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/*
* auth.h
*
* common interface to authentication functions
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright (c) 2001-2017, 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_AUTH_H
#define SRTP_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 /* SRTP_AUTH_H */
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