[noise] [Noise] Go implementation

[Jonathan Rudenberg]

On Jul 6, 2014, at 2:36 PM, Trevor Perrin <trevp at trevp.net> wrote:

> On Sun, Jul 6, 2014 at 1:12 PM, Jonathan Rudenberg
> <jonathan at titanous.com> wrote:
>> On Jul 6, 2014, at 12:45 PM, Trevor Perrin <trevp at trevp.net> wrote:
>> 
>>> The KDF logic in your deriveKey() could be clearer.
>> 
>> I refactored it a bit last night:
>> 
>> https://github.com/titanous/noise/blob/84c8891ca786088286cf2461d4237a0de5da2b9e/box/box.go#L172-L175
>> 
>> Is there anything specific that you think would make it clearer? 
> 
> Looks better, but I think the extra and info are reversed.

Thanks, fixed.

> kdf_num is not actually state or a counter, it's just so every
> different use of the KDF gives completely different results, even if
> passed the same input.  Which helps the security analysis.  I added
> more comments last night, see if that helps explain, or if there's
> something else we can do to clarify.

Okay, that makes sense. I will refactor how it is handled.

Jonathan