title: Base-36 representation of Digest
body: <p>I would like to be able to take an arbitrary string, run it through a hashing function (like MD5), and then interpret the resulting digest in base-36.</p>
  
  <p>I know there already exists a Digest library in Ruby, but as far as I can tell I can't get at the raw bytes of a digest; the <code>to_s</code> function is mapped to <code>hexdigest</code>, which is, of course, base-16.</p>