashType hash_type_;
+
+ private:
+  ScopedPK11SlotInfo slot_;
+};
+
+TEST_P(TlsHkdfTest, HkdfNullNull) {
+  const uint8_t tv[][48] = {
+      {/* ssl_hash_none   */},
+      {/* ssl_hash_md5    */},
+      {/* ssl_hash_sha1   */},
+      {/* ssl_hash_sha224 */},
+      {0x33, 0xad, 0x0a, 0x1c, 0x60, 0x7e, 0xc0, 0x3b, 0x09, 0xe6, 0xcd,
+       0x98, 0x93, 0x68, 0x0c, 0xe2, 0x10, 0xad, 0xf3, 0x00, 0xaa, 0x1f,
+       0x26, 0x60, 0xe1, 0xb2, 0x2e, 0x10, 0xf1, 0x70, 0xf9, 0x2a},
+      {0x7e, 0xe8, 0x20, 0x6f, 0x55, 0x70, 0x02, 0x3e, 0x6d, 0xc7, 0x51, 0x9e,
+       0xb1, 0x07, 0x3b, 0xc4, 0xe7, 0x91, 0xad, 0x37, 0xb5, 0xc3, 0x82, 0xaa,
+       0x10, 0xba, 0x18, 0xe2, 0x35, 0x7e, 0x71, 0x69, 0x71, 0xf9, 0x36, 0x2f,
+       0x2c, 0x2f, 0xe2, 0xa7, 0x6b, 0xfd, 0x78, 0xdf, 0xec, 0x4e, 0xa9, 0xb5}};
+
+  const DataBuffer expected_data(tv[hash_type_], kHashLength[hash_type_]);
+  HkdfExtract(nullptr, nullptr, hash_type_, expected_data);
+}
+
+TEST_P(TlsHkdfTest, HkdfKey1Only) {
+  const uint8_t tv[][48] = {
+      {/* ssl_hash_none   */},
+      {/* ssl_hash_md5    */},
+      {/* ssl_hash_sha1   */},
+      {/* ssl_hash_sha224 */},
+      {0x11, 0x87, 0x38, 0x28, 0xa9, 0x19, 0x78, 0x11, 0x33, 0x91, 0x24,
+       0xb5, 0x8a, 0x1b, 0xb0, 0x9f, 0x7f, 0x0d, 0x8d, 0xbb, 0x10, 0xf4,
+       0x9c, 0x54, 0xbd, 0x1f, 0xd8, 0x85, 0xcd, 0x15, 0x30, 0x33},
+      {0x51, 0xb1, 0xd5, 0xb4, 0x59, 0x79, 0x79, 0x08, 0x4a, 0x15, 0xb2, 0xdb,
+       0x84, 0xd3, 0xd6, 0xbc, 0xfc, 0x93, 0x45, 0xd9, 0xdc, 0x74, 0xda, 0x1a,
+       0x57, 0xc2, 0x76, 0x9f, 0x3f, 0x83, 0x45, 0x2f, 0xf6, 0xf3, 0x56, 0x1f,
+       0x58, 0x63, 0xdb, 0x88, 0xda, 0x40, 0xce, 0x63, 0x7d, 0x24, 0x37, 0xf3}};
+
+  const DataBuffer expected_data(tv[hash_type_], kHashLength[hash_type_]);
+  HkdfExtract(k1_, nullptr, hash_type_, expected_data);
+}
+
+TEST_P(TlsHkdfTest, HkdfKey2Only) {
+  const uint8_t tv[][48] = {
+      {/* ssl_hash_none   */},
+      {/* ssl_hash_md5    */},
+      {/* ssl_hash_sha1   */},
+      {/* ssl_hash_sha224 */},
+      {
+          0x2f, 0x5f, 0x78, 0xd0, 0xa4, 0xc4, 0x36, 0xee, 0x6c, 0x8a, 0x4e,
+          0xf9, 0xd0, 0x43, 0x81, 0x02, 0x13, 0xfd, 0x47, 0x83, 0x63, 0x3a,
+          0xd2, 0xe1, 0x40, 0x6d, 0x2d, 0x98, 0x00, 0xfd, 0xc1, 0x87,
+      },
+      {0x7b, 0x40, 0xf9, 0xef, 0x91, 0xff, 0xc9, 0xd1, 0x29, 0x24, 0x5c, 0xbf,
+       0xf8, 0x82, 0x76, 0x68, 0xae, 0x4b, 0x63, 0xe8, 0x03, 0xdd, 0x39, 0xa8,
+       0xd4, 0x6a, 0xf6, 0xe5, 0xec, 0xea, 0xf8, 0x7d, 0x91, 0x71, 0x81, 0xf1,
+       0xdb, 0x3b, 0xaf, 0xbf, 0xde, 0x71, 0x61, 0x15, 0xeb, 0xb5, 0x5f, 0x68}};
+
+  const DataBuffer expected_data(tv[hash_type_], kHashLength[hash_type_]);
+  HkdfExtract(nullptr, k2_, hash_type_, expected_data);
+}
+
+TEST_P(TlsHkdfTest, HkdfKey1Key2) {
+  const uint8_t tv[][48] = {
+      {/* ssl_hash_none   */},
+      {/* ssl_hash_md5    */},
+      {/* ssl_hash_sha1   */},
+      {/* ssl_hash_sha224 */},
+      {
+          0x79, 0x53, 0xb8, 0xdd, 0x6b, 0x98, 0xce, 0x00, 0xb7, 0xdc, 0xe8,
+          0x03, 0x70, 0x8c, 0xe3, 0xac, 0x06, 0x8b, 0x22, 0xfd, 0x0e, 0x34,
+          0x48, 0xe6, 0xe5, 0xe0, 0x8a, 0xd6, 0x16, 0x18, 0xe5, 0x48,
+      },
+      {0x01, 0x93, 0xc0, 0x07, 0x3f, 0x6a, 0x83, 0x0e, 0x2e, 0x4f, 0xb2, 0x58,
+       0xe4, 0x00, 0x08, 0x5c, 0x68, 0x9c, 0x37, 0x32, 0x00, 0x37, 0xff, 0xc3,
+       0x1c, 0x5b, 0x98, 0x0b, 0x02, 0x92, 0x3f, 0xfd, 0x73, 0x5a, 0x6f, 0x2a,
