john-users - Re: Assembly files

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Message-ID: <4487C6CD.9080207@t2.technion.ac.il>
Date: Thu, 08 Jun 2006 08:42:21 +0200
From: Ami Schwartzman <samis@...technion.ac.il>
To: john-users@...ts.openwall.com
Subject: Re: Assembly files

ByteRage wrote:

> --- David Luyer <david@...er.net> wrote:
>
>   
>> On 7/6/06 3:01 PM, "David Luyer" <david@...er.net>
>> wrote:
>>
>>     
>>> On 7/6/06 3:45 PM, "Ami Schwartzman"
>>>       
>> <samis@...technion.ac.il> wrote:
>>     
>>>> Hi
>>>>
>>>>
>>>> Me and my friend are in the process of migrating
>>>>         
>> John to Visual C++.  We
>>     
>>>> have successfully migrated all files (based on
>>>>         
>> MinGW jumbo patch) and
>>     
>>>> have only the two assembly files x86.S and
>>>>         
>> x86-mmx.S (later on sse) left.
>>     
>>>> Now, these files are written for the GNU
>>>>         
>> assembler (in AT&T syntax and
>>     
>>>> also needs to be preprocessed).  Is there a
>>>>         
>> version for MASM or
>>     
>>>> something in Intel syntax out there?
>>>>         
>
> Something that might work is assembling with gnu
> assembler and then disassembling the generated code
> with the deadlister program IDA, which can produce
> Intel syntax code that you can copy & paste into a
> text file which tends to assemble with minor adaptions
> in NASM... Assembling it with MASM may be a bit more
> tricky but I'm sure it's all doable :)
> I have been succesful reverse engineering blocks of
> cryptographic code from binaries before with this
> approach, integrating them in projects while skipping
> the necessity of identification/modification of the
> blocks of cryptographic code themselves at an early
> point in the reverse engineering proces.
>
> cheers,
>
> Joachim De Zutter
>
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>   
That's a good idea.  I'll try that.

Thanks

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