| /* 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 |
