Support age-plugin-yubikey

[tionis]

Support age-plugin-yubikey to store keys on yubikeys and query them over NFC.
@FiloSottile mentioned he might be able to help with the specification: https://news.ycombinator.com/item?id=34160527

[msfjarvis]

I'm not aware of anything different that the library needs to do for supporting plugins, isn't this handled by a CLI or GUI frontend which will lookup the binary implementing the plugin and handle executing it to retrieve key material?

[tionis]

Here are some notes on the plugin spec: https://hackmd.io/@str4d/age-plugin-spec
As far as I understand you're right in principle, but for integration into Android there should probably native Kotlin support, right?