/** * {@inheritdoc} */ public function sign($payload, array $signature_protected_headers, Object\JWKInterface $signature_key) { $jws = Factory\JWSFactory::createJWS($payload); $jws = $jws->addSignatureInformation($signature_key, $signature_protected_headers); $this->signer->sign($jws); return $jws->toCompactJSON(0); }