You'll have to write some glue code, but if all you need is standard Ed25519 signatures, current-gen Yubikeys can do this. Somebody's implemented a python libra

You'll have to write some glue code, but if all you need is standard Ed25519 signatures, current-gen Yubikeys can do this. Somebody's implemented a python library that does that here https://github.com/tschudin/sc25519 https://github.com/tschudin/sc25519