Date: Thu, 19 Jul 2012 21:34:05 +0530 From: Dhiru Kholia <dhiru.kholia@...il.com> To: john-dev@...ts.openwall.com Subject: Re: fast pbkdf2-sha1 OpenCL kernel On Thu, Jul 19, 2012 at 9:08 PM, Lukas Odzioba <lukas.odzioba@...il.com> wrote: > 2012/7/19 Dhiru Kholia <dhiru.kholia@...il.com>: >> 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 > wpapsk. To accelerate zip and ODF formats, a more general PBKDF2-SHA1 kernel is needed (passwords of length 20, salt size 20 and output length 66). Your code also works on CPU with no problems. Hence I picked your code to start with and will stick with it. It can be made faster later on. It is already 5x faster than my kernel! Start already ;) -- Cheers, Dhiru
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