sdec.java

使用DES方法加解密

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;


public class SDec{
   public static void main(String args[]) throws Exception{

/*
byte [ ] keykb ={11,-105,-119,50,4,-105,16,38,-14,-111,21,-95,
70,-15,76,-74,67,-88,59,-71,55,-125,104,42};
byte ctext[ ]={-57,119,0,-45,-9,23,37,-56,-60,-34,-99,105,99,113,-17,76};
*/

        FileInputStream f=new FileInputStream("SEnc.dat");
        int num=f.available();
        byte[ ] ctext=new byte[num];          
        f.read(ctext);

        FileInputStream  f2=new FileInputStream("keykb1.dat");
        int num2=f2.available();
        byte[ ] keykb=new byte[num2];          
        f2.read(keykb);

        

        SecretKeySpec k=new  SecretKeySpec(keykb,"DESede");



       Cipher cp=Cipher.getInstance("DESede");
       cp.init(Cipher.DECRYPT_MODE, k);
       byte []ptext=cp.doFinal(ctext);
       String p=new String(ptext,"UTF8");
       System.out.println(p);


   }
}