1 /* SPDX-License-Identifier: GPL-2.0 */
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>
12 #include <linux/types.h>
13 #include <linux/crypto.h>
15 #define SM4_KEY_SIZE 16
16 #define SM4_BLOCK_SIZE 16
17 #define SM4_RKEY_WORDS 32
19 struct crypto_sm4_ctx {
20 u32 rkey_enc[SM4_RKEY_WORDS];
21 u32 rkey_dec[SM4_RKEY_WORDS];
25 * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016
26 * @ctx: The location where the computed key will be stored.
27 * @in_key: The supplied key.
28 * @key_len: The length of the supplied key.
30 * Returns 0 on success. The function fails only if an invalid key size (or
31 * pointer) is supplied.
33 int sm4_expandkey(struct crypto_sm4_ctx *ctx, const u8 *in_key,
34 unsigned int key_len);
37 * sm4_crypt_block - Encrypt or decrypt a single SM4 block
38 * @rk: The rkey_enc for encrypt or rkey_dec for decrypt
39 * @out: Buffer to store output data
40 * @in: Buffer containing the input data
42 void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
44 int crypto_sm4_set_key(struct crypto_tfm *tfm, const u8 *in_key,
45 unsigned int key_len);
46 void crypto_sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in);
47 void crypto_sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in);