Server-side U2F library for Erlang

Implements the Universial Second Factor protocol as specified by the FIDO Alliance. Only tested with devices from Yubico.

The library supports three operations:

Generate challenge

Generates a random 32 bytes challenge that is base64url encoded.

Register response

Handles the registration response from the client. If successful it returns the public key and the key handle, otherwise it will raise an exception.

Signature response

Handles the signature response from the client. If successful it returns the new counter value, otherwise it will raise an exception.

Build

$ make compile