[noise] Go implementation

[Jonathan Rudenberg]

> On Nov 16, 2015, at 11:38 AM, Jonathan Rudenberg <jonathan at titanous.com> wrote:
> 
> 
>> On Nov 16, 2015, at 3:22 AM, Trevor Perrin <trevp at trevp.net> wrote:
>> 
>> On Sun, Nov 15, 2015 at 2:20 PM, Jonathan Rudenberg
>> <jonathan at titanous.com> wrote:
>>> 
>>> PSK implementation is working: https://github.com/titanous/noise/compare/psk
>> 
>> Looks great in general, but I think the PSK needs tweaking for the
>> MixPresharedKey() step.
>> 
>> https://github.com/trevp/noise/blob/psk2/noise.md
> 
> Done! And the vectors from screech match.

I retract my previous statement, it looks like screech is using Noise_* instead of NoisePSK_* for the handshake name when a PSK is specified.

Jonathan