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
|
/*
* Copyright (C) 2010 Tobias Brunner
* Copyright (C) 2005-2007 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup diffie_hellman diffie_hellman
* @{ @ingroup crypto
*/
#ifndef DIFFIE_HELLMAN_H_
#define DIFFIE_HELLMAN_H_
typedef enum diffie_hellman_group_t diffie_hellman_group_t;
typedef struct diffie_hellman_t diffie_hellman_t;
typedef struct diffie_hellman_params_t diffie_hellman_params_t;
#include <library.h>
/**
* Diffie-Hellman group.
*
* The modulus (or group) to use for a Diffie-Hellman calculation.
* See IKEv2 RFC 3.3.2 and RFC 3526.
*
* ECP groups are defined in RFC 4753 and RFC 5114.
* ECC Brainpool groups are defined in RFC 6954.
*/
enum diffie_hellman_group_t {
MODP_NONE = 0,
MODP_768_BIT = 1,
MODP_1024_BIT = 2,
MODP_1536_BIT = 5,
MODP_2048_BIT = 14,
MODP_3072_BIT = 15,
MODP_4096_BIT = 16,
MODP_6144_BIT = 17,
MODP_8192_BIT = 18,
ECP_256_BIT = 19,
ECP_384_BIT = 20,
ECP_521_BIT = 21,
MODP_1024_160 = 22,
MODP_2048_224 = 23,
MODP_2048_256 = 24,
ECP_192_BIT = 25,
ECP_224_BIT = 26,
ECP_224_BP = 27,
ECP_256_BP = 28,
ECP_384_BP = 29,
ECP_512_BP = 30,
/** insecure NULL diffie hellman group for testing, in PRIVATE USE */
MODP_NULL = 1024,
/** MODP group with custom generator/prime */
MODP_CUSTOM = 1025,
/** Parameters defined by IEEE 1363.1, in PRIVATE USE */
NTRU_112_BIT = 1030,
NTRU_128_BIT = 1031,
NTRU_192_BIT = 1032,
NTRU_256_BIT = 1033
};
/**
* enum name for diffie_hellman_group_t.
*/
extern enum_name_t *diffie_hellman_group_names;
/**
* Implementation of the Diffie-Hellman algorithm, as in RFC2631.
*/
struct diffie_hellman_t {
/**
* Returns the shared secret of this diffie hellman exchange.
*
* Space for returned secret is allocated and must be freed by the caller.
*
* @param secret shared secret will be written into this chunk
* @return SUCCESS, FAILED if not both DH values are set
*/
status_t (*get_shared_secret) (diffie_hellman_t *this, chunk_t *secret);
/**
* Sets the public value of partner.
*
* Chunk gets cloned and can be destroyed afterwards.
*
* @param value public value of partner
*/
void (*set_other_public_value) (diffie_hellman_t *this, chunk_t value);
/**
* Gets the own public value to transmit.
*
* Space for returned chunk is allocated and must be freed by the caller.
*
* @param value public value of caller is stored at this location
*/
void (*get_my_public_value) (diffie_hellman_t *this, chunk_t *value);
/**
* Get the DH group used.
*
* @return DH group set in construction
*/
diffie_hellman_group_t (*get_dh_group) (diffie_hellman_t *this);
/**
* Destroys a diffie_hellman_t object.
*/
void (*destroy) (diffie_hellman_t *this);
};
/**
* Parameters for a specific diffie hellman group.
*/
struct diffie_hellman_params_t {
/**
* The prime of the group
*/
const chunk_t prime;
/**
* Generator of the group
*/
const chunk_t generator;
/**
* Exponent length to use
*/
size_t exp_len;
/**
* Prime order subgroup; for MODP Groups 22-24
*/
const chunk_t subgroup;
};
/**
* Initialize diffie hellman parameters during startup.
*/
void diffie_hellman_init();
/**
* Get the parameters associated with the specified diffie hellman group.
*
* Before calling this method, use diffie_hellman_init() to initialize the
* DH group table. This is usually done by library_init().
*
* @param group DH group
* @return The parameters or NULL, if the group is not supported
*/
diffie_hellman_params_t *diffie_hellman_get_params(diffie_hellman_group_t group);
/**
* Check if a given DH group is an ECDH group
*
* @param group group to check
* @return TUE if group is an ECP group
*/
bool diffie_hellman_group_is_ec(diffie_hellman_group_t group);
#endif /** DIFFIE_HELLMAN_H_ @}*/
|
