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
|
/*
* ipsec_alg TWOFISH cipher stubs
*
* Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
*
* $Id: ipsec_alg_twofish.c,v 1.2 2004/03/22 21:53:19 as Exp $
*
* 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 <linux/config.h>
#include <linux/version.h>
/*
* special case: ipsec core modular with this static algo inside:
* must avoid MODULE magic for this file
*/
#if CONFIG_IPSEC_MODULE && CONFIG_IPSEC_ALG_TWOFISH
#undef MODULE
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h> /* printk() */
#include <linux/errno.h> /* error codes */
#include <linux/types.h> /* size_t */
#include <linux/string.h>
/* Check if __exit is defined, if not null it */
#ifndef __exit
#define __exit
#endif
/* Low freeswan header coupling */
#include "freeswan/ipsec_alg.h"
#include "libtwofish/twofish.h"
#include "libtwofish/twofish_cbc.h"
#define ESP_TWOFISH 253 /* from ipsec drafts */
/* 128, 192 or 256 */
#define ESP_TWOFISH_KEY_SZ_MIN 16 /* 128 bit secret key */
#define ESP_TWOFISH_KEY_SZ_MAX 32 /* 256 bit secret key */
#define ESP_TWOFISH_CBC_BLK_LEN 16 /* TWOFISH-CBC block size */
MODULE_AUTHOR("JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>");
static int debug=0;
MODULE_PARM(debug, "i");
static int test=0;
MODULE_PARM(test, "i");
static int excl=0;
MODULE_PARM(excl, "i");
static int keyminbits=0;
MODULE_PARM(keyminbits, "i");
static int keymaxbits=0;
MODULE_PARM(keymaxbits, "i");
static int _twofish_set_key(struct ipsec_alg_enc *alg, __u8 * key_e, const __u8 * key, size_t keysize) {
twofish_context *ctx=(twofish_context *)key_e;
if (debug > 0)
printk(KERN_DEBUG "klips_debug:_twofish_set_key:"
"key_e=%p key=%p keysize=%d\n",
key_e, key, keysize);
twofish_set_key(ctx, key, keysize);
return 0;
}
static int _twofish_cbc_encrypt(struct ipsec_alg_enc *alg, __u8 * key_e, __u8 * in, int ilen, const __u8 * iv, int encrypt) {
twofish_context *ctx=(twofish_context *)key_e;
if (debug > 0)
printk(KERN_DEBUG "klips_debug:_twofish_cbc_encrypt:"
"key_e=%p in=%p ilen=%d iv=%p encrypt=%d\n",
key_e, in, ilen, iv, encrypt);
twofish_cbc_encrypt(ctx, in, in, ilen, iv, encrypt);
return ilen;
}
static struct ipsec_alg_enc ipsec_alg_TWOFISH = {
ixt_version: IPSEC_ALG_VERSION,
ixt_module: THIS_MODULE,
ixt_refcnt: ATOMIC_INIT(0),
ixt_alg_type: IPSEC_ALG_TYPE_ENCRYPT,
ixt_alg_id: ESP_TWOFISH,
ixt_name: "twofish",
ixt_blocksize: ESP_TWOFISH_CBC_BLK_LEN,
ixt_keyminbits: ESP_TWOFISH_KEY_SZ_MIN * 8,
ixt_keymaxbits: ESP_TWOFISH_KEY_SZ_MAX * 8,
ixt_e_keylen: ESP_TWOFISH_KEY_SZ_MAX,
ixt_e_ctx_size: sizeof(twofish_context),
ixt_e_set_key: _twofish_set_key,
ixt_e_cbc_encrypt:_twofish_cbc_encrypt,
};
IPSEC_ALG_MODULE_INIT( ipsec_twofish_init )
{
int ret, test_ret;
if (keyminbits)
ipsec_alg_TWOFISH.ixt_keyminbits=keyminbits;
if (keymaxbits) {
ipsec_alg_TWOFISH.ixt_keymaxbits=keymaxbits;
if (keymaxbits*8>ipsec_alg_TWOFISH.ixt_keymaxbits)
ipsec_alg_TWOFISH.ixt_e_keylen=keymaxbits*8;
}
if (excl) ipsec_alg_TWOFISH.ixt_state |= IPSEC_ALG_ST_EXCL;
ret=register_ipsec_alg_enc(&ipsec_alg_TWOFISH);
printk("ipsec_twofish_init(alg_type=%d alg_id=%d name=%s): ret=%d\n",
ipsec_alg_TWOFISH.ixt_alg_type,
ipsec_alg_TWOFISH.ixt_alg_id,
ipsec_alg_TWOFISH.ixt_name, ret);
if (ret==0 && test) {
test_ret=ipsec_alg_test(
ipsec_alg_TWOFISH.ixt_alg_type,
ipsec_alg_TWOFISH.ixt_alg_id,
test);
printk("ipsec_twofish_init(alg_type=%d alg_id=%d): test_ret=%d\n",
ipsec_alg_TWOFISH.ixt_alg_type,
ipsec_alg_TWOFISH.ixt_alg_id,
ret);
}
return ret;
}
IPSEC_ALG_MODULE_EXIT( ipsec_twofish_fini )
{
unregister_ipsec_alg_enc(&ipsec_alg_TWOFISH);
return;
}
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
#endif
|
