| 1,75 → 1,75 |
|---|
| <?php |
| // +----------------------------------------------------------------------+ |
| // | PHP Version 4 | |
| // +----------------------------------------------------------------------+ |
| // | Copyright (c) 1997-2004 The PHP Group | |
| // +----------------------------------------------------------------------+ |
| // | This source file is subject to version 3.0 of the PHP license, | |
| // | that is bundled with this package in the file LICENSE, and is | |
| // | available at through the world-wide-web at | |
| // | http://www.php.net/license/3_0.txt. | |
| // | If you did not receive a copy of the PHP license and are unable to | |
| // | obtain it through the world-wide-web, please send a note to | |
| // | license@php.net so we can mail you a copy immediately. | |
| // +----------------------------------------------------------------------+ |
| // | Authors: Aidan Lister <aidan@php.net> | |
| // +----------------------------------------------------------------------+ |
| // |
| // $Id: bcpowmod.php,v 1.2 2005/11/22 20:24:45 aidan Exp $ |
| |
| |
| /** |
| * Replace bcpowmod() |
| * |
| * @category PHP |
| * @package PHP_Compat |
| * @link http://php.net/function.bcpowmod |
| * @author Sara Golemon <pollita@php.net> |
| * @version $Revision: 1.2 $ |
| * @since PHP 5.0.0 |
| * @require PHP 4.0.0 (user_error) |
| */ |
| if (!function_exists('bcpowmod')) { |
| function bcpowmod($x, $y, $modulus, $scale) |
| { |
| // Sanity check |
| if (!is_scalar($x)) { |
| user_error('bcpowmod() expects parameter 1 to be string, ' . |
| gettype($x) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| if (!is_scalar($y)) { |
| user_error('bcpowmod() expects parameter 2 to be string, ' . |
| gettype($y) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| if (!is_scalar($modulus)) { |
| user_error('bcpowmod() expects parameter 3 to be string, ' . |
| gettype($modulus) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| if (!is_scalar($scale)) { |
| user_error('bcpowmod() expects parameter 4 to be integer, ' . |
| gettype($scale) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| $t = '1'; |
| while (bccomp($y, '0')) { |
| if (bccomp(bcmod($y, '2'), '0')) { |
| $t = bcmod(bcmul($t, $x), $modulus); |
| $y = bcsub($y, '1'); |
| } |
| |
| $x = bcmod(bcmul($x, $x), $modulus); |
| $y = bcdiv($y, '2'); |
| } |
| |
| return $t; |
| } |
| } |
| |
| <?php |
| // +----------------------------------------------------------------------+ |
| // | PHP Version 4 | |
| // +----------------------------------------------------------------------+ |
| // | Copyright (c) 1997-2004 The PHP Group | |
| // +----------------------------------------------------------------------+ |
| // | This source file is subject to version 3.0 of the PHP license, | |
| // | that is bundled with this package in the file LICENSE, and is | |
| // | available at through the world-wide-web at | |
| // | http://www.php.net/license/3_0.txt. | |
| // | If you did not receive a copy of the PHP license and are unable to | |
| // | obtain it through the world-wide-web, please send a note to | |
| // | license@php.net so we can mail you a copy immediately. | |
| // +----------------------------------------------------------------------+ |
| // | Authors: Aidan Lister <aidan@php.net> | |
| // +----------------------------------------------------------------------+ |
| // |
| // $Id: bcpowmod.php,v 1.2 2005/11/22 20:24:45 aidan Exp $ |
| |
| |
| /** |
| * Replace bcpowmod() |
| * |
| * @category PHP |
| * @package PHP_Compat |
| * @link http://php.net/function.bcpowmod |
| * @author Sara Golemon <pollita@php.net> |
| * @version $Revision: 1.2 $ |
| * @since PHP 5.0.0 |
| * @require PHP 4.0.0 (user_error) |
| */ |
| if (!function_exists('bcpowmod')) { |
| function bcpowmod($x, $y, $modulus, $scale) |
| { |
| // Sanity check |
| if (!is_scalar($x)) { |
| user_error('bcpowmod() expects parameter 1 to be string, ' . |
| gettype($x) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| if (!is_scalar($y)) { |
| user_error('bcpowmod() expects parameter 2 to be string, ' . |
| gettype($y) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| if (!is_scalar($modulus)) { |
| user_error('bcpowmod() expects parameter 3 to be string, ' . |
| gettype($modulus) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| if (!is_scalar($scale)) { |
| user_error('bcpowmod() expects parameter 4 to be integer, ' . |
| gettype($scale) . ' given', E_USER_WARNING); |
| return false; |
| } |
| |
| $t = '1'; |
| while (bccomp($y, '0')) { |
| if (bccomp(bcmod($y, '2'), '0')) { |
| $t = bcmod(bcmul($t, $x), $modulus); |
| $y = bcsub($y, '1'); |
| } |
| |
| $x = bcmod(bcmul($x, $x), $modulus); |
| $y = bcdiv($y, '2'); |
| } |
| |
| return $t; |
| } |
| } |
| |
| ?> |