OLD | NEW |
| (Empty) |
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 #ifdef HAVE_CONFIG_H | |
48 #include <config.h> | |
49 #endif | |
50 | |
51 #include "null_auth.h" | |
52 #include "alloc.h" | |
53 | |
54 /* null_auth uses the auth debug module */ | |
55 | |
56 extern debug_module_t mod_auth; | |
57 | |
58 err_status_t | |
59 null_auth_alloc(auth_t **a, int key_len, int out_len) { | |
60 extern auth_type_t null_auth; | |
61 uint8_t *pointer; | |
62 | |
63 debug_print(mod_auth, "allocating auth func with key length %d", key_len); | |
64 debug_print(mod_auth, " tag length %d", out_len); | |
65 | |
66 /* allocate memory for auth and null_auth_ctx_t structures */ | |
67 pointer = (uint8_t*)crypto_alloc(sizeof(null_auth_ctx_t) + sizeof(auth_t)); | |
68 if (pointer == NULL) | |
69 return err_status_alloc_fail; | |
70 | |
71 /* set pointers */ | |
72 *a = (auth_t *)pointer; | |
73 (*a)->type = &null_auth; | |
74 (*a)->state = pointer + sizeof (auth_t); | |
75 (*a)->out_len = out_len; | |
76 (*a)->prefix_len = out_len; | |
77 (*a)->key_len = key_len; | |
78 | |
79 /* increment global count of all null_auth uses */ | |
80 null_auth.ref_count++; | |
81 | |
82 return err_status_ok; | |
83 } | |
84 | |
85 err_status_t | |
86 null_auth_dealloc(auth_t *a) { | |
87 extern auth_type_t null_auth; | |
88 | |
89 /* zeroize entire state*/ | |
90 octet_string_set_to_zero((uint8_t *)a, | |
91 sizeof(null_auth_ctx_t) + sizeof(auth_t)); | |
92 | |
93 /* free memory */ | |
94 crypto_free(a); | |
95 | |
96 /* decrement global count of all null_auth uses */ | |
97 null_auth.ref_count--; | |
98 | |
99 return err_status_ok; | |
100 } | |
101 | |
102 err_status_t | |
103 null_auth_init(null_auth_ctx_t *state, const uint8_t *key, int key_len) { | |
104 | |
105 /* accept any length of key, and do nothing */ | |
106 | |
107 return err_status_ok; | |
108 } | |
109 | |
110 err_status_t | |
111 null_auth_compute(null_auth_ctx_t *state, uint8_t *message, | |
112 int msg_octets, int tag_len, uint8_t *result) { | |
113 | |
114 return err_status_ok; | |
115 } | |
116 | |
117 err_status_t | |
118 null_auth_update(null_auth_ctx_t *state, uint8_t *message, | |
119 int msg_octets) { | |
120 | |
121 return err_status_ok; | |
122 } | |
123 | |
124 err_status_t | |
125 null_auth_start(null_auth_ctx_t *state) { | |
126 return err_status_ok; | |
127 } | |
128 | |
129 /* | |
130 * auth_type_t - defines description, test case, and null_auth | |
131 * metaobject | |
132 */ | |
133 | |
134 /* begin test case 0 */ | |
135 | |
136 auth_test_case_t | |
137 null_auth_test_case_0 = { | |
138 0, /* octets in key */ | |
139 NULL, /* key */ | |
140 0, /* octets in data */ | |
141 NULL, /* data */ | |
142 0, /* octets in tag */ | |
143 NULL, /* tag */ | |
144 NULL /* pointer to next testcase */ | |
145 }; | |
146 | |
147 /* end test case 0 */ | |
148 | |
149 char null_auth_description[] = "null authentication function"; | |
150 | |
151 auth_type_t | |
152 null_auth = { | |
153 (auth_alloc_func) null_auth_alloc, | |
154 (auth_dealloc_func) null_auth_dealloc, | |
155 (auth_init_func) null_auth_init, | |
156 (auth_compute_func) null_auth_compute, | |
157 (auth_update_func) null_auth_update, | |
158 (auth_start_func) null_auth_start, | |
159 (char *) null_auth_description, | |
160 (int) 0, /* instance count */ | |
161 (auth_test_case_t *) &null_auth_test_case_0, | |
162 (debug_module_t *) NULL, | |
163 (auth_type_id_t) NULL_AUTH | |
164 }; | |
165 | |
OLD | NEW |