des1.cpp

一个好的DES程序.可能程序不是很完整,希望大家多多指教

#include <iostream.h>
#include<string.h>

int PC1[56]={
		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};
int PC2[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};
int IP[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};

int IP1[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};
int E[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};

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};

int S[32][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,
		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
	};

int ExchangeIP(int x[65])//初始置换
{
	int i;
	int x1[65];
	for(i=1;i<65;i++)
		x1[i]=x[i];
	for(i=1;i<65;i++)
		x[i]=x1[IP[i-1]];
	return x[65];
}

int LR(int Plain[65],int L[33],int R[33])//将左右分开
{
	int i;
	for(i=1;i<=32;i++)
	{
		L[i]=Plain[i];
		R[i]=Plain[32+i];
	}
	return L[33],R[33];
}

int ExchangePC1(int Key[65],int C[29],int D[29])//选择置换PC-1
{
	int i;

	for(i=1;i<29;i++)
	{
		C[i]=Key[PC1[i-1]];
		D[i]=Key[PC1[27+i]];
	}
	return C[29],D[29];
}

int ExchangePC2(int K[49],int C[29],int D[29])//选择置换PC-2
{
	int i;
	for(i=1;i<=48;i++)
	{
		K[i]=C[PC2[i-1]];
		if(PC2[i-1]>28)K[i]=D[PC2[i-1]-28];		
	} 
	return K[49];
}

int LeftShift(int C[29],int j)//循环左移
{
	int i,temp1,temp2;
	if(j==1||j==2||j==9||j==16)
	{
		temp1=C[1];
		for(i=1;i<28;i++)
			C[i]=C[i+1];
		C[28]=temp1;
	}
	else
	{
		temp1=C[1];temp2=C[2];
		for(i=1;i<27;i++)
			C[i]=C[i+2];
		C[27]=temp1;C[28]=temp2;
	}
	return C[29];
}

int ER(int Plain,int R[33],int K[49])//E和R异或
{
	int i;
	int ER1[100];
	for(i=1;i<=48;i++)
	{
		ER1[i]=R[E[i-1]];
		ER1[i]=ER1[i]+K[i];
		if(ER1[i]==2)ER1[i]=0;
	}	
	return ER1[49];
}

int equal(int A[33],int B[33])//两个相等的数组
{
	int i;
	for(i=1;i<=32;i++)
	{
		A[i]=B[i];
	}
	return A[33];
}

int f(int f1[33],int ER1[49])//f生成
{
	int f2[33];	
	int i,k,j,c,r,temp;
	k=1;
	for(i=1;i<=48;i+=6)
	{
		r=(k-1)*4+ER1[i]*2+ER1[i+5];
		c=ER1[i+1]*8+ER1[i+2]*4+ER1[i+3]*2+ER1[i+4];
		temp=S[r][c];
		for(j=4*k;j>(k-1)*4;j--)
		{
			f1[j]=temp%2;
			temp=temp/2;
		}
		k++;
	}
	for(i=1;i<=32;i++)
	{
		cout<<f1[i];
		if(i%8==0)cout<<endl;
	}
	equal(f2,f1);
	for(i=1;i<=32;i++)
		f1[i]=f2[P[i-1]];
	return f1[33];
}
		
void main()
{
	int i,l,j,temp,Plain[64]={0},L[33],R[33];
	int x[65]=
			{0,1,2,3,4,5,6,7,8,
			 9,10,11,12,13,14,15,16,
			 17,18,19,20,21,22,23,24,
			 25,26,27,28,29,30,31,32,
			 33,34,35,36,37,38,39,40,
			 41,42,43,44,45,46,47,48,
			 49,50,51,52,53,54,55,56,
			 57,58,59,60,61,62,63,64
			 };
	int Key[64]={0};
	char key[8];
	int C[29],D[29],K[49];
	
	int f1[33]={0};	
	char string[100];
	cout<<"请输入要加密的明文"<<endl;
	cin>>string;
	l=strlen(string);

	cout<<l<<endl ;

	for(i=0;i<8;i++)
	{
		temp=string[i];
		for(j=(i+1)*8;j>i*8;j--)
		{
			Plain[j]=temp%2;
			temp=temp/2;
		}
	}	
		for(j=1;j<=64;j++)
		{
		cout<<Plain[j]<<' ';

		if(j%8==0)cout<<endl;
		}
	
		cout<<"Please input the key:";
	cin>>key;
	l=strlen(key);
	for(i=0;i<l;i++)
	{	
		temp=key[i];
		for(j=(i+1)*8;j>i*8;j--)
		{
			Key[j]=temp%2;
			temp=temp/2;
		}
	}
	ExchangeIP(Plain);
	LR(Plain,L,R);
	ExchangePC1(Key,C,D);
	for(i=1;i<=16;i++)
	{
		LeftShift(C,i);
		LeftShift(D,i);
		ExchangePC2(K,C,D);
		ER(Plain,R,K);
		f(f1,Plian);

	}
	

}