<?php
class DES
{
 var $key;
 var $iv; //偏移量
 
 function DES($key, $iv=0)
 {
  $this->key = $key;
  if($iv == 0)
  {
   $this->iv = $key;
  }
  else 
  {
   $this->iv = $iv;
  }
 }
 
 //加密
 function encrypt($str)
 {  
  $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
  $str = $this->pkcs5Pad ( $str, $size );
 
  $data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv);
  //$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串
  return base64_encode($data);
 }
 
 //解密
 function decrypt($str)
 {
  $str = base64_decode ($str);
  //$strBin = $this->hex2bin( strtolower($str));
  $str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv );
  $str = $this->pkcs5Unpad( $str );
  return $str;
 }
 
 function hex2bin($hexData)
 {
  $binData = "";
  for($i = 0; $i < strlen ( $hexData ); $i += 2)
  {
   $binData .= chr(hexdec(substr($hexData, $i, 2)));
  }
  return $binData;
 }
 
 function pkcs5Pad($text, $blocksize)
 {
  $pad = $blocksize - (strlen ( $text ) % $blocksize);
  return $text . str_repeat ( chr ( $pad ), $pad );
 }
 
 function pkcs5Unpad($text)
 {
  $pad = ord ( $text {strlen ( $text ) - 1} );
  if ($pad > strlen ( $text ))
   return false;
  if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
   return false;
  return substr ( $text, 0, - 1 * $pad );
 }
}
$str = 'abcd';
$key= 'asdfwef5';
$crypt = new DES($key);
$mstr = $crypt->encrypt($str);
$str = $crypt->decrypt($mstr);
 
echo $str.' <=> '.$mstr;
 
?>

package com.test;
 
import it.sauronsoftware.base64.Base64;
 
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
 
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
 
public class Main
{
 public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
 /**
  * DES算法，加密
  *
  * @param data 待加密字符串
  * @param key 加密私钥，长度不能够小于8位
  * @return 加密后的字节数组，一般结合Base64编码使用
  * @throws CryptException 异常
  */
 public static String encode(String key,String data) throws Exception
 {
  return encode(key, data.getBytes());
 }
 /**
  * DES算法，加密
  *
  * @param data 待加密字符串
  * @param key 加密私钥，长度不能够小于8位
  * @return 加密后的字节数组，一般结合Base64编码使用
  * @throws CryptException 异常
  */
 public static String encode(String key,byte[] data) throws Exception
 {
  try
  {
   DESKeySpec dks = new DESKeySpec(key.getBytes());
 
   SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
   //key的长度不能够小于8位字节
   Key secretKey = keyFactory.generateSecret(dks);
   Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
   IvParameterSpec iv = new IvParameterSpec(key.getBytes());
   AlgorithmParameterSpec paramSpec = iv;
   cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
 
   byte[] bytes = cipher.doFinal(data);
 
 
//   return byte2hex(bytes);
   return new String(Base64.encode(bytes));
  } catch (Exception e)
  {
   throw new Exception(e);
  }
 }
 
 /**
  * DES算法，解密
  *
  * @param data 待解密字符串
  * @param key 解密私钥，长度不能够小于8位
  * @return 解密后的字节数组
  * @throws Exception 异常
  */
 public static byte[] decode(String key,byte[] data) throws Exception
 {
  try
  {
   SecureRandom sr = new SecureRandom();
   DESKeySpec dks = new DESKeySpec(key.getBytes());
   SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
   //key的长度不能够小于8位字节
   Key secretKey = keyFactory.generateSecret(dks);
   Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
   IvParameterSpec iv = new IvParameterSpec(key.getBytes());
   AlgorithmParameterSpec paramSpec = iv;
   cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
   return cipher.doFinal(data);
  } catch (Exception e)
  {
   throw new Exception(e);
  }
 }
 
 /**
  * 获取编码后的值
  * @param key
  * @param data
  * @return
  * @throws Exception
  */
 public static String decodeValue(String key,String data) 
 {
  byte[] datas;
  String value = null;
  try {
 
    datas = decode(key, Base64.decode(data.getBytes()));
 
   value = new String(datas);
  } catch (Exception e) {
   value = "";
  }
  return value;
 }
 
 public static void main(String[] args) throws Exception
 {
  System.out.println("明：abcd ；密：" + Main.encode("asdfwef5","abcd"));
 }
}