libfido2 ☆
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Description:
Provides library functionality for FIDO U2F & FIDO 2.0, including USB
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  @yubico  |  formulae.brew.sh
Category: Security
Tags: security fido2 u2f authentication hardware-key cryptography
Install: brew install libfido2
About:
Libfido2 is an open-source library designed to provide client-side functionality for the FIDO U2F and FIDO 2.0 protocols. It enables applications to authenticate users via hardware security keys over USB, handling the cryptographic operations required for secure web authentication. Its primary value is offering a standardized, cross-platform C library for integrating hardware-backed security into applications.
Key Features:
  • Supports both FIDO U2F and FIDO 2.0/WebAuthn standards
  • Provides command-line tools for managing and verifying security keys
  • Cross-platform support (Linux, macOS, Windows, FreeBSD)
  • Lightweight C library with minimal dependencies
Use Cases:
  • Integrating hardware security key authentication into custom applications
  • Developing server-side components that interact with FIDO clients
  • Managing and testing FIDO/U2F keys via command-line utilities
Alternatives:
  • pam_u2f – PAM module for Linux authentication, whereas libfido2 provides the underlying library to build such integrations.
Version History
Detected Version Rev Change Commit
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