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# ![Logo](https://raw.githubusercontent.com/RobThree/TwoFactorAuth/master/logo.png) PHP library for Two Factor Authentication

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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.

## Requirements

* Tested on PHP 5.6 up to 8.0
* [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.

Optionally, you may need:

* [sockets](https://www.php.net/manual/en/book.sockets.php) if you are using `NTPTimeProvider`
* [endroid/qr-code](https://github.com/endroid/qr-code) if using `EndroidQrCodeProvider` or `EndroidQrCodeWithLogoProvider`.
* [bacon/bacon-qr-code](https://github.com/Bacon/BaconQrCode) if using `BaconQrCodeProvider`.

## Installation

The best way of installing this library is with composer:

`php composer.phar require robthree/twofactorauth`

## Usage

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).

## Integrations

- [CakePHP 3](https://github.com/andrej-griniuk/cakephp-two-factor-auth)

## License

Licensed under MIT license. See [LICENSE](https://raw.githubusercontent.com/RobThree/TwoFactorAuth/master/LICENSE) for details.

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