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Update DTLS code to match CBC decoding in TLS.

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This change updates the DTLS code to match the constant-time CBC
behaviour in the TLS.
(cherry picked from commit 9f27de170d)
This commit is contained in:
Ben Laurie
2013-01-28 17:34:33 +00:00
committed by Dr. Stephen Henson
parent 610dfc3ef4
commit b23da2919b
5 changed files with 68 additions and 58 deletions
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17
ssl/s3_pkt.c
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@@ -290,7 +290,6 @@ static int ssl3_get_record(SSL *s)
unsigned char md[EVP_MAX_MD_SIZE];
short version;
unsigned mac_size;
int clear=0;
size_t extra;
rr= &(s->s3->rrec);
@@ -407,8 +406,9 @@ fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
* -1: if the padding is invalid */
if (enc_err == 0)
{
/* SSLerr() and ssl3_send_alert() have been called */
goto err;
al=SSL_AD_DECRYPTION_FAILED;
SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
goto f_err;
}
#ifdef TLS_DEBUG
@@ -418,14 +418,11 @@ printf("\n");
#endif
/* r->length is now the compressed data plus mac */
if ( (sess == NULL) ||
(s->enc_read_ctx == NULL) ||
(EVP_MD_CTX_md(s->read_hash) == NULL))
clear=1;
if (!clear)
if ((sess != NULL) &&
(s->enc_read_ctx != NULL) &&
(EVP_MD_CTX_md(s->read_hash) != NULL))
{
/* !clear => s->read_hash != NULL => mac_size != -1 */
/* s->read_hash != NULL => mac_size != -1 */
unsigned char *mac = NULL;
unsigned char mac_tmp[EVP_MAX_MD_SIZE];
mac_size=EVP_MD_CTX_size(s->read_hash);