C++ DES算法源代码

//schedle.h
#include <windows.h>

DWORDLONG dwlKey_PC_1[64]={
  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,
  21,13,5,28,20,12,4,0};

 DWORDLONG dwlKey_PC_2[64]={
  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,
  46,42,50,36,29,32,0};

 DWORDLONG dwlData_IP[65]={
  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,
  63,55,47,39,31,23,15,7,0};

 DWORDLONG dwlData_Expansion[64]={
  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,
  28,29,30,31,32,1,0};
 DWORDLONG dwlData_P[33]={
  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,
  22,11,4,25,0};

 DWORDLONG dwlData_FP[65]={
  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,
  33,1,41,9,49,17,57,25,0};

 DWORDLONG OS[512]={
  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,

  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,

  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,

  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
 };

//Des.cpp

/********************************************************************/
/*                    DES(Data Encryption Standard)                 */
/*                        Written by Bunny                          */
/*                      Banyet Soft Labs. 1999                      */
/*                        ALL RIGHTS RESERVED!                      */
/*          注意! 版权所有! 可以自由转载,但不得加以修改或删除!      */
/*         E-mail:Assassin@ynmail.com  Http://Assassin.yeah.net     */  
/********************************************************************/

/**************************************************************************/
/*注意:这只是标准DES算法的例子,所以速度并不是很快,不适用于大量数据加密的场*/
/*合.UNIX的密码也采用DES,不过它在里面加了点其它的东西.所以结果和DES的结果 */
/*不一样. 由于使用了WINDOWS类库,所以必须在WINDOWS环境下编译.              */
/**************************************************************************/

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <conio.h>
#include “Schedle.h”

class CShift{
public:
 DWORDLONG mask[16];
 int step[16];
 CShift(){
  for(int i=0;i<16;i++){
   step[i]=2;
   mask[i]=0xc000000;
  }
  step[0]=step[1]=step[8]=step[15]=1;
  mask[0]=mask[1]=mask[8]=mask[15]=0x8000000;
 }
};

class CDES{

public:

 CDES(){
  m_dwlKey=0;
  m_dwlData=0;
  ConvertTableToMask(dwlKey_PC_1,64);
  //PrintTable(dwlKey_PC_1,7,8);
  ConvertTableToMask(dwlKey_PC_2,56);
  ConvertTableToMask(dwlData_IP,64);
  ConvertTableToMask(dwlData_Expansion,32);
  ConvertTableToMask(dwlData_FP,64);
  ConvertTableToMask(dwlData_P,32);
  Generate_S();

 }
 void PrintBit(DWORDLONG);
 void EncryptKey(char *);
 unsigned char* EncryptData(unsigned char *);
 unsigned char* DescryptData(unsigned char*);

private:
 void ConvertTableToMask(DWORDLONG *,int);
 void Generate_S(void);
 void PrintTable(DWORDLONG*,int,int);
 DWORDLONG ProcessByte(unsigned char*,BOOL);
 DWORDLONG PermuteTable(DWORDLONG,DWORDLONG*,int);
 void Generate_K(void);
 void EncryptKernel(void);
 DWORDLONG Generate_B(DWORDLONG,DWORDLONG*);
 /*For verify schedule permutation only*/
 DWORDLONG UnPermuteTable(DWORDLONG,DWORDLONG*,int);
 /**************************************/
 DWORDLONG dwlData_S[9][4][16];
 CShift m_shift;
 DWORDLONG m_dwlKey;
 DWORDLONG m_dwlData;
 DWORDLONG m_dwl_K[17];
};  

void CDES::EncryptKey(char *key){

 printf(“\nOriginal Key: %s”,key);
 m_dwlKey=ProcessByte((unsigned char*)key,TRUE);
// PrintBit(m_dwlKey);
 m_dwlKey=PermuteTable(m_dwlKey,dwlKey_PC_1,56);
// PrintBit(m_dwlKey);
 Generate_K();
// printf(“\n******************************************\n”);
}

void CDES::Generate_K(void){

 DWORDLONG C[17],D[17],tmp;

 C[0]=m_dwlKey>>28;
 D[0]=m_dwlKey&0xfffffff;
 
 for(int i=1;i<=16;i++){
  tmp=(C[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]);
  C[i]=((C[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff;
  tmp=(D[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]);
  D[i]=((D[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff;
  m_dwl_K[i]=(C[i]<<28)|D[i];
  m_dwl_K[i]=PermuteTable(m_dwl_K[i],dwlKey_PC_2,48);
 }
}

DWORDLONG CDES::ProcessByte(unsigned char *key,BOOL shift){

 unsigned char tmp;
 DWORDLONG byte=0;
 int i=0;

 while(i<8){
  while(*key){
   if(byte!=0)
    byte<<=8;
   tmp=*key;
   if(shift)
    tmp<<=1;
   byte|=tmp;
   i++;
   key++;
  }
  if(i<8)
   byte<<=8;
  i++;
 }
 return byte;
}

DWORDLONG CDES::PermuteTable(DWORDLONG dwlPara,DWORDLONG* dwlTable,int nDestLen){

 int i=0;
 DWORDLONG tmp=0,moveBit;

 while(i<nDestLen){
  moveBit=1;
  if(dwlTable[i]&dwlPara){
   moveBit<<=nDestLen-i-1;
   tmp|=moveBit;
  }
  i++;
 }
 return tmp;
}

DWORDLONG CDES::UnPermuteTable(DWORDLONG dwlPara,DWORDLONG* dwlTable,int nDestLen){

