des_generic.c
3.28 KB
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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API.
*
* DES & Triple DES EDE Cipher Algorithms.
*
* Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
*/
#include <asm/byteorder.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/crypto.h>
#include <crypto/internal/des.h>
static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct des_ctx *dctx = crypto_tfm_ctx(tfm);
int err;
err = des_expand_key(dctx, key, keylen);
if (err == -ENOKEY) {
if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
err = -EINVAL;
else
err = 0;
}
if (err)
memset(dctx, 0, sizeof(*dctx));
return err;
}
static void crypto_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
des_encrypt(dctx, dst, src);
}
static void crypto_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
des_decrypt(dctx, dst, src);
}
static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
int err;
err = des3_ede_expand_key(dctx, key, keylen);
if (err == -ENOKEY) {
if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
err = -EINVAL;
else
err = 0;
}
if (err)
memset(dctx, 0, sizeof(*dctx));
return err;
}
static void crypto_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst,
const u8 *src)
{
const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
des3_ede_encrypt(dctx, dst, src);
}
static void crypto_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst,
const u8 *src)
{
const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
des3_ede_decrypt(dctx, dst, src);
}
static struct crypto_alg des_algs[2] = { {
.cra_name = "des",
.cra_driver_name = "des-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct des_ctx),
.cra_module = THIS_MODULE,
.cra_u = { .cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey = des_setkey,
.cia_encrypt = crypto_des_encrypt,
.cia_decrypt = crypto_des_decrypt } }
}, {
.cra_name = "des3_ede",
.cra_driver_name = "des3_ede-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct des3_ede_ctx),
.cra_module = THIS_MODULE,
.cra_u = { .cipher = {
.cia_min_keysize = DES3_EDE_KEY_SIZE,
.cia_max_keysize = DES3_EDE_KEY_SIZE,
.cia_setkey = des3_ede_setkey,
.cia_encrypt = crypto_des3_ede_encrypt,
.cia_decrypt = crypto_des3_ede_decrypt } }
} };
static int __init des_generic_mod_init(void)
{
return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
}
static void __exit des_generic_mod_fini(void)
{
crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs));
}
subsys_initcall(des_generic_mod_init);
module_exit(des_generic_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>");
MODULE_ALIAS_CRYPTO("des");
MODULE_ALIAS_CRYPTO("des-generic");
MODULE_ALIAS_CRYPTO("des3_ede");
MODULE_ALIAS_CRYPTO("des3_ede-generic");