%PDF-
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Mini Shell
Mini Shell
<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Security\IdentityProof;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IUser;
use OCP\IUserManager;
class Signer {
public function __construct(
private Manager $keyManager,
private ITimeFactory $timeFactory,
private IUserManager $userManager,
) {
}
/**
* Returns a signed blob for $data
*
* @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
*
*/
public function verify(array $data): bool {
if (isset($data['message']['signer'])
&& isset($data['signature'])
) {
$location = strrpos($data['message']['signer'], '@');
$userId = substr($data['message']['signer'], 0, $location);
$user = $this->userManager->get($userId);
if ($user !== null) {
$key = $this->keyManager->getKey($user);
return openssl_verify(
json_encode($data['message']),
base64_decode($data['signature']),
$key->getPublic(),
OPENSSL_ALGO_SHA512
) === 1;
}
}
return false;
}
}
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