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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 _MIMEMSIG_H_
+#define _MIMEMSIG_H_
+
+#include "mimemult.h"
+#include "mimepbuf.h"
+#include "modmimee.h"
+
+/* The MimeMultipartSigned class implements the multipart/signed MIME
+ container, which provides a general method of associating a cryptographic
+ signature to an arbitrary MIME object.
+
+ The MimeMultipartSigned class provides the following methods:
+
+ void *crypto_init (MimeObject *multipart_object)
+
+ This is called with the object, the object->headers of which should be
+ used to initialize the dexlateion engine. NULL indicates failure;
+ otherwise, an opaque closure object should be returned.
+
+ int crypto_data_hash (const char *data, int32_t data_size,
+ void *crypto_closure)
+
+ This is called with the raw data, for which a signature has been computed.
+ The crypto module should examine this, and compute a signature for it.
+
+ int crypto_data_eof (void *crypto_closure, bool abort_p)
+
+ This is called when no more data remains. If `abort_p' is true, then the
+ crypto module may choose to discard any data rather than processing it,
+ as we're terminating abnormally.
+
+ int crypto_signature_init (void *crypto_closure,
+ MimeObject *multipart_object,
+ MimeHeaders *signature_hdrs)
+
+ This is called after crypto_data_eof() and just before the first call to
+ crypto_signature_hash(). The crypto module may wish to do some
+ initialization here, or may wish to examine the actual headers of the
+ signature object itself.
+
+ int crypto_signature_hash (const char *data, int32_t data_size,
+ void *crypto_closure)
+
+ This is called with the raw data of the detached signature block. It will
+ be called after crypto_data_eof() has been called to signify the end of
+ the data which is signed. This data is the data of the signature itself.
+
+ int crypto_signature_eof (void *crypto_closure, bool abort_p)
+
+ This is called when no more signature data remains. If `abort_p' is true,
+ then the crypto module may choose to discard any data rather than
+ processing it, as we're terminating abnormally.
+
+ char * crypto_generate_html (void *crypto_closure)
+
+ This is called after `crypto_signature_eof' but before `crypto_free'.
+ The crypto module should return a newly-allocated string of HTML code
+ which explains the status of the dexlateion to the user (whether the
+ signature checks out, etc.)
+
+ void crypto_free (void *crypto_closure)
+
+ This will be called when we're all done, after `crypto_signature_eof' and
+ `crypto_emit_html'. It is intended to free any data represented by the
+ crypto_closure.
+ */
+
+typedef struct MimeMultipartSignedClass MimeMultipartSignedClass;
+typedef struct MimeMultipartSigned MimeMultipartSigned;
+
+typedef enum {
+ MimeMultipartSignedPreamble,
+ MimeMultipartSignedBodyFirstHeader,
+ MimeMultipartSignedBodyHeaders,
+ MimeMultipartSignedBodyFirstLine,
+ MimeMultipartSignedBodyLine,
+ MimeMultipartSignedSignatureHeaders,
+ MimeMultipartSignedSignatureFirstLine,
+ MimeMultipartSignedSignatureLine,
+ MimeMultipartSignedEpilogue
+} MimeMultipartSignedParseState;
+
+struct MimeMultipartSignedClass {
+ MimeMultipartClass multipart;
+
+ /* Callbacks used by dexlateion (really, signature verification) module. */
+ void * (*crypto_init) (MimeObject *multipart_object);
+
+ int (*crypto_data_hash) (const char *data, int32_t data_size,
+ void *crypto_closure);
+ int (*crypto_signature_hash) (const char *data, int32_t data_size,
+ void *crypto_closure);
+
+ int (*crypto_data_eof) (void *crypto_closure, bool abort_p);
+ int (*crypto_signature_eof) (void *crypto_closure, bool abort_p);
+
+ int (*crypto_signature_init) (void *crypto_closure,
+ MimeObject *multipart_object,
+ MimeHeaders *signature_hdrs);
+
+ char * (*crypto_generate_html) (void *crypto_closure);
+
+ void (*crypto_free) (void *crypto_closure);
+};
+
+extern "C" MimeMultipartSignedClass mimeMultipartSignedClass;
+
+struct MimeMultipartSigned {
+ MimeMultipart multipart;
+ MimeMultipartSignedParseState state; /* State of parser */
+
+ void *crypto_closure; /* Opaque data used by signature
+ verification module. */
+
+ MimeHeaders *body_hdrs; /* The headers of the signed object. */
+ MimeHeaders *sig_hdrs; /* The headers of the signature. */
+
+ MimePartBufferData *part_buffer; /* The buffered body of the signed
+ object (see mimepbuf.h) */
+
+ MimeDecoderData *sig_decoder_data; /* The signature is probably base64
+ encoded; this is the decoder used
+ to get raw bits out of it. */
+};
+
+#define MimeMultipartSignedClassInitializer(ITYPE,CSUPER) \
+ { MimeMultipartClassInitializer(ITYPE,CSUPER) }
+
+#endif /* _MIMEMSIG_H_ */