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127 lines (116 loc) · 4.04 KB
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/* ====================================================================
* Copyright (c) 2014 - 2017 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"
#define L32(x) \
((x) ^ \
ROL32((x), 2) ^ \
ROL32((x), 10) ^ \
ROL32((x), 18) ^ \
ROL32((x), 24))
#define ROUND_SBOX(x0, x1, x2, x3, x4, i) \
x4 = x1 ^ x2 ^ x3 ^ *(rk + i); \
x4 = S32(x4); \
x4 = x0 ^ L32(x4)
#define ROUND_TBOX(x0, x1, x2, x3, x4, i) \
x4 = x1 ^ x2 ^ x3 ^ *(rk + i); \
t0 = ROL32(SM4_T[(uint8_t)x4], 8); \
x4 >>= 8; \
x0 ^= t0; \
t0 = ROL32(SM4_T[(uint8_t)x4], 16); \
x4 >>= 8; \
x0 ^= t0; \
t0 = ROL32(SM4_T[(uint8_t)x4], 24); \
x4 >>= 8; \
x0 ^= t0; \
t1 = SM4_T[x4]; \
x4 = x0 ^ t1
#define ROUND ROUND_TBOX
void sm4_encrypt(const SM4_KEY *key, const unsigned char in[16], unsigned char out[16])
{
const uint32_t *rk = key->rk;
uint32_t x0, x1, x2, x3, x4;
uint32_t t0, t1;
x0 = GETU32(in );
x1 = GETU32(in + 4);
x2 = GETU32(in + 8);
x3 = GETU32(in + 12);
ROUNDS(x0, x1, x2, x3, x4);
PUTU32(out , x0);
PUTU32(out + 4, x4);
PUTU32(out + 8, x3);
PUTU32(out + 12, x2);
}
/* caller make sure counter not overflow */
void sm4_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
size_t blocks, const SM4_KEY *key, const unsigned char iv[16])
{
const uint32_t *rk = key->rk;
unsigned int c0 = GETU32(iv );
unsigned int c1 = GETU32(iv + 4);
unsigned int c2 = GETU32(iv + 8);
unsigned int c3 = GETU32(iv + 12);
uint32_t x0, x1, x2, x3, x4;
uint32_t t0, t1;
while (blocks--) {
x0 = c0;
x1 = c1;
x2 = c2;
x3 = c3;
ROUNDS(x0, x1, x2, x3, x4);
PUTU32(out , GETU32(in ) ^ x0);
PUTU32(out + 4, GETU32(in + 4) ^ x4);
PUTU32(out + 8, GETU32(in + 8) ^ x3);
PUTU32(out + 12, GETU32(in + 12) ^ x2);
in += 16;
out += 16;
c3++;
}
}