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/*
* auth.c
*
* some bookkeeping functions for 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.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "auth.h"
#include "err.h" /* for srtp_debug */
#include "datatypes.h" /* for octet_string */
/* the debug module for authentiation */
srtp_debug_module_t srtp_mod_auth = {
0, /* debugging is off by default */
"auth func" /* printable name for module */
};
int srtp_auth_get_key_length(const srtp_auth_t *a)
{
return a->key_len;
}
int srtp_auth_get_tag_length(const srtp_auth_t *a)
{
return a->out_len;
}
int srtp_auth_get_prefix_length(const srtp_auth_t *a)
{
return a->prefix_len;
}
/*
* srtp_auth_type_test() tests an auth function of type ct against
* test cases provided in a list test_data of values of key, data, and tag
* that is known to be good
*/
/* should be big enough for most occasions */
#define SELF_TEST_TAG_BUF_OCTETS 32
srtp_err_status_t srtp_auth_type_test(const srtp_auth_type_t *at,
const srtp_auth_test_case_t *test_data)
{
const srtp_auth_test_case_t *test_case = test_data;
srtp_auth_t *a;
srtp_err_status_t status;
uint8_t tag[SELF_TEST_TAG_BUF_OCTETS];
int i, case_num = 0;
debug_print(srtp_mod_auth, "running self-test for auth function %s",
at->description);
/*
* check to make sure that we have at least one test case, and
* return an error if we don't - we need to be paranoid here
*/
if (test_case == NULL) {
return srtp_err_status_cant_check;
}
/* loop over all test cases */
while (test_case != NULL) {
/* check test case parameters */
if (test_case->tag_length_octets > SELF_TEST_TAG_BUF_OCTETS) {
return srtp_err_status_bad_param;
}
/* allocate auth */
status = srtp_auth_type_alloc(at, &a, test_case->key_length_octets,
test_case->tag_length_octets);
if (status) {
return status;
}
/* initialize auth */
status = srtp_auth_init(a, test_case->key);
if (status) {
srtp_auth_dealloc(a);
return status;
}
status = srtp_auth_start(a);
if (status) {
srtp_auth_dealloc(a);
return status;
}
/* zeroize tag then compute */
octet_string_set_to_zero(tag, test_case->tag_length_octets);
status = srtp_auth_compute(a, test_case->data,
test_case->data_length_octets, tag);
if (status) {
srtp_auth_dealloc(a);
return status;
}
debug_print(srtp_mod_auth, "key: %s",
srtp_octet_string_hex_string(test_case->key,
test_case->key_length_octets));
debug_print(srtp_mod_auth, "data: %s",
srtp_octet_string_hex_string(
test_case->data, test_case->data_length_octets));
debug_print(
srtp_mod_auth, "tag computed: %s",
srtp_octet_string_hex_string(tag, test_case->tag_length_octets));
debug_print(srtp_mod_auth, "tag expected: %s",
srtp_octet_string_hex_string(test_case->tag,
test_case->tag_length_octets));
/* check the result */
status = srtp_err_status_ok;
for (i = 0; i < test_case->tag_length_octets; i++) {
if (tag[i] != test_case->tag[i]) {
status = srtp_err_status_algo_fail;
debug_print(srtp_mod_auth, "test case %d failed", case_num);
debug_print(srtp_mod_auth, " (mismatch at octet %d)", i);
}
}
if (status) {
srtp_auth_dealloc(a);
return srtp_err_status_algo_fail;
}
/* deallocate the auth function */
status = srtp_auth_dealloc(a);
if (status) {
return status;
}
/*
* the auth function passed the test case, so move on to the next test
* case in the list; if NULL, we'll quit and return an OK
*/
test_case = test_case->next_test_case;
++case_num;
}
return srtp_err_status_ok;
}
/*
* srtp_auth_type_self_test(at) performs srtp_auth_type_test on at's internal
* list of test data.
*/
srtp_err_status_t srtp_auth_type_self_test(const srtp_auth_type_t *at)
{
return srtp_auth_type_test(at, at->test_data);
}
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