The Tor Browser / file comparison
comparison: netwerk/srtp/src/crypto/hash/auth.c
netwerk/srtp/src/crypto/hash/auth.c
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| -1:000000000000 | 0:ed171ea0b129 |
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| 1 /* | |
| 2 * auth.c | |
| 3 * | |
| 4 * some bookkeeping functions for authentication functions | |
| 5 * | |
| 6 * David A. McGrew | |
| 7 * Cisco Systems, Inc. | |
| 8 */ | |
| 9 | |
| 10 /* | |
| 11 * | |
| 12 * Copyright (c) 2001-2006, Cisco Systems, Inc. | |
| 13 * All rights reserved. | |
| 14 * | |
| 15 * Redistribution and use in source and binary forms, with or without | |
| 16 * modification, are permitted provided that the following conditions | |
| 17 * are met: | |
| 18 * | |
| 19 * Redistributions of source code must retain the above copyright | |
| 20 * notice, this list of conditions and the following disclaimer. | |
| 21 * | |
| 22 * Redistributions in binary form must reproduce the above | |
| 23 * copyright notice, this list of conditions and the following | |
| 24 * disclaimer in the documentation and/or other materials provided | |
| 25 * with the distribution. | |
| 26 * | |
| 27 * Neither the name of the Cisco Systems, Inc. nor the names of its | |
| 28 * contributors may be used to endorse or promote products derived | |
| 29 * from this software without specific prior written permission. | |
| 30 * | |
| 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
| 34 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
| 35 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
| 36 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 37 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 38 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 41 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 42 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 43 * | |
| 44 */ | |
| 45 | |
| 46 #include "auth.h" | |
| 47 | |
| 48 /* the debug module for authentiation */ | |
| 49 | |
| 50 debug_module_t mod_auth = { | |
| 51 0, /* debugging is off by default */ | |
| 52 "auth func" /* printable name for module */ | |
| 53 }; | |
| 54 | |
| 55 | |
| 56 int | |
| 57 auth_get_key_length(const auth_t *a) { | |
| 58 return a->key_len; | |
| 59 } | |
| 60 | |
| 61 int | |
| 62 auth_get_tag_length(const auth_t *a) { | |
| 63 return a->out_len; | |
| 64 } | |
| 65 | |
| 66 int | |
| 67 auth_get_prefix_length(const auth_t *a) { | |
| 68 return a->prefix_len; | |
| 69 } | |
| 70 | |
| 71 int | |
| 72 auth_type_get_ref_count(const auth_type_t *at) { | |
| 73 return at->ref_count; | |
| 74 } | |
| 75 | |
| 76 /* | |
| 77 * auth_type_test() tests an auth function of type ct against | |
| 78 * test cases provided in a list test_data of values of key, data, and tag | |
| 79 * that is known to be good | |
| 80 */ | |
| 81 | |
| 82 /* should be big enough for most occasions */ | |
| 83 #define SELF_TEST_TAG_BUF_OCTETS 32 | |
| 84 | |
| 85 err_status_t | |
| 86 auth_type_test(const auth_type_t *at, const auth_test_case_t *test_data) { | |
| 87 const auth_test_case_t *test_case = test_data; | |
| 88 auth_t *a; | |
| 89 err_status_t status; | |
| 90 uint8_t tag[SELF_TEST_TAG_BUF_OCTETS]; | |
| 91 int i, case_num = 0; | |
| 92 | |
| 93 debug_print(mod_auth, "running self-test for auth function %s", | |
| 94 at->description); | |
| 95 | |
| 96 /* | |
| 97 * check to make sure that we have at least one test case, and | |
| 98 * return an error if we don't - we need to be paranoid here | |
| 99 */ | |
| 100 if (test_case == NULL) | |
| 101 return err_status_cant_check; | |
| 102 | |
| 103 /* loop over all test cases */ | |
| 104 while (test_case != NULL) { | |
| 105 | |
| 106 /* check test case parameters */ | |
| 107 if (test_case->tag_length_octets > SELF_TEST_TAG_BUF_OCTETS) | |
| 108 return err_status_bad_param; | |
| 109 | |
| 110 /* allocate auth */ | |
| 111 status = auth_type_alloc(at, &a, test_case->key_length_octets, | |
| 112 test_case->tag_length_octets); | |
| 113 if (status) | |
| 114 return status; | |
| 115 | |
| 116 /* initialize auth */ | |
| 117 status = auth_init(a, test_case->key); | |
| 118 if (status) { | |
| 119 auth_dealloc(a); | |
| 120 return status; | |
| 121 } | |
| 122 | |
| 123 /* zeroize tag then compute */ | |
| 124 octet_string_set_to_zero(tag, test_case->tag_length_octets); | |
| 125 status = auth_compute(a, test_case->data, | |
| 126 test_case->data_length_octets, tag); | |
| 127 if (status) { | |
| 128 auth_dealloc(a); | |
| 129 return status; | |
| 130 } | |
| 131 | |
| 132 debug_print(mod_auth, "key: %s", | |
| 133 octet_string_hex_string(test_case->key, | |
| 134 test_case->key_length_octets)); | |
| 135 debug_print(mod_auth, "data: %s", | |
| 136 octet_string_hex_string(test_case->data, | |
| 137 test_case->data_length_octets)); | |
| 138 debug_print(mod_auth, "tag computed: %s", | |
| 139 octet_string_hex_string(tag, test_case->tag_length_octets)); | |
| 140 debug_print(mod_auth, "tag expected: %s", | |
| 141 octet_string_hex_string(test_case->tag, | |
| 142 test_case->tag_length_octets)); | |
| 143 | |
| 144 /* check the result */ | |
| 145 status = err_status_ok; | |
| 146 for (i=0; i < test_case->tag_length_octets; i++) | |
| 147 if (tag[i] != test_case->tag[i]) { | |
| 148 status = err_status_algo_fail; | |
| 149 debug_print(mod_auth, "test case %d failed", case_num); | |
| 150 debug_print(mod_auth, " (mismatch at octet %d)", i); | |
| 151 } | |
| 152 if (status) { | |
| 153 auth_dealloc(a); | |
| 154 return err_status_algo_fail; | |
| 155 } | |
| 156 | |
| 157 /* deallocate the auth function */ | |
| 158 status = auth_dealloc(a); | |
| 159 if (status) | |
| 160 return status; | |
| 161 | |
| 162 /* | |
| 163 * the auth function passed the test case, so move on to the next test | |
| 164 * case in the list; if NULL, we'll quit and return an OK | |
| 165 */ | |
| 166 test_case = test_case->next_test_case; | |
| 167 ++case_num; | |
| 168 } | |
| 169 | |
| 170 return err_status_ok; | |
| 171 } | |
| 172 | |
| 173 | |
| 174 /* | |
| 175 * auth_type_self_test(at) performs auth_type_test on at's internal | |
| 176 * list of test data. | |
| 177 */ | |
| 178 | |
| 179 err_status_t | |
| 180 auth_type_self_test(const auth_type_t *at) { | |
| 181 return auth_type_test(at, at->test_data); | |
| 182 } | |
| 183 |
