Commit 5c09dbba authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont

Maintain the SRTCP index

This is not very useful at the moment, but will be needed for proper
replay attack protection
parent 54a46387
......@@ -651,6 +651,7 @@ srtcp_send (srtp_session_t *s, uint8_t *buf, size_t *lenp, size_t bufsize)
const uint8_t *tag = rtcp_digest (s->rtp.mac, buf, len);
memcpy (buf + len, tag, s->tag_len);
*lenp = len + s->tag_len;
s->rtcp_index++; /* Update index */
return 0;
}
......@@ -682,8 +683,13 @@ srtcp_recv (srtp_session_t *s, uint8_t *buf, size_t *lenp)
return EACCES;
len -= 4; /* Remove SRTCP index before decryption */
*lenp = len;
uint32_t index;
memcpy (&index, buf + len, 4);
index = ntohl (index);
if (((index - s->rtcp_index) & 0xffffffff) < 0x80000000)
s->rtcp_index = index; /* Update index */
*lenp = len;
return srtp_crypt (s, buf, len);
}
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