pure Perl FIDO U2F server library

 Authen::U2F provides the tools needed to add support for U2F in an application.
 .
 This module does not handle the wire encoding of U2F challenges and response,
 as these are different depending on the U2F host you're using and the style of
 your application. In the examples dir there are scripts that implement the 1.0
 wire format, used by Yubico's libu2f-host, and a Plack application that works
 with Google's JavaScript module.