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+<?php
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+
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+/**
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+ * PHP Class for handling Google Authenticator 2-factor authentication
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+ *
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+ * @author Michael Kliewe
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+ * @copyright 2012 Michael Kliewe
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+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
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+ * @link http://www.phpgangsta.de/
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+ */
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+
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+namespace Earnp\GoogleAuthenticator\Librarys;
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+
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+class GoogleAuthenticator
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+{
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+ protected $_codeLength = 6;
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+
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+ /**
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+ * Create new secret.
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+ * 16 characters, randomly chosen from the allowed base32 characters.
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+ *
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+ * @param int $secretLength
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+ * @return string
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+ */
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+ public function createSecret($secretLength = 16)
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+ {
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+ $validChars = $this->_getBase32LookupTable();
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+ unset($validChars[32]);
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+
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+ $secret = '';
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+ for ($i = 0; $i < $secretLength; $i++) {
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+ $secret .= $validChars[array_rand($validChars)];
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+ }
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+ return $secret;
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+ }
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+
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+ /**
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+ * Calculate the code, with given secret and point in time
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+ *
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+ * @param string $secret
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+ * @param int|null $timeSlice
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+ * @return string
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+ */
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+ public function getCode($secret, $timeSlice = null)
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+ {
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+ if ($timeSlice === null) {
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+ date_default_timezone_set('PRC');
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+ $timeSlice = floor(time() / 30);
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+ }
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+
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+ $secretkey = $this->_base32Decode($secret);
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+
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+ // Pack time into binary string
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+ $time = chr(0).chr(0).chr(0).chr(0).pack('N*', $timeSlice);
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+ // Hash it with users secret key
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+ $hm = hash_hmac('SHA1', $time, $secretkey, true);
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+ // Use last nipple of result as index/offset
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+ $offset = ord(substr($hm, -1)) & 0x0F;
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+ // grab 4 bytes of the result
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+ $hashpart = substr($hm, $offset, 4);
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+
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+ // Unpak binary value
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+ $value = unpack('N', $hashpart);
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+ $value = $value[1];
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+ // Only 32 bits
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+ $value = $value & 0x7FFFFFFF;
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+
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+ $modulo = pow(10, $this->_codeLength);
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+ return str_pad($value % $modulo, $this->_codeLength, '0', STR_PAD_LEFT);
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+ }
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+
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+ /**
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+ * Get QR-Code URL for image, from google charts
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+ *
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+ * @param string $name
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+ * @param string $secret
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+ * @param string $title
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+ * @return string
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+ */
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+ public function getQRCodeGoogleUrl($name, $secret, $title = null) {
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+ $urlencoded = urlencode('otpauth://totp/'.$name.'?secret='.$secret.'');
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+ if(isset($title)) {
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+ $urlencoded .= urlencode('&issuer='.urlencode($title));
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+ }
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+ return $urlencoded;
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+ }
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+
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+ /**
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+ * Check if the code is correct. This will accept codes starting from $discrepancy*30sec ago to $discrepancy*30sec from now
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+ *
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+ * @param string $secret
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+ * @param string $code
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+ * @param int $discrepancy This is the allowed time drift in 30 second units (8 means 4 minutes before or after)
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+ * @param int|null $currentTimeSlice time slice if we want use other that time()
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+ * @return bool
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+ */
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+ public function verifyCode($secret, $code, $discrepancy = 1, $currentTimeSlice = null)
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+ {
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+ if ($currentTimeSlice === null) {
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+ $currentTimeSlice = floor(time() / 30);
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+ }
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+
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+ for ($i = -$discrepancy; $i <= $discrepancy; $i++) {
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+ $calculatedCode = $this->getCode($secret, $currentTimeSlice + $i);
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+ if ($calculatedCode == $code ) {
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+ return true;
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+ }
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+ }
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+
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+ return false;
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+ }
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+
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+ /**
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+ * Set the code length, should be >=6
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+ *
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+ * @param int $length
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+ * @return PHPGangsta_GoogleAuthenticator
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+ */
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+ public function setCodeLength($length)
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+ {
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+ $this->_codeLength = $length;
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+ return $this;
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+ }
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+
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+ /**
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+ * Helper class to decode base32
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+ *
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+ * @param $secret
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+ * @return bool|string
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+ */
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+ protected function _base32Decode($secret)
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+ {
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+ if (empty($secret)) return '';
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+
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+ $base32chars = $this->_getBase32LookupTable();
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+ $base32charsFlipped = array_flip($base32chars);
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+
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+ $paddingCharCount = substr_count($secret, $base32chars[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($secret, -($allowedValues[$i])) != str_repeat($base32chars[32], $allowedValues[$i])) return false;
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+ }
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+ $secret = str_replace('=','', $secret);
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+ $secret = str_split($secret);
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+ $binaryString = "";
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+ for ($i = 0; $i < count($secret); $i = $i+8) {
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+ $x = "";
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+ if (!in_array($secret[$i], $base32chars)) return false;
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+ for ($j = 0; $j < 8; $j++) {
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+ $x .= str_pad(base_convert(@$base32charsFlipped[@$secret[$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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+ /**
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+ * Helper class to encode base32
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+ *
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+ * @param string $secret
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+ * @param bool $padding
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+ * @return string
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+ */
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+ protected function _base32Encode($secret, $padding = true)
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+ {
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+ if (empty($secret)) return '';
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+
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+ $base32chars = $this->_getBase32LookupTable();
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+
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+ $secret = str_split($secret);
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+ $binaryString = "";
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+ for ($i = 0; $i < count($secret); $i++) {
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+ $binaryString .= str_pad(base_convert(ord($secret[$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 .= $base32chars[base_convert(str_pad($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) $base32 .= str_repeat($base32chars[32], 6);
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+ elseif ($x == 16) $base32 .= str_repeat($base32chars[32], 4);
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+ elseif ($x == 24) $base32 .= str_repeat($base32chars[32], 3);
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+ elseif ($x == 32) $base32 .= $base32chars[32];
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+ }
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+ return $base32;
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+ }
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+
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+ /**
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+ * Get array with all 32 characters for decoding from/encoding to base32
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+ *
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+ * @return array
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+ */
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+ protected function _getBase32LookupTable()
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+ {
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+ return 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 char
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+ );
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+ }
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+}
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