MD5加密解密方法

package com.gionee.bis.utils;


import java.security.Key;
import java.security.SecureRandom;


import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;


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


public class MD5Util {
private static Key key;

public static MD5Util maMd5Util = new MD5Util();


public MD5Util() {
this.getKey("gionee");
}


/**
* 根据参数生成KEY
* 
* @param strKey
*/
public void getKey(String strKey) {
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
_generator.init(new SecureRandom(strKey.getBytes()));
this.key = _generator.generateKey();
_generator = null;
} catch (Exception e) {
e.printStackTrace();
}
}


/**
* 加密String明文输入,String密文输出
* 
* @param strMing
* @return
*/
public static String getEncString(String strMing) {
byte[] byteMi = null;
byte[] byteMing = null;
String strMi = "";
BASE64Encoder base64en = new BASE64Encoder();
try {
byteMing = strMing.getBytes("UTF-8");
byteMi = getEncCode(byteMing);
strMi = base64en.encode(byteMi);
} catch (Exception e) {
e.printStackTrace();
} finally {
base64en = null;
byteMing = null;
byteMi = null;
}
return strMi;
}


/**
* 解密 以String密文输入,String明文输出
* 
* @param strMi
* @return
*/
public static String getDesString(String strMi) {
BASE64Decoder base64De = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
try {
byteMi = base64De.decodeBuffer(strMi);
byteMing = getDesCode(byteMi);
strMing = new String(byteMing, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
base64De = null;
byteMing = null;
byteMi = null;
}
return strMing;
}


/**
* 加密以byte[]明文输入,byte[]密文输出
* 
* @param byteS
* @return
*/
private static  byte[] getEncCode(byte[] byteS) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byteS);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}


/**
* 解密以byte[]密文输入,以byte[]明文输出
* 
* @param byteD
* @return
*/
private static  byte[] getDesCode(byte[] byteD) {
Cipher cipher;
byte[] byteFina = null;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}

public static void main(String[] args) {
String s = "test";
String s_code = getEncString(s);
System.out.println(s_code);
String s_des = getDesString(s_code);
System.out.println(s_des);
}
}