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<?php declare(strict_types=1); namespace Jose\Component\Signature\Algorithm; use InvalidArgumentException; use Jose\Component\Core\JWK; use Jose\Component\Core\Util\RSAKey; use RuntimeException; use function extension_loaded; use function in_array; abstract class RSAPKCS1 implements SignatureAlgorithm { public function __construct() { if (! extension_loaded('openssl')) { throw new RuntimeException('Please install the OpenSSL extension'); } } 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 openssl_verify($input, $signature, $pub->toPEM(), $this->getAlgorithm()) === 1; } 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); $result = openssl_sign($input, $signature, $priv->toPEM(), $this->getAlgorithm()); if ($result !== true) { throw new RuntimeException('Unable to sign'); } return $signature; } abstract protected function getAlgorithm(): string; private function checkKey(JWK $key): void { if (! in_array($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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