DES根据键值加密解密

import java.io.IOException;
import java.net.URLEncoder;
import java.security.SecureRandom;

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

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

public class DesUtil {

    private final static String DES = "DES";

    /**
     * 
     * Description 根据键值进行加密
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */

    public static String encrypt(String data, String key) throws Exception {

        byte[] bt = encrypt(data.getBytes("utf-8"), key.getBytes());

        String strs = new BASE64Encoder().encode(bt);

        return strs;

    }

    /**
     * 
     * Description 根据键值进行解密
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */

    public static String decrypt(String data, String key) throws IOException,Exception {
        if (data == null)
            return null;
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] buf = decoder.decodeBuffer(data);
        byte[] bt = decrypt(buf, key.getBytes());
        return new String(bt, "utf-8");

    }

    /**
     * 
     * Description 根据键值进行加密
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */

    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {

        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);

    }

    /**
     * 
     * Description 根据键值进行解密
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */

    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    public static void main(String[] args) throws Exception {
        String period = "validateKey=123456789";   
        period = DesUtil.encrypt(period, "aopencom");
        period = URLEncoder.encode(period, "UTF-8").replace("*","*").replace("~", "~").replace("+"," ");
        System.out.println(period);
        
    }

}