Return the message index when decrypting group messages.
Applications can use the index to detect replays of the same message.
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6ea9fb450e
commit
653790eacb
7 changed files with 31 additions and 14 deletions
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@ -140,7 +140,8 @@ size_t olm_group_decrypt(
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uint8_t * message, size_t message_length,
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/* output */
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uint8_t * plaintext, size_t max_plaintext_length
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uint8_t * plaintext, size_t max_plaintext_length,
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uint32_t * message_index
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);
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@ -403,8 +403,8 @@ DemoUser.prototype.decryptGroup = function(jsonpacket, callback) {
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throw new Error("Unknown session id " + session_id);
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}
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var plaintext = session.decrypt(packet.body);
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done(plaintext);
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var result = session.decrypt(packet.body);
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done(result.plaintext);
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}, callback);
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};
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@ -73,10 +73,12 @@ InboundGroupSession.prototype['decrypt'] = restore_stack(function(
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// So we copy the array to a new buffer
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var message_buffer = stack(message_array);
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var plaintext_buffer = stack(max_plaintext_length + NULL_BYTE_PADDING_LENGTH);
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var message_index = stack(4);
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var plaintext_length = inbound_group_session_method(Module["_olm_group_decrypt"])(
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this.ptr,
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message_buffer, message_array.length,
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plaintext_buffer, max_plaintext_length
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plaintext_buffer, max_plaintext_length,
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message_index
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);
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// Pointer_stringify requires a null-terminated argument (the optional
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@ -86,7 +88,10 @@ InboundGroupSession.prototype['decrypt'] = restore_stack(function(
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0, "i8"
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);
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return Pointer_stringify(plaintext_buffer);
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return {
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"plaintext": Pointer_stringify(plaintext_buffer),
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"message_index": Module['getValue'](message_index, "i32")
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}
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});
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InboundGroupSession.prototype['session_id'] = restore_stack(function() {
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@ -328,7 +328,7 @@ def do_group_decrypt(args):
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session = InboundGroupSession()
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session.unpickle(args.key, read_base64_file(args.session_file))
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message = args.message_file.read()
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plaintext = session.decrypt(message)
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plaintext, message_index = session.decrypt(message)
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with open(args.session_file, "wb") as f:
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f.write(session.pickle(args.key))
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args.plaintext_file.write(plaintext)
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@ -43,6 +43,7 @@ inbound_group_session_function(
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lib.olm_group_decrypt,
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c_void_p, c_size_t, # message
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c_void_p, c_size_t, # plaintext
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POINTER(c_uint32), # message_index
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)
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inbound_group_session_function(lib.olm_inbound_group_session_id_length)
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@ -82,11 +83,14 @@ class InboundGroupSession(object):
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)
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plaintext_buffer = create_string_buffer(max_plaintext_length)
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message_buffer = create_string_buffer(message)
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message_index = c_uint32()
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plaintext_length = lib.olm_group_decrypt(
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self.ptr, message_buffer, len(message),
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plaintext_buffer, max_plaintext_length
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plaintext_buffer, max_plaintext_length,
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byref(message_index)
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)
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return plaintext_buffer.raw[:plaintext_length]
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return plaintext_buffer.raw[:plaintext_length], message_index
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def session_id(self):
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id_length = lib.olm_inbound_group_session_id_length(self.ptr)
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@ -263,7 +263,8 @@ size_t olm_group_decrypt_max_plaintext_length(
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static size_t _decrypt(
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OlmInboundGroupSession *session,
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uint8_t * message, size_t message_length,
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uint8_t * plaintext, size_t max_plaintext_length
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uint8_t * plaintext, size_t max_plaintext_length,
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uint32_t * message_index
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) {
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struct _OlmDecodeGroupMessageResults decoded_results;
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size_t max_length, r;
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@ -286,6 +287,8 @@ static size_t _decrypt(
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return (size_t)-1;
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}
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*message_index = decoded_results.message_index;
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/* verify the signature. We could do this before decoding the message, but
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* we allow for the possibility of future protocol versions which use a
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* different signing mechanism; we would rather throw "BAD_MESSAGE_VERSION"
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@ -349,7 +352,8 @@ static size_t _decrypt(
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size_t olm_group_decrypt(
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OlmInboundGroupSession *session,
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uint8_t * message, size_t message_length,
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uint8_t * plaintext, size_t max_plaintext_length
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uint8_t * plaintext, size_t max_plaintext_length,
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uint32_t * message_index
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) {
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size_t raw_message_length;
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@ -361,7 +365,8 @@ size_t olm_group_decrypt(
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return _decrypt(
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session, message, raw_message_length,
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plaintext, max_plaintext_length
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plaintext, max_plaintext_length,
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message_index
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);
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}
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@ -161,8 +161,9 @@ int main() {
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memcpy(msgcopy, msg, msglen);
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size = olm_group_decrypt_max_plaintext_length(inbound_session, msgcopy, msglen);
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uint8_t plaintext_buf[size];
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uint32_t message_index;
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res = olm_group_decrypt(inbound_session, msg, msglen,
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plaintext_buf, size);
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plaintext_buf, size, &message_index);
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assert_equals(plaintext_length, res);
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assert_equals(plaintext, plaintext_buf, res);
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}
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@ -208,8 +209,9 @@ int main() {
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memcpy(msgcopy, message, msglen);
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uint8_t plaintext_buf[size];
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uint32_t message_index;
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res = olm_group_decrypt(
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inbound_session, msgcopy, msglen, plaintext_buf, size
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inbound_session, msgcopy, msglen, plaintext_buf, size, &message_index
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);
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assert_equals(plaintext_length, res);
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assert_equals(plaintext, plaintext_buf, res);
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@ -227,7 +229,7 @@ int main() {
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memcpy(msgcopy, message, msglen);
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res = olm_group_decrypt(
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inbound_session, msgcopy, msglen,
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plaintext_buf, size
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plaintext_buf, size, &message_index
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);
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assert_equals((size_t)-1, res);
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assert_equals(
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