86 lines
2.6 KiB
PHP
Executable File
86 lines
2.6 KiB
PHP
Executable File
<?php
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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include_once("FixedByteNotation.php");
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class GoogleAuthenticator {
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static $PASS_CODE_LENGTH = 6;
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static $PIN_MODULO;
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static $SECRET_LENGTH = 10;
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public function __construct() {
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self::$PIN_MODULO = pow(10, self::$PASS_CODE_LENGTH);
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}
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public function checkCode($secret,$code) {
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$time = floor(time() / 30);
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for ( $i = -1; $i <= 1; $i++) {
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if ($this->getCode($secret,$time + $i) == $code) {
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return true;
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}
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}
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return false;
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}
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public function getCode($secret,$time = null) {
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if (!$time) {
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$time = floor(time() / 30);
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}
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$base32 = new FixedBitNotation(5, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567', TRUE, TRUE);
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$secret = $base32->decode($secret);
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$time = pack("N", $time);
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$time = str_pad($time,8, chr(0), STR_PAD_LEFT);
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$hash = hash_hmac('sha1',$time,$secret,true);
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$offset = ord(substr($hash,-1));
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$offset = $offset & 0xF;
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$truncatedHash = self::hashToInt($hash, $offset) & 0x7FFFFFFF;
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$pinValue = str_pad($truncatedHash % self::$PIN_MODULO,6,"0",STR_PAD_LEFT);;
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return $pinValue;
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}
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protected function hashToInt($bytes, $start) {
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$input = substr($bytes, $start, strlen($bytes) - $start);
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$val2 = unpack("N",substr($input,0,4));
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return $val2[1];
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}
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public function getUrl($user, $hostname, $secret) {
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$url = sprintf("otpauth://totp/%s@%s?secret=%s", $user, $hostname, $secret);
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$encoder = "https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=" . urlencode($url);
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return $encoder;
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}
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public function generateSecret() {
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$secret = "";
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for($i = 1; $i<= self::$SECRET_LENGTH;$i++) {
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$c = rand(0,255);
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$secret .= pack("c",$c);
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}
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$base32 = new FixedBitNotation(5, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567', TRUE, TRUE);
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return $base32->encode($secret);
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}
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}
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