Support EC certificates for sealing?

I generated EC certificates instead of RSA, but kubeseal won't work with them, and I suppose the controller wouldn't either. Any reason why it's RSA only? And could it support EC certificates?

Start by tracing how kubeseal generates and consumes certificates, then compare that path with the sealed-secrets controller mentioned in the issue. Determine the certificate assumptions that currently require RSA and define completion as EC certificates working for both sealing and controller processing, with coverage for the relevant certificate types.

Written by the indexing model from the issue text.