Add current version of libSRTP from CVS.

libsrtp/crypto/include/hmac.h

+/*
+ * hmac.h
+ *
+ * interface to hmac auth_type_t
+ *
+ * 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 HMAC_H
+#define HMAC_H
+
+#include "auth.h"
+#include "sha1.h"
+
+typedef struct {
+  uint8_t    opad[64];
+  sha1_ctx_t ctx;
+  sha1_ctx_t init_ctx;
+} hmac_ctx_t;
+
+err_status_t
+hmac_alloc(auth_t **a, int key_len, int out_len);
+
+err_status_t
+hmac_dealloc(auth_t *a);
+
+err_status_t
+hmac_init(hmac_ctx_t *state, const uint8_t *key, int key_len);
+
+err_status_t
+hmac_start(hmac_ctx_t *state);
+
+err_status_t
+hmac_update(hmac_ctx_t *state, const uint8_t *message, int msg_octets);
+
+err_status_t
+hmac_compute(hmac_ctx_t *state, const void *message,
+             int msg_octets, int tag_len, uint8_t *result);
+
+
+#endif /* HMAC_H */