mirror of
https://github.com/guanzhi/GmSSL.git
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89 lines
2.0 KiB
C
89 lines
2.0 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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#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(SM4_T[(uint8_t)x4], 8); \
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x4 >>= 8; \
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x0 ^= t0; \
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t0 = ROL32(SM4_T[(uint8_t)x4], 16); \
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x4 >>= 8; \
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x0 ^= t0; \
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t0 = ROL32(SM4_T[(uint8_t)x4], 24); \
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x4 >>= 8; \
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x0 ^= t0; \
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t1 = SM4_T[x4]; \
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x4 = x0 ^ t1
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#define ROUND ROUND_TBOX
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void sm4_encrypt(const SM4_KEY *key, const unsigned char in[16], unsigned char out[16])
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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 sm4_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
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size_t blocks, const SM4_KEY *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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