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
|
/* $OpenBSD: tcfs_cipher_TDES.c,v 1.5 2000/06/18 19:08:44 provos Exp $ */
/*
* Copyright 2000 The TCFS Project at http://tcfs.dia.unisa.it/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/md5k.h>
#include <miscfs/tcfs/tcfs_cipher.h>
#include <crypto/des_locl.h>
#include <crypto/des.h>
/* EDE Triple-DES with K1, K2 and K3 */
void *
TDES_init_key (char *key)
{
des_key_schedule *ks;
char dkey[TDES_KEYSIZE];
char digest[16];
MD5_CTX ctx;
int i;
/* Fold the bigger key into a Triple-DES suitable one */
bcopy (key, dkey, sizeof(dkey));
MD5Init(&ctx);
MD5Update(&ctx, key, KEYSIZE);
MD5Final(digest, &ctx);
for (i = 0; i < sizeof(dkey); i++)
dkey[i] ^= digest[i % 16];
ks = (des_key_schedule *)malloc (3 * sizeof (des_key_schedule),
M_FREE, M_NOWAIT);
if (!ks)
return NULL;
des_set_key ((des_cblock *) dkey, ks[0]);
des_set_key ((des_cblock *)(dkey + 8), ks[1]);
des_set_key ((des_cblock *)(dkey + 16), ks[2]);
bzero(dkey, sizeof(dkey));
bzero(digest, sizeof(digest));
return (void *)ks;
}
void
TDES_cleanup_key(void *k)
{
/* tcfs_keytab_dispnode does it
free((des_key_schedule*)k,M_FREE);
*/
}
void
TDES_encrypt(char *block, int nb, void *key)
{
u_int32_t * xi;
int i;
char *tmp;
des_key_schedule *ks = (des_key_schedule *)key;
xi = (u_int32_t *)block;
tmp = block;
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[2], ks[1], ks[0], DES_ENCRYPT);
tmp += 8;
for (i = 1;i < nb/8; i++) {
*(xi+2) ^= *xi;
*(xi+3) ^= *(xi + 1);
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[2], ks[1], ks[0], DES_ENCRYPT);
tmp += 8;
xi += 2;
}
}
void
TDES_decrypt(char *block, int nb, void *key)
{
u_int32_t * xi, xo[2], xa[2];
int i;
char *tmp;
des_key_schedule *ks = (des_key_schedule *)key;
xi = (u_int32_t *)block;
tmp = block;
xo[0] = *xi; xo[1] = *(xi+1);
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[0], ks[1], ks[2], DES_DECRYPT);
tmp += 8;
xi = (u_int32_t *)tmp;
for (i = 1;i < nb/8; i++) {
xa[0] = *xi; xa[1] = *(xi+1);
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[0], ks[1], ks[2], DES_DECRYPT);
*(xi) ^= xo[0];
*(xi+1)^= xo[1];
xo[0] = xa[0];
xo[1] = xa[1];
tmp += 8;
xi += 2;
}
}
|
