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Date: Sat, 13 Oct 2018 15:29:08 +0200
From: Solar Designer <>
Cc: Denis Burykin <>
Subject: Re: sha512crypt & Drupal 7+ password cracking on FPGA

On Mon, Jul 23, 2018 at 05:27:51PM +0200, Solar Designer wrote:
> Per Xilinx tools, this design was supposed to work at 225 MHz.
> Unfortunately, in our testing it only works at this frequency with very
> few units built into the bitstream.  We don't know exactly why (maybe
> it's the power draw).  With 10 units, the design works reliably for us
> at 135 MHz on many boards tested, so that's what we set as the current
> default.  It also sometimes works at higher frequencies such as 160 MHz,
> but other times not.  This is configurable in john.conf.

Denis has now backported some improvements from his md5crypt+phpass
design into this older sha512crypt+Drupal7 design, which let us increase
the default frequency for sha512crypt and Drupal7 from 135 to 160 MHz.
Some lucky boards also work at 170 MHz now.


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