<"A" => 0, "B" => 1,
  "C" => 2, "D" => 3,
  "E" => 4, "F" => 5,
  "G" => 6, "H" => 7,
  "I" => 8, "J" => 9,
  "K" => 10, "L" => 11,
  "M" => 12, "N" => 13,
  "O" => 14, "P" => 15,
  "Q" => 16, "R" => 17,
  "S" => 18, "T" => 19,
  "U" => 20, "V" => 21,
  "W" => 22, "X" => 23,
  "Y" => 24, "Z" => 25,
  "2" => 26, "3" => 27,
  "4" => 28, "5" => 29,
  "6" => 30, "7" => 31
 );

 /**
  * Generates a 16 digit secret key in base32 format
  * @return string
  **/
 public static function generate_secret_key($length = 16) {
  $b32  = "234567QWERTYUIOPASDFGHJKLZXCVBNM";
  $s  = "";

  for ($i = 0; $i < $length; $i++)
   $s .= $b32[rand(0,31)];

  return $s;
 }

 /**
  * Returns the current Unix Timestamp devided by the keyRegeneration
  * period.
  * @return integer
  **/
 public static function get_timestamp() {
  return floor(microtime(true)/self::keyRegeneration);
 }

 /**
  * Decodes a base32 string into a binary string.
  **/
 public static function base32_decode($b32) {

  $b32  = strtoupper($b32);

  if (!preg_match('/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ234567]+$/', $b32, $match))
   throw new Exception('Invalid characters in the base32 string.');

  $l  = strlen($b32);
  $n = 0;
  $j = 0;
  $binary = "";

  for ($i = 0; $i < $l; $i++) {

   $n = $n << 5;     // Move buffer left by 5 to make room
   $n = $n + self::$lut[$b32[$i]];  // Add value into buffer
   $j = $j + 5;    // Keep track of number of bits in buffer

   if ($j >= 8) {
    $j = $j - 8;
    $binary .= chr(($n & (0xFF << $j))  $j);
   }
  }

  return $binary;
 }
 /*by tang*/  
 public static function base32_encode($data, $length){
  $basestr = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
  $count = 0;
  if ($length > 0) {
   $buffer = $data[0];
   $next = 1;
   $bitsLeft = 8;

   while (($bitsLeft > 0 || $next < $length)) {
    if ($bitsLeft < 5) {
    if ($next < $length) {
     $buffer <<= 8;
     $buffer |= $data[$next++] & 0xFF;
     $bitsLeft += 8;
    } else {
     $pad = 5 - $bitsLeft;
     $buffer <<= $pad;
     $bitsLeft += $pad;
    }
    }
    $index = 0x1F & ($buffer  ($bitsLeft - 5));
    $bitsLeft -= 5;
    $result .= $basestr[$index];
    $count++;
   }
   }
   return $result;  
 }
 /**
  * Takes the secret key and the timestamp and returns the one time
  * password.
  *
  * @param binary $key - Secret key in binary form.
  * @param integer $counter - Timestamp as returned by get_timestamp.
  * @return string
  **/
 public static function oath_hotp($key, $counter)
 {
  if (strlen($key) < 8)
  throw new Exception('Secret key is too short. Must be at least 16 base 32 characters');

  $bin_counter = pack('N*', 0) . pack('N*', $counter);  // Counter must be 64-bit int
  $hash  = hash_hmac ('sha1', $bin_counter, $key, true);

  return str_pad(self::oath_truncate($hash), self::otpLength, '0', STR_PAD_LEFT);
 }

 /**
  * Verifys a user inputted key against the current timestamp. Checks $window
  * keys either side of the timestamp.
  *
  * @param string $b32seed
  * @param string $key - User specified key
  * @param integer $window
  * @param boolean $useTimeStamp
  * @return boolean
  **/
 public static function verify_key($b32seed, $key, $window = 5, $useTimeStamp = true) {

