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
|
/*
* Copyright (C) 2005-2006 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.
*/
#include "hmac_prf.h"
#include "hmac.h"
typedef struct private_hmac_prf_t private_hmac_prf_t;
/**
* Private data of a hma_prf_t object.
*/
struct private_hmac_prf_t {
/**
* Public hmac_prf_t interface.
*/
hmac_prf_t public;
/**
* Hmac to use for generation.
*/
hmac_t *hmac;
};
METHOD(prf_t, get_bytes, void,
private_hmac_prf_t *this, chunk_t seed, u_int8_t *buffer)
{
this->hmac->get_mac(this->hmac, seed, buffer);
}
METHOD(prf_t, allocate_bytes, void,
private_hmac_prf_t *this, chunk_t seed, chunk_t *chunk)
{
this->hmac->allocate_mac(this->hmac, seed, chunk);
}
METHOD(prf_t, get_block_size, size_t,
private_hmac_prf_t *this)
{
return this->hmac->get_block_size(this->hmac);
}
METHOD(prf_t, get_key_size, size_t,
private_hmac_prf_t *this)
{
/* for HMAC prfs, IKEv2 uses block size as key size */
return this->hmac->get_block_size(this->hmac);
}
METHOD(prf_t, set_key, void,
private_hmac_prf_t *this, chunk_t key)
{
this->hmac->set_key(this->hmac, key);
}
METHOD(prf_t, destroy, void,
private_hmac_prf_t *this)
{
this->hmac->destroy(this->hmac);
free(this);
}
/*
* Described in header.
*/
hmac_prf_t *hmac_prf_create(pseudo_random_function_t algo)
{
private_hmac_prf_t *this;
hmac_t *hmac;
switch (algo)
{
case PRF_HMAC_SHA1:
hmac = hmac_create(HASH_SHA1);
break;
case PRF_HMAC_MD5:
hmac = hmac_create(HASH_MD5);
break;
case PRF_HMAC_SHA2_256:
hmac = hmac_create(HASH_SHA256);
break;
case PRF_HMAC_SHA2_384:
hmac = hmac_create(HASH_SHA384);
break;
case PRF_HMAC_SHA2_512:
hmac = hmac_create(HASH_SHA512);
break;
default:
return NULL;
}
if (hmac == NULL)
{
return NULL;
}
INIT(this,
.public = {
.prf = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.get_block_size = _get_block_size,
.get_key_size = _get_key_size,
.set_key = _set_key,
.destroy = _destroy,
},
},
.hmac = hmac,
);
return &this->public;
}
|
