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62 lines
1.1 KiB
62 lines
1.1 KiB
#include "rtp.h"
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#include <sys/types.h>
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#include "str.h"
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#include "crypto.h"
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struct rtp_header {
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unsigned char v_p_x_cc;
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unsigned char m_pt;
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u_int16_t seq_num;
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u_int32_t timestamp;
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u_int32_t ssrc;
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u_int32_t csrc[];
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} __attribute__ ((packed));
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static inline int check_session_key(struct crypto_context *c) {
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str s;
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if (c->have_session_key)
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return 0;
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str_init_len(&s, c->session_key, c->crypto_suite->session_key_len);
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if (crypto_gen_session_key(c, &s, 0x00))
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return -1;
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str_init_len(&s, c->session_auth_key, c->crypto_suite->srtp_auth_key_len);
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if (crypto_gen_session_key(c, &s, 0x01))
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return -1;
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str_init_len(&s, c->session_salt, c->crypto_suite->session_salt_len);
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if (crypto_gen_session_key(c, &s, 0x02))
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return -1;
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c->have_session_key = 1;
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return 0;
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}
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/* XXX some error handling/logging here */
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int rtp_avp2savp(str *s, struct crypto_context *c) {
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struct rtp_header *rtp;
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if (s->len < sizeof(*rtp))
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return -1;
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rtp = (void *) s->s;
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if (check_session_key(c))
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return -1;
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return 0;
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}
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int rtp_savp2avp(str *s, struct crypto_context *c) {
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if (check_session_key(c))
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return -1;
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return 0;
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}
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