A while ago I wrote about the alternatives to JWT tokens. One of the them was Branca. It’s a base62-encoded, XChaCha20-Poly1305 encrypted token with an abritrary payload. Before writing the post, I thought out it would be nice to have a Branca library for Clojure and that’s something I’ve occassionally worked on since then. First I wrote base62 encoder and decoder and published them as a tiny library called clj-base62. That was easy enough. Then I needed to implement the encryption part...
