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Serverside U2F library for PHP. Provides functionality for registering tokens and authentication with said tokens.

To read more about U2F and how to use a U2F library, visit


The project is licensed under a BSD license. See the file COPYING for exact wording. For any copyright year range specified as YYYY-ZZZZ in this package note that the range specifies every single year in that closed interval.


The only dependency is the openssl extension to PHP that has to be enabled.

A composer.json is included in the distribution to make things simpler for other project using composer.


To run the test suite PHPUnit is required. To run it, type:

$ phpunit