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Date: Fri, 16 Dec 2011 18:46:55 +0530
From: piyush mittal <piyush.cse29@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Bit slice implementation of DES based hashes

Hi,

Is there any specific requirement of using uni-codes in oracle.Can i
implement it without using uni-codes same as of LM.

On Thu, Dec 15, 2011 at 9:34 PM, piyush mittal <piyush.cse29@...il.com>wrote:

> You need to introduce a fourth function.  I suggest that you take
>> DES_bs_crypt_LM(), copy it to a new function, and remove the
>> initialization of B from there (let the caller specify the initial B).
>> This way, you get a function implementing one DES block encryption
>> (for DES_BS_DEPTH different blocks and/or keys in parallel).  As to
>> block cipher modes, you'll implement those externally to that function
>> (at least initially).
>>
>
>
> So you mean to say I use same mode as of LM for Oracle i.e same function
> DES_bs_crypt_LM() accept name change and should not initialise
> DES_bs_set_block_8().
>
> Thanks,
> On Thu, Dec 15, 2011 at 8:36 PM, Solar Designer <solar@...nwall.com>wrote:
>
>> Piyush -
>>
>> On Thu, Dec 15, 2011 at 05:51:14PM +0530, piyush mittal wrote:
>> > In File DES_bs_b.c Three methods are given i.e
>> > 1,DES_bs_crypt_LM()
>> > 2.DES_bs_crypt_25
>> > 3.DES_bs_crypt()
>> >
>> >
>> >
>> > The first two is specific to Lm and Traditional DES respectively.First
>> one
>> > calls the S-boxes in ECB mode and for second one I don't
>> > know.Third one i hope don't use any mode.However in oracle_fmt_plug.c
>> > conversion we need CBC mode so how to call S Boxes in this case?
>>
>> You need to introduce a fourth function.  I suggest that you take
>> DES_bs_crypt_LM(), copy it to a new function, and remove the
>> initialization of B from there (let the caller specify the initial B).
>> This way, you get a function implementing one DES block encryption
>> (for DES_BS_DEPTH different blocks and/or keys in parallel).  As to
>> block cipher modes, you'll implement those externally to that function
>> (at least initially).
>>
>> Another question I expected from you was how to set arbitrary DES keys
>> when the current DES_bs_set_key*() functions accept ASCII strings only.
>> I'll answer this one without waiting for you to ask it. ;-)  I suggest
>> that you simply use DES_bs_set_key() for now, but set bit 8 in every
>> char (OR it with 0x80) to ensure that all 8 chars (with 7 significant
>> bits per char) are processed.  We may introduce a more efficient binary
>> key setup function later.
>>
>> Thanks,
>>
>> Alexander
>>
>
>
>
> --
> Piyush Mittal
>
> Department of Computer Science and Engineering
> National Institute of Technology,Rourkela
> INDIA
>
>
>


-- 
Piyush Mittal
Department of Computer Science and Engineering
National Institute of Technology,Rourkela
INDIA

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