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Code

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
View File

@ -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);

2
src/omemo/crypto.h
View File

@ -145,4 +145,4 @@ int aes128gcm_encrypt(unsigned char *ciphertext, size_t *ciphertext_len,
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);
const unsigned char *const key, const unsigned char *const tag);

12
src/omemo/omemo.c
View File

@ -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;
}