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Date: Sun, 20 Jul 2014 06:48:57 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: ZedBoard: bcrypt

Katja,

On Sun, Jul 20, 2014 at 05:12:10AM +0400, Solar Designer wrote:
> On Sat, Jul 19, 2014 at 07:10:09PM +0200, Katja Malvoni wrote:
> > While testing with
> > cost 12, the zed system rebooted. I guess it's overheating since you modded
> > the board so it shouldn't be voltage drop problem.
> 
> Yes, as I mentioned to you via private e-mail, in the current plastic
> box the board overheats when Zynq PL is in full use for more than a
> couple of minutes.  I'll look into adding a fan (perhaps 40mm, like old
> graphics cards had).

I've just added a 40mm 12V 0.08A fan connected at 5V.  I tried several
of these 40mm 12V fans, and chose one that most reliably spins up at 5V.
I think when connected like this it consumes under 0.5W (maybe 0.3W).

Compared to Zynq's heatsink, this fan looks huge. ;-)  It covers an area
about 3x bigger than the heatsink.

I don't know where your latest code is, so I've used the older 112
instances code with 64 same-salt cost 12 bcrypt hashes.  This test
passed with the board already in the plastic box:

root@...aro-ubuntu-desktop:~/k3/JtR_112# cat bcrypt_112cores_5brams.bit.bin > /dev/xdevcfg 

root@...aro-ubuntu-desktop:~/k3/JtR_112/JohnTheRipper/run# ./john -i=digits4 ~solar/pw-bcrypt-12-64 
Loaded 64 password hashes with no different salts (bcrypt [Blowfish 32/32])
Press 'q' or Ctrl-C to abort, almost any other key for status
1                (?)
12               (?)
[...]
46               (?)
47               (?)
64g 0:00:02:46 0.3848g/s 64.65p/s 64.65c/s 2477C/s 282..275
Use the "--show" option to display all of the cracked passwords reliably
Session completed

Alexander

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