  $timeStamp = self::get_timestamp();

  if ($useTimeStamp !== true) $timeStamp = (int)$useTimeStamp;

  $binarySeed = self::base32_decode($b32seed);

  for ($ts = $timeStamp - $window; $ts <= $timeStamp + $window; $ts++)
   if (self::oath_hotp($binarySeed, $ts) == $key)
    return true;

  return false;

 }

 /**
  * Extracts the OTP from the SHA1 hash.
  * @param binary $hash
  * @return integer
  **/
 public static function oath_truncate($hash)
 {
  $offset = ord($hash[19]) & 0xf;

  return (
   ((ord($hash[$offset+0]) & 0x7f) << 24 ) |
   ((ord($hash[$offset+1]) & 0xff) << 16 ) |
   ((ord($hash[$offset+2]) & 0xff) << 8 ) |
   (ord($hash[$offset+3]) & 0xff)
  ) % pow(10, self::otpLength);
 }


}
/*
$InitalizationKey = "LFLFMU2SGVCUIUCZKBMEKRKLIQ";     // Set the inital key

$TimeStamp  = Google2FA::get_timestamp();
$secretkey  = Google2FA::base32_decode($InitalizationKey); // Decode it into binary
$otp    = Google2FA::oath_hotp($secretkey, $TimeStamp); // Get current token

echo("Init key: $InitalizationKey\n");
echo("Timestamp: $TimeStamp\n");
echo("One time password: $otp\n");

// Use this to verify a key as it allows for some time drift.

$result = Google2FA::verify_key($InitalizationKey, "123456");

var_dump($result);
*/
"htmlcode">

<"color: #800000">1）、开通动态口令

在原有系统的修改密码页面，加上认证方式的选择，例如：

如果用户选择动态口令方式，则会生成一张二维码显示在页面，用于用户开通动态口令。为了兼容google authtication，其二维码格式与谷歌一样。生成二维码的方法见我的另一篇《Thinkphp3.2.3整合phpqrcode生成带logo的二维码》 。 

生成密钥二维码代码如下：


public function qrcode()
 { 
  Vendor('oath.base32');
  $base32 = new \Base32();
  $rand = random(16);//生成随机种子
  $rand = $base32->encode($rand);
  $rand=str_replace('=','',$rand);//去除填充的‘='

  $errorCorrectionLevel =intval(3) ;//容错级别 
  $matrixPointSize = intval(8);//生成图片大小

  //生成二维码图片 
  Vendor('phpqrcode.phpqrcode');
  $object = new \QRcode();
  $text = sprintf("otpauth://totp/%s", $user, $rand);
  $object->png($text, false, $errorCorrectionLevel, $matrixPointSize, 2);

  生成的种子$rand保存到数据库的temp_seed字段
 }




random是生成随机字符串函数。$rand=str_replace('=','',$rand)这句代码是因为谷歌手机令牌中base32解码算法并没有填充的‘='号。 


验证用户动态口令的代码如下：


从数据库读取temp_seed
Vendor('oath.oath');
$object = new \Google2FA();
if($object->verify_key($temp_seed, $otp)){
 验证成功，将数据库更新seed为temp_seed，auth_type为1，last_otp为otp
}




2）、动态口令登录
用户动态口令登录验证的代码：
从数据库读取auth_type,seed,last_otp字段。




if($auth_type==1){//动态口令
 //防止重复认证    
 if($lat_otp == $otp) {
  动态口令重复使用返回    
 }
 Vendor('oath.oath');
 $object = new \Google2FA();
 if(!$object->verify_key($seed, $otp))
 {
  动态口令不正确
 }
 else
 {
  登录成功，将数据库更新last_otp为$otp,last_logintime为time()
 }    
}



4、测试验证
下载google authtication，使用静态密码登录系统，进入修改密码页面。 

打开google authtication，扫描二维码，会显示动态口令。


保存内容，开通动态口令成功！ 

然后你就可以用高大上的动态口令登录系统了!
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。