mingwen.txt

来自「整体思路 用createkey.java 文件来产生秘钥」· 文本 代码 · 共 67 行

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.math.*;

public class jiemi
{
	int b;
	byte tom[]=new byte[17];
	BigInteger n;
	BigInteger e;
	BigInteger d;
	File f;
	File ff;
	jiemi(BigInteger n,BigInteger e,BigInteger d,File f,File ff)
	{
		this.n=n;
		this.e=e;
		this.d=d;
		this.f=f;
		this.ff=ff;
		try{
			FileInputStream in=new FileInputStream(f);
			FileOutputStream out=new FileOutputStream(ff);
			while((b=in.read(tom,1,16))!=-1)
			{
				BigInteger c=new BigInteger(tom);
				BigInteger mm=c.modPow(d,n);
				byte tom2[]=new byte[15];
				tom2=mm.toByteArray();
	
				String str=c.toString(16);	
				str=mm.toString(16);
				System.out.println("mm:"+str);
				

				boolean flag=false;
				String sss=mm.toString(16);
				if(sss.startsWith("8")){
					flag=true;
				}
				
				if(tom2.length==16)
					out.write(tom2, 1, 15);
				else if(tom2.length==15)
					out.write(tom2,0,tom2.length);
				else if(tom2.length<15&&flag==false)
					out.write(tom2, 0, tom2.length);
				else if(tom2.length<15&&flag==true)
					out.write(tom2,1,tom2.length-1);
				
				
				for(int j=0;j<16;j++)
					tom[j]=0;
			}
			in.close();
			out.close();
		}
		catch(IOException ffe)
		{
			System.out.println("File read Error"+ffe);
		}
		
	}
}