加密解密工具类 EncryptUtil

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

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

public class EncryptUtil {
 // 密钥是16位长度的byte[]进行Base64转换后得到的字符串
 public static String key ="LmMGStGtOpF4xNyvYt54EQ==";

 
 public static String encrypt(String xmlStr){
  byte[] encrypt = null;

  try {
   //取需要加密内容的utf-8编码。
   encrypt =xmlStr.getBytes("utf-8");
  } catch(UnsupportedEncodingException e) {
   e.printStackTrace();
  }
  // 取MD5Hash码，并组合加密数组
  byte[] md5Hasn = null;
  try {
   md5Hasn =EncryptUtil.MD5Hash(encrypt, 0, encrypt.length);
  } catch (Exception e) {
   e.printStackTrace();
  }
  // 组合消息体
  byte[] totalByte =EncryptUtil.addMD5(md5Hasn, encrypt);

  // 取密钥和偏转向量
  byte[] key = new byte[8];
  byte[] iv = new byte[8];
  getKeyIV(EncryptUtil.key, key,iv);
  SecretKeySpec deskey = newSecretKeySpec(key, "DES");
  IvParameterSpec ivParam = newIvParameterSpec(iv);

  // 使用DES算法使用加密消息体
  byte[] temp = null;
  try {
   temp =EncryptUtil.DES_CBC_Encrypt(totalByte, deskey, ivParam);
  } catch (Exception e) {
   e.printStackTrace();
  }

  // 使用Base64加密后返回
  return newBASE64Encoder().encode(temp);
 }

 
 public static String decrypt(String xmlStr)throws Exception {
  // base64解码
  BASE64Decoder decoder = newBASE64Decoder();
  byte[] encBuf = null;
  try {
   encBuf =decoder.decodeBuffer(xmlStr);
  } catch (IOException e) {
   e.printStackTrace();
  }

  // 取密钥和偏转向量
  byte[] key = new byte[8];
  byte[] iv = new byte[8];
  getKeyIV(EncryptUtil.key, key,iv);

  SecretKeySpec deskey = newSecretKeySpec(key, "DES");
  IvParameterSpec ivParam = newIvParameterSpec(iv);

  // 使用DES算法解密
  byte[] temp = null;
  try {
   temp =EncryptUtil.DES_CBC_Decrypt(encBuf, deskey, ivParam);
  } catch (Exception e) {
   e.printStackTrace();
  }

  // 进行解密后的md5Hash校验
  byte[] md5Hash = null;
  try {
   md5Hash =EncryptUtil.MD5Hash(temp, 16, temp.length - 16);
  } catch (Exception e) {
   e.printStackTrace();
  }

  // 进行解密校检
  for (int i = 0; i <md5Hash.length; i++) {
   if(md5Hash[i] != temp[i]) {
    //System.out.println(md5Hash[i] + "MD5校验错误。" + temp[i]);
    thrownew Exception("MD5校验错误。");
   }
  }

  //返回解密后的数组，其中前16位MD5Hash码要除去。
  return new String(temp, 16,temp.length - 16, "utf-8");
 }

 
 public static byte[] TripleDES_CBC_Encrypt(byte[]sourceBuf,
   SecretKeySpecdeskey, IvParameterSpec ivParam) throws Exception {
  byte[] cipherByte;
  // 使用DES对称加密算法的CBC模式加密
  Cipher encrypt =Cipher.getInstance("TripleDES/CBC/PKCS5Padding");

  encrypt.init(Cipher.ENCRYPT_MODE,deskey, ivParam);

  cipherByte =encrypt.doFinal(sourceBuf, 0, sourceBuf.length);
  // 返回加密后的字节数组
  return cipherByte;
 }

 
 public static byte[] TripleDES_CBC_Decrypt(byte[]sourceBuf,
   SecretKeySpecdeskey, IvParameterSpec ivParam) throws Exception {

  byte[] cipherByte;
  // 获得Cipher实例，使用CBC模式。
  Cipher decrypt =Cipher.getInstance("TripleDES/CBC/PKCS5Padding");
  //初始化加密实例，定义为解密功能，并传入密钥，偏转向量
  decrypt.init(Cipher.DECRYPT_MODE,deskey, ivParam);

  cipherByte =decrypt.doFinal(sourceBuf, 0, sourceBuf.length);
  // 返回解密后的字节数组
  return cipherByte;
 }

 
 public static byte[] DES_CBC_Encrypt(byte[]sourceBuf,
   SecretKeySpecdeskey, IvParameterSpec ivParam) throws Exception {
  byte[] cipherByte;
  // 使用DES对称加密算法的CBC模式加密
  Cipher encrypt =Cipher.getInstance("DES/CBC/PKCS5Padding");

  encrypt.init(Cipher.ENCRYPT_MODE,deskey, ivParam);

  cipherByte =encrypt.doFinal(sourceBuf, 0, sourceBuf.length);
  // 返回加密后的字节数组
  return cipherByte;
 }

 
 public static byte[] DES_CBC_Decrypt(byte[]sourceBuf,
   SecretKeySpecdeskey, IvParameterSpec ivParam) throws Exception {

  byte[] cipherByte;
  // 获得Cipher实例，使用CBC模式。
  Cipher decrypt =Cipher.getInstance("DES/CBC/PKCS5Padding");
  //初始化加密实例，定义为解密功能，并传入密钥，偏转向量
  decrypt.init(Cipher.DECRYPT_MODE,deskey, ivParam);

  cipherByte =decrypt.doFinal(sourceBuf, 0, sourceBuf.length);
  // 返回解密后的字节数组
  return cipherByte;
 }

 
 public static byte[] MD5Hash(byte[] buf, intoffset, int length)
   throwsException {
  MessageDigest md =MessageDigest.getInstance("MD5");
  md.update(buf, offset,length);
  return md.digest();
 }

 
 public static String byte2hex(byte[] inStr){
  String stmp;
  StringBuffer out = newStringBuffer(inStr.length * 2);

  for (int n = 0; n <inStr.length; n++) {
   //字节做"与"运算，去除高位置字节 11111111
   stmp =Integer.toHexString(inStr[n] & 0xFF);
   if(stmp.length() == 1) {
    //如果是0至F的单位字符串，则添加0
    out.append("0"+ stmp);
   } else{
    out.append(stmp);
   }
  }
  return out.toString();
 }

 
 public static byte[] addMD5(byte[] md5Byte,byte[] bodyByte) {
  int length = bodyByte.length +md5Byte.length;
  byte[] resutlByte = newbyte[length];

  // 前16位放MD5Hash码
  for (int i = 0; i < length;i++) {
   if (i <md5Byte.length) {
    resutlByte[i]= md5Byte[i];
   } else{
    resutlByte[i]= bodyByte[i - md5Byte.length];
   }
  }

  return resutlByte;
 }

 
 public static void getKeyIV(String encryptKey,byte[] key, byte[] iv) {
  // 密钥Base64解密
  BASE64Decoder decoder = newBASE64Decoder();
  byte[] buf = null;
  try {
   buf =decoder.decodeBuffer(encryptKey);
  } catch (IOException e) {
   e.printStackTrace();
  }
  // 前8位为key
  int i;
  for (i = 0; i < key.length;i++) {
   key[i] =buf[i];
  }
  // 后8位为iv向量
  for (i = 0; i < iv.length;i++) {
   iv[i] = buf[i+ 8];
  }
 }
 
 public static void main(String[] args) {
  System.out.println(encrypt("123456"));
 }
}

调用方法：

 String encryptPassword = EncryptUtil.encrypt(password);