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Date: Wed, 10 Jul 2013 14:09:06 +0200
From: marcus.desto <marcus.desto@...pl>
To: john-dev@...ts.openwall.com
Subject: Re: PBKDF2 hash_out treatment

Hello magnum,


Dnia 10 lipca 2013 13:31 magnum <john.magnum@...hmail.com> napisaƂ(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
View attachment "shorty.py" of type "text/x-python" (2525 bytes)

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