The easier and more productive thing is to make an easy-to-use tool that does a specific workflow vs trying to be a swiss army knife.

https://github.com/FiloSottile/age is this for encrypting files.

https://en.wikipedia.org/wiki/Signify_(OpenBSD) and https://jedisct1.github.io/minisign/ are this for signing files.

Signal/Whatsapp/etc that use the Signal Protocal are this for messaging.

It turns out solving one problem at a time and ending up with a bunch of purpose-built tools is way easier to get right than trying to jam an entire toolbox into one thing.