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！

<?php
 
class MagicCrypt {
    private $iv = "0102030405060708";//密钥偏移量IV，可自定义
 
    private $encryptKey = "自定义16位长度key";//AESkey，可自定义
 
    //加密
    public function encrypt($encryptStr) {
        $localIV = $this->iv;
        $encryptKey = $this->encryptKey;
 
        //Open module
        $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);
 
        //print "module = $module <br/>" ;
 
        mcrypt_generic_init($module, $encryptKey, $localIV);
 
        //Padding
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $pad = $block - (strlen($encryptStr) % $block); //Compute how many characters need to pad
        $encryptStr .= str_repeat(chr($pad), $pad); // After pad, the str length must be equal to block or its integer multiples
 
        //encrypt
        $encrypted = mcrypt_generic($module, $encryptStr);
 
        //Close
        mcrypt_generic_deinit($module);
        mcrypt_module_close($module);
 
        return base64_encode($encrypted);
 
    }
 
    //解密
    public function decrypt($encryptStr) {
        $localIV = $this->iv;
        $encryptKey = $this->encryptKey;
 
        //Open module
        $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);
 
        //print "module = $module <br/>" ;
 
        mcrypt_generic_init($module, $encryptKey, $localIV);
 
        $encryptedData = base64_decode($encryptStr);
        $encryptedData = mdecrypt_generic($module, $encryptedData);
 
        return $encryptedData;
    }
}
$encryptString = 'gz1DR+BsCzQe55HFdq1IiQ==';
$encryptObj = new MagicCrypt();
 
$result = $encryptObj->encrypt($encryptString);//加密结果
$decryptString = $decryptString = $encryptObj->decrypt($result);//解密结果
echo $result . "<br/>";
echo $decryptString . "<br/>";
?>