RAS加密算法的----C语言实现

/*MAIN函数*/
# include <iostream.h>
# include <string.h>
# include <fstream.h>
# include <math.h>
# include <stdio.h>
# include <conio.h>
# include <stdlib.h>
# define ul unsigned long
ul isPrime(ul n)
{
 ul b=1;
 for(ul i=2;i<n;i++)
  if(n%i==0) { b=0; break; }
 return b;
}
ul Power(ul x,ul y)
{
 ul ans=1;
 if(x==1) return x;
 for(ul i=1;i<=y;i++)
   ans*=x;
 return(ans);
}
char * ToBin(int x)
{
char *ans=new char[20];
int i=0;
 while(x>=1)
 {

  if(x%2==1) ans[i]='1'; else ans[i]='0';
  x/=2; i++;
 }
 if(x==1) ans[i]='1',i++;
 ans[i]='\0';
 strrev(ans);
 return(ans);
}
ul Crypt(int x,int key,int n) // (x^y)%z //Method 2
{
 char *B=new char[20];
 B=ToBin(key);
 ul ans=1;int c=1;
 for(int i=0;i <strlen(B);i++)
 {
   c=2*c;
   ans=(ans*ans)%n;
   if(B[i]=='1')
   {
    c=c+1;
    ans=(ans*x)%n;
   }
 }
 return(ans);
}
void Fun1(int,int,int);
int Bin2Num(char *s)
{
 int ans=0; int i,j;
 for(j=0,i=7;i>=0;j++,i--)