Exemple de partage de code pour implémenter l'algorithme de mot de passe dynamique OATH en PHP

Exemple de partage de code pour l'implémentation de l'algorithme de mot de passe dynamique OATH en PHP

<?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;    // Interval between key regeneration  
    const otpLength        = 6;    // 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(&#39;/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ234567]+$/&#39;, $b32, $match))  
            throw new Exception(&#39;Invalid characters in the base32 string.&#39;);  
  
        $l     = strlen($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(&#39;Secret key is too short. Must be at least 16 base 32 characters&#39;);  
  
        $bin_counter = pack(&#39;N*&#39;, 0) . pack(&#39;N*&#39;, $counter);        // Counter must be 64-bit int  
        $hash      = hash_hmac (&#39;sha1&#39;, $bin_counter, $key, true);  
  
        return str_pad(self::oath_truncate($hash), self::otpLength, &#39;0&#39;, 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 = "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);  
  
?>

Enregistrez ce qui précède content Pour oath.php, il existe deux façons de tester et d'exécuter :

1. Exécutez la ligne de commande : php.exe oath.php

Problème de chemin Tout le monde le connaît

2. Déployez-le dans le répertoire web et accédez-y via la page web

Par exemple : http:/ /localhost/oath.php

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