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76bfab1303
* Part 1 Removing closing tags when no HTML or other output comes after the last PHP codeblock. * Further removals * nothing --------- Co-authored-by: slawkens <slawkens@gmail.com>
285 lines
7.8 KiB
PHP
285 lines
7.8 KiB
PHP
<?php
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/** https://github.com/Voronenko/PHPOTP/blob/08cda9cb9c30b7242cf0b3a9100a6244a2874927/code/base32static.php
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* Encode in Base32 based on RFC 4648.
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* Requires 20% more space than base64
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* Great for case-insensitive filesystems like Windows and URL's (except for = char which can be excluded using the pad option for urls)
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*
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* @package default
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* @author Bryan Ruiz
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**/
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class Base32Static {
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private static $map = array(
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 7
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23
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'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31
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'=' // padding character
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);
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private static $flippedMap = array(
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'A'=>'0', 'B'=>'1', 'C'=>'2', 'D'=>'3', 'E'=>'4', 'F'=>'5', 'G'=>'6', 'H'=>'7',
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'I'=>'8', 'J'=>'9', 'K'=>'10', 'L'=>'11', 'M'=>'12', 'N'=>'13', 'O'=>'14', 'P'=>'15',
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'Q'=>'16', 'R'=>'17', 'S'=>'18', 'T'=>'19', 'U'=>'20', 'V'=>'21', 'W'=>'22', 'X'=>'23',
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'Y'=>'24', 'Z'=>'25', '2'=>'26', '3'=>'27', '4'=>'28', '5'=>'29', '6'=>'30', '7'=>'31'
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);
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/**
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* Use padding false when encoding for urls
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*
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* @return base32 encoded string
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* @author Bryan Ruiz
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**/
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public static function encode($input, $padding = true) {
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if(empty($input)) return "";
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$input = str_split($input);
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$binaryString = "";
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for($i = 0; $i < count($input); $i++) {
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$binaryString .= str_pad(base_convert(ord($input[$i]), 10, 2), 8, '0', STR_PAD_LEFT);
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}
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$fiveBitBinaryArray = str_split($binaryString, 5);
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$base32 = "";
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$i=0;
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while($i < count($fiveBitBinaryArray)) {
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$base32 .= self::$map[base_convert(str_pad($fiveBitBinaryArray[$i], 5,'0'), 2, 10)];
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$i++;
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}
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if($padding && ($x = strlen($binaryString) % 40) != 0) {
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if($x == 8) $base32 .= str_repeat(self::$map[32], 6);
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else if($x == 16) $base32 .= str_repeat(self::$map[32], 4);
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else if($x == 24) $base32 .= str_repeat(self::$map[32], 3);
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else if($x == 32) $base32 .= self::$map[32];
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}
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return $base32;
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}
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public static function decode($input) {
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if(empty($input)) return;
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$paddingCharCount = substr_count($input, self::$map[32]);
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$allowedValues = array(6,4,3,1,0);
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if(!in_array($paddingCharCount, $allowedValues)) return false;
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for($i=0; $i<4; $i++){
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if($paddingCharCount == $allowedValues[$i] &&
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substr($input, -($allowedValues[$i])) != str_repeat(self::$map[32], $allowedValues[$i])) return false;
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}
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$input = str_replace('=','', $input);
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$input = str_split($input);
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$binaryString = "";
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for($i=0; $i < count($input); $i = $i+8) {
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$x = "";
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if(!in_array($input[$i], self::$map)) return false;
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for($j=0; $j < 8; $j++) {
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$x .= str_pad(base_convert(@self::$flippedMap[@$input[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);
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}
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$eightBits = str_split($x, 8);
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for($z = 0; $z < count($eightBits); $z++) {
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$binaryString .= ( ($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48 ) ? $y:"";
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}
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}
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return $binaryString;
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}
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}
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// http://www.faqs.org/rfcs/rfc6238.html
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// https://github.com/Voronenko/PHPOTP/blob/08cda9cb9c30b7242cf0b3a9100a6244a2874927/code/rfc6238.php
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// Local changes: http -> https, consistent indentation, 200x200 -> 300x300 QR image size, PHP end tag
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class TokenAuth6238 {
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/**
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* verify
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*
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* @param string $secretkey Secret clue (base 32).
