1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * DES & Triple DES EDE Cipher Algorithms.
4  */
5 
6 #ifndef __CRYPTO_DES_H
7 #define __CRYPTO_DES_H
8 
9 #include <linux/types.h>
10 
11 #define DES_KEY_SIZE		8
12 #define DES_EXPKEY_WORDS	32
13 #define DES_BLOCK_SIZE		8
14 
15 #define DES3_EDE_KEY_SIZE	(3 * DES_KEY_SIZE)
16 #define DES3_EDE_EXPKEY_WORDS	(3 * DES_EXPKEY_WORDS)
17 #define DES3_EDE_BLOCK_SIZE	DES_BLOCK_SIZE
18 
19 struct des_ctx {
20 	u32 expkey[DES_EXPKEY_WORDS];
21 };
22 
23 struct des3_ede_ctx {
24 	u32 expkey[DES3_EDE_EXPKEY_WORDS];
25 };
26 
27 void des_encrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
28 void des_decrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
29 
30 void des3_ede_encrypt(const struct des3_ede_ctx *dctx, u8 *dst, const u8 *src);
31 void des3_ede_decrypt(const struct des3_ede_ctx *dctx, u8 *dst, const u8 *src);
32 
33 /**
34  * des_expand_key - Expand a DES input key into a key schedule
35  * @ctx: the key schedule
36  * @key: buffer containing the input key
37  * @len: size of the buffer contents
38  *
39  * Returns 0 on success, -EINVAL if the input key is rejected and -ENOKEY if
40  * the key is accepted but has been found to be weak.
41  */
42 int des_expand_key(struct des_ctx *ctx, const u8 *key, unsigned int keylen);
43 
44 /**
45  * des3_ede_expand_key - Expand a triple DES input key into a key schedule
46  * @ctx: the key schedule
47  * @key: buffer containing the input key
48  * @len: size of the buffer contents
49  *
50  * Returns 0 on success, -EINVAL if the input key is rejected and -ENOKEY if
51  * the key is accepted but has been found to be weak. Note that weak keys will
52  * be rejected (and -EINVAL will be returned) when running in FIPS mode.
53  */
54 int des3_ede_expand_key(struct des3_ede_ctx *ctx, const u8 *key,
55 			unsigned int keylen);
56 
57 #endif /* __CRYPTO_DES_H */
58