PrivateBin/lib/serversalt.php

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<?php
/**
* ZeroBin
*
* a zero-knowledge paste bin
*
* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
* @version 0.19
*/
/**
* serversalt
*
* This is a random string which is unique to each ZeroBin installation.
* It is automatically created if not present.
*
* Salt is used:
* - to generate unique VizHash in discussions (which are not reproductible across ZeroBin servers)
* - to generate unique deletion token (which are not re-usable across ZeroBin servers)
*/
class serversalt extends persistence
{
/**
* @access private
* @static
* @var string
*/
private static $_salt = '';
/**
* generate a large random hexadecimal salt
*
* @access public
* @static
* @return string
*/
public static function generate()
{
$randomSalt = '';
if (function_exists('mcrypt_create_iv'))
{
$randomSalt = bin2hex(mcrypt_create_iv(256, MCRYPT_DEV_URANDOM));
}
else // fallback to mt_rand()
{
for($i = 0; $i < 16; ++$i) {
$randomSalt .= base_convert(mt_rand(), 10, 16);
}
}
self::$_salt = $randomSalt;
return self::$_salt;
}
/**
* get server salt
*
* @access public
* @static
* @return string
*/
public static function get()
{
if (strlen(self::$_salt)) return self::$_salt;
$file = 'salt.php';
if (!self::_exists($file)) {
self::_store(
$file,
'<?php /* |'. self::generate() . '| */ ?>'
);
}
$items = explode('|', file_get_contents(self::getPath($file)));
self::$_salt = $items[1];
return $items[1];
}
}