Update libsrtp to version 2.0

crypto/include/auth.h

+/*
+ * auth.h
+ *
+ * common interface to authentication functions
+ *
+ * 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 AUTH_H
+#define AUTH_H
+
+#include "srtp.h"
+#include "crypto_types.h"       /* for values of auth_type_id_t */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef const struct srtp_auth_type_t *srtp_auth_type_pointer;
+typedef struct srtp_auth_t      *srtp_auth_pointer_t;
+
+typedef srtp_err_status_t (*srtp_auth_alloc_func)
+    (srtp_auth_pointer_t *ap, int key_len, int out_len);
+
+typedef srtp_err_status_t (*srtp_auth_init_func)
+    (void *state, const uint8_t *key, int key_len);
+
+typedef srtp_err_status_t (*srtp_auth_dealloc_func)(srtp_auth_pointer_t ap);
+
+typedef srtp_err_status_t (*srtp_auth_compute_func)
+    (void *state, const uint8_t *buffer, int octets_to_auth,
+    int tag_len, uint8_t *tag);
+
+typedef srtp_err_status_t (*srtp_auth_update_func)
+    (void *state, const uint8_t *buffer, int octets_to_auth);
+
+typedef srtp_err_status_t (*srtp_auth_start_func)(void *state);
+
+/* some syntactic sugar on these function types */
+#define srtp_auth_type_alloc(at, a, klen, outlen)                        \
+    ((at)->alloc((a), (klen), (outlen)))
+
+#define srtp_auth_init(a, key)                                           \
+    (((a)->type)->init((a)->state, (key), ((a)->key_len)))
+
+#define srtp_auth_compute(a, buf, len, res)                              \
+    (((a)->type)->compute((a)->state, (buf), (len), (a)->out_len, (res)))
+
+#define srtp_auth_update(a, buf, len)                                    \
+    (((a)->type)->update((a)->state, (buf), (len)))
+
+#define srtp_auth_start(a)(((a)->type)->start((a)->state))
+
+#define srtp_auth_dealloc(c) (((c)->type)->dealloc(c))
+
+/* functions to get information about a particular auth_t */
+int srtp_auth_get_key_length(const struct srtp_auth_t *a);
+
+int srtp_auth_get_tag_length(const struct srtp_auth_t *a);
+
+int srtp_auth_get_prefix_length(const struct srtp_auth_t *a);
+
+/*
+ * srtp_auth_test_case_t is a (list of) key/message/tag values that are
+ * known to be correct for a particular cipher.  this data can be used
+ * to test an implementation in an on-the-fly self test of the
+ * correctness of the implementation.  (see the srtp_auth_type_self_test()
+ * function below)
+ */
+typedef struct srtp_auth_test_case_t {
+    int key_length_octets;                        /* octets in key            */
+    const uint8_t *key;                                 /* key                      */
+    int data_length_octets;                       /* octets in data           */
+    const uint8_t *data;                                /* data                     */
+    int tag_length_octets;                        /* octets in tag            */
+    const uint8_t *tag;                                 /* tag                      */
+    const struct srtp_auth_test_case_t *next_test_case; /* pointer to next testcase */
+} srtp_auth_test_case_t;
+
+/* srtp_auth_type_t */
+typedef struct srtp_auth_type_t {
+    srtp_auth_alloc_func alloc;
+    srtp_auth_dealloc_func dealloc;
+    srtp_auth_init_func init;
+    srtp_auth_compute_func compute;
+    srtp_auth_update_func update;
+    srtp_auth_start_func start;
+    const char                *description;
+    const srtp_auth_test_case_t    *test_data;
+    srtp_auth_type_id_t id;
+} srtp_auth_type_t;
+
+typedef struct srtp_auth_t {
+    const srtp_auth_type_t *type;
+    void        *state;
+    int out_len;                  /* length of output tag in octets */
+    int key_len;                  /* length of key in octets        */
+    int prefix_len;               /* length of keystream prefix     */
+} srtp_auth_t;
+
+/*
+ * srtp_auth_type_self_test() tests an auth_type against test cases
+ * provided in an array of values of key/message/tag that is known to
+ * be good
+ */
+srtp_err_status_t srtp_auth_type_self_test(const srtp_auth_type_t *at);
+
+/*
+ * srtp_auth_type_test() tests an auth_type against external test cases
+ * provided in an array of values of key/message/tag that is known to
+ * be good
+ */
+srtp_err_status_t srtp_auth_type_test(const srtp_auth_type_t *at, 
+        const srtp_auth_test_case_t *test_data);
+
+/*
+ * srtp_replace_auth_type(ct, id)
+ *
+ * replaces srtp's kernel's auth type implementation for the auth_type id
+ * with a new one passed in externally.  The new auth type must pass all the
+ * existing auth_type's self tests as well as its own.
+ */
+srtp_err_status_t srtp_replace_auth_type(const srtp_auth_type_t *ct, srtp_auth_type_id_t id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AUTH_H */