#  PHP library for Two Factor Authentication
[](https://github.com/RobThree/TwoFactorAuth/actions?query=branch%3Amaster) [](https://packagist.org/packages/robthree/twofactorauth) [](LICENSE) [](https://packagist.org/packages/robthree/twofactorauth) [](https://codeclimate.com/github/RobThree/TwoFactorAuth) [](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=6MB5M2SQLP636 "Keep me off the streets")
PHP library for [two-factor (or multi-factor) authentication](http://en.wikipedia.org/wiki/Multi-factor_authentication) using [TOTP](http://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm) and [QR-codes](http://en.wikipedia.org/wiki/QR_code). Inspired by, based on but most importantly an *improvement* on '[PHPGangsta/GoogleAuthenticator](https://github.com/PHPGangsta/GoogleAuthenticator)'. There's a [.Net implementation](https://github.com/RobThree/TwoFactorAuth.Net) of this library as well.
* [cURL](http://php.net/manual/en/book.curl.php) when using the provided `QRServerProvider` (default), `ImageChartsQRCodeProvider` or `QRicketProvider` but you can also provide your own QR-code provider.
* [random_bytes()](http://php.net/manual/en/function.random-bytes.php), [MCrypt](http://php.net/manual/en/book.mcrypt.php), [OpenSSL](http://php.net/manual/en/book.openssl.php) or [Hash](http://php.net/manual/en/book.hash.php) depending on which built-in RNG you use (TwoFactorAuth will try to 'autodetect' and use the best available); however: feel free to provide your own (CS)RNG.
For a quick start, have a look at the [getting started](https://robthree.github.io/TwoFactorAuth/getting-started.html) page or try out the [demo](demo/demo.php).
If you need more in-depth information about the configuration available then you can read through the rest of [documentation](https://robthree.github.io/TwoFactorAuth).
