1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | |
3 | /* |
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> |
7 | */ |
8 | |
9 | #ifndef _CRYPTO_SM4_H |
10 | #define _CRYPTO_SM4_H |
11 | |
12 | #include <linux/types.h> |
13 | #include <linux/crypto.h> |
14 | |
15 | #define SM4_KEY_SIZE 16 |
16 | #define SM4_BLOCK_SIZE 16 |
17 | #define SM4_RKEY_WORDS 32 |
18 | |
19 | struct sm4_ctx { |
20 | u32 rkey_enc[SM4_RKEY_WORDS]; |
21 | u32 rkey_dec[SM4_RKEY_WORDS]; |
22 | }; |
23 | |
24 | extern const u32 crypto_sm4_fk[]; |
25 | extern const u32 crypto_sm4_ck[]; |
26 | extern const u8 crypto_sm4_sbox[]; |
27 | |
28 | /** |
29 | * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016 |
30 | * @ctx: The location where the computed key will be stored. |
31 | * @in_key: The supplied key. |
32 | * @key_len: The length of the supplied key. |
33 | * |
34 | * Returns 0 on success. The function fails only if an invalid key size (or |
35 | * pointer) is supplied. |
36 | */ |
37 | int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key, |
38 | unsigned int key_len); |
39 | |
40 | /** |
41 | * sm4_crypt_block - Encrypt or decrypt a single SM4 block |
42 | * @rk: The rkey_enc for encrypt or rkey_dec for decrypt |
43 | * @out: Buffer to store output data |
44 | * @in: Buffer containing the input data |
45 | */ |
46 | void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in); |
47 | |
48 | #endif |
49 | |