[erik998]

Not exactly Yubikey but USB Armory has some close features:

https://www.crowdsupply.com/inverse-path/usb-armory

The following example security application ideas illustrate the flexibility of the USB Armory concept:

    mass storage device with advanced features such as automatic encryption, virus scanning, host authentication and data self-destruct
    OpenSSH client and agent for untrusted hosts (e.g Internet kiosks)
    router for end-to-end VPN tunnelling
    Tor bridge [see this, for example]
    password manager with integrated web server
    electronic wallet [the Electrum Bitcoin wallet works out of the box on the USB Armory. It has been tested with X11 forwarding from Linux as well as Windows hosts.]
    authentication token
    portable penetration testing platform
    low level USB security testing