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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
/*
* Cryptographic API.
*
* z990 implementation of the DES Cipher Algorithm.
*
* Copyright (c) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Thomas Spatzier (tspat@de.ibm.com)
*
*
* 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.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
#include "crypt_z990.h"
#include "crypto_des.h"
#define DES_BLOCK_SIZE 8
#define DES_KEY_SIZE 8
#define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE)
#define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE
#define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE)
#define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE
struct crypt_z990_des_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES_KEY_SIZE];
};
struct crypt_z990_des3_128_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_128_KEY_SIZE];
};
struct crypt_z990_des3_192_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_192_KEY_SIZE];
};
static int
des_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
{
struct crypt_z990_des_ctx *dctx;
int ret;
dctx = ctx;
//test if key is valid (not a weak key)
ret = crypto_des_check_key(key, keylen, flags);
if (ret == 0){
memcpy(dctx->key, key, keylen);
}
return ret;
}
static void
des_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_z990_des_ctx *dctx;
dctx = ctx;
crypt_z990_km(KM_DEA_ENCRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
}
static void
des_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_z990_des_ctx *dctx;
dctx = ctx;
crypt_z990_km(KM_DEA_DECRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
}
static struct crypto_alg des_alg = {
.cra_name = "des",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_z990_des_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(des_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey = des_setkey,
.cia_encrypt = des_encrypt,
.cia_decrypt = des_decrypt } }
};
/*
* RFC2451:
*
* For DES-EDE3, there is no known need to reject weak or
* complementation keys. Any weakness is obviated by the use of
* multiple keys.
*
* However, if the two independent 64-bit keys are equal,
* then the DES3 operation is simply the same as DES.
* Implementers MUST reject keys that exhibit this property.
*
*/
static int
des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
{
int i, ret;
struct crypt_z990_des3_128_ctx *dctx;
const u8* temp_key = key;
dctx = ctx;
if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE))) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
return -EINVAL;
}
for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) {
ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
if (ret < 0)
return ret;
}
memcpy(dctx->key, key, keylen);
return 0;
}
static void
des3_128_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_z990_des3_128_ctx *dctx;
dctx = ctx;
crypt_z990_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
}
static void
des3_128_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_z990_des3_128_ctx *dctx;
dctx = ctx;
crypt_z990_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
}
static struct crypto_alg des3_128_alg = {
.cra_name = "des3_ede128",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES3_128_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_z990_des3_128_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = DES3_128_KEY_SIZE,
.cia_max_keysize = DES3_128_KEY_SIZE,
.cia_setkey = des3_128_setkey,
.cia_encrypt = des3_128_encrypt,
.cia_decrypt = des3_128_decrypt } }
};
/*
* RFC2451:
*
* For DES-EDE3, there is no known need to reject weak or
* complementation keys. Any weakness is obviated by the use of
* multiple keys.
*
* However, if the first two or last two independent 64-bit keys are
* equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
* same as DES. Implementers MUST reject keys that exhibit this
* property.
*
*/
static int
des3_192_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
{
int i, ret;
struct crypt_z990_des3_192_ctx *dctx;
const u8* temp_key;
dctx = ctx;
temp_key = key;
if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
DES_KEY_SIZE))) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
return -EINVAL;
}
for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) {
ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
if (ret < 0){
return ret;
}
}
memcpy(dctx->key, key, keylen);
return 0;
}
static void
des3_192_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_z990_des3_192_ctx *dctx;
dctx = ctx;
crypt_z990_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
}
static void
des3_192_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_z990_des3_192_ctx *dctx;
dctx = ctx;
crypt_z990_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
}
static struct crypto_alg des3_192_alg = {
.cra_name = "des3_ede",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES3_192_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_z990_des3_192_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = DES3_192_KEY_SIZE,
.cia_max_keysize = DES3_192_KEY_SIZE,
.cia_setkey = des3_192_setkey,
.cia_encrypt = des3_192_encrypt,
.cia_decrypt = des3_192_decrypt } }
};
static int
init(void)
{
int ret;
if (!crypt_z990_func_available(KM_DEA_ENCRYPT) ||
!crypt_z990_func_available(KM_TDEA_128_ENCRYPT) ||
!crypt_z990_func_available(KM_TDEA_192_ENCRYPT)){
return -ENOSYS;
}
ret = 0;
ret |= (crypto_register_alg(&des_alg) == 0)? 0:1;
ret |= (crypto_register_alg(&des3_128_alg) == 0)? 0:2;
ret |= (crypto_register_alg(&des3_192_alg) == 0)? 0:4;
if (ret){
crypto_unregister_alg(&des3_192_alg);
crypto_unregister_alg(&des3_128_alg);
crypto_unregister_alg(&des_alg);
return -EEXIST;
}
printk(KERN_INFO "crypt_z990: des_z990 loaded.\n");
return 0;
}
static void __exit
fini(void)
{
crypto_unregister_alg(&des3_192_alg);
crypto_unregister_alg(&des3_128_alg);
crypto_unregister_alg(&des_alg);
}
module_init(init);
module_exit(fini);
MODULE_ALIAS("des");
MODULE_ALIAS("des3_ede");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
|
