/**
* {@inheritdoc}
*/
public function getCEK(JWKInterface $key, array $header)
{
if ('dir' !== $key->getKeyType()) {
throw new \InvalidArgumentException('The key is not valid');
}
return Base64Url::decode($key->getValue('dir'));
}
/**
* @param JWKInterface $key
*/
protected function checkKey(JWKInterface $key)
{
if ('oct' !== $key->getKeyType() || null === $key->getValue('k')) {
throw new \InvalidArgumentException('The key is not valid');
}
}
/**
* @param JWKInterface $key
*
* @throws \Exception
*
* @return \Mdanter\Ecc\Primitives\GeneratorPoint
*/
private function getGenerator(JWKInterface $key)
{
$crv = $key->getValue('crv');
switch ($crv) {
case 'P-256':
return EccFactory::getNistCurves()->generator256();
case 'P-384':
return EccFactory::getNistCurves()->generator384();
case 'P-521':
return EccFactory::getNistCurves()->generator521();
default:
throw new \Exception("Curve {$crv} is not supported");
}
}
