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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
*
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Security\IdentityProof;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IUser;
use OCP\IUserManager;
class Signer {
/** @var Manager */
private $keyManager;
/** @var ITimeFactory */
private $timeFactory;
/** @var IUserManager */
private $userManager;
/**
* @param Manager $keyManager
* @param ITimeFactory $timeFactory
* @param IUserManager $userManager
*/
public function __construct(Manager $keyManager,
ITimeFactory $timeFactory,
IUserManager $userManager) {
$this->keyManager = $keyManager;
$this->timeFactory = $timeFactory;
$this->userManager = $userManager;
}
/**
* Returns a signed blob for $data
*
* @param string $type
* @param array $data
* @param IUser $user
* @return array ['message', 'signature']
*/
public function sign(string $type, array $data, IUser $user): array {
$privateKey = $this->keyManager->getKey($user)->getPrivate();
$data = [
'data' => $data,
'type' => $type,
'signer' => $user->getCloudId(),
'timestamp' => $this->timeFactory->getTime(),
];
openssl_sign(json_encode($data), $signature, $privateKey, OPENSSL_ALGO_SHA512);
return [
'message' => $data,
'signature' => base64_encode($signature),
];
}
/**
* Whether the data is signed properly
*
* @param array $data
* @return bool
*/
public function verify(array $data): bool {
if (isset($data['message'])
&& isset($data['signature'])
&& isset($data['message']['signer'])
) {
$location = strrpos($data['message']['signer'], '@');
$userId = substr($data['message']['signer'], 0, $location);
$user = $this->userManager->get($userId);
if ($user !== null) {
$key = $this->keyManager->getKey($user);
return (bool)openssl_verify(
json_encode($data['message']),
base64_decode($data['signature']),
$key->getPublic(),
OPENSSL_ALGO_SHA512
);
}
}
return false;
}
}
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