Merge remote-tracking branch 'matrix/master'

3 files changed, 4 insertions, 21 deletions

diff --git a/src/inbound_group_session.c b/src/inbound_group_session.c
index e171205..ce26033 100644
--- a/src/inbound_group_session.c
+++ b/src/inbound_group_session.c
@@ -231,9 +231,7 @@ static size_t _decrypt(
         return (size_t)-1;
     }
 
-    if (!decoded_results.has_message_index || !decoded_results.session_id
-        || !decoded_results.ciphertext
-    ) {
+    if (!decoded_results.has_message_index || !decoded_results.ciphertext ) {
         session->last_error = OLM_BAD_MESSAGE_FORMAT;
         return (size_t)-1;
     }
diff --git a/src/message.cpp b/src/message.cpp
index 2e841e5..ad26cb9 100644
--- a/src/message.cpp
+++ b/src/message.cpp
@@ -328,18 +328,15 @@ void olm::decode_one_time_key_message(
 
 
 
-static const std::uint8_t GROUP_SESSION_ID_TAG = 012;
-static const std::uint8_t GROUP_MESSAGE_INDEX_TAG = 020;
-static const std::uint8_t GROUP_CIPHERTEXT_TAG = 032;
+static const std::uint8_t GROUP_MESSAGE_INDEX_TAG = 010;
+static const std::uint8_t GROUP_CIPHERTEXT_TAG = 022;
 
 size_t _olm_encode_group_message_length(
-    size_t group_session_id_length,
     uint32_t message_index,
     size_t ciphertext_length,
     size_t mac_length
 ) {
     size_t length = VERSION_LENGTH;
-    length += 1 + varstring_length(group_session_id_length);
     length += 1 + varint_length(message_index);
     length += 1 + varstring_length(ciphertext_length);
     length += mac_length;
@@ -349,19 +346,14 @@ size_t _olm_encode_group_message_length(
 
 size_t _olm_encode_group_message(
     uint8_t version,
-    const uint8_t *session_id,
-    size_t session_id_length,
     uint32_t message_index,
     size_t ciphertext_length,
     uint8_t *output,
     uint8_t **ciphertext_ptr
 ) {
     std::uint8_t * pos = output;
-    std::uint8_t * session_id_pos;
 
     *(pos++) = version;
-    pos = encode(pos, GROUP_SESSION_ID_TAG, session_id_pos, session_id_length);
-    std::memcpy(session_id_pos, session_id, session_id_length);
     pos = encode(pos, GROUP_MESSAGE_INDEX_TAG, message_index);
     pos = encode(pos, GROUP_CIPHERTEXT_TAG, *ciphertext_ptr, ciphertext_length);
     return pos-output;
@@ -376,8 +368,6 @@ void _olm_decode_group_message(
     std::uint8_t const * end = input + input_length - mac_length;
     std::uint8_t const * unknown = nullptr;
 
-    results->session_id = nullptr;
-    results->session_id_length = 0;
     bool has_message_index = false;
     results->message_index = 0;
     results->ciphertext = nullptr;
@@ -389,10 +379,6 @@ void _olm_decode_group_message(
 
     while (pos != end) {
         pos = decode(
-            pos, end, GROUP_SESSION_ID_TAG,
-            results->session_id, results->session_id_length
-        );
-        pos = decode(
             pos, end, GROUP_MESSAGE_INDEX_TAG,
             results->message_index, has_message_index
         );
diff --git a/src/outbound_group_session.c b/src/outbound_group_session.c
index 9b2298a..2a6c220 100644
--- a/src/outbound_group_session.c
+++ b/src/outbound_group_session.c
@@ -187,7 +187,7 @@ static size_t raw_message_length(
     mac_length = megolm_cipher->ops->mac_length(megolm_cipher);
 
     return _olm_encode_group_message_length(
-        GROUP_SESSION_ID_LENGTH, session->ratchet.counter,
+        session->ratchet.counter,
         ciphertext_length, mac_length);
 }
 
@@ -220,7 +220,6 @@ static size_t _encrypt(
      */
     message_length = _olm_encode_group_message(
         OLM_PROTOCOL_VERSION,
-        session->session_id, GROUP_SESSION_ID_LENGTH,
         session->ratchet.counter,
         ciphertext_length,
         buffer,