📄 desmiyue.txt
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/**************************************************************************/
/*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(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;
}
void main(void){
CDES des;
des.EncryptKey("12345678");
unsigned char *result=des.EncryptData((unsigned char*)"DemoData");
des.DescryptData(result);
}
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