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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* crypto_types.h
*
* constants for cipher types and auth func types
*
* 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.
*
*/
#ifndef CRYPTO_TYPES_H
#define CRYPTO_TYPES_H
/**
* @defgroup Algos Cryptographic Algorithms
*
*
* This library provides several different cryptographic algorithms,
* each of which can be selected by using the cipher_type_id_t and
* auth_type_id_t. These algorithms are documented below.
*
* Authentication functions that use the Universal Security Transform
* (UST) must be used in conjunction with a cipher other than the null
* cipher. These functions require a per-message pseudorandom input
* that is generated by the cipher.
*
* The identifiers STRONGHOLD_AUTH and STRONGHOLD_CIPHER identify the
* strongest available authentication function and cipher,
* respectively. They are resolved at compile time to the strongest
* available algorithm. The stronghold algorithms can serve as did
* the keep of a medieval fortification; they provide the strongest
* defense (or the last refuge).
*
* @{
*/
/**
* @defgroup Ciphers Cipher Types
*
* @brief Each cipher type is identified by an unsigned integer. The
* cipher types available in this edition of libSRTP are given
* by the #defines below.
*
* A cipher_type_id_t is an identifier for a cipher_type; only values
* given by the #defines above (or those present in the file
* crypto_types.h) should be used.
*
* The identifier STRONGHOLD_CIPHER indicates the strongest available
* cipher, allowing an application to choose the strongest available
* algorithm without any advance knowledge about the avaliable
* algorithms.
*
* @{
*/
/**
* @brief The null cipher performs no encryption.
*
* The NULL_CIPHER leaves its inputs unaltered, during both the
* encryption and decryption operations. This cipher can be chosen
* to indicate that no encryption is to be performed.
*/
#define NULL_CIPHER 0
/**
* @brief AES Integer Counter Mode (AES ICM)
*
* AES ICM is the variant of counter mode that is used by Secure RTP.
* This cipher uses a 16-, 24-, or 32-octet key concatenated with a
* 14-octet offset (or salt) value.
*/
#define AES_ICM 1
/**
* @brief AES-128 Integer Counter Mode (AES ICM)
* AES-128 ICM is a deprecated alternate name for AES ICM.
*/
#define AES_128_ICM AES_ICM
/**
* @brief SEAL 3.0
*
* SEAL is the Software-Optimized Encryption Algorithm of Coppersmith
* and Rogaway. Nota bene: this cipher is IBM proprietary.
*/
#define SEAL 2
/**
* @brief AES Cipher Block Chaining mode (AES CBC)
*
* AES CBC is the AES Cipher Block Chaining mode.
* This cipher uses a 16-, 24-, or 32-octet key.
*/
#define AES_CBC 3
/**
* @brief AES-128 Cipher Block Chaining mode (AES CBC)
*
* AES-128 CBC is a deprecated alternate name for AES CBC.
*/
#define AES_128_CBC AES_CBC
/**
* @brief Strongest available cipher.
*
* This identifier resolves to the strongest cipher type available.
*/
#define STRONGHOLD_CIPHER AES_ICM
/**
* @}
*/
/**
* @defgroup Authentication Authentication Function Types
*
* @brief Each authentication function type is identified by an
* unsigned integer. The authentication function types available in
* this edition of libSRTP are given by the #defines below.
*
* An auth_type_id_t is an identifier for an authentication function type;
* only values given by the #defines above (or those present in the
* file crypto_types.h) should be used.
*
* The identifier STRONGHOLD_AUTH indicates the strongest available
* authentication function, allowing an application to choose the
* strongest available algorithm without any advance knowledge about
* the avaliable algorithms. The stronghold algorithms can serve as
* did the keep of a medieval fortification; they provide the
* strongest defense (or the last refuge).
*
* @{
*/
/**
* @brief The null authentication function performs no authentication.
*
* The NULL_AUTH function does nothing, and can be selected to indicate
* that authentication should not be performed.
*/
#define NULL_AUTH 0
/**
* @brief UST with TMMH Version 2
*
* UST_TMMHv2 implements the Truncated Multi-Modular Hash using
* UST. This function must be used in conjunction with a cipher other
* than the null cipher.
* with a cipher.
*/
#define UST_TMMHv2 1
/**
* @brief (UST) AES-128 XORMAC
*
* UST_AES_128_XMAC implements AES-128 XORMAC, using UST. Nota bene:
* the XORMAC algorithm is IBM proprietary.
*/
#define UST_AES_128_XMAC 2
/**
* @brief HMAC-SHA1
*
* HMAC_SHA1 implements the Hash-based MAC using the NIST Secure
* Hash Algorithm version 1 (SHA1).
*/
#define HMAC_SHA1 3
/**
* @brief Strongest available authentication function.
*
* This identifier resolves to the strongest available authentication
* function.
*/
#define STRONGHOLD_AUTH HMAC_SHA1
/**
* @}
*/
/**
* @}
*/
#endif /* CRYPTO_TYPES_H */
|
