/**
* Initialize signature algorithm from a JWK and a header.
*
* @param JWK $jwk JSON Web Key
* @param Header $header Header
* @return SignatureAlgorithm
*/
public static function fromJWK(JWK $jwk, Header $header)
{
$factory = new SignatureAlgorithmFactory($header);
return $factory->algoByKey($jwk);
}
/**
* Validate the signature using a key from the given JWK set.
*
* Correct key shall be sought by the key ID indicated by the header.
*
* @param JWKSet $set Set of JSON Web Keys
* @throws \RuntimeException If algorithm initialization fails
* @return bool True if signature is valid
*/
public function validateWithJWKSet(JWKSet $set)
{
if (!count($set)) {
throw new \RuntimeException("No keys.");
}
$factory = new SignatureAlgorithmFactory($this->header());
$algo = $factory->algoByKeys($set);
return $this->validate($algo);
}