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There already is a gpg Api - gpg me (made easy):

It would probably make sense to implement and expose that?

No, this is not a very good suggestion. gpg-me just wraps the gpg binary and relies on a lot of global state, environmental variables for example.

This makes the library really painful to use in multithreaded contexts, or when you need to have a controlled env. (like unit tests).

I use gpg-me in one of my projects, and it's very far from pleasant to use.