1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 /*
4 * Common values for the SM4 algorithm
5 * Copyright (C) 2018 ARM Limited or its affiliates.
6 * Copyright (c) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
7 */
8
9 #ifndef _CRYPTO_SM4_H
10 #define _CRYPTO_SM4_H
11
12 #include <linux/types.h>
13 #include <linux/crypto.h>
14
15 #define SM4_KEY_SIZE 16
16 #define SM4_BLOCK_SIZE 16
17 #define SM4_RKEY_WORDS 32
18
19 struct sm4_ctx {
20 u32 rkey_enc[SM4_RKEY_WORDS];
21 u32 rkey_dec[SM4_RKEY_WORDS];
22 };
23
24 extern const u32 crypto_sm4_fk[];
25 extern const u32 crypto_sm4_ck[];
26 extern const u8 crypto_sm4_sbox[];
27
28 /**
29 * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016
30 * @ctx: The location where the computed key will be stored.
31 * @in_key: The supplied key.
32 * @key_len: The length of the supplied key.
33 *
34 * Returns 0 on success. The function fails only if an invalid key size (or
35 * pointer) is supplied.
36 */
37 int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key,
38 unsigned int key_len);
39
40 /**
41 * sm4_crypt_block - Encrypt or decrypt a single SM4 block
42 * @rk: The rkey_enc for encrypt or rkey_dec for decrypt
43 * @out: Buffer to store output data
44 * @in: Buffer containing the input data
45 */
46 void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
47
48 #endif
49
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