I'm surprised that there is no up-to-date #Java / #Kotlin library for using #OpenPGP Smart Cards.
Oh well, I spent the last month or so writing a Kotlin library using javax.smartcardio (loosely coupled) implementing the useful parts of the OpenPGP Smart Card spec 3.4.1.
It still needs more effort cleaning up, but will eventually come in handy augmenting my current work implementing OpenPGP Smart Card support for #BouncyCastle.