Crypto Chat

A very simple client-server application for sending signed messages between browsers using Web Crypto and WebSockets.

Why?

I wanted to poke at Web Crypto and do something with it.

It looks good, but I'm not a cryptography expert, so probably not.

Make sure you have Go 1.18+ installed.

To build and start the server:

go build -o server ./cmd/server
./server

No additional setup necessary, but there are some possible issues you might encounter:

Because this uses Web Crypto, in order to make this page functional, you need to have TLS working on non-localhost origins. This server doesn't support TLS, so you'll need to have a reverse-proxy that provides TLS. (that'll also require updating the frontend to use wss:// instead of ws:// protocol for WebSocket communication)
There's no way to export/import keys. If you refresh the page, the keys and message history are lost.
There's no way change listen address or port without modifying code, so you either have to accept that it runs on 0.0.0.0:8080 or change the code.
It's inconvenient and extremely basic.