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/*
* null_auth.c
*
* implements the do-nothing auth algorithm
*
* 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 "null_auth.h"
#include "alloc.h"
/* null_auth uses the auth debug module */
extern debug_module_t mod_auth;
err_status_t
null_auth_alloc(auth_t **a, int key_len, int out_len) {
extern auth_type_t null_auth;
uint8_t *pointer;
debug_print(mod_auth, "allocating auth func with key length %d", key_len);
debug_print(mod_auth, " tag length %d", out_len);
/* allocate memory for auth and null_auth_ctx_t structures */
pointer = (uint8_t*)crypto_alloc(sizeof(null_auth_ctx_t) + sizeof(auth_t));
if (pointer == NULL)
return err_status_alloc_fail;
/* set pointers */
*a = (auth_t *)pointer;
(*a)->type = &null_auth;
(*a)->state = pointer + sizeof (auth_t);
(*a)->out_len = out_len;
(*a)->prefix_len = out_len;
(*a)->key_len = key_len;
/* increment global count of all null_auth uses */
null_auth.ref_count++;
return err_status_ok;
}
err_status_t
null_auth_dealloc(auth_t *a) {
extern auth_type_t null_auth;
/* zeroize entire state*/
octet_string_set_to_zero((uint8_t *)a,
sizeof(null_auth_ctx_t) + sizeof(auth_t));
/* free memory */
crypto_free(a);
/* decrement global count of all null_auth uses */
null_auth.ref_count--;
return err_status_ok;
}
err_status_t
null_auth_init(null_auth_ctx_t *state, const uint8_t *key, int key_len) {
/* accept any length of key, and do nothing */
return err_status_ok;
}
err_status_t
null_auth_compute(null_auth_ctx_t *state, uint8_t *message,
int msg_octets, int tag_len, uint8_t *result) {
return err_status_ok;
}
err_status_t
null_auth_update(null_auth_ctx_t *state, uint8_t *message,
int msg_octets) {
return err_status_ok;
}
err_status_t
null_auth_start(null_auth_ctx_t *state) {
return err_status_ok;
}
/*
* auth_type_t - defines description, test case, and null_auth
* metaobject
*/
/* begin test case 0 */
auth_test_case_t
null_auth_test_case_0 = {
0, /* octets in key */
NULL, /* key */
0, /* octets in data */
NULL, /* data */
0, /* octets in tag */
NULL, /* tag */
NULL /* pointer to next testcase */
};
/* end test case 0 */
char null_auth_description[] = "null authentication function";
auth_type_t
null_auth = {
(auth_alloc_func) null_auth_alloc,
(auth_dealloc_func) null_auth_dealloc,
(auth_init_func) null_auth_init,
(auth_compute_func) null_auth_compute,
(auth_update_func) null_auth_update,
(auth_start_func) null_auth_start,
(char *) null_auth_description,
(int) 0, /* instance count */
(auth_test_case_t *) &null_auth_test_case_0,
(debug_module_t *) NULL,
(auth_type_id_t) NULL_AUTH
};
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