DES的C++语言实现

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DES的C++实现有两部分组成--schedle.h和des.cpp

schedle.h
//外部定义部分
#include

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
};

//实现部分
des.cpp

#include
#include
#include
#include
#include "Schedle.h"

class CShift{
public:
    DWORDLONGmask[16];
    intstep[16];
   CShift(){
       for(inti=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();
    }
    voidPrintBit(DWORDLONG);
    voidEncryptKey(char *);
    unsignedchar* EncryptData(unsigned char *);
    unsignedchar* DescryptData(unsigned char*);
private:
    voidConvertTableToMask(DWORDLONG *,int);
    voidGenerate_S(void);
    voidPrintTable(DWORDLONG*,int,int);
    DWORDLONGProcessByte(unsigned char*,BOOL);
    DWORDLONGPermuteTable(DWORDLONG,DWORDLONG*,int);
    voidGenerate_K(void);
    voidEncryptKernel(void);
    DWORDLONGGenerate_B(DWORDLONG,DWORDLONG*);

    DWORDLONGUnPermuteTable(DWORDLONG,DWORDLONG*,int);

    DWORDLONGdwlData_S[9][4][16];
    CShiftm_shift;
    DWORDLONGm_dwlKey;
    DWORDLONGm_dwlData;
    DWORDLONGm_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){
    DWORDLONGC[17],D[17],tmp;
   C[0]=m_dwlKey>>28;
   D[0]=m_dwlKey&0xfffffff;
    for(inti=1;i<=16;i++)
    {
      //tmp=(C[i-1]&m_shift.mask[i-1])>>;(28-m_shift.step[i-1]);
      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]);
      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){
    unsignedchar tmp;
    DWORDLONGbyte=0;
    inti=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++;
    }
    returnbyte;
}
//基于des算法的rfid安全系统
DWORDLONG CDES::PermuteTable(DWORDLONG dwlPara,DWORDLONG*dwlTable,int nDestLen){
    inti=0;
    DWORDLONGtmp=0,moveBit;
   while(i
      moveBit=1;
      if(dwlTable[i]&dwlPara){
         moveBit<<=nDestLen-i-1;
         tmp|=moveBit;
       }
       i++;
    }
    returntmp;
}
DWORDLONG CDES::UnPermuteTable(DWORDLONG dwlPara,DWORDLONG*dwlTable,int nDestLen){
    DWORDLONGtmp=0;
    inti=nDestLen-1;
   while(dwlPara!=0){
      if(dwlPara&0x01)
         tmp|=dwlTable[i];
      dwlPara>>=1;
       i--;
    }
    returntmp;
}
void CDES::PrintTable(DWORDLONG *dwlPara,int col,int row){
    inti,j;
   for(i=0;i
      printf("\n");
      getch();
      for(j=0;j
         PrintBit(dwlPara[i*col+j]);
    }
}
void CDES::PrintBit(DWORDLONG bitstream){
    charout[76];
    inti=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){
    inti=0;
    DWORDLONGnBit=1;
   while(mask[i]!=0){
      nBit=1;
      nBit<<=max-mask[i];
      mask[i++]=nBit;
    }
}
void CDES::Generate_S(void){
    int i;
    intj,m,n;
    m=n=0;
    j=1;
   for(i=0;i<512;i++){
      dwlData_S[j][m][n]=OS[i];
      n=(n+1);
      if(!n){
         m=(m+1)%4;
          if(!m)
             j++;
       }
    }
}
unsigned char * CDES::EncryptData(unsigned char *block){
    unsignedchar *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);
    DWORDLONGbit6=m_dwlData;
    for(inti=0;i<11;i++){
      EncrytedData[7-i]=(unsignedchar)(bit6&0x3f)+46;
      bit6>>=6;
    }
   EncrytedData[11]='\0';
   printf("\nAfter Encrypted: %s",EncrytedData);
   for(i=0;i<8;i++){
      EncrytedData[7-i]=(unsignedchar)(m_dwlData&0xff);
      m_dwlData>>=8;
    }
   EncrytedData[8]='\0';
    returnEncrytedData;
}
void CDES::EncryptKernel(void){
    inti=1;
    DWORDLONGL[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); //ExpansionR
      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){
    inti=1;
    unsignedchar *DescryptedData=new unsigned char[15];
    DWORDLONGL[17],R[17],B[9],EK,PSB;
    DWORDLONGdataPara;
   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]=(unsignedchar)(dataPara&0xff);
      dataPara>>=8;
    }
   DescryptedData[8]='\0';
   printf("\nAfter Decrypted: %s\n",DescryptedData);
    returnDescryptedData;
}
DWORDLONG CDES::Generate_B(DWORDLONG EKPara,DWORDLONG*block){
    inti,m,n;
    DWORDLONGtmp=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);
    returntmp;
}
void main(void)
{
    CDESdes;
   des.EncryptKey("12345678");
    unsignedchar *result=des.EncryptData((unsigned char*)"DemoData");
   des.DescryptData(result);
}

编者注：以上是基于Console的实现，其UI设计没有实现。