PHP code example of christian-riesen / otp

1. Go to this page and download the library: Download christian-riesen/otp library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

christian-riesen / otp example snippets




use Otp\Otp;
use Otp\GoogleAuthenticator;
use ParagonIE\ConstantTime\Encoding;

// Get a Pseudo Secret
// Defaults to 16 characters
$secret = GoogleAuthenticator::generateRandom();

// Url for the QR code
// Using totp method
$url = GoogleAuthenticator::getQrCodeUrl('totp', 'Label like [email protected]', $secret);

// Save the secret with the users account
// Display QR Code to the user

// Now how to check
$otp = new Otp();

// $key is a 6 digit number, coming from the User
// Assuming this is present and sanitized
// Allows for a 1 code time drift by default
// Third parameter can alter that behavior
if ($otp->checkTotp(Encoding::base32DecodeUpper($secret), $key)) {
    // Correct key
    // IMPORTANT! Note this key as being used
    // so nobody could launch a replay attack.
    // Cache that for the next minutes and you
    // should be good.
} else {
    // Wrong key
}

// Just to create a key for display (testing)
$key = $otp->totp(Encoding::base32DecodeUpper($secret));