package com.ego.util;

import java.security.Key;

import java.security.SecureRandom;

import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import javax.crypto.spec.IvParameterSpec;

public class DESCryption {

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;

// 带向量的DES加密方法

/**

 *

 * @param data 原文

 * @param DESkey key

 * @param DESIV 向量

 * @return 加密后转换成hex形式的密文字符串

 * @throws Exception

 */

public static String encode(String data, byte[] DESkey, byte[] DESIV)

		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

	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"));

	return byte2hex(pasByte);

}

// 带向量的DES解密方法

/**

 *

 * @param data 加密后转换成hex形式的密文字符串

 * @param DESkey key

 * @param DESIV 向量

 * @return 原文

 * @throws Exception

 */

public static String decode(String data, byte[] DESkey, byte[] DESIV)

		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

	Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

	deCipher.init(Cipher.DECRYPT_MODE, key, iv);

	byte[] buf = hex2byte(data.getBytes());

	byte[] pasByte = deCipher.doFinal(buf);

	return new String(pasByte);

}

//不带向量的DES加密方法

/**

 *

 * @param dataString 原文

 * @param keyString key

 * @return 加密后转换成hex形式的密文字符串

 * @throws Exception

 */

public static String encrypt(String dataString, String keyString) throws Exception {

	byte[] data = dataString.getBytes();

	byte[] key =keyString.getBytes();

	// 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);

    byte[] bt=cipher.doFinal(data);

    String strs=byte2hex(bt);

    return strs;

}

//不带向量的DES解密方法

/**

 *

 * @param dataString 加密后转换成hex形式的密文字符串

 * @param keyString key

 * @return 原文

 * @throws Exception

 */

 public static String decrypt(String dataString, String keyString)throws Exception{

        if (dataString == null)

            return null;

        byte[] dataHex = dataString.getBytes();

		byte[] key =keyString.getBytes();

        byte[] data = hex2byte(dataHex);

        // 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);

		byte[] bt = cipher.doFinal(data);

		return new String(bt);

    }

 /**

     * 十六进制字符转换成byte数组

     * @param string.getByte

     * @return

     */

    public static byte[] hex2byte(byte[] b) {

        if ((b.length % 2) != 0)

            throw new IllegalArgumentException("长度不是偶数");

        byte[] b2 = new byte[b.length / 2];

        for (int n = 0; n < b.length; n += 2) {

            String item = new String(b, n, 2);

            b2[n / 2] = (byte) Integer.parseInt(item, 16);

        }

        return b2;

    }

    /**

     * byte数组转换成16进制字符串

     * @param b

     * @return

     */

    public static String byte2hex(byte[] b) {

        String hs = "";

        String stmp = "";

        for (int n = 0; n < b.length; n++) {

            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));

            if (stmp.length() == 1)

                hs = hs + "0" + stmp;

            else

                hs = hs + stmp;

        }

        return hs.toUpperCase();

    }

// 测试

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

// String result=DESCryption.decode("59782316F0DA48F6C2CD6F4E0BE6580A37A98DF27B3E623B2D07D651FA9ED1204AA6ECC637A45725126D6F177F3ACA1EF0FB5AE27B230664","20161108".getBytes(),"20161108".getBytes());

// String result=DESCryption.decode("5C77BDA7EE8096AF5E8DE236DAD59038DB7B8C7A856B09E5703191843F1A4AA0AC36BB835057C661F61F40E945DBE786513ACA1BFDC7AB876FC49E0879C6D07B","20161108".getBytes(),"20161108".getBytes());

String result=DESCryption.encode("{'uid':'admin','pwd':'21232f297a57a5a743894a0e4a801fc3'}","20161108".getBytes(),"20161108".getBytes());

System.out.println(result);

}

}