e7feca0e53
ZeroBin now generates a much stronger salt. This fixes issue #68 (mentioned in section 2.1 of https://defuse.ca/audits/zerobin.htm) (cherry picked from commit a24212afda90ca3e4b4ff5ce30d2012709b58a28) Conflicts: lib/serversalt.php lib/vizhash16x16.php
78 lines
1.9 KiB
PHP
78 lines
1.9 KiB
PHP
<?php
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/**
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* ZeroBin
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*
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* a zero-knowledge paste bin
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*
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* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.19
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*/
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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 ZeroBin 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 ZeroBin servers)
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* - to generate unique deletion token (which are not re-usable across ZeroBin servers)
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*/
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class serversalt extends persistence
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{
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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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{
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$randomSalt = bin2hex(mcrypt_create_iv(256, MCRYPT_DEV_URANDOM));
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}
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else // fallback to mt_rand()
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{
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for($i = 0; $i < 16; ++$i) {
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$randomSalt .= base_convert(mt_rand(), 10, 16);
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}
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}
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self::$_salt = $randomSalt;
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return self::$_salt;
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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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* @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::$_salt)) return self::$_salt;
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$file = 'salt.php';
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if (!self::_exists($file)) {
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self::_store(
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$file,
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'<?php /* |'. self::generate() . '| */ ?>'
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);
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}
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$items = explode('|', file_get_contents(self::getPath($file)));
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self::$_salt = $items[1];
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return $items[1];
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}
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}
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