function verifyPss($text, $sig, $pubkeystr)
{
$pubkeyarray = explode(' ', $pubkeystr);
$rsa = new rsaMyExts();
$rsa->loadKey(array('n' => new Math_BigInteger($pubkeyarray[0], 16), 'e' => new Math_BigInteger($pubkeyarray[1], 16)));
$rsa->setHash('sha256');
$rsa->setMGFHash('sha256');
$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PSS);
$rsa->setSaltLength(0);
$sigBigInt = new Math_BigInteger($sig, 16);
$sigBin = $rsa->_i2osp($sigBigInt, ceil(strlen($sig) / 2));
$sigOk = $rsa->verify($text, $sigBin);
return $sigOk;
}
