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Date: Fri, 12 Jul 2013 17:53:11 +0200
From: Katja Malvoni <>
Subject: Re: Parallella: bcrypt

Hi Alexander,

I locked up 2nd board while experimenting with assembly implementation of
BF_ROUND. I'm not sure how that happened - the only change I made to code
that was running but didn't produce result (it stuck somewhere but didn't
lock up the board) was putting constants (offsets of S-box to pointer to
BF_ctx structure) in registers. I used only caller saved registers (r16-r27
and r12), iadd instead of add and just followed C code and compiler
generated assembly code and wrote BF_ROUND from scratch just to make it
work. My guess is that I wasn't loading values from S-box but from
somewhere else. I'm sorry and I'll be more careful with future tests.


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