john-dev - Re: Bit slice implementation of DES based hashes

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Date: Sat, 4 Feb 2012 20:56:44 +0530
From: Piyush Mittal <piyush.cse29@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Bit slice implementation of DES based hashes

Hi,

I just took a look at the code.  It turns out that you haven't moved to
> 1.7.9+ yet, although I thought you said you did
>

Moving to 1.7.9 is not a big issue that I can move later easily.

although the key string is probably wrong (I see that you have the one we
> discussed commented out, so perhaps
>

Sorry the correct key I commented out i.e
key="\x80\x11\x22\x33\x44\x55\x66\x77"

It looks like initially your goal was to get things working for just one
bit layer - correct?

Yes you are right.

And you haven't completed that implementation yet -
> correct?  What/how are you testing, then?
>

Whole implementation is almost on my hand. According to oracle hashes we
need to apply DES encryption two times so it will be more appropriate if I
check result of first encryption if it is coming right or not? and for the
same I am checking result of first encryption as follows in function
DES_bs_get_hash():

     for(i=0;i<64;i++)
            ((b[i] START >> index) & 1);

and also applying final permutation on it. (Please don't consider commented
part that I sent to you)

Are you only testing the "Key values.." printout from DES_bs_crypt_Oracle()?
>

Yes that is what I want first because I am not getting correct sequence of
768 bits (you also please don't consider other things now). And in order to
check these round key values I have taken an example from Behrouz A.
Forouzan. The key that I am using after parity drop according to the given
example is as follows:

   key="\xAB\x74\x20\xC2\x66\xF3\x6E";

You can see this example from the links given below:

https://picasaweb.google.com/104472102705685602064/February42012#5705299936162326818
https://picasaweb.google.com/104472102705685602064/February42012#5705300078962977538

But I am not getting the exact sequence of round keys as given in this
example. Please see to this matter.

Thanks

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