/**
* @param array $header
* @param \Jose\JWKInterface $key
*
* @return \Jose\Operation\SignatureInterface|null
*/
protected function getAlgorithm(array $header, JWKInterface $key)
{
if (!array_key_exists('alg', $header)) {
if (is_null($key->getAlgorithm())) {
throw new \InvalidArgumentException("No 'alg' parameter set in the header or the key.");
} else {
$alg = $key->getAlgorithm();
}
} else {
$alg = $header['alg'];
}
$algorithm = $this->getJWAManager()->getAlgorithm($alg);
if (!$algorithm instanceof SignatureInterface) {
throw new \RuntimeException("The algorithm '{$alg}' is not supported or does not implement SignatureInterface.");
}
return $algorithm;
}
/**
* @param array $complete_header The complete header
* @param \Jose\JWKInterface $key
*
* @return \Jose\Operation\SignatureInterface
*/
protected function getSignatureAlgorithm(array $complete_header, JWKInterface $key)
{
if (!array_key_exists('alg', $complete_header)) {
if (is_null($key->getAlgorithm())) {
throw new \InvalidArgumentException("No 'alg' parameter set in the header or the key.");
} else {
$alg = $key->getAlgorithm();
}
} else {
$alg = $complete_header['alg'];
}
if (!is_null($key->getAlgorithm()) && $key->getAlgorithm() !== $alg) {
throw new \InvalidArgumentException("The algorithm '{$alg}' is allowed with this key.");
}
$signature_algorithm = $this->getJWAManager()->getAlgorithm($alg);
if (!$signature_algorithm instanceof SignatureInterface) {
throw new \InvalidArgumentException("The algorithm '{$alg}' is not supported.");
}
return $signature_algorithm;
}