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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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11
src/omemo/crypto.c
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@@ -295,7 +295,7 @@ out:
}
int
aes128gcm_decrypt(unsigned char *plaintext, size_t *plaintext_len, const unsigned char *const ciphertext, size_t ciphertext_len, const unsigned char *const iv, const unsigned char *const key)
aes128gcm_decrypt(unsigned char *plaintext, size_t *plaintext_len, const unsigned char *const ciphertext, size_t ciphertext_len, const unsigned char *const iv, const unsigned char *const key, const unsigned char *const tag)
{
gcry_error_t res;
gcry_cipher_hd_t hd;
@@ -319,10 +319,11 @@ aes128gcm_decrypt(unsigned char *plaintext, size_t *plaintext_len, const unsigne
if (res != GPG_ERR_NO_ERROR) {
goto out;
}
//res = gcry_cipher_checktag(hd, ciphertext + ciphertext_len - AES128_GCM_TAG_LENGTH, AES128_GCM_TAG_LENGTH);
//if (res != GPG_ERR_NO_ERROR) {
// goto out;
//}
res = gcry_cipher_checktag(hd, tag, AES128_GCM_TAG_LENGTH);
if (res != GPG_ERR_NO_ERROR) {
goto out;
}
out:
gcry_cipher_close(hd);