> I'm 100% certain that you also can do that with raw java.security.

I tried that, the problem is Meshcore specific - they do their own weird shit with private and public keys [1]. Haven't figured out how to do the private key import either, because in the C source code (or in python re-implementations) Meshcore just calls directly into the raw ed25519 library to do their custom math... it's a mess.

[1] https://jacksbrain.com/2026/01/a-hitchhiker-s-guide-to-meshc...

I'm playing with LORA/Meshcore right now (I have an nRF52840 lying around). I'm pretty sure I know how to do that, will take a look.