参考以下内容：
加密php页面： http://girlswhogeek.com/tutorials/2006/creating-a-secure-php-login-page
Google Authentication for PHP： http://www.idontplaydarts.com/wp-content/uploads/2011/07/ga.php_.txt
Google Authentication 的二维码生成： http://fiddle.jshell.net/russau/ch8PK/show/
html5 google authenticator： https://github.com/gbraad/html5-google-authenticator
文件说明：
otpprotected.php 用动态密码加密php页面演示。
Time-based One-time Password Algorithm/1.html 查看动态密码。生成二维码。
Time-based One-time Password Algorithm/2.html 查看动态密码。可放在手机里直接用html查看工具打开。
html5-google-authenticator-master 如题。备用动态密码查看方案，用法自己研究去吧。
未解决问题：
在cookie的时间设置上，有点问题，我也不会改，有经验的可以帮着解决。
注意事项：
此方法加密页面，默认参数下，可以配合google两步验证软件使用。
比较粗糙，只能给个人主页网站折腾玩的。请注意，本人只会google。
版权什么的，请具体参照上述网址的版权说明。
<?php /** * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * PHP Google two-factor authentication module. * * See http://www.idontplaydarts.com/2011/07/google-totp-two-factor-authentication-for-php/ * for more details * * @author Phil **/ class Google2FA { const keyRegeneration = 30; // 动态密码更新时间。Interval between key regeneration const otpLength = 6; // 动态密码长度。默认更新时间30秒，长度6位。可通过手机安装google authenticator查看动态密码。如更改这两项，则需要下载附件中提供的动态密码查看工具。Length of the Token generated private static $lut = array( // Lookup needed for Base32 encoding "A" => 0, "B" => 1, "C" => 2, "D" => 3, "E" => 4, "F" => 5, "G" => 6, "H" => 7, "I" => 8, "J" => 9, "K" => 10, "L" => 11, "M" => 12, "N" => 13, "O" => 14, "P" => 15, "Q" => 16, "R" => 17, "S" => 18, "T" => 19, "U" => 20, "V" => 21, "W" => 22, "X" => 23, "Y" => 24, "Z" => 25, "2" => 26, "3" => 27, "4" => 28, "5" => 29, "6" => 30, "7" => 31 ); /** * Generates a 16 digit secret key in base32 format * @return string **/ public static function generate_secret_key($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; } /** * 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 = 4, $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 = "JBSWY3DPEHPK3PXP"; // 密钥。注意安全。可将下列网址中的XXXXXXXX替换为具体密钥生成二维码。 https://chart.googleapis.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth%3A%2F%2Ftotp%2FBlog%3Fsecret%3DXXXXXXXX $TimeStamp = Google2FA::get_timestamp(); $secretkey = Google2FA::base32_decode($InitalizationKey); // Decode it into binary $otp = Google2FA::oath_hotp($secretkey, $TimeStamp); // Get current token //以下加密部分，参照 http://girlswhogeek.com/tutorials/2006/creating-a-secure-php-login-page $randomwordz = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; // 随便改一改，因为是动态密码的。这个也没什么用。 if (isset($_COOKIE['MyLoginPage'])) { if ($_COOKIE['MyLoginPage'] == md5($otp.$randomwordz)) { ?> 需要加密的内容，放在这里。 <?php exit; } else { setcookie('MyLoginPage', md5($_POST['pass'].$randomwordz), time() - 3600); echo "<p>Refresh the page and try again.</p>"; exit; } } if (isset($_GET['p']) && $_GET['p'] == "opt") { if ($_POST['pass'] != $otp) { echo "<p>Sorry, that password does not match. Use your browser back button to go back and try again.</p>"; exit; } else if ($_POST['pass'] == $otp) { setcookie('MyLoginPage', md5($_POST['pass'].$randomwordz), time()+30); //如果要用这个加密登录页面，最好把cookie有效时间改为60*3或*2，上面的keyRegeneration也要相应改为180或120，动态密码长度最好也改成8位以上。不然你来不及输入登录信息。 header("Location: $_SERVER[PHP_SELF]"); } else { echo "<p>Sorry, you could not be logged in at this time. Refresh the page and try again.</p>"; } } ?> <?php echo "<!doctype html>"; ?> <html lang="en-gb"> <head> <meta charset="utf-8"> <title>OTP protected PAGE</title> <meta name="author" content="zhuaxiaomao" /> </head> <body> <div id="login"> <form action="<?php echo $_SERVER['PHP_SELF']; ?>?p=opt" method="post"> <input type="password" name="pass" id="pass" /> <input type="submit" id="submit" value="Login" /> </form> </div> </body> </html>
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