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
19static 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
37static 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
44static 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
51static 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
69static 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
77static 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
85static 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
115static int __init des_generic_mod_init(void)
116{
117	return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
118}
119
120static void __exit des_generic_mod_fini(void)
121{
122	crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs));
123}
124
125subsys_initcall(des_generic_mod_init);
126module_exit(des_generic_mod_fini);
127
128MODULE_LICENSE("GPL");
129MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
130MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>");
131MODULE_ALIAS_CRYPTO("des");
132MODULE_ALIAS_CRYPTO("des-generic");
133MODULE_ALIAS_CRYPTO("des3_ede");
134MODULE_ALIAS_CRYPTO("des3_ede-generic");
135