www.pudn.com > 200410111016053551.rar > Des.cpp

///////////////////////////////////////////////////////////////////////////// 
//Project:      互联资讯电子券项目--中心服务部分 
//Discription:  DES加密、解密公共模块 
//Written By:   ZXZ 
//Date:         2001-08-21 
//Version:      1.0 
 
//Modified by: 
//Modified Date: 
//Version: 
//////////////////////////////////////////////////////////////////////////// 
#include "stdafx.h" 
#include "des.h" 
#include  
 
static unsigned char C[17][28],D[17][28],K[17][48],c,ch1; 
 
 
void DesMac(unsigned char *source, int iLen, unsigned char *dest, 
            unsigned char *key) 
{ 
    unsigned char strXOR[8], strTemp[8]; 
    int i, iCount=iLen/8, iRemain=iLen%8; 
    memset(strXOR, 0, sizeof(strXOR)); 
    for(i=0; i>4); 
        dsp[i*2]=(char)((ch>9)?ch+0x41-10:ch+0x30); 
        ch=(unsigned char)(hex[i]&0xf); 
        dsp[i*2+1]=(char)((ch>9)?ch+0x41-10:ch+0x30); 
    } 
} 
     
void DSP_2_HEX(unsigned char *dsp, unsigned char *hex, int count) 
{ 
    int i; 
    unsigned char ch1, ch2; 
 
    for (i = 0; i < count; i++) 
    { 
        ch1 = (unsigned char)dsp[i*2], ch2 = (unsigned char)dsp[i*2+1]; 
        hex[i]=(char)((((ch1<=0x39)?ch1-0x30:(ch1&0xdf)-0x41+10)<<4) 
          |((ch2<=0x39)?ch2-0x30:(ch2&0xdf)-0x41+10)); 
    } 
} 
 
 
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; 
    } 
  } 
}