📄 desimprovement2.cpp
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/*===========================================================================================================
DES(Data Encryption Standard) Programming (C语言)
Author: tsp语音芯片
The openning date： 2006.12.02日
The closing date： 2006.12.07日
Compiler: microsoft visual c++ 6.0
============================================================================================================*/
//**********************************************************************************************************//
// the Area of Header //
//**********************************************************************************************************//
#include "stdio.h"
#include "defhead.h"
//**********************************************************************************************************//
// the Definition of Constant //
//**********************************************************************************************************//
/*initial permutation IP of the DATA*/
static ULONG8 DES_IP[] =
{
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7
};
/*final permutation IP^-1 of the combined DATA and KEY*/
static ULONG8 IP_[] =
{
40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25
};
/*expansion operation matrix*/
static ULONG8 E[] =
{
32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13,
12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21,
20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29,
28, 29, 30, 31, 32, 1
};
/* Initial Permutation of Key */
static ULONG8 PC1[] =
{
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4
};
/* Table - Shift */
static ULONG8 shift[16] =
{
1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};
/* Initial Permutation of Key */
static ULONG8 PC2[] =
{
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32
};
/*32-bit permutation function P used on the output of the S-boxes*/
static ULONG8 P32i[] =
{
16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25
};
/*The (in) famous s-boxes*/
static ULONG8 si[8][4][16] =
{
/* Table - s1 */
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,
/* Table - s2 */
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,
/* Table - s3 */
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,
/* Table - s4 */
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,
/* Table - s5 */
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,
/* Table - s6 */
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,
/* Table - s7 */
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,
/* Table - s8 */
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
};
//**********************************************************************************************************//
// the Definition of Globality //
//**********************************************************************************************************//
ULONG8 source_left_buf[32], source_right_buf[32], temp_buf[64];
ULONG8 key_left_buf[28], key_right_buf[28], key_tmp[64], key[48];
ULONG8 function_result[32];
ULONG8 DATAout[64];
//*********************************************************************************************************//
// the Program of DES_Encode //
//*********************************************************************************************************//
void DES_encode(ULONG8 *source, ULONG8 *inkey)
{
ULONG8 count,i,j,tmp1,tmp2;
//begin/* Convert from 8-byte data into 64-bit data */===================================================
for (i = 0; i < 8; i++)
