php实现AES/CBC/PKCS5Padding加密解密（又叫：对称加密）-1

配合java程序接口的架接，java那边需要我这边对传过去的值进行AES对称加密，接口返回的结果也是加密过的（就要用到解密），然后试了很多办法，也一一对应了AES的key密钥值，偏移量（IV）的值，都还是不能和java加密解密的结果一样。接着我就去找了一些文档，结果发现PHP里面补码方式只有：ZeroPadding这一种方式，而java接口那边是用PKCS5Padding补码方式，发现了问题所在，就编写了如下PHP实现AES/CBC/PKCS5Padding的加密解密方式。如有错误，还请指正！

 1 <?php
 2  
 3 class MagicCrypt {
 4     private $iv = "0102030405060708";//密钥偏移量IV，可自定义
 5  
 6     private $encryptKey = "自定义16位长度key";//AESkey，可自定义
 7  
 8     //加密
 9     public function encrypt($encryptStr) {
10         $localIV = $this->iv;
11         $encryptKey = $this->encryptKey;
12  
13         //Open module
14         $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);
15  
16         //print "module = $module <br/>" ;
17  
18         mcrypt_generic_init($module, $encryptKey, $localIV);
19  
20         //Padding
21         $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
22         $pad = $block - (strlen($encryptStr) % $block); //Compute how many characters need to pad
23         $encryptStr .= str_repeat(chr($pad), $pad); // After pad, the str length must be equal to block or its integer multiples
24  
25         //encrypt
26         $encrypted = mcrypt_generic($module, $encryptStr);
27  
28         //Close
29         mcrypt_generic_deinit($module);
30         mcrypt_module_close($module);
31  
32         return base64_encode($encrypted);
33  
34     }
35  
36     //解密
37     public function decrypt($encryptStr) {
38         $localIV = $this->iv;
39         $encryptKey = $this->encryptKey;
40  
41         //Open module
42         $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);
43  
44         //print "module = $module <br/>" ;
45  
46         mcrypt_generic_init($module, $encryptKey, $localIV);
47  
48         $encryptedData = base64_decode($encryptStr);
49         $encryptedData = mdecrypt_generic($module, $encryptedData);
50  
51         return $encryptedData;
52     }
53 }
54 $encryptString = 'gz1DR+BsCzQe55HFdq1IiQ==';
55 $encryptObj = new MagicCrypt();
56  
57 $result = $encryptObj->encrypt($encryptString);//加密结果
58 $decryptString = $decryptString = $encryptObj->decrypt($result);//解密结果
59 echo $result . "<br/>";
60 echo $decryptString . "<br/>";
61 ?>