code: private static OneWayMessageDigestCodec createWellKnownInstance(String algorithm,
                                                                    String password,
                                                                    OneWayCodec codec)
    {
      try
      {
        return new OneWayMessageDigestCodec(algorithm, password, codec);
      }
      catch(NoSuchAlgorithmException e)
      {
        throw new RuntimeException(e);
      }
      catch(CloneNotSupportedException e)
      {
        throw new RuntimeException(e);
      }
    }
docs: This creates a well known instance.. the difference with the constructor
  is that all exceptions are caught and rethrown as RuntimeExcpetion
  because they should not happen.
  
  @param algorithm
  @param password
  @param codec
  @return the codec