mirror of
https://github.com/guanzhi/GmSSL.git
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134 lines
4.2 KiB
C
134 lines
4.2 KiB
C
/* ====================================================================
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* Copyright (c) 2014 - 2017 The GmSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the GmSSL Project.
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* (http://gmssl.org/)"
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*
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* 4. The name "GmSSL Project" must not be used to endorse or promote
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* products derived from this software without prior written
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* permission. For written permission, please contact
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* guanzhi1980@gmail.com.
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*
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* 5. Products derived from this software may not be called "GmSSL"
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* nor may "GmSSL" appear in their names without prior written
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* permission of the GmSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the GmSSL Project
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* (http://gmssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#include <openssl/sms4.h>
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#include "internal/rotate.h"
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#include "modes_lcl.h"
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#include "sms4_lcl.h"
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#define L32(x) \
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((x) ^ \
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ROL32((x), 2) ^ \
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ROL32((x), 10) ^ \
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ROL32((x), 18) ^ \
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ROL32((x), 24))
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#define ROUND_SBOX(x0, x1, x2, x3, x4, i) \
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x4 = x1 ^ x2 ^ x3 ^ *(rk + i); \
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x4 = S32(x4); \
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x4 = x0 ^ L32(x4)
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#define ROUND_TBOX(x0, x1, x2, x3, x4, i) \
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x4 = x1 ^ x2 ^ x3 ^ *(rk + i); \
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t0 = ROL32(SMS4_T[(uint8_t)x4], 8); \
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x4 >>= 8; \
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x0 ^= t0; \
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t0 = ROL32(SMS4_T[(uint8_t)x4], 16); \
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x4 >>= 8; \
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x0 ^= t0; \
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t0 = ROL32(SMS4_T[(uint8_t)x4], 24); \
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x4 >>= 8; \
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x0 ^= t0; \
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t1 = SMS4_T[x4]; \
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x4 = x0 ^ t1
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#define ROUND_DBOX(x0, x1, x2, x3, x4, i) \
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x4 = x1 ^ x2 ^ x3 ^ *(rk + i); \
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x4 = x0 ^ SMS4_D[(uint16_t)(x4 >> 16)] ^ \
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ROL32(SMS4_D[(uint16_t)x4], 16)
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#define ROUND ROUND_TBOX
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void sms4_encrypt(const unsigned char in[16], unsigned char out[16], const sms4_key_t *key)
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{
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const uint32_t *rk = key->rk;
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uint32_t x0, x1, x2, x3, x4;
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uint32_t t0, t1;
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x0 = GETU32(in );
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x1 = GETU32(in + 4);
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x2 = GETU32(in + 8);
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x3 = GETU32(in + 12);
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ROUNDS(x0, x1, x2, x3, x4);
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PUTU32(out , x0);
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PUTU32(out + 4, x4);
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PUTU32(out + 8, x3);
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PUTU32(out + 12, x2);
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}
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/* caller make sure counter not overflow */
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void sms4_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
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size_t blocks, const sms4_key_t *key, const unsigned char iv[16])
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{
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const uint32_t *rk = key->rk;
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unsigned int c0 = GETU32(iv );
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unsigned int c1 = GETU32(iv + 4);
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unsigned int c2 = GETU32(iv + 8);
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unsigned int c3 = GETU32(iv + 12);
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uint32_t x0, x1, x2, x3, x4;
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uint32_t t0, t1;
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while (blocks--) {
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x0 = c0;
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x1 = c1;
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x2 = c2;
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x3 = c3;
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ROUNDS(x0, x1, x2, x3, x4);
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PUTU32(out , GETU32(in ) ^ x0);
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PUTU32(out + 4, GETU32(in + 4) ^ x4);
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PUTU32(out + 8, GETU32(in + 8) ^ x3);
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PUTU32(out + 12, GETU32(in + 12) ^ x2);
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in += 16;
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out += 16;
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c3++;
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}
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}
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