{
temp_buf[8*i] = ((j = *(source + i)) / 128) % 2;
temp_buf[8*i+1] = (j / 64) % 2;
temp_buf[8*i+2] = (j / 32) % 2;
temp_buf[8*i+3] = (j / 16) % 2;
temp_buf[8*i+4] = (j / 8) % 2;
temp_buf[8*i+5] = (j / 4) % 2;
temp_buf[8*i+6] = (j / 2) % 2;
temp_buf[8*i+7] = j % 2;
}
//end/* Convert from 8-byte data into 64-bit data */=====================================================
/* Initial Permutation of Data */
for (i=0; i<32; i++)
{
source_left_buf[i] = temp_buf[DES_IP[i]-1];
source_right_buf[i] = temp_buf[DES_IP[i+32]-1];
}
//begin/* Convert from 8-byte data into 64-bit data */===================================================
for (i = 0; i < 8; i++)
{
temp_buf[8*i] = ((j = *(inkey + i)) / 128) % 2;
temp_buf[8*i+1] = (j / 64) % 2;
temp_buf[8*i+2] = (j / 32) % 2;
temp_buf[8*i+3] = (j / 16) % 2;
temp_buf[8*i+4] = (j / 8) % 2;
temp_buf[8*i+5] = (j / 4) % 2;
temp_buf[8*i+6] = (j / 2) % 2;
temp_buf[8*i+7] = j % 2;
}
//end/* Convert from 8-byte data into 64-bit data */=====================================================
/* Initial Permutation of Key */
for (i=0; i<28; i++)
{
key_left_buf[i] = temp_buf[PC1[i]-1];
key_right_buf[i] = temp_buf[PC1[i+28]-1];
}
for(count=1; count<17; count++)
{
//key begin========================================================================================//
for(j=0; j<shift[count-1]; j++)
{
tmp1 = key_left_buf[0];
tmp2 = key_right_buf[0];
for (i=0; i<27; i++) //循环左移
{
key_left_buf[i] = key_left_buf[i+1];
key_right_buf[i] = key_right_buf[i+1];
}
key_left_buf[27] = tmp1;
key_right_buf[27] = tmp2;
}
for(i=0; i<28; i++)//combine the key_left and key_right together
{
temp_buf[i] = key_left_buf[i];
temp_buf[i+28] = key_right_buf[i];
}
for(i=0; i<48; i++)//pc2置换
{
key[i] = temp_buf[PC2[i]-1];
}
//key end==========================================================================================//
for(i=0; i<48; i++)//Permute-E convert 32bits source_right into 48bits
{
temp_buf[i] =source_right_buf[E[i]-1];
}
/* temp_buf XOR key */
for (i=0; i<48; i++)
{
temp_buf[i] = temp_buf[i] ^ key[i];
}
for (i=0; i<8; i++)
{
tmp1 = si[i]
[temp_buf[i*6]*2+temp_buf[i*6+5]]
[temp_buf[i*6+1]*8+temp_buf[i*6+2]*4+temp_buf[i*6+3]*2+temp_buf[i*6+4]];
temp_buf[i*4]=(j = tmp1/8)%2;
temp_buf[i*4+1]=(j / 4)%2;
temp_buf[i*4+2]=(j / 2)%2;
temp_buf[i*4+3]=j % 2;
}
for (i=0; i<32; i++)
{
function_result[i] = temp_buf[P32i[i]-1] ^ source_left_buf[i];
if(count <= 15)
{
source_left_buf[i] = source_right_buf[i];
source_right_buf[i] = function_result[i];
}
}
}
for(i=0; i<32; i++)
{
temp_buf[i] = function_result[i];
temp_buf[i+32] = source_right_buf[i];
}
/* Inverse Initial Permutation */
for(i=0; i<64; i++)
{
DATAout[i] = temp_buf[IP_[i]-1];
}
for(i=0; i<8; i++)
{
for(j=0; j<8; j++)
{
DATAout[i] = 2*DATAout[i] + DATAout[i*8+j];
}
}
}
//*********************************************************************************************************//
// the Program of DES_Decode //
//*********************************************************************************************************//
void DES_decode(ULONG8 *source, ULONG8 *inkey)
{
ULONG8 count,i,j,tmp1,tmp2,tmp3;
//begin/* Convert from 8-byte data into 64-bit data */===================================================
for (i = 0; i < 8; i++)
{
temp_buf[8*i] = ((j = *(source + i)) / 128) % 2;
temp_buf[8*i+1] = (j / 64) % 2;
temp_buf[8*i+2] = (j / 32) % 2;
temp_buf[8*i+3] = (j / 16) % 2;
temp_buf[8*i+4] = (j / 8) % 2;
temp_buf[8*i+5] = (j / 4) % 2;
temp_buf[8*i+6] = (j / 2) % 2;
temp_buf[8*i+7] = j % 2;
}
