167 lines
6 KiB
C
167 lines
6 KiB
C
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/*
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* auth.h
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*
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* common interface to authentication functions
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright (c) 2001-2017, Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef SRTP_AUTH_H
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#define SRTP_AUTH_H
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#include "srtp.h"
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#include "crypto_types.h" /* for values of auth_type_id_t */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef const struct srtp_auth_type_t *srtp_auth_type_pointer;
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typedef struct srtp_auth_t *srtp_auth_pointer_t;
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typedef srtp_err_status_t (*srtp_auth_alloc_func)
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(srtp_auth_pointer_t *ap, int key_len, int out_len);
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typedef srtp_err_status_t (*srtp_auth_init_func)
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(void *state, const uint8_t *key, int key_len);
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typedef srtp_err_status_t (*srtp_auth_dealloc_func)(srtp_auth_pointer_t ap);
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typedef srtp_err_status_t (*srtp_auth_compute_func)
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(void *state, const uint8_t *buffer, int octets_to_auth,
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int tag_len, uint8_t *tag);
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typedef srtp_err_status_t (*srtp_auth_update_func)
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(void *state, const uint8_t *buffer, int octets_to_auth);
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typedef srtp_err_status_t (*srtp_auth_start_func)(void *state);
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/* some syntactic sugar on these function types */
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#define srtp_auth_type_alloc(at, a, klen, outlen) \
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((at)->alloc((a), (klen), (outlen)))
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#define srtp_auth_init(a, key) \
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(((a)->type)->init((a)->state, (key), ((a)->key_len)))
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#define srtp_auth_compute(a, buf, len, res) \
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(((a)->type)->compute((a)->state, (buf), (len), (a)->out_len, (res)))
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#define srtp_auth_update(a, buf, len) \
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(((a)->type)->update((a)->state, (buf), (len)))
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#define srtp_auth_start(a)(((a)->type)->start((a)->state))
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#define srtp_auth_dealloc(c) (((c)->type)->dealloc(c))
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/* functions to get information about a particular auth_t */
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int srtp_auth_get_key_length(const struct srtp_auth_t *a);
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int srtp_auth_get_tag_length(const struct srtp_auth_t *a);
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int srtp_auth_get_prefix_length(const struct srtp_auth_t *a);
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/*
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* srtp_auth_test_case_t is a (list of) key/message/tag values that are
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* known to be correct for a particular cipher. this data can be used
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* to test an implementation in an on-the-fly self test of the
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* correctness of the implementation. (see the srtp_auth_type_self_test()
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* function below)
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*/
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typedef struct srtp_auth_test_case_t {
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int key_length_octets; /* octets in key */
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const uint8_t *key; /* key */
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int data_length_octets; /* octets in data */
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const uint8_t *data; /* data */
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int tag_length_octets; /* octets in tag */
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const uint8_t *tag; /* tag */
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const struct srtp_auth_test_case_t *next_test_case; /* pointer to next testcase */
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} srtp_auth_test_case_t;
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/* srtp_auth_type_t */
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typedef struct srtp_auth_type_t {
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srtp_auth_alloc_func alloc;
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srtp_auth_dealloc_func dealloc;
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srtp_auth_init_func init;
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srtp_auth_compute_func compute;
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srtp_auth_update_func update;
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srtp_auth_start_func start;
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const char *description;
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const srtp_auth_test_case_t *test_data;
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srtp_auth_type_id_t id;
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} srtp_auth_type_t;
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typedef struct srtp_auth_t {
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const srtp_auth_type_t *type;
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void *state;
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int out_len; /* length of output tag in octets */
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int key_len; /* length of key in octets */
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int prefix_len; /* length of keystream prefix */
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} srtp_auth_t;
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/*
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* srtp_auth_type_self_test() tests an auth_type against test cases
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* provided in an array of values of key/message/tag that is known to
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* be good
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*/
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srtp_err_status_t srtp_auth_type_self_test(const srtp_auth_type_t *at);
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/*
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* srtp_auth_type_test() tests an auth_type against external test cases
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* provided in an array of values of key/message/tag that is known to
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* be good
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*/
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srtp_err_status_t srtp_auth_type_test(const srtp_auth_type_t *at,
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const srtp_auth_test_case_t *test_data);
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/*
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* srtp_replace_auth_type(ct, id)
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*
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* replaces srtp's kernel's auth type implementation for the auth_type id
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* with a new one passed in externally. The new auth type must pass all the
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* existing auth_type's self tests as well as its own.
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*/
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srtp_err_status_t srtp_replace_auth_type(const srtp_auth_type_t *ct, srtp_auth_type_id_t id);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SRTP_AUTH_H */
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