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