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Date: Wed, 29 Jul 2015 01:02:54 +0200
From: magnum <>
Subject: Re: unable to extract hash from 7z archive

I was actually pretty tempted to implement the missing stuff already. My 
plan would be to start with 7z2hashcat output and just add whatever is 
missing in the format. Don't hold your breath, it wont happen tomorrow. 
Maybe within weeks.

Sometimes these things turn out to be ridicuosly simple once you get 
around it. I'm not sure this is the case here but it may very well be. 
Since 7z is open source, there are virtually no question marks involved.


On 2015-07-29 00:32, Matthew Smith wrote:
> Oh, I am using GPU.  I am running a small mask set on my GTX 880M(which
> likes to overheat so I can't do much) and I have two EC2 G2.2xlarge with
> one graphics card each for about 22 cents an hour.  I am running hashcat on
> the GPUs but it would be nice to split the workload and use the CPUs as
> well.  That's why I was hoping you could recommend come CPU based software
> for linux that supports my hash.  I can't find anything.  The CPU version
> of Hashcat doesn't support my hash, JTR doesn't, rarcrack won't resume from
> shutdown, nothing else I saw would do what I need.
> Thank you though.  If you think of anything please let me know.
> On Tue, Jul 28, 2015 at 3:42 PM, magnum <> wrote:
>> On 2015-07-28 23:13, Matthew Smith wrote:
>>> I don't think I encrypted file names, so when I run the ""
>>> script, I get this message:
>>> file.7z : 7-Zip files without header encryption are *not* supported yet!
>>>   From googling, I see threads where an author mentions adding it in the
>>> future, but on github the file hasn't been updated in over two years.
>>> I've
>>> tried searching for a later version but I can't find it.
>> Unfortunately we haven't implemented it yet. I was hoping the missing
>> functionality was just within the conversion tool.
>>   I've used "" to get the hash, but when trying that hash file
>>> in john it doesn't seem to want to load.  Maybe I am doing something wrong
>>> in the commands?
>>> C:\johnomp\run>john --format=7z outfile.hashes
>>> No password hashes loaded (see FAQ)
>> I suppose this settles that oclHashcat can crack your hash (provided you
>> have a GPU) but we can't. Well it was worth a try.
>> BTW you probably need a GPU anyway - 7z hashes are very hard to crack. So
>> maybe buy a cheap-ish GPU and try oclHashcat?
>> magnum

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