1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * DES & Triple DES EDE Cipher Algorithms.
7 * Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
10 #include <asm/byteorder.h>
11 #include <linux/bitops.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/errno.h>
15 #include <linux/crypto.h>
17 #include <crypto/internal/des.h>
19 static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
22 struct des_ctx *dctx = crypto_tfm_ctx(tfm);
25 err = des_expand_key(dctx, key, keylen);
27 if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
34 memset(dctx, 0, sizeof(*dctx));
35 crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
40 static void crypto_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
42 const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
44 des_encrypt(dctx, dst, src);
47 static void crypto_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
49 const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
51 des_decrypt(dctx, dst, src);
54 int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key,
59 des_ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
60 dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
61 des_ekey(expkey, key);
65 EXPORT_SYMBOL_GPL(__des3_ede_setkey);
67 static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
70 struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
73 err = des3_ede_expand_key(dctx, key, keylen);
75 if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
82 memset(dctx, 0, sizeof(*dctx));
83 crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
88 static void crypto_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst,
91 const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
93 des3_ede_encrypt(dctx, dst, src);
96 static void crypto_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst,
99 const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
101 des3_ede_decrypt(dctx, dst, src);
104 static struct crypto_alg des_algs[2] = { {
106 .cra_driver_name = "des-generic",
108 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
109 .cra_blocksize = DES_BLOCK_SIZE,
110 .cra_ctxsize = sizeof(struct des_ctx),
111 .cra_module = THIS_MODULE,
112 .cra_u = { .cipher = {
113 .cia_min_keysize = DES_KEY_SIZE,
114 .cia_max_keysize = DES_KEY_SIZE,
115 .cia_setkey = des_setkey,
116 .cia_encrypt = crypto_des_encrypt,
117 .cia_decrypt = crypto_des_decrypt } }
119 .cra_name = "des3_ede",
120 .cra_driver_name = "des3_ede-generic",
122 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
123 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
124 .cra_ctxsize = sizeof(struct des3_ede_ctx),
125 .cra_module = THIS_MODULE,
126 .cra_u = { .cipher = {
127 .cia_min_keysize = DES3_EDE_KEY_SIZE,
128 .cia_max_keysize = DES3_EDE_KEY_SIZE,
129 .cia_setkey = des3_ede_setkey,
130 .cia_encrypt = crypto_des3_ede_encrypt,
131 .cia_decrypt = crypto_des3_ede_decrypt } }
134 static int __init des_generic_mod_init(void)
136 return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
139 static void __exit des_generic_mod_fini(void)
141 crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs));
144 subsys_initcall(des_generic_mod_init);
145 module_exit(des_generic_mod_fini);
147 MODULE_LICENSE("GPL");
148 MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
149 MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>");
150 MODULE_ALIAS_CRYPTO("des");
151 MODULE_ALIAS_CRYPTO("des-generic");
152 MODULE_ALIAS_CRYPTO("des3_ede");
153 MODULE_ALIAS_CRYPTO("des3_ede-generic");