df.cpp

信息安全相关

#include<iostream>
using namespace std;

void shift(int R1[20],int R2[23],int R3[24],int r)
{
	int j,R0;
	if(r==1)
	{
		R0=R1[13]^R1[16]^R1[17]^R1[18];
		for(j=18;j>=0;j--)
			R1[j+1]=R1[j];
		R1[0]=R0;
	}
	else if(r==2)
	{
		R0=R2[20]^R2[21];
		for(j=21;j>=0;j--)
			R2[j+1]=R2[j];
		R2[0]=R0;
	}
	else if(r==3)
	{
		R0=R3[7]^R3[20]^R3[21]^R3[22];
		for(j=22;j>=0;j--)
			R3[j+1]=R3[j];
		R3[0]=R0;
	}
}

void beginning(int R1[20],int R2[23],int R3[24],int key[64])
{	
	int Q,i;
	for(i=0;i<64;i++)
	{
		R1[0]=R1[0]^key[i];
		R2[0]=R2[0]^key[i];
		R3[0]=R3[0]^key[i];
		Q=R1[18]^R2[21]^R3[22];
		shift(R1,R2,R3,1);
		shift(R1,R2,R3,2);
		shift(R1,R2,R3,3);
		cout<<Q;
	}
}

void LSFR(int R1[20],int R2[23],int R3[24],int f[22])
{
   int Q;
	for(int i=0;i<22;i++)
	{
		R1[0]=R1[0]^f[i];
		R2[0]=R2[0]^f[i];
		R3[0]=R3[0]^f[i];
		Q=R1[18]^R2[21]^R3[22];
		shift(R1,R2,R3,1);
		shift(R1,R2,R3,2);
		shift(R1,R2,R3,3);
		cout<<Q;
	}



}
void clock(int R1[20],int R2[23],int R3[24])
{
	int Q,R0;
	R0=(R1[9]&R2[11])^(R2[11]&R3[11])^(R1[9]&R3[11]);
	if((R1[9]==R0)&&(R2[11]==R0)&&(R3[11]==R0))
	{
		shift(R1,R2,R3,1);
		shift(R1,R2,R3,2);
		shift(R1,R2,R3,3);
	}
	else if((R2[11]==R0)&&(R1[9]==R0))
	{
		shift(R1,R2,R3,1);
		shift(R1,R2,R3,2);
	}
	else if((R3[11]==R0)&&(R1[9]==R0))
	{
		shift(R1,R2,R3,1);
		shift(R1,R2,R3,3);
	}
	else if((R3[11]==R0)&&(R2[11]==R0))
	{
		shift(R1,R2,R3,2);
		shift(R1,R2,R3,3);
	}
	Q=R1[19]^R2[22]^R3[23];
	cout<<Q;
}
	
void main()
{
	int	R1[20]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    int R2[23]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    int R3[24]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    int key[64]={0,1,0,0,1,0,0,0,1,1,0,0,0,1,0,0,1,0,1,0,0,0,1,0,1,1,1,0,0,1,1,0,
		        1,0,0,1,0,0,0,1,1,1,0,1,0,1,0,1,1,0,1,1,0,0,1,1,1,1,1,1,0,1,1,1};
    int Frame_number[22]={0,0,1,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0};
	int i;
	beginning(R1,R2,R3,key);
	cout<<endl;
	LSFR(R1,R2,R3,Frame_number);
	cout<<endl;
	cout<<"被丢弃的100位输出依次是:"<<endl;
    for(i=0;i<100;i++)
        clock(R1,R2,R3);
	cout<<endl;
	cout<<"第一个114位输出依次是："<<endl;
	for(i=100;i<214;i++)
		clock(R1,R2,R3);
	cout<<endl;
	cout<<"第二个114位输出依次是："<<endl;
	for(i=214;i<328;i++)
		clock(R1,R2,R3);
	cout<<endl;
}