# <img alt="OpenSK logo" src="docs/img/OpenSK.svg" width="200px">

This branch is unmaintained. It implements the CTAP 2.0 version of OpenSK.
Please check out the default branch for maintained code.
If you are a developer, go to the
[develop branch](https://github.com/google/OpenSK/tree/develop).

## OpenSK

This repository contains a Rust implementation of a
[FIDO2](https://fidoalliance.org/fido2/) authenticator.
We developed OpenSK as a [Tock OS](https://tockos.org) application.

We intend to bring a full open source experience to security keys, from
application to operating system. You can even 3D print your own open source
enclosure!
You can see OpenSK in action in this
[video on YouTube](https://www.youtube.com/watch?v=klEozvpw0xg)!

### FIDO2

This branch implements the
[CTAP2.0 specification](https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html)
and is FIDO certified. OpenSK supports U2F, and non-discoverable credentials
created with either protocol are compatible with the other.

### :warning: Disclaimer

This project is **proof-of-concept and a research platform**. It is **NOT**
meant for a daily usage. The cryptography implementations are not resistent
against side-channel attacks.

We're still in the process of integrating the
[ARM&reg; CryptoCell-310](https://developer.arm.com/ip-products/security-ip/cryptocell-300-family)
embedded in the
[Nordic nRF52840 chip](https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fcryptocell.html)
to enable hardware-accelerated cryptography. Our placeholder implementations of required
cryptography algorithms (ECDSA, ECC secp256r1, HMAC-SHA256 and AES256) in Rust are research-quality
code. They haven't been reviewed and don't provide constant-time guarantees.

## Hardware

You will need one the following supported boards:

*   [Nordic nRF52840-DK](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK)
    development kit. This board is more convenient for development and debug
    scenarios as the JTAG probe is already on the board.
*   [Nordic nRF52840 Dongle](https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF52840-Dongle)
    to have a more practical form factor.
*   [Makerdiary nRF52840-MDK USB dongle](https://wiki.makerdiary.com/nrf52840-mdk/).
*   [Feitian OpenSK dongle](https://feitiantech.github.io/OpenSK_USB/).

## Installation

To install OpenSK,
1.  follow the [general setup steps](docs/install.md),
1.  then continue with the instructions for your specific hardware:
	* [Nordic nRF52840-DK](docs/boards/nrf52840dk.md)
	* [Nordic nRF52840 Dongle](docs/boards/nrf52840_dongle.md)
	* [Makerdiary nRF52840-MDK USB dongle](docs/boards/nrf52840_mdk.md)
	* [Feitian OpenSK dongle](docs/boards/nrf52840_feitian.md)

To test whether the installation was successful, visit a
[demo website](https://webauthn.io/) and try to register and login.
Please check our [Troubleshooting and Debugging](docs/debugging.md) section if you
have problems with the installation process or during development. To find out what
else you can do with your OpenSK, see [Customization](docs/customization.md).

## Contributing

See [Contributing.md](docs/contributing.md).

## Reporting a Vulnerability

See [SECURITY.md](SECURITY.md).