//end/* Convert from 8-byte data into 64-bit data */=====================================================
/* Initial Permutation of Data */
for (i=0; i<32; i++)
{
source_left_buf[i] = temp_buf[DES_IP[i]-1];
source_right_buf[i] = temp_buf[DES_IP[i+32]-1];
}
//begin/* Convert from 8-byte data into 64-bit data */===================================================
for (i = 0; i < 8; i++)
{
key_tmp[8*i] = ((j = *(inkey + i)) / 128) % 2;
key_tmp[8*i+1] = (j / 64) % 2;
key_tmp[8*i+2] = (j / 32) % 2;
key_tmp[8*i+3] = (j / 16) % 2;
key_tmp[8*i+4] = (j / 8) % 2;
key_tmp[8*i+5] = (j / 4) % 2;
key_tmp[8*i+6] = (j / 2) % 2;
key_tmp[8*i+7] = j % 2;
}
//end/* Convert from 8-byte data into 64-bit data */=====================================================
for(count=1; count<17; count++)
{
/* Initial Permutation of Key */
for (i=0; i<28; i++)
{
key_left_buf[i] = key_tmp[PC1[i]-1];
key_right_buf[i] = key_tmp[PC1[i+28]-1];
}
for(tmp3=0; tmp3<(17-count); tmp3++)
{
//key begin========================================================================================//
for(j=0; j<shift[tmp3]; j++)
{
tmp1 = key_left_buf[0];
tmp2 = key_right_buf[0];
for (i=0; i<27; i++) //循环左移
{
key_left_buf[i] = key_left_buf[i+1];
key_right_buf[i] = key_right_buf[i+1];
}
key_left_buf[27] = tmp1;//如果27改写成i+1将会出错！
key_right_buf[27] = tmp2;
}
for(i=0; i<28; i++)//combine the key_left and key_right together
{
temp_buf[i] = key_left_buf[i];
temp_buf[i+28] = key_right_buf[i];
}
for(i=0; i<48; i++)//pc2置换
{
key[i] = temp_buf[PC2[i]-1];
}
//key end==========================================================================================//
}
for(i=0; i<48; i++)//Permute-E convert 32bits source_right into 48bits
{
temp_buf[i] =source_right_buf[E[i]-1];
}
/* temp_buf XOR key */
for (i=0; i<48; i++)
{
temp_buf[i] = temp_buf[i] ^ key[i];
}
for (i=0; i<8; i++)
{
tmp3 = si[i]
[temp_buf[i*6]*2+temp_buf[i*6+5]]
[temp_buf[i*6+1]*8+temp_buf[i*6+2]*4+temp_buf[i*6+3]*2+temp_buf[i*6+4]];
temp_buf[i*4]=(j = tmp3/8)%2;
temp_buf[i*4+1]=(j / 4)%2;
temp_buf[i*4+2]=(j / 2)%2;
temp_buf[i*4+3]=j % 2;
}
for (i = 0; i < 32; i++)
{
function_result[i] = temp_buf[P32i[i]-1] ^ source_left_buf[i];
if(count <= 15)
{
source_left_buf[i] = source_right_buf[i];
source_right_buf[i] = function_result[i];
}
}
}
for(i=0; i<32; i++)
{
temp_buf[i] = function_result[i];
temp_buf[i+32] = source_right_buf[i];
}
/* Inverse Initial Permutation */
for(i=0; i<64; i++)
{
DATAout[i] = temp_buf[IP_[i]-1];
}
for(i=0; i<8; i++)
{
for(j=0; j<8; j++)
{
DATAout[i] = 2*DATAout[i] + DATAout[i*8+j];
}
}
}
//*********************************************************************************************************//
// the Program of MAIN //
//*********************************************************************************************************//
void main(void)
{
ULONG16 i,j;
ULONG8 *cp;
ULONG8 keyinput[8] = { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88};
//ULONG8 plaintext[8] = {0x6e, 0x21, 0xe2, 0x66, 0xa2, 0x6a, 0x23, 0x52};
ULONG8 plaintext[8] = {0x55, 0x55, 0x55, 0x21, 0x21, 0x21, 0x21, 0x55};
cp=plaintext;
printf("\nplaintext:\n");
for(i=0; i<8; i++)
{
printf("0x%02x ",((ULONG16) cp[i])&0x00ff);
}
printf("\n");
DES_encode(plaintext, keyinput);
printf("\nDES Encode out:\n");
for(i=0; i<8; i++)
{
printf("0x%02x ",((ULONG16) DATAout[i])&0x00ff);
}
DES_decode(DATAout, keyinput);
printf("\n");
printf("\nDES Decode out:\n");
for(i=0; i<64; i++)
{
if(i%8==0)
{
printf("0x%02x ",((ULONG16) DATAout[i/8])&0x00ff);
}
}
for(j=0; j<4; j++)
{
printf("\n");
}
}
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