libs/srtp/srtp.h

   1 /*
   2  * Secure RTP with libgcrypt
   3  * Copyright (C) 2007  Rémi Denis-Courmont <rdenis # simphalempin , com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifndef LIBVLC_SRTP_H
  21 # define LIBVLC_SRTP_H 1
  22
  23 typedef struct srtp_session_t srtp_session_t;
  24
  25 enum
  26 {
  27     SRTP_UNENCRYPTED=0x1,   // do not encrypt SRTP packets
  28     SRTCP_UNENCRYPTED=0x2,  // do not encrypt SRTCP packets
  29     SRTP_UNAUTHENTICATED=0x4, // authenticate only SRTCP packets
  30
  31     SRTP_RCC_MODE1=0x10,    // use Roll-over-Counter Carry mode 1
  32     SRTP_RCC_MODE2=0x20,    // use Roll-over-Counter Carry mode 2
  33     SRTP_RCC_MODE3=0x30,    // use Roll-over-Counter Carry mode 3 (insecure)
  34
  35     SRTP_FLAGS_MASK=0x38
  36 };
  37
  38 /* SRTP encryption algorithms (ciphers); same values as MIKEY */
  39 enum
  40 {
  41     SRTP_ENCR_NULL=0,
  42     SRTP_ENCR_AES_CM=1,
  43     SRTP_ENCR_AES_F8=2 // not implemented
  44 };
  45
  46 /* SRTP authenticaton algorithms; same values as MIKEY */
  47 enum
  48 {
  49     SRTP_AUTH_NULL=0,
  50     SRTP_AUTH_HMAC_SHA1=1
  51 };
  52
  53 /* SRTP pseudo random function; same values as MIKEY */
  54 enum
  55 {
  56     SRTP_PRF_AES_CM=0
  57 };
  58
  59 # ifdef __cplusplus
  60 extern "C" {
  61 # endif
  62
  63 srtp_session_t *srtp_create (int encr, int auth, unsigned tag_len, int prf,
  64                              unsigned flags);
  65 void srtp_destroy (srtp_session_t *s);
  66
  67 int srtp_setkey (srtp_session_t *s, const void *key, size_t keylen,
  68                  const void *salt, size_t saltlen);
  69 void srtp_setrcc_rate (srtp_session_t *s, uint16_t rate);
  70
  71 int srtp_send (srtp_session_t *s, uint8_t *buf, size_t *lenp, size_t maxsize);
  72 int srtp_recv (srtp_session_t *s, uint8_t *buf, size_t *lenp);
  73 int srtcp_send (srtp_session_t *s, uint8_t *buf, size_t *lenp, size_t maxsiz);
  74 int srtcp_recv (srtp_session_t *s, uint8_t *buf, size_t *lenp);
  75
  76 # ifdef __cplusplus
  77 }
  78 # endif
  79 #endif
  80