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comparison: netwerk/srtp/src/crypto/include/auth.h

netwerk/srtp/src/crypto/include/auth.h

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1 /*
2 * auth.h
3 *
4 * common interface to 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 #ifndef AUTH_H
47 #define AUTH_H
48
49 #include "datatypes.h"
50 #include "err.h" /* error codes */
51 #include "crypto.h" /* for auth_type_id_t */
52 #include "crypto_types.h" /* for values of auth_type_id_t */
53
54 typedef struct auth_type_t *auth_type_pointer;
55 typedef struct auth_t *auth_pointer_t;
56
57 typedef err_status_t (*auth_alloc_func)
58 (auth_pointer_t *ap, int key_len, int out_len);
59
60 typedef err_status_t (*auth_init_func)
61 (void *state, const uint8_t *key, int key_len);
62
63 typedef err_status_t (*auth_dealloc_func)(auth_pointer_t ap);
64
65 typedef err_status_t (*auth_compute_func)
66 (void *state, uint8_t *buffer, int octets_to_auth,
67 int tag_len, uint8_t *tag);
68
69 typedef err_status_t (*auth_update_func)
70 (void *state, uint8_t *buffer, int octets_to_auth);
71
72 typedef err_status_t (*auth_start_func)(void *state);
73
74 /* some syntactic sugar on these function types */
75
76 #define auth_type_alloc(at, a, klen, outlen) \
77 ((at)->alloc((a), (klen), (outlen)))
78
79 #define auth_init(a, key) \
80 (((a)->type)->init((a)->state, (key), ((a)->key_len)))
81
82 #define auth_compute(a, buf, len, res) \
83 (((a)->type)->compute((a)->state, (buf), (len), (a)->out_len, (res)))
84
85 #define auth_update(a, buf, len) \
86 (((a)->type)->update((a)->state, (buf), (len)))
87
88 #define auth_start(a)(((a)->type)->start((a)->state))
89
90 #define auth_dealloc(c) (((c)->type)->dealloc(c))
91
92 /* functions to get information about a particular auth_t */
93
94 int
95 auth_get_key_length(const struct auth_t *a);
96
97 int
98 auth_get_tag_length(const struct auth_t *a);
99
100 int
101 auth_get_prefix_length(const struct auth_t *a);
102
103 /*
104 * auth_test_case_t is a (list of) key/message/tag values that are
105 * known to be correct for a particular cipher. this data can be used
106 * to test an implementation in an on-the-fly self test of the
107 * correcness of the implementation. (see the auth_type_self_test()
108 * function below)
109 */
110
111 typedef struct auth_test_case_t {
112 int key_length_octets; /* octets in key */
113 uint8_t *key; /* key */
114 int data_length_octets; /* octets in data */
115 uint8_t *data; /* data */
116 int tag_length_octets; /* octets in tag */
117 uint8_t *tag; /* tag */
118 struct auth_test_case_t *next_test_case; /* pointer to next testcase */
119 } auth_test_case_t;
120
121 /* auth_type_t */
122
123 typedef struct auth_type_t {
124 auth_alloc_func alloc;
125 auth_dealloc_func dealloc;
126 auth_init_func init;
127 auth_compute_func compute;
128 auth_update_func update;
129 auth_start_func start;
130 char *description;
131 int ref_count;
132 auth_test_case_t *test_data;
133 debug_module_t *debug;
134 auth_type_id_t id;
135 } auth_type_t;
136
137 typedef struct auth_t {
138 auth_type_t *type;
139 void *state;
140 int out_len; /* length of output tag in octets */
141 int key_len; /* length of key in octets */
142 int prefix_len; /* length of keystream prefix */
143 } auth_t;
144
145 /*
146 * auth_type_self_test() tests an auth_type against test cases
147 * provided in an array of values of key/message/tag that is known to
148 * be good
149 */
150
151 err_status_t
152 auth_type_self_test(const auth_type_t *at);
153
154 /*
155 * auth_type_test() tests an auth_type against external test cases
156 * provided in an array of values of key/message/tag that is known to
157 * be good
158 */
159
160 err_status_t
161 auth_type_test(const auth_type_t *at, const auth_test_case_t *test_data);
162
163 /*
164 * auth_type_get_ref_count(at) returns the reference count (the number
165 * of instantiations) of the auth_type_t at
166 */
167
168 int
169 auth_type_get_ref_count(const auth_type_t *at);
170
171 #endif /* AUTH_H */

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