 DWORDLONG tmp=0;
 int i=nDestLen-1;

 while(dwlPara!=0){
  if(dwlPara&0x01)
   tmp|=dwlTable[i];
  dwlPara>>=1;
  i–;
 }
 return tmp;
}

void CDES::PrintTable(DWORDLONG *dwlPara,int col,int row){

 int i,j;
 for(i=0;i<row;i++){
  printf(“\n”);
  getch();
  for(j=0;j<col;j++)
   PrintBit(dwlPara[i*col+j]);
 }
}

void CDES::PrintBit(DWORDLONG bitstream){

 char out[76];
 int i=0,j=0,space=0;

 while(bitstream!=0){
  if(bitstream&0x01)
   out[i++]=’1′;
  else
   out[i++]=’0′;
  j++;
  if(j%8==0){
   out[i++]=’ ‘;
   space++;
  }
  
  bitstream=bitstream>>1;
 }
 out[i]=’\0′;
 strcpy(out,strrev(out));
 printf(“%s **:%d\n”,out,i-space);
}

void CDES::ConvertTableToMask(DWORDLONG *mask,int max){

 int i=0;
 DWORDLONG nBit=1;

 while(mask[i]!=0){
  nBit=1;
  nBit<<=max-mask[i];
  mask[i++]=nBit;
 }
}
  
void CDES::Generate_S(void){
 
 int i;
 int j,m,n;
 m=n=0;
 j=1;

 for(i=0;i<512;i++){
  dwlData_S[j][m][n]=OS[i];
  n=(n+1)%16;
  if(!n){
   m=(m+1)%4;
   if(!m)
    j++;
  }
 }
}

unsigned char * CDES::EncryptData(unsigned char *block){

 unsigned char *EncrytedData=new unsigned char(15);

 printf(“\nOriginal Data: %s\n”,block);
 m_dwlData=ProcessByte(block,0);
// PrintBit(m_dwlData);
 m_dwlData=PermuteTable(m_dwlData,dwlData_IP,64);
 EncryptKernel();
// PrintBit(m_dwlData);
 DWORDLONG bit6=m_dwlData;
 for(int i=0;i<11;i++){
  EncrytedData[7-i]=(unsigned char)(bit6&0x3f)+46;
  bit6>>=6;
 }
 EncrytedData[11]=’\0′;
 printf(“\nAfter Encrypted: %s”,EncrytedData);

 for(int i=0;i<8;i++){
  EncrytedData[7-i]=(unsigned char)(m_dwlData&0xff);
  m_dwlData>>=8;
 }
 EncrytedData[8]=’\0′;
 return EncrytedData;
}

void CDES::EncryptKernel(void){

 int i=1;

 DWORDLONG L[17],R[17],B[9],EK,PSB;
 L[0]=m_dwlData>>32;
 R[0]=m_dwlData&0xffffffff;
 
 for(i=1;i<=16;i++){
  L[i]=R[i-1];
  R[i-1]=PermuteTable(R[i-1],dwlData_Expansion,48); //Expansion R
  EK=R[i-1]^m_dwl_K[i]; //E Permutation
  PSB=Generate_B(EK,B); //P Permutation
  R[i]=L[i-1]^PSB;
 }

 R[16]<<=32;
 m_dwlData=R[16]|L[16];
 m_dwlData=PermuteTable(m_dwlData,dwlData_FP,64);
}

unsigned char* CDES::DescryptData(unsigned char *desData){

 int i=1;
 unsigned char *DescryptedData=new unsigned char(15);
 DWORDLONG L[17],R[17],B[9],EK,PSB;
 DWORDLONG dataPara;

 dataPara=ProcessByte(desData,0);
 dataPara=PermuteTable(dataPara,dwlData_IP,64);

 R[16]=dataPara>>32;
 L[16]=dataPara&0xffffffff;
 
 for(i=16;i>=1;i–){
  R[i-1]=L[i];
  L[i]=PermuteTable(L[i],dwlData_Expansion,48); //Expansion L
  EK=L[i]^m_dwl_K[i]; //E Permutation
  PSB=Generate_B(EK,B); //P Permutation
  L[i-1]=R[i]^PSB;
 }

 L[0]<<=32;
 dataPara=L[0]|R[0];
 dataPara=PermuteTable(dataPara,dwlData_FP,64);

// PrintBit(dataPara);

 for(i=0;i<8;i++){
  DescryptedData[7-i]=(unsigned char)(dataPara&0xff);
  dataPara>>=8;
 }
 DescryptedData[8]=’\0’;
 printf(“\nAfter Decrypted: %s\n”,DescryptedData);

 return DescryptedData;
}

DWORDLONG CDES::Generate_B(DWORDLONG EKPara,DWORDLONG *block){

 int i,m,n;
 DWORDLONG tmp=0;

 for(i=8;i>0;i–){
  block[i]=EKPara&0x3f;
  m=(int)(block[i]&0x20)>>4;
  m|=block[i]&0x01;
  n=(int)(block[i]<<1)>>2;
  block[i]=dwlData_S[i][m][n];
  EKPara>>=6;
 }

 for(i=1;i<=8;i++){
  tmp|=block[i];
  tmp<<=4;
 }
 tmp>>=4;
 tmp=PermuteTable(tmp,dwlData_P,32);

 return tmp;
}

int main(void){

 CDES des;
 des.EncryptKey(“12345678″);
 unsigned char *result=des.EncryptData((unsigned char*)”DemoData”);
 des.DescryptData(result);
 getchar();
}