== libfido2

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*libfido2* provides library functionality and command-line tools to
communicate with a FIDO device over USB, and to verify attestation and
assertion signatures.

*libfido2* supports the FIDO U2F (CTAP 1) and FIDO 2.0 (CTAP 2) protocols.

For usage, see the `examples/` directory.

=== License

*libfido2* is licensed under the BSD 2-clause license. See the LICENSE
file for the full license text.

=== Supported Platforms

*libfido2* is known to work on Linux, macOS, Windows, OpenBSD, and FreeBSD.

NFC support is available on Linux and Windows.

=== Documentation

Documentation is available in troff and HTML formats. An
https://developers.yubico.com/libfido2/Manuals/[online mirror of *libfido2*'s documentation]
is also available.

=== Bindings

* .NET: https://github.com/borrrden/Fido2Net[Fido2Net]
* Go: https://github.com/keys-pub/go-libfido2[go-libfido2]
* Perl: https://github.com/jacquesg/p5-FIDO-Raw[p5-FIDO-Raw]
* Rust: https://github.com/PvdBerg1998/libfido2[libfido2]

=== Installation

==== Releases

The current release of *libfido2* is 1.9.0. Please consult Yubico's
https://developers.yubico.com/libfido2/Releases[release page] for source
and binary releases.

==== Ubuntu 20.04 (Focal)

  $ sudo apt install libfido2-1
  $ sudo apt install libfido2-dev
  $ sudo apt install libfido2-doc

Alternatively, newer versions of *libfido2* are available in Yubico's PPA.
Follow the instructions for Ubuntu 18.04 (Bionic) below.

==== Ubuntu 18.04 (Bionic)

  $ sudo apt install software-properties-common
  $ sudo apt-add-repository ppa:yubico/stable
  $ sudo apt update
  $ sudo apt install libfido2-dev

==== macOS

  $ brew install libfido2

Or from source, on UNIX-like systems:

  $ cmake -B build
  $ make -C build
  $ sudo make -C build install

Depending on the platform,
https://www.freedesktop.org/wiki/Software/pkg-config/[pkg-config] may need to
be installed, or the PKG_CONFIG_PATH environment variable set.

*libfido2* depends on https://github.com/pjk/libcbor[libcbor],
https://www.openssl.org[OpenSSL] 1.1 or newer, and https://zlib.net[zlib].
On Linux, libudev
(part of https://www.freedesktop.org/wiki/Software/systemd[systemd]) is also
required.

For complete, OS-specific installation instructions, please refer to the
`.actions/` (Linux, macOS) and `windows/` directories.

On Linux, you will need to add a udev rule to be able to access the FIDO
device, or run as root. For example, the udev rule may contain the following:

----
#udev rule for allowing HID access to Yubico devices for FIDO support.

KERNEL=="hidraw*", SUBSYSTEM=="hidraw", \
  MODE="0664", GROUP="plugdev", ATTRS{idVendor}=="1050"
----
