RSA Crypto

<?php

include "./Flash/RSA_XML.php";
//include "./config.php";
class Crypto extends Crypt_RSA {

    public function loadKeyfromXML($key)
    {
	$xml = new DOMDocument();
	$xml->loadXML($key);

	$modulus = new Math_BigInteger(base64_decode($xml->getElementsByTagName('Modulus')->item(0)->nodeValue), 256);
	$exponent = new Math_BigInteger(base64_decode($xml->getElementsByTagName('Exponent')->item(0)->nodeValue), 256);

	$this->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
	$this->modulus = $modulus;
	$this->exponent = $exponent;
	$this->publicExponent = $exponent;
	$this->k = strlen($this->modulus->toBytes());

	if(isset($xml->getElementsByTagName('D')->item(0)->nodeValue)
		&& isset($xml->getElementsByTagName('InverseQ')->item(0)->nodeValue)) {
	    $d = new Math_BigInteger(base64_decode($xml->getElementsByTagName('D')->item(0)->nodeValue), 256);
	    $dp = new Math_BigInteger(base64_decode($xml->getElementsByTagName('DP')->item(0)->nodeValue), 256);
	    $dq = new Math_BigInteger(base64_decode($xml->getElementsByTagName('DQ')->item(0)->nodeValue), 256);
	    $inverseq = new Math_BigInteger(base64_decode($xml->getElementsByTagName('InverseQ')->item(0)->nodeValue), 256);
	    $p = new Math_BigInteger(base64_decode($xml->getElementsByTagName('P')->item(0)->nodeValue), 256);
	    $q = new Math_BigInteger(base64_decode($xml->getElementsByTagName('Q')->item(0)->nodeValue), 256);

	    $this->exponents = array(1=> $dp, $dq);
	    $this->coefficients = array(2 => $inverseq);
	    $this->primes = array(1 => $p, $q);
	}

    }
}
define(RSA_PRIVATE_KEY,"<RSAKeyValue><Modulus>zRSdzFcnZjOCxDMkWUbuRgiOZIQlk7frZMhElQ0a7VqZI9VgU3+lwo0ghZLU3Gg63kOY2UyJ5vFpQdwJUQydsF337ZAUJz4rwGRt/MNL70wm71nGfmdPv4ING+DyJ3ZxFawwE1zSMjMOqQtY4IV8his/HlgXuUfIHVDK87nMNLc=</Modulus><Exponent>AQAB</Exponent><P>7lzjJCmL0/unituEcjoJsZhUDYajgiiIwWwuh0NlCZElmfa5M6l8H+Ahd9yo7ruT6Hrwr4DAdrIKP6LDmFhBdw==</P><Q>3EFKHt4FcDiZXRBLqYZaNSmM1KDrrU97N3CtEDCYS4GimmFOGJhmuK3yGfp/nYLcL2BTKyOZLSQO+/nAjRp2wQ==</Q><DP>SFdkkGsThuiPdrMcxVYb7wxeJiTApxYKOznL/T1VAsxMbyfUGXvMshfh0HDlzF6diycUuQ8IWn26YonRdwECDQ==</DP><DQ>xR9x1NpkB6HAMHhLHzftODMtpYc4Jm5CGsYvPZQgWUN2YbDAkmajWJnlWbbFzBS4N3aAONWtW6cv+ff2itKqgQ==</DQ><InverseQ>oyJzP0Sn+NgdNRRc7/cUKkbbbYaNxkDLDvKLDYMKV6+gcDce85t/FGfaTwkuYQNFqkrRBtDYjtfGsPRTGS6Mow==</InverseQ><D>wM33JNtzUSRwdmDWdZC4BuOYa2vJoD0zc0bNI4x0ml2oyAWdUCMcBfKEds/6i1T6s2e91d2dcJ/aI27o22gO/sfNg3tsr7uYMiUuhSjniqBDB/zyUVig29E4qdfuY1GHxTE8zurroY8mgGEB0aLj+gE0yX9T7sDFkY0QYRqJnwE=</D></RSAKeyValue>");
$Crypto = new Crypto();
$Crypto->loadKeyfromXML(RSA_PRIVATE_KEY);
$Data = strrev(base64_decode($_GET["p"]));
echo $Crypto->decrypt($Data);
?>