> Hopefully these will be useful to others writing Yubikey-based applications. Definitely! HMAC-SHA256 is nice and I was wondering if the TOTP feature of Yubik

> Hopefully these will be useful to others writing Yubikey-based applications. Definitely! HMAC-SHA256 is nice and I was wondering if the TOTP feature of Yubikeys can be (ab)used for anything else that also uses HMAC-SHA256 (e.g. Macaroons). I'll take some time to digest your code, thanks!