Emarref\Jwt\Signature\Jws::getUnsignedValue PHP Method

    public function getUnsignedValue(Token $token)
    {
        $jsonHeader = $token->getHeader()->getParameters()->jsonSerialize();
        $encodedHeader = $this->encoder->encode($jsonHeader);
        $jsonPayload = $token->getPayload()->getClaims()->jsonSerialize();
        $encodedPayload = $this->encoder->encode($jsonPayload);
        return sprintf('%s.%s', $encodedHeader, $encodedPayload);
    }

 /**
  * @param Token $token
  * @throws InvalidSignatureException
  */
 public function verify(Token $token)
 {
     /** @var HeaderParameter\Algorithm $algorithmParameter */
     $algorithmParameter = $token->getHeader()->findParameterByName(HeaderParameter\Algorithm::NAME);
     if (null === $algorithmParameter) {
         throw new \RuntimeException('Algorithm parameter not found in token header.');
     }
     if ($algorithmParameter->getValue() !== $this->encryption->getAlgorithmName()) {
         throw new \RuntimeException(sprintf('Cannot use "%s" algorithm to decrypt token encrypted with algorithm "%s".', $this->encryption->getAlgorithmName(), $algorithmParameter->getValue()));
     }
     if (!$this->encryption->verify($this->signer->getUnsignedValue($token), $token->getSignature())) {
         throw new InvalidSignatureException();
     }
 }