package com.cjs.site.util.web;

import java.io.IOException;
import java.security.SecureRandom;
import java.util.Random;

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

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.RandomUtils;

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

/**
 * 汇付天下，加密解密
 * 
 * @author tongyufu
 *
 */
public class DesUtil {

    private final static String DES = "DES";
    public static final String  KEY = "ZHAOYN_WEB_UP";

    public static void main(String[] args) throws Exception {
        //String data = "{uid: \"80018500\", pwd: \"111111\"}";
        String data = "v9OZqooWMhI=";
        String key = "ZHAOYN_WEB_UP";
        System.err.println(decrypt(data, key));
        System.err.println(decrypt(encrypt(data, key), key));
        Random ran=new Random();
        long a=RandomUtils.nextLong(1, 10);
        System.out.println(System.currentTimeMillis());
    }

    /**
     * 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(), 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);
    }

    /**
     * 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);
    }
    
    /**MD5加密*/
    public static String MD5(String str) {
    	return DigestUtils.md5Hex(str);
    }
}