setpasssalt.java.orig

Java安全性编程实例,解压看说明

import java.util.*;
import java.io.*;
import java.security.*;
public class SetPassSalt{
     public static void main(String args[ ]) throws Exception{
           String name=args[0];
           String passwd=args[1];
           Random  rand=new Random();
                   byte[ ] salt=new byte[12];
                    rand.nextBytes(salt);

           MessageDigest m=MessageDigest.getInstance("MD5");
           m.update(salt);
           m.update(passwd.getBytes("UTF8"));
           byte s[ ]=m.digest( );
           String result="";
           for (int i=0; i<s.length; i++){
               result+=Integer.toHexString((0x000000ff & s[i]) | 
                        0xffffff00).substring(6);
	  }

           PrintWriter out= new PrintWriter(
new FileOutputStream("passwdsalt.txt"));

           out.println(name);
             for (int i=0; i<salt.length; i++){
                    out.print(salt[i]+",");
           }
            out.println("");

         out.println(result);
           out.close();
       }   
}