Ensure the record sequence number gets incremented
We were not incrementing the sequence number every time we sent/received
a record.
@@ -80,6 +80,17 @@ int tls13_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int send)
for (loop = 0; loop < SEQ_NUM_SIZE; loop++)
iv[offset + loop] = staticiv[offset + loop] ^ seq[loop];
+ /* Increment the sequence counter */
+ for (loop = SEQ_NUM_SIZE; loop > 0; loop--) {
+ ++seq[loop - 1];
+ if (seq[loop - 1] != 0)
+ break;
+ }
+ if (loop == 0) {
+ /* Sequence has wrapped */
+ return -1;
+ }
+
/* TODO(size_t): lenu/lenf should be a size_t but EVP doesn't support it */
if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, send) <= 0
|| EVP_CipherUpdate(ctx, rec->data, &lenu, rec->input,