+       0x95, 0xa3, 0xee, 0xf6, 0xd6, 0x8e, 0x6f, 0x86, 0xea, 0x63, 0xf8, 0x33}};
+
+  const DataBuffer expected_data(tv[hash_type_], kHashLength[hash_type_]);
+  HkdfExtract(k1_, k2_, hash_type_, expected_data);
+}
+
+TEST_P(TlsHkdfTest, HkdfExpandLabel) {
+  const uint8_t tv[][48] = {
+      {/* ssl_hash_none   */},
+      {/* ssl_hash_md5    */},
+      {/* ssl_hash_sha1   */},
+      {/* ssl_hash_sha224 */},
+      {0x34, 0x7c, 0x67, 0x80, 0xff, 0x0b, 0xba, 0xd7, 0x1c, 0x28, 0x3b,
+       0x16, 0xeb, 0x2f, 0x9c, 0xf6, 0x2d, 0x24, 0xe6, 0xcd, 0xb6, 0x13,
+       0xd5, 0x17, 0x76, 0x54, 0x8c, 0xb0, 0x7d, 0xcd, 0xe7, 0x4c},
+      {0x4b, 0x1e, 0x5e, 0xc1, 0x49, 0x30, 0x78, 0xea, 0x35, 0xbd, 0x3f, 0x01,
+       0x04, 0xe6, 0x1a, 0xea, 0x14, 0xcc, 0x18, 0x2a, 0xd1, 0xc4, 0x76, 0x21,
+       0xc4, 0x64, 0xc0, 0x4e, 0x4b, 0x36, 0x16, 0x05, 0x6f, 0x04, 0xab, 0xe9,
+       0x43, 0xb1, 0x2d, 0xa8, 0xa7, 0x17, 0x9a, 0x5f, 0x09, 0x91, 0x7d, 0x1f}};
+
+  const DataBuffer expected_data(tv[hash_type_], kHashLength[hash_type_]);
+  HkdfExpandLabel(&k1_, hash_type_, kSessionHash, kHashLength[hash_type_],
+                  kLabelMasterSecret, strlen(kLabelMasterSecret),
+                  expected_data);
+}
+
+static const SSLHashType kHashTypes[] = {ssl_hash_sha256, ssl_hash_sha384};
+INSTANTIATE_TEST_CASE_P(AllHashFuncs, TlsHkdfTest,
+                        ::testing::ValuesIn(kHashTypes));
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/tls_parser.cc b/security/nss/gtests/ssl_gtest/tls_parser.cc
new file mode 100644
index 0000000000..e4c06aa910
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_parser.cc
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "tls_parser.h"
+
+namespace nss_test {
+
+bool TlsParser::Read(uint8_t* val) {
+  if (remaining() < 1) {
+    return false;
+  }
+  *val = *ptr();
+  consume(1);
+  return true;
+}
+
+bool TlsParser::Read(uint32_t* val, size_t size) {
+  if (size > sizeof(uint32_t)) {
+    return false;
+  }
+
+  uint32_t v = 0;
+  for (size_t i = 0; i < size; ++i) {
+    uint8_t tmp;
+    if (!Read(&tmp)) {
+      return false;
+    }
+
+    v = (v << 8) | tmp;
+  }
+
+  *val = v;
+  return true;
+}
+
+bool TlsParser::Read(DataBuffer* val, size_t len) {
+  if (remaining() < len) {
+    return false;
+  }
+
+  val->Assign(ptr(), len);
+  consume(len);
+  return true;
+}
+
+bool TlsParser::ReadVariable(DataBuffer* val, size_t len_size) {
+  uint32_t len;
+  if (!Read(&len, len_size)) {
+    return false;
+  }
+  return Read(val, len);
+}
+
+bool TlsParser::Skip(size_t len) {
+  if (len > remaining()) {
+    return false;
+  }
+  consume(len);
+  return true;
+}
+
+bool TlsParser::SkipVariable(size_t len_size) {
+  uint32_t len;
+  if (!Read(&len, len_size)) {
+    return false;
+  }
+  return Skip(len);
+}
+
+}  // namespace nss_test
diff --git a/security/nss/gtests/ssl_gtest/tls_parser.h b/security/nss/gtests/ssl_gtest/tls_parser.h
new file mode 100644
index 0000000000..c79d45a7e8
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/tls_parser.h
@@ -0,0 +1,131 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef tls_parser_h_
+#define tls_parser_h_
+
+#include <cstdint>
+#include <cstring>
+#include <memory>
+#if defined(WIN32) || defined(WIN64)
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+#include "databuffer.h"
+
+namespace nss_test {
+
