U2F USB token optimized for physical security, affordability, and style

Solo 1 firmware in C

Pluggable Authentication Module (PAM) for U2F and FIDO2

Core implementations of an open-source secure key

u2f token firmware for stm32f103 and efm32hg boards

An Open-Source FIDO U2F implementation on nRF52 SoC

Create a FIDO2/U2F token using ESP32

Universal 2nd Factor (U2F) Emulation C Library

U2F-Emulated

Firmware for Nitrokey FIDO U2F

U2F key protocol over RawHID

An attempt to build solo for the ESP32

A smartcard keyboard firmware, based on Nitrokey Pro

Provides library functionality for FIDO 2.0, including communication with a device over USB.