Support for pickling inbound group sessions
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2 changed files with 108 additions and 1 deletions
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@ -22,8 +22,12 @@
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#include "olm/error.h"
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#include "olm/megolm.h"
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#include "olm/message.h"
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#include "olm/pickle.h"
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#include "olm/pickle_encoding.h"
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#define OLM_PROTOCOL_VERSION 3
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#define PICKLE_VERSION 1
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struct OlmInboundGroupSession {
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/** our earliest known ratchet value */
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@ -86,6 +90,78 @@ size_t olm_init_inbound_group_session(
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return 0;
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}
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static size_t raw_pickle_length(
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const OlmInboundGroupSession *session
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) {
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size_t length = 0;
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length += _olm_pickle_uint32_length(PICKLE_VERSION);
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length += megolm_pickle_length(&session->initial_ratchet);
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length += megolm_pickle_length(&session->latest_ratchet);
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return length;
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}
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size_t olm_pickle_inbound_group_session_length(
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const OlmInboundGroupSession *session
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) {
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return _olm_enc_output_length(raw_pickle_length(session));
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}
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size_t olm_pickle_inbound_group_session(
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OlmInboundGroupSession *session,
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void const * key, size_t key_length,
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void * pickled, size_t pickled_length
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) {
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size_t raw_length = raw_pickle_length(session);
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uint8_t *pos;
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if (pickled_length < _olm_enc_output_length(raw_length)) {
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session->last_error = OLM_OUTPUT_BUFFER_TOO_SMALL;
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return (size_t)-1;
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}
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pos = _olm_enc_output_pos(pickled, raw_length);
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pos = _olm_pickle_uint32(pos, PICKLE_VERSION);
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pos = megolm_pickle(&session->initial_ratchet, pos);
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pos = megolm_pickle(&session->latest_ratchet, pos);
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return _olm_enc_output(key, key_length, pickled, raw_length);
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}
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size_t olm_unpickle_inbound_group_session(
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OlmInboundGroupSession *session,
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void const * key, size_t key_length,
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void * pickled, size_t pickled_length
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) {
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const uint8_t *pos;
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const uint8_t *end;
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uint32_t pickle_version;
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size_t raw_length = _olm_enc_input(
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key, key_length, pickled, pickled_length, &(session->last_error)
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);
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if (raw_length == (size_t)-1) {
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return raw_length;
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}
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pos = pickled;
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end = pos + raw_length;
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pos = _olm_unpickle_uint32(pos, end, &pickle_version);
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if (pickle_version != PICKLE_VERSION) {
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session->last_error = OLM_UNKNOWN_PICKLE_VERSION;
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return (size_t)-1;
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}
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pos = megolm_unpickle(&session->initial_ratchet, pos, end);
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pos = megolm_unpickle(&session->latest_ratchet, pos, end);
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if (end != pos) {
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/* We had the wrong number of bytes in the input. */
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session->last_error = OLM_CORRUPTED_PICKLE;
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return (size_t)-1;
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}
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return pickled_length;
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}
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size_t olm_group_decrypt_max_plaintext_length(
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OlmInboundGroupSession *session,
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uint8_t * message, size_t message_length
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@ -20,7 +20,7 @@
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int main() {
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{
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TestCase test_case("Pickle outbound group");
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TestCase test_case("Pickle outbound group session");
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size_t size = olm_outbound_group_session_size();
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uint8_t memory[size];
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@ -50,6 +50,37 @@ int main() {
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}
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{
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TestCase test_case("Pickle inbound group session");
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size_t size = olm_inbound_group_session_size();
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uint8_t memory[size];
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OlmInboundGroupSession *session = olm_inbound_group_session(memory);
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size_t pickle_length = olm_pickle_inbound_group_session_length(session);
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uint8_t pickle1[pickle_length];
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olm_pickle_inbound_group_session(session,
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"secret_key", 10,
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pickle1, pickle_length);
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uint8_t pickle2[pickle_length];
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memcpy(pickle2, pickle1, pickle_length);
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uint8_t buffer2[size];
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OlmInboundGroupSession *session2 = olm_inbound_group_session(buffer2);
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size_t res = olm_unpickle_inbound_group_session(session2,
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"secret_key", 10,
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pickle2, pickle_length);
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assert_not_equals((size_t)-1, res);
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assert_equals(pickle_length,
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olm_pickle_inbound_group_session_length(session2));
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olm_pickle_inbound_group_session(session2,
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"secret_key", 10,
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pickle2, pickle_length);
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assert_equals(pickle1, pickle2, pickle_length);
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}
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{
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TestCase test_case("Group message send/receive");
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