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Check received gcm tag

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This commit is contained in:
Paul Fariello
2019-03-06 21:27:25 +02:20
parent b0c52f84ab
commit da0376a6a9
3 changed files with 18 additions and 7 deletions
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12
src/omemo/omemo.c
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@@ -577,10 +577,20 @@ omemo_on_message_recv(const char *const from, uint32_t sid,
return NULL;
}
if (signal_buffer_len(plaintext_key) != AES128_GCM_KEY_LENGTH + AES128_GCM_TAG_LENGTH) {
log_error("OMEMO: invalid key length");
signal_buffer_free(plaintext_key);
return NULL;
}
size_t plaintext_len = payload_len;
unsigned char *plaintext = malloc(plaintext_len + 1);
res = aes128gcm_decrypt(plaintext, &plaintext_len, payload, payload_len, iv, signal_buffer_data(plaintext_key));
res = aes128gcm_decrypt(plaintext, &plaintext_len, payload, payload_len, iv,
signal_buffer_data(plaintext_key),
signal_buffer_data(plaintext_key) + AES128_GCM_KEY_LENGTH);
if (res != 0) {
log_error("OMEMO: cannot decrypt message: %s", gcry_strerror(res));
signal_buffer_free(plaintext_key);
free(plaintext);
return NULL;
}