SFrame

This repository contains an implementation of the draft SFrame standard for end-to-end media encryption. Since the spec is still in progress, the implementation here doesn't match exactly. For example:

We do not derive key/salt from the master key. The key is used directly, and the nonce is formed directly from the counter, with no salt.
We use AES-GCM instead of the AES-CTR + HMAC construction in the specification.
We include the SFrame header as AAD in the encryption

Ideally, these differences will resolve as the specification and this implementaiton evolve together.

Building and Running Tests

A convenience Makefile is included to avoid the need to remember a bunch of CMake parameters.

> make        # Builds the library
> make test   # Builds and runs tests
> make format # Runs clang-format over the source

Prerequisites

You need openssl 1.1 or greater installed, C++ compiler, make, and cmake