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Date: Sun, 19 Aug 2012 19:52:19 +0530
From: Sayantan Datta <>
Subject: Re: bitslice DES on GPU

Hi Alexander,

On Fri, Aug 17, 2012 at 12:03 PM, Solar Designer <> wrote:

> > but I'm kind of stuck with that
> > too. I have declared an array of DES_bs_all[] and also made some of the
> > necessary adjustments but certainly not all. I guess each instance of
> > DES_bs_combined is used for 32 hashes given that I set DES_BS_DEPTH=32. I
> > have also set the MAX_KEYS_PER_CRYPT to a multiple of 32.
> This sounds correct to me.

I've made some progress with DES BS using the above mentioned
implementation. The cpu simulation with KPC set to multiples 32 runs fine.
Now its time to port things to openCL. I have a few more questions:

1.Is it necessary to port DES_bs_set_salt() to gpu?
2. The DES_bs_crypt_25 function has too much branching in it. Is it
possible to reduce the number of branching in DES_bs_crypt_25() function?

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