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Date: Wed, 30 Oct 2013 15:50:06 +0100
From: Katja Malvoni <>
Subject: Re: ZedBoard: bcrypt

On Wed, Oct 30, 2013 at 2:07 PM, Katja Malvoni <> wrote:

> On Wed, Oct 30, 2013 at 10:17 AM, Solar Designer <>wrote:
>> If so, does anything prevent you from optimizing this to? -
>> Cycle 0: compute new R; swap L and R; initiate 4 S-box lookups
>> Cycle 1: wait
>> ... except possibly for the special cases of the first and the last
>> round?  In the first round, bypass some of the logic.  After the last
>> round, invoke the same logic, but bypass the S-box lookups.
> As far as I can tell nothing prevents me to do that, I'm on it now.

Actually I can't do that - I need L to know which element from S-box to
fetch and I have to compute it one cycle before initiating S-box lookups.


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