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(ctx: 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(ctx: 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(ctx: 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(ctx: 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(algs: des_algs, ARRAY_SIZE(des_algs)); |
118 | } |
119 | |
120 | static void __exit des_generic_mod_fini(void) |
121 | { |
122 | crypto_unregister_algs(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 | |