/**
* @param BufferInterface $signature
* @return bool
* @throws ScriptRuntimeException
* @throws \Exception
*/
public function isLowDerSignature(BufferInterface $signature)
{
if (!$this->isValidSignatureEncoding($signature)) {
throw new ScriptRuntimeException(Interpreter::VERIFY_DERSIG, 'Signature with incorrect encoding');
}
$binary = $signature->getBinary();
$nLenR = ord($binary[3]);
$nLenS = ord($binary[5 + $nLenR]);
$s = $signature->slice(6 + $nLenR, $nLenS)->getInt();
return $this->adapter->validateSignatureElement($s, true);
}
