libyubikey ☆

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Description:
C library for manipulating Yubico one-time passwords

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | @yubico | formulae.brew.sh

Category: Security

Tags: security authentication hardware-token yubikey c-library otp

Install: brew install libyubikey

About:
Libyubikey is a low-level C library that provides an API for interacting with Yubico's YubiKey hardware tokens. It handles the cryptographic operations needed to validate Yubico OTP (One-Time Password) and HMAC-SHA1 challenge-response authentication. This library serves as a foundational component for developers building custom authentication systems or integrating YubiKey support into existing applications.

Key Features:

Support for Yubico OTP validation and generation
HMAC-SHA1 challenge-response functionality
Low-level C API for maximum performance and control
Hardware token interaction and cryptographic operations

Use Cases:

Building custom two-factor authentication (2FA) systems
Integrating YubiKey hardware token support into C/C++ applications
Validating Yubico OTPs for secure login implementations

Alternatives:

libfido2 – More modern library supporting FIDO2/WebAuthn standards, while libyubikey focuses on legacy Yubico OTP protocols
ykpers – Higher-level library for configuring YubiKeys, whereas libyubikey provides core cryptographic primitives

Version History

Detected	Version	Rev	Change	Commit
Sep 11, 2025 5:40am		0	VERSION_BUMP	02cd8a46
Sep 17, 2023 12:26pm		0	VERSION_BUMP	82195454