87 lines
1.9 KiB
PHP
87 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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* filter
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*
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* Provides data filtering functions.
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*/
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class filter
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{
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/**
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* strips slashes deeply
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*
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* @access public
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* @static
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* @param mixed $value
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* @return mixed
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*/
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public static function stripslashes_deep($value)
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{
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return is_array($value) ?
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array_map('filter::stripslashes_deep', $value) :
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stripslashes($value);
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}
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/**
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* format a given number of bytes
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*
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* @access public
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* @static
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* @param int $size
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* @return string
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*/
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public static function size_humanreadable($size)
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{
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$iec = array('B', 'kiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB');
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$i = 0;
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while ( ( $size / 1024 ) >= 1 ) {
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$size = $size / 1024;
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$i++;
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}
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return number_format($size, ($i ? 2 : 0), '.', ' ') . ' ' . $iec[$i];
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}
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/**
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* validate paste ID
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*
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* @access public
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* @static
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* @param string $dataid
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* @return bool
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*/
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public static function is_valid_paste_id($dataid)
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{
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return (bool) preg_match('#\A[a-f\d]{16}\z#', $dataid);
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}
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/**
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* fixed time string comparison operation to prevent timing attacks
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* https://crackstation.net/hashing-security.htm?=rd#slowequals
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*
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* @access public
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* @static
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* @param string $a
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* @param string $b
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* @return bool
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*/
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public static function slow_equals($a, $b)
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{
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$diff = strlen($a) ^ strlen($b);
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for($i = 0; $i < strlen($a) && $i < strlen($b); $i++)
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{
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$diff |= ord($a[$i]) ^ ord($b[$i]);
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}
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return $diff === 0;
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}
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}
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