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Message-ID: <1dfea37c.742f34d1.51dd513f.c695f@o2.pl>
Date: Wed, 10 Jul 2013 14:19:11 +0200
From: marcus.desto <marcus.desto@...pl>
To: john-dev@...ts.openwall.com
Subject: Re: PBKDF2 hash_out treatment
magnum,
I think I have found the problem.
It is the salt size. My reference input contained a salt with size 32. As I switched to 4 (your test input), the opencl implementation worked well with pyopencl.
Now. I tried different lengths of salt. Finally, I can confirm, that pbkdf2_hmac_sha1_unsplit_kernel.cl produces wrong hashes since length of the input salt string is >23.
I would like to mention that I did not convert the input strings to UTF-8.
In pbkdf2_hmac_sha1_unsplit_kernel.cl I set
#define KEYLEN 20
#define OUTLEN 87
#define SALTLEN 32
Remaining pbkdf2_hmac_sha1_unsplit_kernel.cl has not been modified, except
inline void pbkdf2(__global const uchar * pass, uint passlen,
__global const uchar * salt, uint saltlen, uint iterations,
__global uint * out, uint outlen)
into:
__kernel void pbkdf2(__global const uchar * pass, uint passlen,
__global const uchar * salt, uint saltlen, uint iterations,
__global uint * out, uint outlen)
because I am accessing the data not using struct.
Regards,
Marcus
Dnia 10 lipca 2013 14:09 marcus.desto <marcus.desto@...pl> napisał(a):
> Hello magnum,
>
>
> Dnia 10 lipca 2013 13:31 magnum <john.magnum@...hmail.com> napisał(a):
>
> > On 10 Jul, 2013, at 12:21 , marcus.desto <marcus.desto@...pl> wrote:
> > > Hi Alexander,
> >
> > That's not me :-) My name is magnum (and only that - the "john" in my email address just refers to JtR).
> >
>
> Oh, right. I am sorry. Solar is Alexander.
>
> > OK. I think pbkdf2_hmac_sha1_unsplit_kernel.cl is better for your intentions and I'm pretty sure it does support running just one iteration. I also think it will return a normal byte sequence and it should be trivial to unpack it to a standard hex string.
>
> Yeah.
>
> >
> > Here's a test vector for pbkdf2-hmac-sha1 at one iteration:
> >
> > Input:
> > P = "password" (8 octets)
> > S = "salt" (4 octets)
> > c = 1
> > dkLen = 20
> >
> > Output:
> > DK = 0c 60 c8 0f 96 1f 0e 71
> > f3 a9 b5 24 af 60 12 06
> > 2f e0 37 a6 (20 octets)
> >
> > I take it your intention is to get that as a hex string of "0c60c80f961f0e71f3a9b524af6012062fe037a6", right?
>
> Yes.
>
> >
> > Please post a complete python program, as short/clean as possible, that just calculates this hard-coded test vector and prints the output, first using some prefab Python CPU function, and then (trying to) using pbkdf2_hmac_sha1_unsplit_kernel.cl. I'm sure we can help you get it straight from there.
> >
> > magnum
> >
>
> Alright, thanks. Please, refer to the attachment.
>
> Marcus
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