== libfido2
image:https://github.com/yubico/libfido2/workflows/linux/badge.svg["Linux Build Status (github actions)", link="https://github.com/Yubico/libfido2/actions"]
image:https://github.com/yubico/libfido2/workflows/macos/badge.svg["macOS Build Status (github actions)", link="https://github.com/Yubico/libfido2/actions"]
image:https://github.com/yubico/libfido2/workflows/windows/badge.svg["Windows Build Status (github actions)", link="https://github.com/Yubico/libfido2/actions"]
image:https://github.com/yubico/libfido2/workflows/fuzzer/badge.svg["Fuzz Status (github actions)", link="https://github.com/Yubico/libfido2/actions"]
image:https://oss-fuzz-build-logs.storage.googleapis.com/badges/libfido2.svg["Fuzz Status (oss-fuzz)", link="https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:libfido2"]
*libfido2* provides library functionality and command-line tools to
communicate with a FIDO device over USB or NFC, and to verify attestation and
assertion signatures.
*libfido2* supports the FIDO U2F (CTAP 1) and FIDO2 (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.
=== 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]
=== Releases
The current release of *libfido2* is 1.13.0. Signed release tarballs are
available at Yubico's
https://developers.yubico.com/libfido2/Releases[release page].
=== Dependencies
*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.
=== Installation
==== Fedora 35 and 34
$ sudo dnf install libfido2 libfido2-devel fido2-tools
==== Ubuntu 22.04 (Jammy) and 20.04 (Focal)
$ sudo apt install libfido2-1 libfido2-dev libfido2-doc fido2-tools
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 libfido2-1 libfido2-dev libfido2-doc fido2-tools
On Linux, you may need to add a udev rule to be able to access the FIDO
device. 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"
----
==== macOS
$ brew install libfido2
==== Windows
Please consult Yubico's
https://developers.yubico.com/libfido2/Releases[release page] for ARM, ARM64,
Win32, and Win64 artefacts.
=== Building 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. For complete,
OS-specific build instructions, please refer to the `.actions/`
(Linux, macOS, BSD) and `windows/` directories.
=== Build-time Customisation
*libfido2* supports a number of CMake options. Some of the options require
additional dependencies. Options that are disabled by default are not
officially supported.
[%autowidth.stretch]
|===
|*Option* |*Description* |*Default*
| BUILD_EXAMPLES | Build example programs | ON
| BUILD_MANPAGES | Build man pages | ON
| BUILD_SHARED_LIBS | Build a shared library | ON
| BUILD_STATIC_LIBS | Build a static library | ON
| BUILD_TOOLS | Build auxiliary tools | ON
| FUZZ | Enable fuzzing instrumentation | OFF
| NFC_LINUX | Enable netlink NFC support on Linux | ON
| USE_HIDAPI | Use hidapi as the HID backend | OFF
| USE_PCSC | Enable experimental PCSC support | OFF
| USE_WINHELLO | Abstract Windows Hello as a FIDO device | ON
|===
The USE_HIDAPI option requires https://github.com/libusb/hidapi[hidapi]. The
USE_PCSC option requires https://github.com/LudovicRousseau/PCSC[pcsc-lite] on
Linux.
=== Development
Please use https://github.com/Yubico/libfido2/discussions[GitHub Discussions]
to ask questions and suggest features, and
https://github.com/Yubico/libfido2/pulls[GitHub pull-requests] for code
contributions.
=== Reporting bugs
Please use https://github.com/Yubico/libfido2/issues[GitHub Issues] to report
bugs. To report security issues, please contact security@yubico.com. A PGP
public key can be found at
https://www.yubico.com/support/security-advisories/issue-rating-system/.
