DES加密算法工具类

package com.julongtech.config.util;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;
import org.apache.log4j.Logger;

/**
 * DES加密算法
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24上午11:41:21
 */
public class DESUtil {
private static final Logger logger = Logger.getLogger(DESUtil.class);
private static KeyGenerator keyGenerator = null;
/**
 * DES加密
 * @param data 加密字符串
 * @param key 密钥 长度为8的倍数
 * @return byte[]
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24上午11:57:04
 */
public static byte[] encryptMode(String data,String key){
try {
keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);
//获取key
DESKeySpec desKey = new DESKeySpec(key.getBytes());
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
Key convertKey  = secretKeyFactory.generateSecret(desKey);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertKey);
return  cipher.doFinal(data.getBytes());
} catch (Exception e) {
// TODO Auto-generated catch block
logger.error("【DESUtil】加密发生异常",e);
}
return null;
}

/**
 * byte[]字符串转16进制
 * @param bytes
 * @return String
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24下午01:52:36
 */
public static String encodeHex(byte[] bytes){
char[] value = Hex.encodeHex(bytes);
return new String(value);
}
/**
 * 16进制转换为 
 * @param data
 * @return byte[]
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24下午02:40:00
 */
public static byte[] decodeHex(char[] data){
try {
return Hex.decodeHex(data);
} catch (DecoderException e) {
// TODO Auto-generated catch block
logger.error("【DESUtil】16进制发生异常",e);
}
return null;
}

/**
 * DES解密算法
 * @param data 加密数据
 * @param key 密钥 长度为8的倍数
 * @return byte[]
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24下午02:00:06
 */
public static byte[] decryptMode(byte[] data,String key){
try {
keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);
//获取key
DESKeySpec desKey = new DESKeySpec(key.getBytes());
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
Key convertKey  = secretKeyFactory.generateSecret(desKey);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, convertKey);
return cipher.doFinal(data);
} catch (Exception e) {
// TODO: handle exception
logger.error("【DESUtil】解密发生异常",e);
}
return null;
}

/**
 * 格式化为byte[] to  String 
 * @param bytes
 * @return String
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24下午02:02:29
 */
public static String formatByteToString(byte[] bytes){
return new String(bytes);
}


/**
 * DES 加密
 * @param data 加密的数据
 * @param key 秘钥
 * @return String
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24下午02:20:16
 */
public static String encrypt(String data,String key){
byte[]  bytes = encryptMode(data, key);
return encodeHex(bytes);
}

/**
 * DES 解密
 * @param data 加密的数据
 * @param key 秘钥
 * @return String
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-24下午02:23:49
 */
public static String decrypt(String data,String key){
byte[] b = decodeHex(data.toCharArray());
byte[] bytes = decryptMode(b, key);
return formatByteToString(bytes);
}

/**
 * @param args
 * @author julong
 * @QQ 330359149 
 * @Email [e-mail]
 * @date 2016-8-23下午09:25:02
 */
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
String str1 = DESUtil.encrypt("12345julong", "111111110000000022222222");
System.out.println(str1);
String str2 = DESUtil.decrypt(str1, "111111110000000022222222");
System.out.println(str2);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}