content: /**
   *  (C) 2010-2022 Alibaba Group Holding Limited.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alibaba.datax.common.util;
  
  import javax.crypto.Cipher;
  import javax.crypto.SecretKey;
  import javax.crypto.SecretKeyFactory;
  import javax.crypto.spec.DESKeySpec;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.security.SecureRandom;
  
  /**
   * DES加解密,支持与delphi交互(字符串编码需统一为UTF-8)
   * 将这个工具类抽取到 common 中，方便后续代码复用
   */
  public class DESCipher {
  	private static Logger LOGGER = LoggerFactory.getLogger(DESCipher.class);
  	/**
  	 * 密钥
  	 */
  	public static final String KEY = "";
  	private final static String DES = "DES";
  
  	/**
  	 * 加密
  	 * @param src 明文(字节) 
  	 * @param key 密钥，长度必须是8的倍数
  	 * @return 密文(字节)
  	 * @throws Exception
  	 */
  	public static byte[] encrypt(byte[] src, byte[] key) throws Exception {
  		// DES算法要求有一个可信任的随机数源
  		SecureRandom sr = new SecureRandom();
  		
  		// 从原始密匙数据创建DESKeySpec对象
  		DESKeySpec dks = new DESKeySpec(key);
  		
  		// 创建一个密匙工厂，然后用它把DESKeySpec转换成
  		// 一个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);
  
  		// 用密匙初始化Cipher对象
  		cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
  
  		// 现在，获取数据并加密
  		// 正式执行加密操作
  		return cipher.doFinal(src);
  	}
  
  	/**
  	 * * 解密
  	 * * @param src
  	 * * 密文(字节)
  	 * * @param key
  	 * * 密钥，长度必须是8的倍数
  	 * * @return 明文(字节)
  	 * * @throws Exception
  	 */
  	public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
  		// DES算法要求有一个可信任的随机数源
  		SecureRandom sr = new SecureRandom();
  
  		// 从原始密匙数据创建一个DESKeySpec对象
  		DESKeySpec dks = new DESKeySpec(key);
  
  		// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
  		// 一个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);
  
  		// 用密匙初始化Cipher对象
  		cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
  
  		// 现在，获取数据并解密
  		// 正式执行解密操作
  		return cipher.doFinal(src);
  	}
  
  	/**
  	 * 加密
  	 * @param src * 明文(字节)
  	 * @return 密文(字节)
  	 * @throws Exception
  	 */
  	public static byte[] encrypt(byte[] src) throws Exception {
  		return encrypt(src, KEY.getBytes());
  	}
  
  	/**
  	 * 解密
  	 * @param src 密文(字节)
  	 * @return 明文(字节)
  	 * @throws Exception
  	 */
  	public static byte[] decrypt(byte[] src) throws Exception {
  		return decrypt(src, KEY.getBytes());
  	}
  
  	/**
  	 * 加密
  	 * @param src 明文(字符串)
  	 * @return 密文(16进制字符串)
  	 * @throws Exception
  	 */
  	public final static String encrypt(String src) {
  		try {
  			return byte2hex(encrypt(src.getBytes(), KEY.getBytes()));
  		} catch (Exception e) {
  			LOGGER.warn(e.getMessage(), e);
  		}
  		return null;
  	}
  	
  	/**
  	 * 加密
  	 * @param src 明文(字符串)
  	 * @param encryptKey 加密用的秘钥
  	 * @return 密文(16进制字符串)
  	 * @throws Exception
  	 */
  	public final static String encrypt(String src, String encryptKey) {
  		try {
  			return byte2hex(encrypt(src.getBytes(), encryptKey.getBytes()));
  		} catch (Exception e) {
  			LOGGER.warn(e.getMessage(), e);
  		}
  		return null;
  	}
  
  	/**
  	 * 解密
  	 * @param src 密文(字符串)
  	 * @return 明文(字符串)
  	 * @throws Exception
  	 */
  	public final static String decrypt(String src) {
  		try {
  			return new String(decrypt(hex2byte(src.getBytes()), KEY.getBytes()));
  		} catch (Exception e) {
  			LOGGER.warn(e.getMessage(), e);
  		}
  		return null;
  	}
  	
  	/**
  	 * 解密
  	 * @param src 密文(字符串)
  	 * @param decryptKey 解密用的秘钥
  	 * @return 明文(字符串)
  	 * @throws Exception
  	 */
  	public final static String decrypt(String src, String decryptKey) {
  		try {
  			return new String(decrypt(hex2byte(src.getBytes()), decryptKey.getBytes()));
  		} catch (Exception e) {
  			LOGGER.warn(e.getMessage(), e);
  		}
  		return null;
  	}
  
  	/**
  	 * 加密
  	 * @param src
  	 * 明文(字节)
  	 * @return 密文(16进制字符串)
  	 * @throws Exception
  	 */
  	public static String encryptToString(byte[] src) throws Exception {
  		return encrypt(new String(src));
  	}
  
  	/**
  	 * 解密
  	 * @param src 密文(字节)
  	 * @return 明文(字符串)
  	 * @throws Exception
  	 */
  	public static String decryptToString(byte[] src) throws Exception {
  		return decrypt(new String(src));
  	}
  
  	public static String byte2hex(byte[] b) {
  		String hs = "";
  		String stmp = "";
  		for (int n = 0; n < b.length; n++) {
  			stmp = (Integer.toHexString(b[n] & 0XFF));
  			if (stmp.length() == 1)
  				hs = hs + "0" + stmp;
  			else
  				hs = hs + stmp;
  		}
  		return hs.toUpperCase();
  	}
  
  	public static byte[] hex2byte(byte[] b) {
  		if ((b.length % 2) != 0)
  			throw new IllegalArgumentException("The length is not an even number");
  		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;
  	}
  }
  