[noise] New test vectors

[Alex]

On Tue, 17 May 2016 02:16:14 -0700
Trevor Perrin <trevp at trevp.net> wrote:

> > I'm working on some other vectors for Noise Pipes, namely for
> > starting communications in IK and then transitioning to
> > XXfallback.  IK and XX scenarios without fallback are already
> > covered by the current vectors.  
> 
> Mm, good thought, I wonder how we'll describe that in the format.
> 

Are the features described in the "Advanced uses" section considered
mandatory, optional, or something else?

Are they normative?

I've always considered Noise Pipes to be non-normative, which is why
I left "XXfallback" out of the pattern specification:

"pattern": "NN|KN|NK|KK|NX|KX|XN|IN|XK|IK|XX|IX|XR|N|K|X",

It's not clear to me whether the test vector format should support
non-normative optional extensions.

-- 
Alex