| Alexandre Lision | 67916dd | 2014-01-24 13:33:04 -0500 | [diff] [blame] | 1 | /* |
| 2 | * null_auth.c |
| 3 | * |
| 4 | * implements the do-nothing auth algorithm |
| 5 | * |
| 6 | * David A. McGrew |
| 7 | * Cisco Systems, Inc. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * |
| 13 | * Copyright (c) 2001-2006, Cisco Systems, Inc. |
| 14 | * All rights reserved. |
| 15 | * |
| 16 | * Redistribution and use in source and binary forms, with or without |
| 17 | * modification, are permitted provided that the following conditions |
| 18 | * are met: |
| 19 | * |
| 20 | * Redistributions of source code must retain the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer. |
| 22 | * |
| 23 | * Redistributions in binary form must reproduce the above |
| 24 | * copyright notice, this list of conditions and the following |
| 25 | * disclaimer in the documentation and/or other materials provided |
| 26 | * with the distribution. |
| 27 | * |
| 28 | * Neither the name of the Cisco Systems, Inc. nor the names of its |
| 29 | * contributors may be used to endorse or promote products derived |
| 30 | * from this software without specific prior written permission. |
| 31 | * |
| 32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 35 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 36 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| 37 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 38 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 39 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 40 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 41 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 42 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 43 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 44 | * |
| 45 | */ |
| 46 | |
| 47 | |
| 48 | #include "null_auth.h" |
| 49 | #include "alloc.h" |
| 50 | |
| 51 | /* null_auth uses the auth debug module */ |
| 52 | |
| 53 | extern debug_module_t mod_auth; |
| 54 | |
| 55 | err_status_t |
| 56 | null_auth_alloc(auth_t **a, int key_len, int out_len) { |
| 57 | extern auth_type_t null_auth; |
| 58 | uint8_t *pointer; |
| 59 | |
| 60 | debug_print(mod_auth, "allocating auth func with key length %d", key_len); |
| 61 | debug_print(mod_auth, " tag length %d", out_len); |
| 62 | |
| 63 | /* allocate memory for auth and null_auth_ctx_t structures */ |
| 64 | pointer = (uint8_t*)crypto_alloc(sizeof(null_auth_ctx_t) + sizeof(auth_t)); |
| 65 | if (pointer == NULL) |
| 66 | return err_status_alloc_fail; |
| 67 | |
| 68 | /* set pointers */ |
| 69 | *a = (auth_t *)pointer; |
| 70 | (*a)->type = &null_auth; |
| 71 | (*a)->state = pointer + sizeof (auth_t); |
| 72 | (*a)->out_len = out_len; |
| 73 | (*a)->prefix_len = out_len; |
| 74 | (*a)->key_len = key_len; |
| 75 | |
| 76 | /* increment global count of all null_auth uses */ |
| 77 | null_auth.ref_count++; |
| 78 | |
| 79 | return err_status_ok; |
| 80 | } |
| 81 | |
| 82 | err_status_t |
| 83 | null_auth_dealloc(auth_t *a) { |
| 84 | extern auth_type_t null_auth; |
| 85 | |
| 86 | /* zeroize entire state*/ |
| 87 | octet_string_set_to_zero((uint8_t *)a, |
| 88 | sizeof(null_auth_ctx_t) + sizeof(auth_t)); |
| 89 | |
| 90 | /* free memory */ |
| 91 | crypto_free(a); |
| 92 | |
| 93 | /* decrement global count of all null_auth uses */ |
| 94 | null_auth.ref_count--; |
| 95 | |
| 96 | return err_status_ok; |
| 97 | } |
| 98 | |
| 99 | err_status_t |
| 100 | null_auth_init(null_auth_ctx_t *state, const uint8_t *key, int key_len) { |
| 101 | |
| 102 | /* accept any length of key, and do nothing */ |
| 103 | |
| 104 | return err_status_ok; |
| 105 | } |
| 106 | |
| 107 | err_status_t |
| 108 | null_auth_compute(null_auth_ctx_t *state, uint8_t *message, |
| 109 | int msg_octets, int tag_len, uint8_t *result) { |
| 110 | |
| 111 | return err_status_ok; |
| 112 | } |
| 113 | |
| 114 | err_status_t |
| 115 | null_auth_update(null_auth_ctx_t *state, uint8_t *message, |
| 116 | int msg_octets) { |
| 117 | |
| 118 | return err_status_ok; |
| 119 | } |
| 120 | |
| 121 | err_status_t |
| 122 | null_auth_start(null_auth_ctx_t *state) { |
| 123 | return err_status_ok; |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * auth_type_t - defines description, test case, and null_auth |
| 128 | * metaobject |
| 129 | */ |
| 130 | |
| 131 | /* begin test case 0 */ |
| 132 | |
| 133 | auth_test_case_t |
| 134 | null_auth_test_case_0 = { |
| 135 | 0, /* octets in key */ |
| 136 | NULL, /* key */ |
| 137 | 0, /* octets in data */ |
| 138 | NULL, /* data */ |
| 139 | 0, /* octets in tag */ |
| 140 | NULL, /* tag */ |
| 141 | NULL /* pointer to next testcase */ |
| 142 | }; |
| 143 | |
| 144 | /* end test case 0 */ |
| 145 | |
| 146 | char null_auth_description[] = "null authentication function"; |
| 147 | |
| 148 | auth_type_t |
| 149 | null_auth = { |
| 150 | (auth_alloc_func) null_auth_alloc, |
| 151 | (auth_dealloc_func) null_auth_dealloc, |
| 152 | (auth_init_func) null_auth_init, |
| 153 | (auth_compute_func) null_auth_compute, |
| 154 | (auth_update_func) null_auth_update, |
| 155 | (auth_start_func) null_auth_start, |
| 156 | (char *) null_auth_description, |
| 157 | (int) 0, /* instance count */ |
| 158 | (auth_test_case_t *) &null_auth_test_case_0 |
| 159 | }; |
| 160 | |