107 lines
2.5 KiB
PHP
107 lines
2.5 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.22
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*/
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namespace PrivateBin\Persistence;
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use Exception;
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/**
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* ServerSalt
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*
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* This is a random string which is unique to each PrivateBin installation.
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* It is automatically created if not present.
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*
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* Salt is used:
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* - to generate unique VizHash in discussions (which are not reproductible across PrivateBin servers)
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* - to generate unique deletion token (which are not re-usable across PrivateBin servers)
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*/
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class ServerSalt extends AbstractPersistence
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{
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/**
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* generated salt
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*
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* @access private
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* @static
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* @var string
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*/
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private static $_salt = '';
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/**
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* generate a large random hexadecimal salt
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*
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* @access public
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* @static
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* @return string
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*/
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public static function generate()
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{
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$randomSalt = '';
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if (function_exists('mcrypt_create_iv')) {
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$randomSalt = bin2hex(mcrypt_create_iv(256, MCRYPT_DEV_URANDOM));
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} else {
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// fallback to mt_rand()
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for ($i = 0; $i < 256; ++$i) {
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$randomSalt .= base_convert(mt_rand(), 10, 16);
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}
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}
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return $randomSalt;
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}
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/**
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* get server salt
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*
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* @access public
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* @static
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* @throws Exception
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* @return string
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*/
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public static function get()
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{
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if (strlen(self::$_salt)) {
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return self::$_salt;
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}
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$file = 'salt.php';
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if (self::_exists($file)) {
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if (is_readable(self::getPath($file))) {
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$items = explode('|', file_get_contents(self::getPath($file)));
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}
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if (!isset($items) || !is_array($items) || count($items) != 3) {
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throw new Exception('unable to read file ' . self::getPath($file), 20);
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}
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self::$_salt = $items[1];
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} else {
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self::$_salt = self::generate();
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self::_store(
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$file,
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'<?php /* |' . self::$_salt . '| */ ?>'
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);
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}
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return self::$_salt;
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}
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/**
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* set the path
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*
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* @access public
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* @static
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* @param string $path
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* @return void
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*/
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public static function setPath($path)
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{
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self::$_salt = '';
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parent::setPath($path);
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}
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}
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