<"";
		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;
 
"htmlcode">

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"));
 }
}


PS：关于加密技术，本站还提供了如下加密工具供大家参考使用：
MD5在线加密工具：http://tools.jb51.net/password/CreateMD5Password
Escape加密/解密工具：http://tools.jb51.net/password/escapepwd
在线SHA1加密工具：http://tools.jb51.net/password/sha1encode
短链(短网址)在线生成工具：http://tools.jb51.net/password/dwzcreate
短链(短网址)在线还原工具：http://tools.jb51.net/password/unshorturl
高强度密码生成器：http://tools.jb51.net/password/CreateStrongPassword