Herewith pointers to Java 15 and Go code that converts Ed25119 public keys back and forth between short text strings and key objects you can use to verify signatures. The code isn’t big or complicated, but it took me quite a bit of work and time to figure out, and led down surprisingly dusty and ancient pathways. Posted to help others who need to do this and perhaps provide mild entertainment.
[Update 04/23: “agwa” over at YCombinator showed how to simplify the Go with x509.MarshalPKIXPublicKey and x509.ParsePKIXPublicKey.]...