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118 lines (104 loc) · 3.93 KB
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/* ====================================================================
* Copyright (c) 2014 - 2019 The GmSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the GmSSL Project.
* (http://gmssl.org/)"
*
* 4. The name "GmSSL Project" must not be used to endorse or promote
* products derived from this software without prior written
* permission. For written permission, please contact
* guanzhi1980@gmail.com.
*
* 5. Products derived from this software may not be called "GmSSL"
* nor may "GmSSL" appear in their names without prior written
* permission of the GmSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the GmSSL Project
* (http://gmssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <gmssl/sm4.h>
#include <gmssl/endian.h>
#include "sm4_lcl.h"
static uint32_t FK[4] = {
0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc,
};
static uint32_t CK[32] = {
0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279,
};
#define L32_(x) \
((x) ^ \
ROL32((x), 13) ^ \
ROL32((x), 23))
#define ENC_ROUND(x0, x1, x2, x3, x4, i) \
x4 = x1 ^ x2 ^ x3 ^ *(CK + i); \
x4 = S32(x4); \
x4 = x0 ^ L32_(x4); \
*(rk + i) = x4
#define DEC_ROUND(x0, x1, x2, x3, x4, i) \
x4 = x1 ^ x2 ^ x3 ^ *(CK + i); \
x4 = S32(x4); \
x4 = x0 ^ L32_(x4); \
*(rk + 31 - i) = x4
void sm4_set_encrypt_key(SM4_KEY *key, const uint8_t user_key[16])
{
uint32_t *rk = key->rk;
uint32_t x0, x1, x2, x3, x4;
x0 = GETU32(user_key ) ^ FK[0];
x1 = GETU32(user_key + 4) ^ FK[1];
x2 = GETU32(user_key + 8) ^ FK[2];
x3 = GETU32(user_key + 12) ^ FK[3];
#define ROUND ENC_ROUND
ROUNDS(x0, x1, x2, x3, x4);
#undef ROUND
x0 = x1 = x2 = x3 = x4 = 0;
}
void sm4_set_decrypt_key(SM4_KEY *key, const uint8_t user_key[16])
{
uint32_t *rk = key->rk;
uint32_t x0, x1, x2, x3, x4;
x0 = GETU32(user_key ) ^ FK[0];
x1 = GETU32(user_key + 4) ^ FK[1];
x2 = GETU32(user_key + 8) ^ FK[2];
x3 = GETU32(user_key + 12) ^ FK[3];
#define ROUND DEC_ROUND
ROUNDS(x0, x1, x2, x3, x4);
#undef ROUND
x0 = x1 = x2 = x3 = x4 = 0;
}