+const uint8_t kTlsChangeCipherSpecType = 20;
+const uint8_t kTlsAlertType = 21;
+const uint8_t kTlsHandshakeType = 22;
+const uint8_t kTlsApplicationDataType = 23;
+
+const uint8_t kTlsHandshakeClientHello = 1;
+const uint8_t kTlsHandshakeServerHello = 2;
+const uint8_t kTlsHandshakeHelloRetryRequest = 6;
+const uint8_t kTlsHandshakeEncryptedExtensions = 8;
+const uint8_t kTlsHandshakeCertificate = 11;
+const uint8_t kTlsHandshakeServerKeyExchange = 12;
+const uint8_t kTlsHandshakeCertificateVerify = 15;
+const uint8_t kTlsHandshakeClientKeyExchange = 16;
+const uint8_t kTlsHandshakeFinished = 20;
+
+const uint8_t kTlsAlertWarning = 1;
+const uint8_t kTlsAlertFatal = 2;
+
+const uint8_t kTlsAlertUnexpectedMessage = 10;
+const uint8_t kTlsAlertBadRecordMac = 20;
+const uint8_t kTlsAlertHandshakeFailure = 40;
+const uint8_t kTlsAlertIllegalParameter = 47;
+const uint8_t kTlsAlertDecodeError = 50;
+const uint8_t kTlsAlertDecryptError = 51;
+const uint8_t kTlsAlertMissingExtension = 109;
+const uint8_t kTlsAlertUnsupportedExtension = 110;
+const uint8_t kTlsAlertUnrecognizedName = 112;
+const uint8_t kTlsAlertNoApplicationProtocol = 120;
+
+const uint8_t kTlsFakeChangeCipherSpec[] = {
+    kTlsChangeCipherSpecType,  // Type
+    0xfe,
+    0xff,  // Version
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    0x10,  // Fictitious sequence #
+    0x00,
+    0x01,  // Length
+    0x01   // Value
+};
+
+static const uint8_t kTls13PskKe = 0;
+static const uint8_t kTls13PskDhKe = 1;
+static const uint8_t kTls13PskAuth = 0;
+static const uint8_t kTls13PskSignAuth = 1;
+
+inline bool IsDtls(uint16_t version) { return (version & 0x8000) == 0x8000; }
+
+inline uint16_t NormalizeTlsVersion(uint16_t version) {
+  if (version == 0xfeff) {
+    return 0x0302;  // special: DTLS 1.0 == TLS 1.1
+  }
+  if (IsDtls(version)) {
+    return (version ^ 0xffff) + 0x0201;
+  }
+  return version;
+}
+
+inline uint16_t TlsVersionToDtlsVersion(uint16_t version) {
+  if (version == 0x0302) {
+    return 0xfeff;
+  }
+  if (version == 0x0304) {
+    return version;
+  }
+  return 0xffff - version + 0x0201;
+}
+
+inline size_t WriteVariable(DataBuffer* target, size_t index,
+                            const DataBuffer& buf, size_t len_size) {
+  index = target->Write(index, static_cast<uint32_t>(buf.len()), len_size);
+  return target->Write(index, buf.data(), buf.len());
+}
+
+class TlsParser {
+ public:
+  TlsParser(const uint8_t* data, size_t len) : buffer_(data, len), offset_(0) {}
+  explicit TlsParser(const DataBuffer& buf) : buffer_(buf), offset_(0) {}
+
+  bool Read(uint8_t* val);
+  // Read an integral type of specified width.
+  bool Read(uint32_t* val, size_t size);
+  // Reads len bytes into dest buffer, overwriting it.
+  bool Read(DataBuffer* dest, size_t len);
+  // Reads bytes into dest buffer, overwriting it.  The number of bytes is
+  // determined by reading from len_size bytes from the stream first.
+  bool ReadVariable(DataBuffer* dest, size_t len_size);
+
+  bool Skip(size_t len);
+  bool SkipVariable(size_t len_size);
+
+  size_t consumed() const { return offset_; }
+  size_t remaining() const { return buffer_.len() - offset_; }
+
+ private:
+  void consume(size_t len) { offset_ += len; }
+  const uint8_t* ptr() const { return buffer_.data() + offset_; }
+
+  DataBuffer buffer_;
+  size_t offset_;
+};
+
+}  // namespace nss_test
+
+#endif