verifyCode code does not match a2f code

[monster-space]

i use this library but every time i verify code it does not match so i make some changes in library i might wrong some where but these changes gives me 100% changes `<?php

/**

• PHP Class for handling Google Authenticator 2-factor authentication.
• @author Michael Kliewe
• @copyright 2012 Michael Kliewe
• @license http://www.opensource.org/licenses/bsd-license.php BSD License

• @link http://www.phpgangsta.de/ */ class GoogleAuthenticator { protected $_codeLength = 6;

  /**

  • Create new secret.
  • 16 characters, randomly chosen from the allowed base32 characters.
  • @param int $secretLength

  • @return string */ public function createSecret($secretLength = 16) { $validChars = $this->_getBase32LookupTable(); // var_dump($validChars);die; // Valid secret lengths are 80 to 640 bits if ($secretLength < 16 || $secretLength > 128) { throw new Exception('Bad secret length'); } $secret = ''; $rnd = false; if (function_exists('random_bytes') && !empty(random_bytes($secretLength))) { $rnd = random_bytes($secretLength); } elseif (function_exists('mcrypt_create_iv') && empty(random_bytes($secretLength))) { $rnd = mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM); } elseif (function_exists('openssl_random_pseudo_bytes') && empty(mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM))) { $rnd = openssl_random_pseudo_bytes($secretLength, $cryptoStrong); if (!$cryptoStrong) { $rnd = false; } } if ($rnd !== false) { for ($i = 0; $i < $secretLength; ++$i) { $secret .= $validChars[ord($rnd[$i]) & 31]; } } else { throw new Exception('No source of secure random'); }

    return $secret; }

  /**

  • Calculate the code, with given secret and point in time.
  • @param string $secret
  • @param int|null $timeSlice

  • @return string */ public function getCode($secret, $timeSlice = null) { if ($timeSlice === null) { $timeSlice = floor(time() / 30); }

    $secretkey = $this->_base32Decode($secret);

    // Pack time into binary string $time = chr(0).chr(0).chr(0).chr(0).pack('N*', $timeSlice); // Hash it with users secret key $hm = hash_hmac('SHA1', $time, $secretkey, true); // Use last nipple of result as index/offset $offset = ord(substr($hm, -1)) & 0x0F; // grab 4 bytes of the result $hashpart = substr($hm, $offset, 4);

    // Unpak binary value $value = unpack('N', $hashpart); $value = $value[1]; // Only 32 bits $value = $value & 0x7FFFFFFF;

    $modulo = pow(10, $this->_codeLength);

    return str_pad($value % $modulo, $this->_codeLength, '0', STR_PAD_LEFT); }

  /**

  • Get QR-Code URL for image, from google charts.
  • @param string $name
  • @param string $secret
  • @param string $title
  • @param array $params

  • @return string */ public function getQRCodeGoogleUrl($name, $secret, $title = null, $params = array()) { $width = !empty($params['width']) && (int) $params['width'] > 0 ? (int) $params['width'] : 175; $height = !empty($params['height']) && (int) $params['height'] > 0 ? (int) $params['height'] : 175; $level = !empty($params['level']) && array_search($params['level'], array('L', 'M', 'Q', 'H')) !== false ? $params['level'] : 'H';

    $urlencoded = urlencode('otpauth://totp/'.$name.'?secret='.$secret.''); if (isset($title)) { $urlencoded .= urlencode('&issuer='.urlencode($title)); }

    return 'https://chart.googleapis.com/chart?chs='.$width.'x'.$height.'&chld='.$level.'|0&cht=qr&chl='.$urlencoded.''; }

  /**

  • Check if the code is correct. This will accept codes starting from $discrepancy30sec ago to $discrepancy30sec from now.
  • @param string $secret
  • @param string $code
  • @param int $discrepancy This is the allowed time drift in 30 second units (8 means 4 minutes before or after)
  • @param int|null $currentTimeSlice time slice if we want use other that time()

  • @return bool */ public function verifyCode($secret, $code, $discrepancy = 1, $currentTimeSlice = null) { if ($currentTimeSlice === null) { $currentTimeSlice = floor(time() / 30); } // var_export(strlen($code)); if (strlen($code) < 6) { return false; }

    for ($i = -$discrepancy; $i <= $discrepancy; ++$i) { $calculatedCode = $this->getCode($secret, $currentTimeSlice + $i); // var_export($this->timingSafeEquals($calculatedCode, $code)); if ($this->timingSafeEquals($calculatedCode, $code)) { return true; } }

    return false; }

  /**

  • Set the code length, should be >=6.
  • @param int $length

  • @return PHPGangsta_GoogleAuthenticator */ public function setCodeLength($length) { $this->_codeLength = $length;

    return $this; }

  /**

  • Helper class to decode base32.
  • @param $secret

  • @return bool|string */ protected function _base32Decode($secret) { if (empty($secret)) { return ''; }

    $base32chars = $this->_getBase32LookupTable(); $base32charsFlipped = array_flip($base32chars);

    $paddingCharCount = substr_count($secret, $base32chars[32]); $allowedValues = array(6, 4, 3, 1, 0); if (!in_array($paddingCharCount, $allowedValues)) { return false; } for ($i = 0; $i < 4; ++$i) { if ($paddingCharCount == $allowedValues[$i] && substr($secret, -($allowedValues[$i])) != str_repeat($base32chars[32], $allowedValues[$i])) { return false; } } $secret = str_replace('=', '', $secret); $secret = str_split($secret); $binaryString = ''; for ($i = 0; $i < count($secret); $i = $i + 8) { $x = ''; if (!in_array($secret[$i], $base32chars)) { return false; } for ($j = 0; $j < 8; ++$j) { $x .= str_pad(base_convert(@$base32charsFlipped[@$secret[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT); } $eightBits = str_split($x, 8); for ($z = 0; $z < count($eightBits); ++$z) { $binaryString .= (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : ''; } }

    return $binaryString; }

  /**

  • Get array with all 32 characters for decoding from/encoding to base32.
  • @return array */ protected function _getBase32LookupTable() { return array( 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 7 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23 'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31 '=', // padding char ); }

  /**

  • A timing safe equals comparison
  • more info here: http://blog.ircmaxell.com/2014/11/its-all-about-time.html.
  • @param string $safeString The internal (safe) value to be checked
  • @param string $userString The user submitted (unsafe) value

  • @return bool True if the two strings are identical */ protected function timingSafeEquals($safeString, $userString) { // if (function_exists('hash_equals')) { // return hash_equals($safeString, $userString); // }

    $safeLen = strlen($safeString); $userLen = strlen($userString);

    if ($userLen !== $safeLen) { return false; }

    // var_dump($safeLen); // var_dump($userLen);die; $result = 0;

    for ($i = 0; $i < $userLen; ++$i) { $result |= (ord($safeString[$i]) ^ ord($userString[$i])); }

    // They are only identical strings if $result is exactly 0... // return $result ===0; return $result; } } `