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* @return bool True if success, false if failure
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*/
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public static function verify($secretkey, $code, $rangein30s = 3) {
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$key = base32static::decode($secretkey);
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$unixtimestamp = time()/30;
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for($i=-($rangein30s); $i<=$rangein30s; $i++) {
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$checktime = (int)($unixtimestamp+$i);
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$thiskey = self::oath_hotp($key, $checktime);
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if ((int)$code == self::oath_truncate($thiskey,6)) {
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return true;
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}
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}
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return false;
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}
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public static function getTokenCode($secretkey,$rangein30s = 3) {
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$result = "";
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$key = base32static::decode($secretkey);
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$unixtimestamp = time()/30;
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for($i=-($rangein30s); $i<=$rangein30s; $i++) {
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$checktime = (int)($unixtimestamp+$i);
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$thiskey = self::oath_hotp($key, $checktime);
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$result = $result." # ".self::oath_truncate($thiskey,6);
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}
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return $result;
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}
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public static function getTokenCodeDebug($secretkey,$rangein30s = 3) {
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$result = "";
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print "<br/>SecretKey: $secretkey <br/>";
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$key = base32static::decode($secretkey);
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print "Key(base 32 decode): $key <br/>";
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$unixtimestamp = time()/30;
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print "UnixTimeStamp (time()/30): $unixtimestamp <br/>";
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for($i=-($rangein30s); $i<=$rangein30s; $i++) {
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$checktime = (int)($unixtimestamp+$i);
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print "Calculating oath_hotp from (int)(unixtimestamp +- 30sec offset): $checktime basing on secret key<br/>";
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$thiskey = self::oath_hotp($key, $checktime, true);
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print "======================================================<br/>";
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print "CheckTime: $checktime oath_hotp:".$thiskey."<br/>";
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$result = $result." # ".self::oath_truncate($thiskey,6,true);
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}
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return $result;
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}
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public static function getBarCodeUrl($username, $domain, $secretkey, $issuer) {
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$url = "https://chart.apis.google.com/chart";
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$url = $url."?chs=300x300&chld=M|0&cht=qr&chl=otpauth://totp/";
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$url = $url.$username . "@" . $domain . "%3Fsecret%3D" . $secretkey . '%26issuer%3D' . rawurlencode($issuer);
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return $url;
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}
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public static function generateRandomClue($length = 16) {
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$b32 = "234567QWERTYUIOPASDFGHJKLZXCVBNM";
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$s = "";
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for ($i = 0; $i < $length; $i++)
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$s .= $b32[rand(0,31)];
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return $s;
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}
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private static function hotp_tobytestream($key) {
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$result = array();
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$last = strlen($key);
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for ($i = 0; $i < $last; $i = $i + 2) {
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$x = $key[$i] + $key[$i + 1];
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$x = strtoupper($x);
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$x = hexdec($x);
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$result = $result.chr($x);
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}
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return $result;
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}
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private static function oath_hotp ($key, $counter, $debug=false) {
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$result = "";
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$orgcounter = $counter;
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$cur_counter = array(0,0,0,0,0,0,0,0);
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if ($debug) {
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print "Packing counter $counter (".dechex($counter).")into binary string - pay attention to hex representation of key and binary representation<br/>";
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}
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for($i=7;$i>=0;$i--) { // C for unsigned char, * for repeating to the end of the input data
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$cur_counter[$i] = pack ('C*', $counter);
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if ($debug) {
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print $cur_counter[$i]."(".dechex(ord($cur_counter[$i])).")"." from $counter <br/>";
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}
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$counter = $counter >> 8;
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}
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if ($debug) {
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foreach ($cur_counter as $char) {
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print ord($char) . " ";
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}
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print "<br/>";
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}
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$binary = implode($cur_counter);
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// Pad to 8 characters
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str_pad($binary, 8, chr(0), STR_PAD_LEFT);
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if ($debug) {
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print "Prior to HMAC calculation pad with zero on the left until 8 characters.<br/>";
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print "Calculate sha1 HMAC(Hash-based Message Authentication Code http://en.wikipedia.org/wiki/HMAC).<br/>";
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print "hash_hmac ('sha1', $binary, $key)<br/>";
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}
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$result = hash_hmac ('sha1', $binary, $key);
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if ($debug) {
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print "Result: $result <br/>";
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}
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return $result;
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}
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private static function oath_truncate($hash, $length = 6, $debug=false) {
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$result="";
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// Convert to dec
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if($debug) {
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print "converting hex hash into characters<br/>";
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}
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$hashcharacters = str_split($hash,2);
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if($debug) {
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print_r($hashcharacters);
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print "<br/>and convert to decimals:<br/>";
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}
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for ($j=0; $j<count($hashcharacters); $j++) {
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$hmac_result[]=hexdec($hashcharacters[$j]);
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}
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if($debug) {
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print_r($hmac_result);
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}
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// http://php.net/manual/ru/function.hash-hmac.php
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// adopted from brent at thebrent dot net 21-May-2009 08:17 comment
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$offset = $hmac_result[19] & 0xf;
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if($debug) {
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print "Calculating offset as 19th element of hmac:".$hmac_result[19]."<br/>";
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print "offset:".$offset;
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}
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$result = (
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(($hmac_result[$offset+0] & 0x7f) << 24 ) |
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(($hmac_result[$offset+1] & 0xff) << 16 ) |
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(($hmac_result[$offset+2] & 0xff) << 8 ) |
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($hmac_result[$offset+3] & 0xff)
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) % pow(10,$length);
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return $result;
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}
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}
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