Add current version of libSRTP from CVS.

libsrtp/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 "err.h"
+
+typedef struct key_limit_ctx_t *key_limit_t;
+
+typedef enum {
+   key_event_normal,
+   key_event_soft_limit,
+   key_event_hard_limit
+} key_event_t;
+
+err_status_t
+key_limit_set(key_limit_t key, const xtd_seq_num_t s);
+
+err_status_t
+key_limit_clone(key_limit_t original, key_limit_t *new_key);
+
+err_status_t
+key_limit_check(const key_limit_t key);
+
+key_event_t
+key_limit_update(key_limit_t key);
+
+typedef enum { 
+   key_state_normal,
+   key_state_past_soft_limit,
+   key_state_expired
+} key_state_t;
+
+typedef struct key_limit_ctx_t {
+  xtd_seq_num_t num_left;
+  key_state_t   state;
+} key_limit_ctx_t;
+
+#endif /* KEY_H */