#include?“iostream.h“
struct?pointer{
	int?X;
	int?Y;
}G;?

int?p;?//所選擇的質(zhì)數(shù)
int?ab;
int?prikey;//私鑰
void?getparameter（）???//輸入pab的函數(shù)
{
	int?flag1=0;
	while（!flag1）
	{
		cout<<“Please?input?a?prime?number:?“<	????cin>>p;
????	cout<<“Please?input?the?parameters（<“<	????cin>>a;
	????cout<<“b:?“;
	????cin>>b;
		if（（4*a*a*a+27*b*b）%p）?//4a^3+27b^2!=0?（mod?p）
			flag1=1;
	}
	cout<<“now?we?have?the?ecc:?E“<}

void?getG（）?//輸入基點G的函數(shù)
{
	int?flag2=0;
	int?flag3=0;
	while（!flag2）
	{
		int?leftright;
		while（!flag3）
		{
			cout<<“Please?input?the?G（0=			cin>>G.X;
			cout<<“Y=“;
			cin>>G.Y;
			if（（G.X>p-1）||（G.Y>p-1））
				cout<<“Invalid?number?input?again!“<			else
				flag3=1;
		}
		
		left=（（G.Y）*（G.Y））%p;?//?y^2=x^3+ax+b??（mod?p）
		right=（（G.X）*（G.X）*（G.X）+a*（G.X）+b）%p;
		if（left==right）???
			flag2=1;
		else?
		{
			cout<<“Not?a?pointer?on?the?curve!?Please?input?again!“<			flag3=0;
		}
	}
}


int?getprikey（）?//輸入私鑰函數(shù)
{
	cout<<“Please?input?the?private?key:?“;
	cin>>prikey;
	cout<	return?prikey;
}


struct?pointer?getpubkey（int?key?struct?pointer?P）//得到公鑰的函數(shù)，以基點，私鑰為參數(shù)返回公鑰
{
	
	int?slope;/