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/**
* @file /srtp/sdes.c SDP Security Descriptions for Media Streams (RFC 4568)
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
#include "sdes.h"
const char sdp_attr_crypto[] = "crypto";
int sdes_encode_crypto(struct sdp_media *m, uint32_t tag, const char *suite,
const char *key, size_t key_len)
{
return sdp_media_set_lattr(m, true, sdp_attr_crypto, "%u %s inline:%b",
tag, suite, key, key_len);
}
/* http://tools.ietf.org/html/rfc4568
* a=crypto:<tag> <crypto-suite> <key-params> [<session-params>]
*/
int sdes_decode_crypto(struct crypto *c, const char *val)
{
struct pl tag, key_prms;
int err;
err = re_regex(val, str_len(val), "[0-9]+ [^ ]+ [^ ]+[]*[^]*",
&tag, &c->suite, &key_prms, NULL, &c->sess_prms);
if (err)
return err;
c->tag = pl_u32(&tag);
c->lifetime = c->mki = pl_null;
err = re_regex(key_prms.p, key_prms.l, "[^:]+:[^|]+[|]*[^|]*[|]*[^|]*",
&c->key_method, &c->key_info,
NULL, &c->lifetime, NULL, &c->mki);
if (err)
return err;
return 0;
}
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