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