1 files changed, 105 insertions, 0 deletions
diff --git a/www/wiki/extensions/OATHAuth/includes/lib/base32.php b/www/wiki/extensions/OATHAuth/includes/lib/base32.php
new file mode 100644
index 00000000..d4ca1dff
--- /dev/null
+++ b/www/wiki/extensions/OATHAuth/includes/lib/base32.php
@@ -0,0 +1,105 @@
+<?php
+/**
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * PHP Google two-factor authentication module.
+ *
+ * See http://www.idontplaydarts.com/2011/07/google-totp-two-factor-authentication-for-php/
+ * for more details
+ *
+ * @author Phil
+ **/
+
+class Base32 {
+
+	private static $lut = array(
+		"A" => 0, "B" => 1,
+		"C" => 2, "D" => 3,
+		"E" => 4, "F" => 5,
+		"G" => 6, "H" => 7,
+		"I" => 8, "J" => 9,
+		"K" => 10, "L" => 11,
+		"M" => 12, "N" => 13,
+		"O" => 14, "P" => 15,
+		"Q" => 16, "R" => 17,
+		"S" => 18, "T" => 19,
+		"U" => 20, "V" => 21,
+		"W" => 22, "X" => 23,
+		"Y" => 24, "Z" => 25,
+		"2" => 26, "3" => 27,
+		"4" => 28, "5" => 29,
+		"6" => 30, "7" => 31
+	);
+
+	/**
+	 * Decodes a base32 string into a binary string according to RFC 4648.
+	 **/
+	public static function decode($b32) {
+
+		$b32 = strtoupper($b32);
+
+		if (!preg_match('/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ234567]+$/', $b32, $match))
+			throw new Exception('Invalid characters in the base32 string.');
+
+		$l      = strlen($b32);
+		$n      = 0;
+		$j      = 0;
+		$binary = "";
+
+		for ($i = 0; $i < $l; $i++) {
+			// Move buffer left by 5 to make room
+			$n = $n << 5;
+			// Add value into buffer
+			$n = $n + self::$lut[$b32[$i]];
+			// Keep track of number of bits in buffer
+			$j = $j + 5;
+
+			if ($j >= 8) {
+				$j = $j - 8;
+				$binary .= chr(($n & (0xFF << $j)) >> $j);
+			}
+		}
+
+		return $binary;
+	}
+
+	/**
+	 * Encodes a binary string into a base32 string according to RFC 4648 (no padding).
+	 **/
+	public static function encode($string) {
+
+		if (empty($string))
+			throw new Exception('Empty string.');
+
+		$b32 = "";
+		$binary = "";
+
+		$bytes = str_split($string);
+		$length = count( $bytes );
+		for ($i = 0; $i < $length; $i++) {
+			$bits = base_convert(ord($bytes[$i]), 10, 2);
+			$binary .= str_pad($bits, 8, '0', STR_PAD_LEFT);
+		}
+
+		$map = array_keys(self::$lut);
+		$fivebits = str_split($binary, 5);
+		$length = count( $fivebits );
+		for ($i = 0; $i < $length; $i++) {
+			$dec = base_convert(str_pad($fivebits[$i],  5, '0'), 2, 10);
+			$b32 .= $map[$dec];
+		}
+
+		return $b32;
+	}
+}