package ajax.des;

import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;



public class CryptoTools {
    private static final String key_ = "ising@ws";   //
    private static final byte [] DESkey = key_.getBytes();//设置密钥，略去
    private static final byte[] DESIV = { (byte)0x12,(byte) 0x34, (byte)0x56, (byte)0x78, (byte)0x90,
            (byte)0xAB, (byte)0xCD,(byte) 0xEF };//设置向量，略去

    private static AlgorithmParameterSpec iv =null;//加密算法的参数接口，IvParameterSpec是它的一个实现
    private static Key key =null;
   
    public  CryptoTools() throws  Exception {
         DESKeySpec keySpec = new DESKeySpec(DESkey);//设置密钥参数
         iv = new IvParameterSpec(DESIV);//设置向量
         SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");//获得密钥工厂
         key = keyFactory.generateSecret(keySpec);//得到密钥对象

    }

    public  String encode(String data) throws Exception {
        Cipher enCipher  =  Cipher.getInstance("DES/CBC/PKCS5Padding");//得到加密对象Cipher
        enCipher.init(Cipher.ENCRYPT_MODE,key,iv);//设置工作模式为加密模式，给出密钥和向量
        byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8"));
        BASE64Encoder base64Encoder = new BASE64Encoder();
        return base64Encoder.encode(pasByte);
    }

    public  String decode(String data) throws Exception{
        Cipher deCipher   =  Cipher.getInstance("DES/CBC/PKCS5Padding");
        deCipher.init(Cipher.DECRYPT_MODE,key,iv);
        BASE64Decoder base64Decoder = new BASE64Decoder();
        byte[] pasByte=deCipher.doFinal(base64Decoder.decodeBuffer(data));
        return new String(pasByte,"UTF-8");
    }
    public static void main(String[] args) throws Exception{
        String value = "hello";
        CryptoTools tools =new  CryptoTools();
        System.out.println(tools.encode(value));
        System.out.println("解密"+tools.decode(tools.encode(value)));
    }

} /> }
[/code]