Diego Gurpegui on Nostr: Thanks, but I'm looking for something like a multi-tool app. OpenKeychain is specific ...

Thanks, but I'm looking for something like a multi-tool app. OpenKeychain is specific to PGP.
Something like this:
https://play.google.com/store/apps/details?id=com.nitramite.cryptography
or this:
https://play.google.com/store/apps/details?id=com.kokoschka.michael.crypto

But none of those are really open source AFAICT