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
19struct des_ctx {
20 u32 expkey[DES_EXPKEY_WORDS];
21};
22
23struct des3_ede_ctx {
24 u32 expkey[DES3_EDE_EXPKEY_WORDS];
25};
26
27void des_encrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
28void des_decrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
29
30void des3_ede_encrypt(const struct des3_ede_ctx *dctx, u8 *dst, const u8 *src);
31void 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 */
42int 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 */
54int des3_ede_expand_key(struct des3_ede_ctx *ctx, const u8 *key,
55 unsigned int keylen);
56
57#endif /* __CRYPTO_DES_H */
58

source code of linux/include/crypto/des.h