http://www.pocketdigi.com/20121112/940.html

原文：http://toptulip.iteye.com/blog/780309 使用php加密字符串，生成密文，java解析密文還原字符串.
Java的部分直接復制調不通，改了下，下面的代碼是能正常運行的。
php:

<?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)); //返回大寫十六進制字符串

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;

?

?>

?

java:

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 加密私鑰，長度不能夠小于8位

* @return 加密后的字節數組，一般結合Base64編碼使用

* @throws CryptException 異常

*/

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 加密私鑰，長度不能夠小于8位

* @return 加密后的字節數組，一般結合Base64編碼使用

* @throws CryptException 異常

*/

public static String encode(String key,byte[] data) throws Exception

{

try

{

DESKeySpec dks = new DESKeySpec(key.getBytes());

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

//key的長度不能夠小于8位字節

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 解密私鑰，長度不能夠小于8位

* @return 解密后的字節數組

* @throws Exception 異常

*/

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的長度不能夠小于8位字節

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);

}

}

/**

* 獲取編碼后的值

* @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"));

}

}

?

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