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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
19struct 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 */
33int 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 */
42void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
43
44#endif