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 /**
25  * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016
26  * @ctx:	The location where the computed key will be stored.
27  * @in_key:	The supplied key.
28  * @key_len:	The length of the supplied key.
29  *
30  * Returns 0 on success. The function fails only if an invalid key size (or
31  * pointer) is supplied.
32  */
33 int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key,
34 			  unsigned int key_len);
35 
36 /**
37  * sm4_crypt_block - Encrypt or decrypt a single SM4 block
38  * @rk:		The rkey_enc for encrypt or rkey_dec for decrypt
39  * @out:	Buffer to store output data
40  * @in: 	Buffer containing the input data
41  */
42 void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
43 
44 #endif
45