include/crypto/sm4.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002
0003 /*
0004  * Common values for the SM4 algorithm
0005  * Copyright (C) 2018 ARM Limited or its affiliates.
0006  * Copyright (c) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
0007  */
0008
0009 #ifndef _CRYPTO_SM4_H
0010 #define _CRYPTO_SM4_H
0011
0012 #include <linux/types.h>
0013 #include <linux/crypto.h>
0014
0015 #define SM4_KEY_SIZE    16
0016 #define SM4_BLOCK_SIZE  16
0017 #define SM4_RKEY_WORDS  32
0018
0019 struct sm4_ctx {
0020     u32 rkey_enc[SM4_RKEY_WORDS];
0021     u32 rkey_dec[SM4_RKEY_WORDS];
0022 };
0023
0024 extern const u32 crypto_sm4_fk[];
0025 extern const u32 crypto_sm4_ck[];
0026 extern const u8 crypto_sm4_sbox[];
0027
0028 /**
0029  * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016
0030  * @ctx:    The location where the computed key will be stored.
0031  * @in_key: The supplied key.
0032  * @key_len:    The length of the supplied key.
0033  *
0034  * Returns 0 on success. The function fails only if an invalid key size (or
0035  * pointer) is supplied.
0036  */
0037 int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key,
0038               unsigned int key_len);
0039
0040 /**
0041  * sm4_crypt_block - Encrypt or decrypt a single SM4 block
0042  * @rk:     The rkey_enc for encrypt or rkey_dec for decrypt
0043  * @out:    Buffer to store output data
0044  * @in:     Buffer containing the input data
0045  */
0046 void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
0047
0048 #endif