sdeccbc.java

很好的解密算法

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


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


         FileInputStream f=new FileInputStream("SEncCBC.dat");
         byte[] rand=new byte[8];
         f.read(rand);
         IvParameterSpec iv=new IvParameterSpec(rand);

        int num=f.available();
        byte[ ] ctext=new byte[num];          
        f.read(ctext);

	FileInputStream f2=new FileInputStream("key1.dat");
	ObjectInputStream b=new ObjectInputStream(f2);
	Key k=(Key)b.readObject( );

  	Cipher cp=Cipher.getInstance("DESede/CBC/PKCS5Padding");
       cp.init(Cipher.DECRYPT_MODE, k, iv);
       byte []ptext=cp.doFinal(ctext);
       String p=new String(ptext,"UTF8");
       System.out.println(p);
   }
}