www.pudn.com > 200410111032011273DESMD5ZLIB算法源代码.rar > Des.cpp
#include "stdafx.h"
#include "des.h"
#include
static unsigned char C[17][28],D[17][28],K[17][48],c,ch1;
ARITHDLL_API void WINAPI GetDesKey(unsigned char *pbyKey, int n)
{
memset(pbyKey, 0, 8);
for(int i=0; i= 0; i--)
{
ch1=((hex[i]&0xf0)>>4);
ch2=(hex[i]&0xf);
dsp[i*2]=(ch1>9) ? ch1+0x41-10 : ch1+0x30;
dsp[i*2+1]=(ch2>9) ? ch2+0x41-10 : ch2+0x30;
}
}
ARITHDLL_API void WINAPI DSP_2_HEX(unsigned char *dsp, unsigned char *hex, int count)
{
int i;
unsigned char ch1, ch2;
for (i = 0; i < count; i++)
{
ch1 = dsp[i*2] - 0x30;
ch2 = dsp[i*2+1] -0x30;
hex[i] = (((ch1<=0x09) ? ch1 : (ch1&0x0F)+9) << 4 ) |
((ch2<=0x09) ? ch2 : (ch2&0x0F)+9);
}
}
void encrypt0(unsigned char *text, unsigned char *mtext)
{
char ll[64],rr[64],LL[64],RR[64];
unsigned char tmp[64];
int i,j;
ip(text,(unsigned char *)ll,(unsigned char *)rr);
for (i=1;i<17;i++)
{
FF(i,ll,rr,LL,RR);
for (j=0;j<32;j++)
{
ll[j]=LL[j];
rr[j]=RR[j];
}
}
_ip(tmp,(unsigned char *)rr,(unsigned char *)ll);
compress0(tmp,mtext);
}
void discrypt0(unsigned char *mtext, unsigned char *text)
{
char ll[64],rr[64],LL[64],RR[64];
unsigned char tmp[64];
int i,j;
ip(mtext,(unsigned char *)ll,(unsigned char *)rr);
for (i=16;i>0;i--)
{
FF(i,ll,rr,LL,RR);
for (j=0;j<32;j++)
{
ll[j]=LL[j];
rr[j]=RR[j];
}
}
_ip(tmp,(unsigned char *)rr,(unsigned char *)ll);
compress0(tmp,text);
}
void expand0(unsigned char *in, char *out)
{
int divide;
int i,j;
for (i=0;i<8;i++)
{
divide=0x80;
for (j=0;j<8;j++)
{
*out++=(in[i]/divide)&1;
divide/=2;
}
}
}
void compress0(unsigned char *out, unsigned char *in)
{
int times;
int i,j;
for (i=0;i<8;i++)
{
times=0x80;
in[i]=0;
for (j=0;j<8;j++)
{
in[i]+=(*out++)*times;
times/=2;
}
}
}
void compress016(unsigned char *out, unsigned char *in)
{
int times;
int i,j;
for (i=0;i<16;i++)
{
times=0x8;
in[i]='0';
for (j=0;j<4;j++)
{
in[i]+=(*out++)*times;
times/=2;
}
}
}
static int pc_1_c[28]=
{
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
};
static int pc_1_d[28]=
{
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
};
static int pc_2[48]=
{
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
};
static int ls_count[16]=
{
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
void setkeystar(unsigned char *bits)
{
int i,j;
for (i=0;i<28;i++)
C[0][i]=bits[pc_1_c[i]-1];
for (i=0;i<28;i++)
D[0][i]=bits[pc_1_d[i]-1];
for (j=0;j<16;j++)
{
LS((char *)C[j],(char *)C[j+1],ls_count[j]);
LS((char *)D[j],(char *)D[j+1],ls_count[j]);
son((char *)C[j+1],(char *)D[j+1],(char *)K[j+1]);
}
}
void LS(char *bits, char *buffer, int count)
{
int i;
for (i=0;i<28;i++)
{
buffer[i]=bits[(i+count)%28];
}
}
void son(char *cc, char *dd, char *kk)
{
int i;
char buffer[56];
for (i=0;i<28;i++)
buffer[i] = *cc++;
for (i=28;i<56;i++)
buffer[i] = *dd++;
for (i=0;i<48;i++)
*kk++=buffer[pc_2[i]-1];
}
static int ip_tab[64]=
{
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
};
static int _ip_tab[64]=
{
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
};
void ip(unsigned char *text, unsigned char *ll, unsigned char *rr)
{
int i;
char buffer[64];
expand0(text,buffer);
for (i=0;i<32;i++)
ll[i]=buffer[ip_tab[i]-1];
for (i=0;i<32;i++)
rr[i]=buffer[ip_tab[i+32]-1];
}
void _ip(unsigned char *text, unsigned char *ll, unsigned char *rr)
{
int i;
char tmp[64];
for (i=0;i<32;i++)
tmp[i]=ll[i];
for (i=32;i<64;i++)
tmp[i]=rr[i-32];
for (i=0;i<64;i++)
text[i]=tmp[_ip_tab[i]-1];
}
static int e_r[48]=
{
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
};
static int P[32]=
{
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
};
static int SSS[16][4][16]=
{
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, /* err on */
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,
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,
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,
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, /* err on */
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, /* err on */
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,
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,
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,
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
};
void FF(int n, char *ll, char *rr, char *LL, char *RR)
{
int i;
char buffer[64],tmp[64];
for (i=0;i<48;i++)
buffer[i]=rr[e_r[i]-1];
for (i=0;i<48;i++)
buffer[i]=(buffer[i]+K[n][i])&1;
s_box(buffer,tmp);
for (i=0;i<32;i++)
buffer[i]=tmp[P[i]-1];
for (i=0;i<32;i++)
RR[i]=(buffer[i]+ll[i])&1;
for (i=0;i<32;i++)
LL[i]=rr[i];
}
void s_box(char *aa, char *bb)
{
int i,j,k,m;
int y,z;
char ss[8];
m=0;
for (i=0;i<8;i++)
{
j=6*i;
y=aa[j]*2+aa[j+5];
z=aa[j+1]*8+aa[j+2]*4+aa[j+3]*2+aa[j+4];
ss[i]=SSS[i][y][z];
y=0x08;
for (k=0;k<4;k++)
{
bb[m++]=(ss[i]/y)&1;
y/=2;
}
}
}