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<?php
/**
*
* (c) Copyright Ascensio System Limited 2010-2017
*
* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
*
* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
*
* You can contact Ascensio System SIA by email at sales@onlyoffice.com
*
* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
*
* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
* relevant author attributions when distributing the software. If the display of the logo in its graphic
* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
* in every copy of the program you distribute.
* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
*
*/
namespace OCA\Onlyoffice;
use OCA\Onlyoffice\AppConfig;
/**
* Hash generator
*
* @package OCA\Onlyoffice
*/
class Crypt {
/**
* The secret key from the application configuration
*
* @var string
*/
private $skey;
/**
* @param OCA\Onlyoffice\AppConfig $config - application configutarion
*/
public function __construct(AppConfig $appConfig) {
$this->skey = $appConfig->GetSKey();
}
/**
* Generate base64 hash for the object
*
* @param array $object - object to signature hash
*
* @return string
*/
public function GetHash($object) {
$primaryKey = json_encode($object);
$hash = $this->SignatureCreate($primaryKey);
return $hash;
}
/**
* Create an object from the base64 hash
*
* @param string $hash - base64 hash
*
* @return array
*/
public function ReadHash($hash) {
$result = NULL;
if ($hash === NULL) {
return $result;
}
try {
$payload = base64_decode($hash);
$payloadParts = explode("?", $payload);
$encode = base64_encode( hash( "sha256", ($payloadParts[1] . $this->skey), true ) );
if ($payloadParts[0] === $encode) {
$result = json_decode($payloadParts[1]);
}
} catch (\Exception $e) {
}
return $result;
}
/**
* Generate base64 hash for the object
*
* @param string $primary_key - string to the signature hash
*
* @return string
*/
private function SignatureCreate($primary_key) {
$payload = base64_encode( hash( "sha256", ($primary_key . $this->skey), true ) ) . "?" . $primary_key;
$base64Str = base64_encode($payload);
return $base64Str;
}
}
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