I just noticed that the openssh version that came with 1.1.9.28 does not support ed25519. I actually had nieldk's version installed but now it's gone and I can't install it again from openrepos (libssl.so.1.0.0 missing).

Is this an openrepos fvck up or a sailfish one?
I don't think I can quite understand the package management here (rpm, pkcon, etc.) I would have expected it can resolve dependencies..

Can anyone give a hint here?

OK: I installed zypper and did "zypper dup". It's upgrading openssh and downgrading openssl (as well as deleting upower?). Keeping my fingers crossed..