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 
des_setkey(struct crypto_tfm * tfm,const u8 * key,unsigned int keylen)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 
crypto_des_encrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)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 
crypto_des_decrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)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 
des3_ede_setkey(struct crypto_tfm * tfm,const u8 * key,unsigned int keylen)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 
crypto_des3_ede_encrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)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 
crypto_des3_ede_decrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)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 
des_generic_mod_init(void)115 static int __init des_generic_mod_init(void)
116 {
117 	return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
118 }
119 
des_generic_mod_fini(void)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