1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Cryptographic API.
4 *
5 * DES & Triple DES EDE Cipher Algorithms.
6 *
7 * Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
8 */
9
10 #include <asm/byteorder.h>
11 #include <crypto/algapi.h>
12 #include <linux/bitops.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16
17 #include <crypto/internal/des.h>
18
19 static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
20 unsigned int keylen)
21 {
22 struct des_ctx *dctx = crypto_tfm_ctx(tfm);
23 int err;
24
25 err = des_expand_key(dctx, key, keylen);
26 if (err == -ENOKEY) {
27 if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
28 err = -EINVAL;
29 else
30 err = 0;
31 }
32 if (err)
33 memset(dctx, 0, sizeof(*dctx));
34 return err;
35 }
36
37 static void crypto_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
38 {
39 const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
40
41 des_encrypt(dctx, dst, src);
42 }
43
44 static void crypto_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
45 {
46 const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
47
48 des_decrypt(dctx, dst, src);
49 }
50
51 static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
52 unsigned int keylen)
53 {
54 struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
55 int err;
56
57 err = des3_ede_expand_key(dctx, key, keylen);
58 if (err == -ENOKEY) {
59 if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
60 err = -EINVAL;
61 else
62 err = 0;
63 }
64 if (err)
65 memset(dctx, 0, sizeof(*dctx));
66 return err;
67 }
68
69 static void crypto_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst,
70 const u8 *src)
71 {
72 const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
73
74 des3_ede_encrypt(dctx, dst, src);
75 }
76
77 static void crypto_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst,
78 const u8 *src)
79 {
80 const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
81
82 des3_ede_decrypt(dctx, dst, src);
83 }
84
85 static struct crypto_alg des_algs[2] = { {
86 .cra_name = "des",
87 .cra_driver_name = "des-generic",
88 .cra_priority = 100,
89 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
90 .cra_blocksize = DES_BLOCK_SIZE,
91 .cra_ctxsize = sizeof(struct des_ctx),
92 .cra_module = THIS_MODULE,
93 .cra_u = { .cipher = {
94 .cia_min_keysize = DES_KEY_SIZE,
95 .cia_max_keysize = DES_KEY_SIZE,
96 .cia_setkey = des_setkey,
97 .cia_encrypt = crypto_des_encrypt,
98 .cia_decrypt = crypto_des_decrypt } }
99 }, {
100 .cra_name = "des3_ede",
101 .cra_driver_name = "des3_ede-generic",
102 .cra_priority = 100,
103 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
104 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
105 .cra_ctxsize = sizeof(struct des3_ede_ctx),
106 .cra_module = THIS_MODULE,
107 .cra_u = { .cipher = {
108 .cia_min_keysize = DES3_EDE_KEY_SIZE,
109 .cia_max_keysize = DES3_EDE_KEY_SIZE,
110 .cia_setkey = des3_ede_setkey,
111 .cia_encrypt = crypto_des3_ede_encrypt,
112 .cia_decrypt = crypto_des3_ede_decrypt } }
113 } };
114
115 static int __init des_generic_mod_init(void)
116 {
117 return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
118 }
119
120 static void __exit des_generic_mod_fini(void)
121 {
122 crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs));
123 }
124
125 subsys_initcall(des_generic_mod_init);
126 module_exit(des_generic_mod_fini);
127
128 MODULE_LICENSE("GPL");
129 MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
130 MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>");
131 MODULE_ALIAS_CRYPTO("des");
132 MODULE_ALIAS_CRYPTO("des-generic");
133 MODULE_ALIAS_CRYPTO("des3_ede");
134 MODULE_ALIAS_CRYPTO("des3_ede-generic");
135
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