/**
* Sign a message, using your secret key
*
* @param string|resource $sealed
* @param EncryptionPublicKey $publicKey
* @return string
*/
public function signAsymmetric($message, SignatureSecretKey $secretKey, array $options = []) : string
{
$signature = '';
$signed = \openssl_sign($message, $signature, $secretKey->getPEM(), 'sha384WithRSAEncryption');
if ($signed) {
return binhex($signature);
}
}
