static function verifySigKey($hash, $sig, $pubkey)
{
$rsa = new rsaMyExts();
$rsa->loadKey($pubkey);
$hashBI = new Math_BigInteger($hash, 16);
$sigBI = new Math_BigInteger($sig, 16);
if ($sigBI->compare($rsa->zero) < 0 || $sigBI->compare($rsa->modulus) > 0) {
return false;
}
// the signature has more bits than the modulus --> the signature cannot has been created by the given key and the exponentiation cannot be performed.
$verify = $rsa->_rsaep($sigBI);
if ($hashBI->equals($verify)) {
return true;
}
WrongRequestException::throwException(1001, "Error: signature verifcation failed", "verifySig: given hash: {$hash}, calculated hash: " . $verify->toHex());
}
