senccbc.java

很好的解密算法

import java.io.*;
import java.util.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
public class SEncCBC{
   public static void main(String args[]) throws Exception{
        String s="Hello123Hello123Hello123Hello123";

	FileInputStream f1=new FileInputStream("key1.dat");
	ObjectInputStream b=new ObjectInputStream(f1);
	Key k=(Key)b.readObject( );

        byte[] rand=new byte[8];  
        Random r=new Random( );
        r.nextBytes(rand);
        IvParameterSpec iv=new IvParameterSpec(rand);

  	Cipher cp=Cipher.getInstance("DESede/CBC/PKCS5Padding");
        cp.init(Cipher.ENCRYPT_MODE, k, iv);
        byte ptext[]=s.getBytes("UTF8");

        byte ctext[]=cp.doFinal(ptext);
        for(int i=0;i<ctext.length;i++){
             System.out.print(ctext[i] +",");
        }
	FileOutputStream f2=new FileOutputStream("SEncCBC.dat");
        f2.write(rand);
        f2.write(ctext);
   }
}