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/*
* auth.c
*
* some bookkeeping functions for 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.
*
*/
#include "auth.h"
/* the debug module for authentiation */
debug_module_t mod_auth = {
0, /* debugging is off by default */
"auth func" /* printable name for module */
};
int
auth_get_key_length(const auth_t *a) {
return a->key_len;
}
int
auth_get_tag_length(const auth_t *a) {
return a->out_len;
}
int
auth_get_prefix_length(const auth_t *a) {
return a->prefix_len;
}
int
auth_type_get_ref_count(const auth_type_t *at) {
return at->ref_count;
}
/*
* auth_type_self_test() tests an auth function of type ct against
* test cases provided in an array 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
err_status_t
auth_type_self_test(const auth_type_t *at) {
auth_test_case_t *test_case = at->test_data;
auth_t *a;
err_status_t status;
uint8_t tag[SELF_TEST_TAG_BUF_OCTETS];
int i, case_num = 0;
debug_print(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 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 err_status_bad_param;
/* allocate auth */
status = auth_type_alloc(at, &a, test_case->key_length_octets,
test_case->tag_length_octets);
if (status)
return status;
/* initialize auth */
status = auth_init(a, test_case->key);
if (status) {
auth_dealloc(a);
return status;
}
/* zeroize tag then compute */
octet_string_set_to_zero(tag, test_case->tag_length_octets);
status = auth_compute(a, test_case->data,
test_case->data_length_octets, tag);
if (status) {
auth_dealloc(a);
return status;
}
debug_print(mod_auth, "key: %s",
octet_string_hex_string(test_case->key,
test_case->key_length_octets));
debug_print(mod_auth, "data: %s",
octet_string_hex_string(test_case->data,
test_case->data_length_octets));
debug_print(mod_auth, "tag computed: %s",
octet_string_hex_string(tag, test_case->tag_length_octets));
debug_print(mod_auth, "tag expected: %s",
octet_string_hex_string(test_case->tag,
test_case->tag_length_octets));
/* check the result */
status = err_status_ok;
for (i=0; i < test_case->tag_length_octets; i++)
if (tag[i] != test_case->tag[i]) {
status = err_status_algo_fail;
debug_print(mod_auth, "test case %d failed", case_num);
debug_print(mod_auth, " (mismatch at octet %d)", i);
}
if (status) {
auth_dealloc(a);
return err_status_algo_fail;
}
/* deallocate the auth function */
status = 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 err_status_ok;
}
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