attackpass.java

Java安全性编程实例,解压看说明

import java.io.*;
import java.security.*;
public class AttackPass{
     public static void main(String args[ ]) throws Exception{
          MessageDigest m=MessageDigest.getInstance("MD5");
           PrintWriter out= new PrintWriter(
                        new FileOutputStream("dict.txt"));

         for(int i1='a';i1<'z';i1++){
            System.out.println("Now Processing"+(char)i1);
            for(int i2='a';i2<'z';i2++)
            for(int i3='a';i3<'z';i3++)
              for(int i4='a';i4<'z';i4++){
                      char[ ] ch={(char)i1,(char)i2,(char)i3,(char)i4};
                      String passwd=new String(ch);
           		 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);
	               }
                      out.print(passwd+"    ");
                      out.println(result);
             }   
      }
      out.close();
     }
}