mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/OATHAuth
synced 2024-12-18 19:10:38 +00:00
106 lines
2.6 KiB
PHP
106 lines
2.6 KiB
PHP
<?php
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/**
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* PHP Google two-factor authentication module.
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*
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* See http://www.idontplaydarts.com/2011/07/google-totp-two-factor-authentication-for-php/
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* for more details
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*
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* @author Phil
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**/
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class Base32 {
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private static $lut = array(
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"A" => 0, "B" => 1,
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"C" => 2, "D" => 3,
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"E" => 4, "F" => 5,
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"G" => 6, "H" => 7,
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"I" => 8, "J" => 9,
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"K" => 10, "L" => 11,
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"M" => 12, "N" => 13,
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"O" => 14, "P" => 15,
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"Q" => 16, "R" => 17,
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"S" => 18, "T" => 19,
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"U" => 20, "V" => 21,
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"W" => 22, "X" => 23,
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"Y" => 24, "Z" => 25,
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"2" => 26, "3" => 27,
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"4" => 28, "5" => 29,
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"6" => 30, "7" => 31
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);
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/**
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* Decodes a base32 string into a binary string according to RFC 4648.
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**/
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public static function decode($b32) {
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$b32 = strtoupper($b32);
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if (!preg_match('/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ234567]+$/', $b32, $match))
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throw new Exception('Invalid characters in the base32 string.');
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$l = strlen($b32);
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$n = 0;
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$j = 0;
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$binary = "";
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for ($i = 0; $i < $l; $i++) {
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// Move buffer left by 5 to make room
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$n = $n << 5;
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// Add value into buffer
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$n = $n + self::$lut[$b32[$i]];
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// Keep track of number of bits in buffer
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$j = $j + 5;
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if ($j >= 8) {
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$j = $j - 8;
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$binary .= chr(($n & (0xFF << $j)) >> $j);
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}
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}
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return $binary;
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}
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/**
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* Encodes a binary string into a base32 string according to RFC 4648 (no padding).
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**/
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public static function encode($string) {
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if (empty($string))
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throw new Exception('Empty string.');
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$b32 = "";
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$binary = "";
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$bytes = str_split($string);
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$length = count( $bytes );
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for ($i = 0; $i < $length; $i++) {
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$bits = base_convert(ord($bytes[$i]), 10, 2);
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$binary .= str_pad($bits, 8, '0', STR_PAD_LEFT);
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}
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$map = array_keys(self::$lut);
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$fivebits = str_split($binary, 5);
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$length = count( $fivebits );
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for ($i = 0; $i < $length; $i++) {
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$dec = base_convert(str_pad($fivebits[$i], 5, '0'), 2, 10);
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$b32 .= $map[$dec];
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}
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return $b32;
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}
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}
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