include/crypto/sm4.h

   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 /**
  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.
  29  *
  30  * Returns 0 on success. The function fails only if an invalid key size (or
  31  * pointer) is supplied.
  32  */
  33 int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key,
  34                           unsigned int key_len);
  35
  36 /**
  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
  41  */
  42 void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in);
  43
  44 #endif