1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/netwerk/srtp/src/crypto/hash/null_auth.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,162 @@
1.4 +/*
1.5 + * null_auth.c
1.6 + *
1.7 + * implements the do-nothing auth algorithm
1.8 + *
1.9 + * David A. McGrew
1.10 + * Cisco Systems, Inc.
1.11 + *
1.12 + */
1.13 +
1.14 +/*
1.15 + *
1.16 + * Copyright (c) 2001-2006, Cisco Systems, Inc.
1.17 + * All rights reserved.
1.18 + *
1.19 + * Redistribution and use in source and binary forms, with or without
1.20 + * modification, are permitted provided that the following conditions
1.21 + * are met:
1.22 + *
1.23 + * Redistributions of source code must retain the above copyright
1.24 + * notice, this list of conditions and the following disclaimer.
1.25 + *
1.26 + * Redistributions in binary form must reproduce the above
1.27 + * copyright notice, this list of conditions and the following
1.28 + * disclaimer in the documentation and/or other materials provided
1.29 + * with the distribution.
1.30 + *
1.31 + * Neither the name of the Cisco Systems, Inc. nor the names of its
1.32 + * contributors may be used to endorse or promote products derived
1.33 + * from this software without specific prior written permission.
1.34 + *
1.35 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.36 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.37 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
1.38 + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
1.39 + * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
1.40 + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1.41 + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
1.42 + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.43 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
1.44 + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.45 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
1.46 + * OF THE POSSIBILITY OF SUCH DAMAGE.
1.47 + *
1.48 + */
1.49 +
1.50 +
1.51 +#include "null_auth.h"
1.52 +#include "alloc.h"
1.53 +
1.54 +/* null_auth uses the auth debug module */
1.55 +
1.56 +extern debug_module_t mod_auth;
1.57 +
1.58 +err_status_t
1.59 +null_auth_alloc(auth_t **a, int key_len, int out_len) {
1.60 + extern auth_type_t null_auth;
1.61 + uint8_t *pointer;
1.62 +
1.63 + debug_print(mod_auth, "allocating auth func with key length %d", key_len);
1.64 + debug_print(mod_auth, " tag length %d", out_len);
1.65 +
1.66 + /* allocate memory for auth and null_auth_ctx_t structures */
1.67 + pointer = (uint8_t*)crypto_alloc(sizeof(null_auth_ctx_t) + sizeof(auth_t));
1.68 + if (pointer == NULL)
1.69 + return err_status_alloc_fail;
1.70 +
1.71 + /* set pointers */
1.72 + *a = (auth_t *)pointer;
1.73 + (*a)->type = &null_auth;
1.74 + (*a)->state = pointer + sizeof (auth_t);
1.75 + (*a)->out_len = out_len;
1.76 + (*a)->prefix_len = out_len;
1.77 + (*a)->key_len = key_len;
1.78 +
1.79 + /* increment global count of all null_auth uses */
1.80 + null_auth.ref_count++;
1.81 +
1.82 + return err_status_ok;
1.83 +}
1.84 +
1.85 +err_status_t
1.86 +null_auth_dealloc(auth_t *a) {
1.87 + extern auth_type_t null_auth;
1.88 +
1.89 + /* zeroize entire state*/
1.90 + octet_string_set_to_zero((uint8_t *)a,
1.91 + sizeof(null_auth_ctx_t) + sizeof(auth_t));
1.92 +
1.93 + /* free memory */
1.94 + crypto_free(a);
1.95 +
1.96 + /* decrement global count of all null_auth uses */
1.97 + null_auth.ref_count--;
1.98 +
1.99 + return err_status_ok;
1.100 +}
1.101 +
1.102 +err_status_t
1.103 +null_auth_init(null_auth_ctx_t *state, const uint8_t *key, int key_len) {
1.104 +
1.105 + /* accept any length of key, and do nothing */
1.106 +
1.107 + return err_status_ok;
1.108 +}
1.109 +
1.110 +err_status_t
1.111 +null_auth_compute(null_auth_ctx_t *state, uint8_t *message,
1.112 + int msg_octets, int tag_len, uint8_t *result) {
1.113 +
1.114 + return err_status_ok;
1.115 +}
1.116 +
1.117 +err_status_t
1.118 +null_auth_update(null_auth_ctx_t *state, uint8_t *message,
1.119 + int msg_octets) {
1.120 +
1.121 + return err_status_ok;
1.122 +}
1.123 +
1.124 +err_status_t
1.125 +null_auth_start(null_auth_ctx_t *state) {
1.126 + return err_status_ok;
1.127 +}
1.128 +
1.129 +/*
1.130 + * auth_type_t - defines description, test case, and null_auth
1.131 + * metaobject
1.132 + */
1.133 +
1.134 +/* begin test case 0 */
1.135 +
1.136 +auth_test_case_t
1.137 +null_auth_test_case_0 = {
1.138 + 0, /* octets in key */
1.139 + NULL, /* key */
1.140 + 0, /* octets in data */
1.141 + NULL, /* data */
1.142 + 0, /* octets in tag */
1.143 + NULL, /* tag */
1.144 + NULL /* pointer to next testcase */
1.145 +};
1.146 +
1.147 +/* end test case 0 */
1.148 +
1.149 +char null_auth_description[] = "null authentication function";
1.150 +
1.151 +auth_type_t
1.152 +null_auth = {
1.153 + (auth_alloc_func) null_auth_alloc,
1.154 + (auth_dealloc_func) null_auth_dealloc,
1.155 + (auth_init_func) null_auth_init,
1.156 + (auth_compute_func) null_auth_compute,
1.157 + (auth_update_func) null_auth_update,
1.158 + (auth_start_func) null_auth_start,
1.159 + (char *) null_auth_description,
1.160 + (int) 0, /* instance count */
1.161 + (auth_test_case_t *) &null_auth_test_case_0,
1.162 + (debug_module_t *) NULL,
1.163 + (auth_type_id_t) NULL_AUTH
1.164 +};
1.165 +
