Further integration and projects
For further integration with the YubiKey, users may access free low-level libraries which cover the decryption and parsing of Yubico One-Time Passwords, allowing for existing validation servers or applications to work with YubiKeys, or to take advantage of the YubiKey Challenge-Response configuration for offline validation.
Yubico also provides libraries for the programming of YubiKey hardware tokens, allowing integrators to create their own tools to program YubiKeys to their own specifications. Integrators can create their own applications for configuring YubiKeys, which they may distribute to their own customers.
We support independent efforts to develop for the YubiKey, and offer source code to many of the projects on GitHub, including many different Linux packaging options for YubiKey validation services, python and c libraries, and the source code for existing Yubico Applications such as the Yubico Windows Authentication tool.