[lambdafu]

NeoPG uses Botan, which is a crypto library written in C++. I recommend reading its source code and comparing it with, for example, libgcrypt.

[adultSwim]

Is most of the removed code functionality that is now in the crypto library used, Botan?

A blog post on the decision to use an external library might be good. Is there a reason to think that the library will be better maintained than code with similar functionality in GPG?

Great work by the way! Thank you!