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