Server-side U2F library for Erlang
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Implements the Universial Second Factor protocol as specified by the [FIDO Alliance](https://fidoalliance.org/specifications/download/). Only tested with devices from [Yubico](https://www.yubico.com/applications/fido/).

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
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    $ make compile