int fingerprint_generator_create_display_string(fingerprint_generator *generator, char **display_string, const char *stable_identifier, ec_public_key *identity_key) { int result = 0; char *result_string = 0; signal_buffer *identity_buffer = 0; signal_buffer *hash_buffer = 0; signal_buffer *hash_in_buffer = 0; signal_buffer *hash_out_buffer = 0; uint8_t *data = 0; size_t len = 0; uint8_t *in_data = 0; size_t in_len = 0; int i = 0; assert(generator); assert(stable_identifier); assert(identity_key); assert(generator->global_context->crypto_provider.sha512_digest_func); result = ec_public_key_serialize(&identity_buffer, identity_key); if(result < 0) { goto complete; } len = 2 + signal_buffer_len(identity_buffer) + strlen(stable_identifier); hash_buffer = signal_buffer_alloc(len); if(!hash_buffer) { result = SG_ERR_NOMEM; goto complete; } data = signal_buffer_data(hash_buffer); memset(data, 0, len); data[0] = 0; data[1] = (uint8_t)VERSION; memcpy(data + 2, signal_buffer_data(identity_buffer), signal_buffer_len(identity_buffer)); memcpy(data + 2 + signal_buffer_len(identity_buffer), stable_identifier, strlen(stable_identifier)); hash_in_buffer = signal_buffer_alloc(MAX(len, SHA512_DIGEST_LENGTH) + signal_buffer_len(identity_buffer)); if(!hash_in_buffer) { result = SG_ERR_NOMEM; goto complete; } in_data = signal_buffer_data(hash_in_buffer); in_len = len + signal_buffer_len(identity_buffer); for(i = 0; i < generator->iterations; i++) { data = signal_buffer_data(hash_buffer); len = signal_buffer_len(hash_buffer); in_len = signal_buffer_len(hash_buffer) + signal_buffer_len(identity_buffer); memcpy(in_data, data, len); memcpy(in_data + len, signal_buffer_data(identity_buffer), signal_buffer_len(identity_buffer)); result = signal_sha512_digest(generator->global_context, &hash_out_buffer, in_data, in_len); if(result < 0) { goto complete; } if(signal_buffer_len(hash_out_buffer) != SHA512_DIGEST_LENGTH) { result = SG_ERR_INVAL; goto complete; } signal_buffer_free(hash_buffer); hash_buffer = hash_out_buffer; hash_out_buffer = 0; } data = signal_buffer_data(hash_buffer); len = signal_buffer_len(hash_buffer); if(len < 30) { result = SG_ERR_UNKNOWN; goto complete; } result_string = malloc(31); if(!result_string) { result = SG_ERR_NOMEM; goto complete; } for(i = 0; i < 30; i += 5) { uint64_t chunk = ((uint64_t)data[i] & 0xFFL) << 32 | ((uint64_t)data[i + 1] & 0xFFL) << 24 | ((uint64_t)data[i + 2] & 0xFFL) << 16 | ((uint64_t)data[i + 3] & 0xFFL) << 8 | ((uint64_t)data[i + 4] & 0xFFL); #if _WINDOWS sprintf_s(result_string + i, 6, "%05d", (int)(chunk % 100000)); #else snprintf(result_string + i, 6, "%05d", (int)(chunk % 100000)); #endif } complete: signal_buffer_free(identity_buffer); signal_buffer_free(hash_buffer); signal_buffer_free(hash_in_buffer); signal_buffer_free(hash_out_buffer); if(result >= 0) { *display_string = result_string; } return result; }
int device_consistency_commitment_create(device_consistency_commitment **commitment, uint32_t generation, ec_public_key_list *identity_key_list, signal_context *global_context) { static const char version[] = "DeviceConsistencyCommitment_V0"; int result = 0; void *digest_context = 0; device_consistency_commitment *result_commitment = 0; ec_public_key_list *sorted_list = 0; uint8_t gen_data[4]; unsigned int list_size; unsigned int i; result_commitment = malloc(sizeof(device_consistency_commitment)); if(!result_commitment) { result = SG_ERR_NOMEM; goto complete; } memset(result_commitment, 0, sizeof(device_consistency_commitment)); SIGNAL_INIT(result_commitment, device_consistency_commitment_destroy); sorted_list = ec_public_key_list_copy(identity_key_list); if(!sorted_list) { result = SG_ERR_NOMEM; goto complete; } ec_public_key_list_sort(sorted_list); result = signal_sha512_digest_init(global_context, &digest_context); if(result < 0) { goto complete; } result = signal_sha512_digest_update(global_context, digest_context, (uint8_t *)version, sizeof(version) - 1); if(result < 0) { goto complete; } gen_data[3] = (uint8_t)(generation); gen_data[2] = (uint8_t)(generation >> 8); gen_data[1] = (uint8_t)(generation >> 16); gen_data[0] = (uint8_t)(generation >> 24); result = signal_sha512_digest_update(global_context, digest_context, gen_data, sizeof(gen_data)); if(result < 0) { goto complete; } list_size = ec_public_key_list_size(sorted_list); for(i = 0; i < list_size; i++) { signal_buffer *key_buffer = 0; ec_public_key *key = ec_public_key_list_at(sorted_list, i); result = ec_public_key_serialize(&key_buffer, key); if(result < 0) { goto complete; } result = signal_sha512_digest_update(global_context, digest_context, signal_buffer_data(key_buffer), signal_buffer_len(key_buffer)); signal_buffer_free(key_buffer); if(result < 0) { goto complete; } } result_commitment->generation = generation; result = signal_sha512_digest_final(global_context, digest_context, &result_commitment->serialized); complete: if(sorted_list) { ec_public_key_list_free(sorted_list); } if(digest_context) { signal_sha512_digest_cleanup(global_context, digest_context); } if(result >= 0) { *commitment = result_commitment; } else { SIGNAL_UNREF(result_commitment); } return result; }