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Message-ID: <20111222173753.GA16578@openwall.com>
Date: Thu, 22 Dec 2011 21:37:53 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: Bit slice implementation of DES based hashes
On Thu, Dec 22, 2011 at 10:50:20PM +0530, piyush mittal wrote:
> According to the paper what I understood is as follows but it can be wrong
> as well..
>
> 0th bit of block will go to the 0th bit of word.
> 0th bit of key will go to 0th bit of word.
> 11th bit of block will go to the 0th bit of 11th word
> 11th bit of key will go to the 0th bit of 11th word.
...
> 0th bit of 2nd block will go to the 2nd bit of first word
> 0th bit of 2nd key will go to the 2nd bit of first word.
> 11th bit of 2nd block will go to the 2nd bit of 11th word
> 11th bit of 2nd key will go to the 2nd bit of 11th word
OK, this is mostly right (except for the minor issue with 0-based vs.
1-based numbering in these examples).
Given this understanding, do you see why your piece of code where you
were putting entire octets from plain_salt_mix[] into elements of B[]
was obviously wrong?
Also, do you understand why the get_hash() functions process a few
initial elements of B[] only?
Alexander
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