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Date: Tue, 02 Sep 2014 13:51:14 -0400
From: Bill Cox <waywardgeek@...hershed.org>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] A review per day - Schvrch

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On 09/02/2014 11:23 AM, Samuel Neves wrote:
> You can alternatively represent stir's inner loop as follows:
> 
> const uint64_t x = state[(j+3)%256]; const uint64_t y =
> state[(j+2)%256]; const uint64_t c = (x^((x^y)|((x-y)^y))) >> 63; 
> carry ^= state[(j+1)%256] ^ (c - 1); state[j] ^= carry; carry +=
> mixer;
> 
> This way it might be easier to see how differences propagate from
> higher bits to lower bits.
> 

OK, I believe it now.  The LSB of carry is obfuscated by the parity of
number of comparisons that pass/fail.  Adding the mixer propagates
this upward.  Not that I'm really qualified to rate such things, but
it seems to me that it will mix properly given enough iterations.

This is why I'm sticking to reviewing the code :-)

Bill
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