Update libsrtp to version 2.0

crypto/include/key.h

 /*
  * key.h
  *
  * key usage limits enforcement
- * 
+ *
  * 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 KEY_H
 #define KEY_H
 
-#include "rdbx.h"   /* for xtd_seq_num_t */
+#include "rdbx.h"   /* for srtp_xtd_seq_num_t */
 #include "err.h"
 
-typedef struct key_limit_ctx_t *key_limit_t;
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct srtp_key_limit_ctx_t *srtp_key_limit_t;
 
 typedef enum {
-   key_event_normal,
-   key_event_soft_limit,
-   key_event_hard_limit
-} key_event_t;
+    srtp_key_event_normal,
+    srtp_key_event_soft_limit,
+    srtp_key_event_hard_limit
+} srtp_key_event_t;
 
-err_status_t
-key_limit_set(key_limit_t key, const xtd_seq_num_t s);
+srtp_err_status_t srtp_key_limit_set(srtp_key_limit_t key, const srtp_xtd_seq_num_t s);
 
-err_status_t
-key_limit_clone(key_limit_t original, key_limit_t *new_key);
+srtp_err_status_t srtp_key_limit_clone(srtp_key_limit_t original, srtp_key_limit_t *new_key);
 
-err_status_t
-key_limit_check(const key_limit_t key);
+srtp_err_status_t srtp_key_limit_check(const srtp_key_limit_t key);
 
-key_event_t
-key_limit_update(key_limit_t key);
+srtp_key_event_t srtp_key_limit_update(srtp_key_limit_t key);
 
-typedef enum { 
-   key_state_normal,
-   key_state_past_soft_limit,
-   key_state_expired
-} key_state_t;
+typedef enum {
+    srtp_key_state_normal,
+    srtp_key_state_past_soft_limit,
+    srtp_key_state_expired
+} srtp_key_state_t;
 
-typedef struct key_limit_ctx_t {
-  xtd_seq_num_t num_left;
-  key_state_t   state;
-} key_limit_ctx_t;
+typedef struct srtp_key_limit_ctx_t {
+    srtp_xtd_seq_num_t num_left;
+    srtp_key_state_t state;
+} srtp_key_limit_ctx_t;
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* KEY_H */