Test code to send an encrpyted message over ipv6. Keys are hardcoded, server listens on all ipv6 address, client will take an optional address, default connection is to "::1". Server by default listens on all ipv6 addresses.

sudo apt install libsodium-dev

cd c rm client server; gcc client.c -o client -lsodium && gcc server.c -o server -lsodium

./server ./client

Developed on nodejs 15.6.0

npm install

npm run build

npm run client npm run server

Both commands can take a a parameter to listen on or connect to.

IPV6 c code is from here: https://gist.github.com/jirihnidek/388271b57003c043d322

Node.js client/server code started from here: https://gist.github.com/sid24rane/2b10b8f4b2f814bd0851d861d3515a10 https://nodejs.org/dist/latest-v15.x/docs/api/net.html

https://doc.libsodium.org/public-key_cryptography/sealed_boxes https://github.com/dchest/tweetnacl-js/wiki/Examples