libu2f-server ☆
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Description:
Server-side of the Universal 2nd Factor (U2F) protocol
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  @Yubico  |  formulae.brew.sh
Category: Security
Tags: security authentication u2f library c crypto
Install: brew install libu2f-server
About:
Libu2f-server is a C library that handles the server-side component of the Universal 2nd Factor (U2F) protocol. It provides essential functions for validating registration and authentication responses from U2F devices, such as YubiKeys. This library enables developers to integrate strong two-factor authentication into their server applications without managing low-level cryptographic details.
Key Features:
  • Handles U2F registration and authentication logic
  • Validates device responses and cryptographic signatures
  • Lightweight C library for easy integration
  • Supports the official FIDO U2F specifications
Use Cases:
  • Integrating hardware-based 2FA into web services
  • Building custom authentication servers for U2F tokens
  • Validating U2F challenges in backend applications
Alternatives:
  • libfido2 – Modern successor supporting FIDO2/WebAuthn, while libu2f-server is specific to the older U2F standard.
  • PAM U2F – A PAM module for system login, whereas libu2f-server is a library for building custom applications.
Version History
Detected Version Rev Change Commit
Oct 27, 2024 12:49pm 3 VERSION_BUMP f982c5e9
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