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