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<?php |
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/** |
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* This file provides compatibility functions and code for older versions of |
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* PHP, such as the sha1() function, missing extensions, or 64-bit vs 32-bit |
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* systems. It is only included for those older versions or when the respective |
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* extension or function cannot be found. |
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* |
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* Simple Machines Forum (SMF) |
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* |
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* @package SMF |
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* @author Simple Machines http://www.simplemachines.org |
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* @copyright 2019 Simple Machines and individual contributors |
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* @license http://www.simplemachines.org/about/smf/license.php BSD |
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* |
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* @version 2.1 RC2 |
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*/ |
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if (!defined('SMF')) |
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die('No direct access...'); |
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/** |
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* Define the old SMF sha1 function. Uses mhash if available |
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* |
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* @param string $str The string |
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* @return string The sha1 hashed version of $str |
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*/ |
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function sha1_smf($str) |
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{ |
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// If we have mhash loaded in, use it instead! |
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if (function_exists('mhash') && defined('MHASH_SHA1')) |
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return bin2hex(mhash(MHASH_SHA1, $str)); |
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$nblk = (strlen($str) + 8 >> 6) + 1; |
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$blks = array_pad(array(), $nblk * 16, 0); |
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for ($i = 0; $i < strlen($str); $i++) |
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$blks[$i >> 2] |= ord($str{$i}) << (24 - ($i % 4) * 8); |
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$blks[$i >> 2] |= 0x80 << (24 - ($i % 4) * 8); |
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return sha1_core($blks, strlen($str) * 8); |
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} |
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/** |
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* This is the core SHA-1 calculation routine, used by sha1(). |
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* |
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* @param string $x |
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* @param int $len |
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* @return string |
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*/ |
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function sha1_core($x, $len) |
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{ |
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@$x[$len >> 5] |= 0x80 << (24 - $len % 32); |
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$x[(($len + 64 >> 9) << 4) + 15] = $len; |
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$w = array(); |
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$a = 1732584193; |
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$b = -271733879; |
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$c = -1732584194; |
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$d = 271733878; |
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$e = -1009589776; |
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for ($i = 0, $n = count($x); $i < $n; $i += 16) |
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{ |
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$olda = $a; |
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$oldb = $b; |
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$oldc = $c; |
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$oldd = $d; |
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$olde = $e; |
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for ($j = 0; $j < 80; $j++) |
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{ |
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if ($j < 16) |
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$w[$j] = isset($x[$i + $j]) ? $x[$i + $j] : 0; |
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else |
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$w[$j] = sha1_rol($w[$j - 3] ^ $w[$j - 8] ^ $w[$j - 14] ^ $w[$j - 16], 1); |
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$t = sha1_rol($a, 5) + sha1_ft($j, $b, $c, $d) + $e + $w[$j] + sha1_kt($j); |
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$e = $d; |
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$d = $c; |
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$c = sha1_rol($b, 30); |
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$b = $a; |
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$a = $t; |
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} |
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$a += $olda; |
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$b += $oldb; |
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$c += $oldc; |
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$d += $oldd; |
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$e += $olde; |
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} |
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return sprintf('%08x%08x%08x%08x%08x', $a, $b, $c, $d, $e); |
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} |
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/** |
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* Helper function for the core SHA-1 calculation |
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* |
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* @param int $t |
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* @param int $b |
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* @param int $c |
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* @param int $d |
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* @return int |
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*/ |
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function sha1_ft($t, $b, $c, $d) |
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{ |
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if ($t < 20) |
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return ($b & $c) | ((~$b) & $d); |
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if ($t < 40) |
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return $b ^ $c ^ $d; |
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if ($t < 60) |
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return ($b & $c) | ($b & $d) | ($c & $d); |
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return $b ^ $c ^ $d; |
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} |
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/** |
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* Helper function for the core SHA-1 calculation |
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* |
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* @param int $t |
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* @return int 1518500249, 1859775393, -1894007588 or -899497514 depending on the value of $t |
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*/ |
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function sha1_kt($t) |
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{ |
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return $t < 20 ? 1518500249 : ($t < 40 ? 1859775393 : ($t < 60 ? -1894007588 : -899497514)); |
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} |
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/** |
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* Helper function for the core SHA-1 calculation |
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* |
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* @param int $num |
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* @param int $cnt |
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* @return int |
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*/ |
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function sha1_rol($num, $cnt) |
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{ |
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// Unfortunately, PHP uses unsigned 32-bit longs only. So we have to kludge it a bit. |
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if ($num & 0x80000000) |
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$a = ($num >> 1 & 0x7fffffff) >> (31 - $cnt); |
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else |
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$a = $num >> (32 - $cnt); |
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return ($num << $cnt) | $a; |
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} |
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/** |
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* Available since: (PHP 5) |
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* If the optional raw_output is set to TRUE, then the sha1 digest is instead returned in raw binary format with a length of 20, |
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* otherwise the returned value is a 40-character hexadecimal number. |
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* |
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* @param string $text The text to hash |
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* @return string The sha1 hash of $text |
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*/ |
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function sha1_raw($text) |
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{ |
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return sha1($text, true); |
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} |
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/** |
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* Compatibility function. |
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* crc32 doesn't work as expected on 64-bit functions - make our own. |
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* https://php.net/crc32#79567 |
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* |
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* @param string $number |
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* @return string The crc32 polynomial of $number |
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*/ |
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if (!function_exists('smf_crc32')) |
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{ |
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function smf_crc32($number) |
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{ |
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$crc = crc32($number); |
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if ($crc & 0x80000000) |
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{ |
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$crc ^= 0xffffffff; |
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$crc += 1; |
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$crc = -$crc; |
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} |
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return $crc; |
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} |
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} |
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?> |
Antes /
kittenground
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