Re: [Khufu] Pre-Computing the S-Boxes and obtaining aux. keys
From: Matt (matt_crypto_at_yahoo.co.uk)
Date: 11/01/04
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Date: 1 Nov 2004 04:52:14 -0800
Nikola Skoric <nick-news@net4u.hr> wrote:
>
> So, the point is this guy was in the same position as I am. He has the
> algorithm, but he did some quick hacks to get around the fact he hasn't
> any clue how to generate auxiliary keys and S-Boxes. The algorithm
> itself is well explained in the Merkle's paper and to be honest I didn't
> even bother to understand the C code in that file except to ensure that
> the function initialize() (which builds the aux key material and the
> boxes) is just an ugly hack.
>
> Now, I might be missing something obvious... in that case, I BEG you to
> point me in the right direction becouse I'm facing a solid brick wall
> here...
Try the following address:
Then click on "Images", and browse the document (it's a series of TIFF
images, you might need special graphics software to view them).
Eventually you get to C source code, including some which generates
the S-box from the RAND numbers. And, moreover, some test vectors,
which are quite useful for testing your own implementation. Hope that
helps somewhat. If you manage to get a working Khufu implementation,
I'd encourage you to release the source code on the Internet,
-- Matt
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