senc.java

使用DES方法加解密

import java.io.*;
import java.security.*;
import javax.crypto.*;
public class SEnc{
   public static void main(String args[]) throws Exception{
        String s="Hello World!";
	FileInputStream f=new FileInputStream("key1.dat");
	ObjectInputStream b=new ObjectInputStream(f);
	Key k=(Key)b.readObject( );
	Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.ENCRYPT_MODE, k);
        byte ptext[]=s.getBytes("UTF8");
        for(int i=0;i<ptext.length;i++){
            System.out.print(ptext[i]+",");
        }
        System.out.println("");
        byte ctext[]=cp.doFinal(ptext);
        for(int i=0;i<ctext.length;i++){
             System.out.print(ctext[i] +",");
        }
	FileOutputStream f2=new FileOutputStream("SEnc.dat");
        f2.write(ctext);
   }
}