/**
* (C) 2010-2014 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.plugin.reader.odpsreader.util;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
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)
*
* *
*
* * @author wym
*
*
*/
public class DESCipher {
/**
* * 密钥
*
*
*/
public static final String KEY = "u4Gqu4Z8";
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) {
e.printStackTrace();
}
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) {
e.printStackTrace();
}
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("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;
}
/*
* public static void main(String[] args) { try { String src = "cheetah";
* String crypto = DESCipher.encrypt(src); System.out.println("密文[" + src +
* "]:" + crypto); System.out.println("解密后:" + DESCipher.decrypt(crypto)); }
* catch (Exception e) { e.printStackTrace(); } }
*/
}