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Date: Thu, 19 Jul 2012 17:38:23 +0200
From: Lukas Odzioba <>
Subject: Re: fast pbkdf2-sha1 OpenCL kernel

2012/7/19 Dhiru Kholia <>:
> Hi,
> I am looking for a fast pbkdf2-sha1 OpenCL kernel which can handle
> passwords of length 20, salt size 20 and can output key length of 66.
> 1) Can the wpa-psk kernel work with password size of 20? If not, can
> it be modified to do the same? I need this for ODF kernel.
> 2) Currently the output of wpa-psk kernel is 32 bytes, can this be
> increased to 64 + 2 (= 66)? I need this for ZIP AES kernel.
> Jim, does you pbkdf2 kernel meet these requirements? Can it be
> modified to do so?
> I have written a pbkdf2 kernel which meet all these requirements but
> it is 5x slower than Lukas's code on CPU and on GPU it is unusable
> (super super slow).

I can prepare for you kernel meeting that requirements, however for
OpenCL i suppose that Sayantan's code is faster.
Make a decision which kernel you want to use, and let me know then I
can start working on more general PBKDF2-SHA1 kernel than this in


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