mirror of
https://github.com/guanzhi/GmSSL.git
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80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <gmssl/sm4.h>
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#include <gmssl/endian.h>
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#include "sm4_lcl.h"
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static uint32_t FK[4] = {
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0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc,
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};
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static uint32_t CK[32] = {
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0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
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0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
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0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
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0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
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0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
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0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
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0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
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0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279,
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};
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#define L32_(x) \
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((x) ^ \
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ROL32((x), 13) ^ \
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ROL32((x), 23))
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#define ENC_ROUND(x0, x1, x2, x3, x4, i) \
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x4 = x1 ^ x2 ^ x3 ^ *(CK + i); \
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x4 = S32(x4); \
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x4 = x0 ^ L32_(x4); \
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*(rk + i) = x4
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#define DEC_ROUND(x0, x1, x2, x3, x4, i) \
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x4 = x1 ^ x2 ^ x3 ^ *(CK + i); \
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x4 = S32(x4); \
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x4 = x0 ^ L32_(x4); \
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*(rk + 31 - i) = x4
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void sm4_set_encrypt_key(SM4_KEY *key, const uint8_t user_key[16])
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{
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uint32_t *rk = key->rk;
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uint32_t x0, x1, x2, x3, x4;
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x0 = GETU32(user_key ) ^ FK[0];
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x1 = GETU32(user_key + 4) ^ FK[1];
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x2 = GETU32(user_key + 8) ^ FK[2];
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x3 = GETU32(user_key + 12) ^ FK[3];
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#define ROUND ENC_ROUND
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ROUNDS(x0, x1, x2, x3, x4);
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#undef ROUND
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x0 = x1 = x2 = x3 = x4 = 0;
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}
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void sm4_set_decrypt_key(SM4_KEY *key, const uint8_t user_key[16])
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{
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uint32_t *rk = key->rk;
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uint32_t x0, x1, x2, x3, x4;
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x0 = GETU32(user_key ) ^ FK[0];
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x1 = GETU32(user_key + 4) ^ FK[1];
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x2 = GETU32(user_key + 8) ^ FK[2];
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x3 = GETU32(user_key + 12) ^ FK[3];
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#define ROUND DEC_ROUND
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ROUNDS(x0, x1, x2, x3, x4);
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#undef ROUND
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x0 = x1 = x2 = x3 = x4 = 0;
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}
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