📄 des.c
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#include "des.h"
static const unsigned char 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 const unsigned char 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 const unsigned char 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 const unsigned char ls_count[16]={
1,1,2,2,2,2,2,2,
1,2,2,2,2,2,2,1
};
static const unsigned char 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 const unsigned char _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
};
static const unsigned char 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 const unsigned char 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 const unsigned char SSS[8][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}
}
};
/**************************************************************************
* Tools
**************************************************************************/
//extern unsigned char C[17][28],D[17][28],K[17][48];
static unsigned char C[17][28],D[17][28],K[17][48];
static void s_box(char *aa,char *bb)
{
unsigned char i,j,k,m;
unsigned char 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;
}
}
}
static void LS(unsigned char *bits,unsigned char *buffer,unsigned char count)
{
unsigned char i;
for (i=0;i<28;i++)
{
buffer[i]=bits[(i+count)%28];
}
}
static void F(unsigned char n,char *ll,char *rr,char *LL,char *RR)
{
unsigned char 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];
}
static void ip_1(LPBYTE text,char *ll,char *rr)
{
unsigned char 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 void expand0(LPBYTE in,char *out)
{
unsigned char divide;
unsigned char i,j;
for (i=0;i<8;i++)
{
divide=0x80;
for (j=0;j<8;j++)
{
*out++=(in[i]/divide)&1;
divide/=2;
}
}
}
static void son(unsigned char *cc,unsigned char *dd,unsigned char *kk)
{
unsigned char 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 void compress0(char *out,LPBYTE in)
{
unsigned char times;
unsigned char 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;
}
}
}
/*static void compress016(char *out,LPBYTE in)
{
unsigned char times;
unsigned char 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 void setkeystar(unsigned char bits[64])
{
unsigned char 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(C[j],C[j+1],ls_count[j]);
LS(D[j],D[j+1],ls_count[j]);
son(C[j+1],D[j+1],K[j+1]);
}
}
/*
print(buffer,n)
char *buffer;
unsigned char n;
{
unsigned char i;
for (i=0;i<n;i++)
printf("%c",(*buffer++)+'0');
printf("\n");
}
*/
static void ip(LPBYTE text,char *ll,char *rr)
{
unsigned char i;
char buffer[64];
//char tmp[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];
}
static void encrypt0(LPBYTE text,LPBYTE mtext)
{
char ll[64],rr[64],LL[64],RR[64];
char tmp[64];
unsigned char i,j;
ip(text,ll,rr);
for (i=1;i<17;i++)
{
F(i,ll,rr,LL,RR);
for (j=0;j<32;j++)
{
ll[j]=LL[j];
rr[j]=RR[j];
}
}
ip_1((unsigned char*)tmp,rr,ll);
compress0(tmp,mtext);
}
static void discrypt0(LPBYTE mtext,LPBYTE text)//2008-10-21,15:20,ǰ������������һ��λ��.author:zuoyijian
{
char ll[64],rr[64],LL[64],RR[64];
char tmp[64];
unsigned char i,j;
ip(mtext,ll,rr);
for (i=16;i>0;i--)
{
F(i,ll,rr,LL,RR);
for (j=0;j<32;j++)
{
ll[j]=LL[j];
rr[j]=RR[j];
}
}
ip_1((unsigned char*)tmp,rr,ll);
compress0(tmp,text);
}
/*--------------------------------
*Single DES �����㷨
*void DES(uchar *key,uchar *text,uchar *mtext)
* ��Կ: uchar *key (8Bytes)
* ����: uchar *text (8Bytes)
* ����: uchar *mtext (8Bytes)
----------------------------------*/
void DES(uchar *key,uchar *text,uchar *mtext)
{
char tmp[64];
expand0(key,tmp);
setkeystar((unsigned char*)tmp);
encrypt0(text,mtext);
}
/*--------------------------------
*Single DES �����㷨
*void DES_1(uchar *key,uchar *text,uchar *mtext)
* ��Կ: uchar *key (8Bytes)
* ����: uchar *text (8Bytes)
* ����: uchar *mtext (8Bytes)
----------------------------------*/
void DES_1(uchar *key,uchar *text,uchar *mtext)
{
char tmp[64];
expand0(key,tmp);
setkeystar((unsigned char*)tmp);
discrypt0(text,mtext);
}
//////////////////////
/*--------------------------------
*Triple DES �����㷨
*void TripleDES(uchar *key,uchar *text,uchar *mtext)
* ��Կ: uchar *key (16Bytes)
* ����: uchar *text (8Bytes)
* ����: uchar *mtext (8Bytes)
----------------------------------*/
void TripleDES(uchar *key16,uchar *text,uchar *mtext)
{
uchar i;
uchar keyL[8];
uchar keyR[8];
uchar dump1[8];
uchar dump2[8];
for (i=0;i<8;i++)
{
dump1[i]=0x00;
dump2[i]=0x00;
}
for (i=0;i<8;i++)
{
keyL[i]=key16[i];
keyR[i]=key16[i+8];
}
DES(keyL,text,dump1);
DES_1(keyR,dump1,dump2);
DES(keyL,dump2,mtext);
}
/*--------------------------------
*Triple DES �����㷨
*void TripleDES_1(uchar *key,uchar *text,uchar *mtext)
* ��Կ: uchar *key (16Bytes)
* ����: uchar *text (8Bytes)
* ����: uchar *mtext (8Bytes)
----------------------------------*/
void TripleDES_1(uchar *key16,uchar *text,uchar *mtext)
{
uchar i;
uchar keyL[8];
uchar keyR[8];
uchar dump1[8];
uchar dump2[8];
for (i=0;i<8;i++)
{
dump1[i]=0x00;
dump2[i]=0x00;
}
for (i=0;i<8;i++)
{
keyL[i]=key16[i];
keyR[i]=key16[i+8];
}
DES_1(keyL,text,dump1);
DES(keyR,dump1,dump2);
DES_1(keyL,dump2,mtext);
}
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