Yubico Forum

With a USB FIDO U2F key, the authentication flow is handled by the browser on the client side (today this means Chrome, but Firefox seems committed as well) where the low-level JavaScript API is available. Yubico has provided the high-level JavaScript API by means of a small library (as documented here).

The steps are basically these:

• Get challenge from server (server generates challenge for registered devices)
• Sign with U2F key (user touches button of key)
• Send response to server (server validates response)

How does this work with NFC FIDO U2F keys such as the Yubikey Neo? If I am reading the specifications correctly, the server-side of the authentication flow is exactly the same. Is the same high-level JasvaScript API used in the browser? That is, does Chrome on Android provide the low-level JavaScript API for use with an NFC FIDO U2F token, or is another tool such as Google Authenticator required?