Hi, I'm working on a weather sensor project that uses rp2w devices to collect data and send it to a cloud hosted database. The server requires JWT authentication with RSA signed keys. The Python implementation of RSA I found here was too slow and was affecting data transfer timing, so I wrote a user module that's a tiny wrapper around mbedtls and exposes a general RSA signing function. The speedup is dramatic.

I thought it would be a good thing to contribute back to micropython as a core module. Other common cryptographic functions could be added. I'm aware of ucrypto but mbedtls is afaik is highly used and battle tested, and is included in micropython already.

My module code is here: https://github.com/czcollier/micropython-fastrsa/tree/main

Looking for some perspective on whether it's worth doing some cleanup, documentation and submitting a PR. Thanks!