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diff --git a/comm/mailnews/mime/src/mimemsig.h b/comm/mailnews/mime/src/mimemsig.h
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+++ b/comm/mailnews/mime/src/mimemsig.h
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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_notify_suppressed_child)(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_ */