Update libsrtp to version 2.0

include/srtp_priv.h

+/*
+ * srtp_priv.h
+ *
+ * private internal data structures and functions for libSRTP
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+/*
+ *      
+ * Copyright (c) 2001-2006 Cisco Systems, Inc.
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ *   Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ * 
+ *   Neither the name of the Cisco Systems, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef SRTP_PRIV_H
+#define SRTP_PRIV_H
+
+#include "config.h"
+#include "srtp.h"
+#include "rdbx.h"
+#include "rdb.h"
+#include "integers.h"
+#include "cipher.h"
+#include "auth.h"
+#include "aes.h"
+#include "key.h"
+#include "crypto_kernel.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SRTP_VER_STRING     PACKAGE_STRING
+#define SRTP_VERSION        PACKAGE_VERSION
+
+/*
+ * the following declarations are libSRTP internal functions 
+ */
+
+/*
+ * srtp_get_stream(ssrc) returns a pointer to the stream corresponding
+ * to ssrc, or NULL if no stream exists for that ssrc
+ */
+srtp_stream_t srtp_get_stream(srtp_t srtp, uint32_t ssrc);
+
+
+/*
+ * srtp_stream_init_keys(s, k) (re)initializes the srtp_stream_t s by
+ * deriving all of the needed keys using the KDF and the key k.
+ */
+srtp_err_status_t srtp_stream_init_keys(srtp_stream_t srtp, const void *key);
+
+/*
+ * srtp_stream_init(s, p) initializes the srtp_stream_t s to 
+ * use the policy at the location p
+ */
+srtp_err_status_t srtp_stream_init(srtp_stream_t srtp, const srtp_policy_t *p);
+
+
+/*
+ * libsrtp internal datatypes 
+ */
+
+typedef enum direction_t { 
+  dir_unknown       = 0,
+  dir_srtp_sender   = 1, 
+  dir_srtp_receiver = 2
+} direction_t;
+
+/* 
+ * an srtp_stream_t has its own SSRC, encryption key, authentication
+ * key, sequence number, and replay database
+ * 
+ * note that the keys might not actually be unique, in which case the
+ * srtp_cipher_t and srtp_auth_t pointers will point to the same structures
+ */
+
+typedef struct srtp_stream_ctx_t_ {
+  uint32_t   ssrc;
+  srtp_cipher_t  *rtp_cipher;
+  srtp_cipher_t  *rtp_xtn_hdr_cipher;
+  srtp_auth_t    *rtp_auth;
+  srtp_rdbx_t     rtp_rdbx;
+  srtp_sec_serv_t rtp_services;
+  srtp_cipher_t  *rtcp_cipher;
+  srtp_auth_t    *rtcp_auth;
+  srtp_rdb_t      rtcp_rdb;
+  srtp_sec_serv_t rtcp_services;
+  srtp_key_limit_ctx_t *limit;
+  direction_t direction;
+  int        allow_repeat_tx;
+  srtp_ekt_stream_t ekt; 
+  uint8_t    salt[SRTP_AEAD_SALT_LEN];   /* used with GCM mode for SRTP */
+  uint8_t    c_salt[SRTP_AEAD_SALT_LEN]; /* used with GCM mode for SRTCP */
+  int       *enc_xtn_hdr;
+  int        enc_xtn_hdr_count;
+  struct srtp_stream_ctx_t_ *next;   /* linked list of streams */
+} strp_stream_ctx_t_;
+
+
+/*
+ * an srtp_ctx_t holds a stream list and a service description
+ */
+
+typedef struct srtp_ctx_t_ {
+  struct srtp_stream_ctx_t_ *stream_list;     /* linked list of streams            */
+  struct srtp_stream_ctx_t_ *stream_template; /* act as template for other streams */
+  void *user_data;                    /* user custom data */
+} srtp_ctx_t_;
+
+
+
+/*
+ * srtp_handle_event(srtp, srtm, evnt) calls the event handling
+ * function, if there is one.
+ *
+ * This macro is not included in the documentation as it is 
+ * an internal-only function.
+ */
+
+#define srtp_handle_event(srtp, strm, evnt)         \
+   if(srtp_event_handler) {                         \
+      srtp_event_data_t data;                       \
+      data.session = srtp;                          \
+      data.stream  = strm;                          \
+      data.event   = evnt;                          \
+      srtp_event_handler(&data);                    \
+}   
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SRTP_PRIV_H */