/* SPDX-License-Identifier: GPL-2.0 */ /* * Common values for the SM4 algorithm * Copyright (C) 2018 ARM Limited or its affiliates. * Copyright (c) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com> */ #ifndef _CRYPTO_SM4_H #define _CRYPTO_SM4_H #include <linux/types.h> #include <linux/crypto.h> #define SM4_KEY_SIZE 16 #define SM4_BLOCK_SIZE 16 #define SM4_RKEY_WORDS 32 struct sm4_ctx { u32 rkey_enc[SM4_RKEY_WORDS]; u32 rkey_dec[SM4_RKEY_WORDS]; }; /** * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016 * @ctx: The location where the computed key will be stored. * @in_key: The supplied key. * @key_len: The length of the supplied key. * * Returns 0 on success. The function fails only if an invalid key size (or * pointer) is supplied. */ int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key, unsigned int key_len); /** * sm4_crypt_block - Encrypt or decrypt a single SM4 block * @rk: The rkey_enc for encrypt or rkey_dec for decrypt * @out: Buffer to store output data * @in: Buffer containing the input data */ void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in); #endif