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<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Jose\Component\Signature\Algorithm;
use Jose\Component\Core\JWK;
use Jose\Component\Core\Util\RSAKey;
use Jose\Component\Signature\Util\RSA as JoseRSA;
abstract class RSA implements SignatureAlgorithm
{
abstract protected function getAlgorithm(): string;
abstract protected function getSignatureMethod(): int;
public function allowedKeyTypes(): array
{
return ['RSA'];
}
public function verify(JWK $key, string $input, string $signature): bool
{
$this->checkKey($key);
$pub = RSAKey::createFromJWK($key->toPublic());
return JoseRSA::verify($pub, $input, $signature, $this->getAlgorithm(), $this->getSignatureMethod());
}
public function sign(JWK $key, string $input): string
{
$this->checkKey($key);
if (!$key->has('d')) {
throw new \InvalidArgumentException('The key is not a private key.');
}
$priv = RSAKey::createFromJWK($key);
return JoseRSA::sign($priv, $input, $this->getAlgorithm(), $this->getSignatureMethod());
}
private function checkKey(JWK $key)
{
if (!\in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
throw new \InvalidArgumentException('Wrong key type.');
}
foreach (['n', 'e'] as $k) {
if (!$key->has($k)) {
throw new \InvalidArgumentException(\sprintf('The key parameter "%s" is missing.', $k));
}
}
}
}
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