Summary: Library for FIDO 2.0, including communication with a device over USB

Description:
Provides library functionality for communicating with a FIDO device over USB as
well as verifying attestation and assertion signatures.

This library aims to support the FIDO U2F and FIDO 2.0 protocols for
communicating with a USB authenticator via the Client-to-Authenticator Protocol
(CTAP 1 and 2). In addition to this low-level device access, classes defined in
the `fido2.client` and `fido2.server` modules implement higher level operations
which are useful when interfacing with an Authenticator, or when implementing
WebAuthn support for a Relying Party.

Maintainer: danf