double.cpp

单机版多对象进行密钥交换

#include<iostream.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

//using namespace std ;

class user
  {
   public:
   int p;
   int g;
   int key;
  private:
       int sec;//随机产生的数值或者先由键盘输入；
  public:
   void get( int,int);
   void getsecert();

   int transget(int);
   int compute();
  };
void user::get(int mainp,int maing)
{
	p=mainp;
	g=maing;
}
  void user::getsecert()
  {
	 // cout<<"请输入secert的值：";
	 // cin>>sec;
     srand( (short int)time( NULL ) );
	   while(1)
	 {
		  sec=rand();
		 if(sec<p)  break;		 
	   }
   printf("the randomnum is %d\n",sec);

  }
  int user::compute()
  {
	  int i;
	  key=1;
	  for(i=0;i<sec;i++)
        key=(g*key)%p;
	
	  return key;
  }
  
  
   int user::transget(int getvalue)
	{
	  int i;
	  key=1;
	  for(i=0;i<sec;i++)
        key=(getvalue*key)%p; 
	 return key;

	}
 void main()
 {
	  int p,g;
	 cout<<"请输入p的值：";
	  cin>>p;
	 cout<<"请输入g的值：";
	  cin>>g; 
     user A,B;
     int akey,ax,bkey,bx;
	  A.get(p,g);
	   A.getsecert();
	   
	   ax=A.compute();
      cout<<"ax:"<<ax<<endl;
     B.get(p,g);
	  B.getsecert();
	   bx=B.compute();
	  cout<<"bx:"<<bx<<endl;
	 akey=A.transget(bx);	    
	 bkey=B.transget(ax);
	     
	 if(akey==bkey)
	 {
		 cout<<"密钥交换Success!"<<endl;
	 }
     else
		 cout<<"error!"<<endl;
 }