OpenSSH's ssh-keygen has an implementation of the
[http://bohwaz.net/archives/web/Bubble_Babble.html](bubble babble)
encoding for key fingerprints. This is a little wrapper around that
function so you can encode anything to bubble babble.
Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Copyright (c) 2008 Alexander von Gernler. All rights reserved.
Copyright (c) 2010,2011 Damien Miller. All rights reserved.