- <?php
- namespace google;
- class Goole
- {
- 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 = $this->_getBase32LookupTable();
- // Valid secret lengths are 80 to 640 bits
- if ($secretLength < 16 || $secretLength > 128) {
- throw new \Exception('Bad secret length');
- }
- $secret = '';
- $rnd = false;
- if (function_exists('random_bytes')) {
- $rnd = random_bytes($secretLength);
- } elseif (function_exists('mcrypt_create_iv')) {
- $rnd = random_bytes($secretLength, MCRYPT_DEV_URANDOM);
- } elseif (function_exists('openssl_random_pseudo_bytes')) {
- $rnd = openssl_random_pseudo_bytes($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'] : 200;
- $height = !empty($params['height']) && (int) $params['height'] > 0 ? (int) $params['height'] : 200;
- $level = !empty($params['level']) && array_search($params['level'], array('L', 'M', 'Q', 'H')) !== false ? $params['level'] : 'M';
- $urlencoded = urlencode('otpauth://totp/'.$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 $discrepancy*30sec ago to $discrepancy*30sec 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) {
- $currentTimeSlice = floor(time() / 30);
- }
- if (strlen($code) != 6) {
- return false;
- }
- for ($i = -$discrepancy; $i <= $discrepancy; ++$i) {
- $calculatedCode = $this->getCode($secret, $currentTimeSlice + $i);
- if ($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 $userString The user submitted (unsafe) value
- *
- * @return bool True if the two strings are identical
- */
- private function timingSafeEquals($safeString, $userString)
- {
- if (function_exists('hash_equals')) {
- return hash_equals($safeString, $userString);
- }
- $safeLen = strlen($safeString);
- $userLen = strlen($userString);
- if ($userLen != $safeLen) {
- return false;
- }
- $result = 0;
- for ($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;
- }
- }
使用方法:
- $checkResult = $ga->verifyCode($secret, $code, 1);
- if ($checkResult) {
- echo '匹配! OK';
- } else {
- echo '不匹配! FAILED';
- }
- ___________________________________相对来说我跟喜欢下面这种用法,实时的
- $oneCode = '837476'; //用户输入的
- $secre = '4BPFQVCGJGUVQVBL'; //数据库取出来的(用户注册时第一次生成的)
- $a = $ga->getCode($secre);
- if ($a == $oneCode) {
- return '成功';
- } else {
- return '失败';
- }
- 生成二维码也可以用这个方法
- $qrCodeUrl = $ga->getQRCodeGoogleUrl('asdasdas', $secret);
- //第一个参数是"标识",第二个参数为"安全密匙SecretKey"
- 生成二维码信息echo '<img src="'.$qrCodeUrl.'">';
然后下载谷歌验证器绑定key就可以使用
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