1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*
* 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
};
|
