希望将此JAVA/PHP加密代码转换为C#

我在PHP工作，希望将一段与加密相关的代码从JAVA/PHP转换为C#，我是C#新手，有人能帮我吗？

代码选自http://www.androidsnippets.com/encrypt-decrypt-between-android-and-php

也给出如下-请帮助我：

========================================

/****//PHP/

    <?php 
    class MCrypt
    {
            private $iv = 'fedcba9876543210'; #Same as in JAVA
            private $key = '0123456789abcdef'; #Same as in JAVA

            function __construct()
            {
            }
            function encrypt($str) {
              //$key = $this->hex2bin($key);    
              $iv = $this->iv;
              $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
              mcrypt_generic_init($td, $this->key, $iv);
              $encrypted = mcrypt_generic($td, $str);
              mcrypt_generic_deinit($td);
              mcrypt_module_close($td);
              return bin2hex($encrypted);
            }
            function decrypt($code) {
              //$key = $this->hex2bin($key);
              $code = $this->hex2bin($code);
              $iv = $this->iv;
              $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
              mcrypt_generic_init($td, $this->key, $iv);
              $decrypted = mdecrypt_generic($td, $code);
              mcrypt_generic_deinit($td);
              mcrypt_module_close($td);
              return utf8_encode(trim($decrypted));
            }
            protected function hex2bin($hexdata) {
              $bindata = '';
              for ($i = 0; $i < strlen($hexdata); $i += 2) {
                    $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
              }
              return $bindata;
            }
    }