Over the last months we’ve worked on adding support for OpenPGP card hardware tokens to Sequoia. OpenPGP cards (like the free Gnuk implementation, or e.g. Nitrokey and YubiKey devices) are great when you want to use an OpenPGP key, but don’t want the private key material stored on your computer. Advanced OpenPGP users have come to expect their software to support them.
Earlier this month, we connected a set of physical cards to our continuous integration (CI) machine and configured a job to run a test suite on these cards. This setup ensures that every change to our code is tested on a set of physical OpenPGP cards. The ability to test against multiple cards is essential, as cards implement different versions of the specification, and, on top of that, many have various quirks.