/**
* Initialize key management algorithm from a JWK and a header.
*
* @param JWK $jwk
* @param Header $header
* @return KeyManagementAlgorithm
*/
public static function fromJWK(JWK $jwk, Header $header)
{
$factory = new KeyAlgorithmFactory($header);
return $factory->algoByKey($jwk);
}
/**
* Decrypt content 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 string Plaintext payload
*/
public function decryptWithJWKSet(JWKSet $set)
{
if (!count($set)) {
throw new \RuntimeException("No keys.");
}
$header = $this->header();
$factory = new KeyAlgorithmFactory($header);
$key_algo = $factory->algoByKeys($set);
$enc_algo = EncryptionAlgorithmFactory::algoByHeader($header);
return $this->decrypt($key_algo, $enc_algo);
}