lfsr.cpp

无线通信系统中密钥流生成器——LILI-II。以VC＋＋为编程工具

#include "stdafx.h"
#include "LFSR.H"
CString LFSR::ctos(char aq[N])
{
	int i;
	CString s;
	for(i=0;i<length;i++)
	{
		if(aq[i]) s+='1';
		else s+='0';
	}
    return s;
}
//The function of Fibonacci LFSR
void LFSR::Fibonacci()
{
	int j; 
	char fb;
	fb=0;
	for(j=0;j<length;j++)
	{
		fb+=q[j]*a[j];
	}
	fb=fb%2;
	for(j=0;j<length-1;j++) 
	{
		a[j]=a[j+1];
	}
	a[length-1]=fb;
	
}
//The function of Galois LFSR
void LFSR::Galois()
{   
	int j;
	int t;
	t=a[0];
	if (t==1)
    for(j=0;j<length-1;j++)
	{
		a[j]=(a[j+1]+q[j])%2;	 
	}
	else
		for(j=0;j<length-1;j++)
		{
			a[j]=a[j+1];	 
		}
    a[length-1]=q[length-1]*t;
}
//F_G introduce the value of m_radio3
void LFSR::Run(int F_G) 
{
	if (!F_G) Fibonacci();
	else Galois();
}