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Message-ID: <CA+TsHUBtQ7foOLj3WtN7kOYdrorOJMWcvbRdwzJnnUqyP1niwA@mail.gmail.com>
Date: Tue, 5 Jun 2012 14:14:11 +0530
From: SAYANTAN DATTA <std2048@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: GPU formats vs Test Suite
On Tue, Jun 5, 2012 at 12:00 PM, magnum <john.magnum@...hmail.com> wrote:
> On 06/05/2012 08:24 AM, magnum wrote:
>
>> On 06/05/2012 08:07 AM, SAYANTAN DATTA wrote:
>>
>>> I found that the output of openssl version of pbkdf2 in mscash2(cpu
>>> version) do not matches with the SSE version of pbkdf2 for salts greater
>>> than 19 charachters. Since mscash2-opencl is based on openssl version of
>>> pbkdf2, so I have limited the max salt length to 19 charcters only.
>>> But the
>>> file /test/MSCash2_tst.in contains salts upto 22 character. I think
>>> this is
>>> the main source of problem.
>>>
>>
>> How come not a single password is cracked then? A smashed buffer? It
>> should crack all passwords with <= 19 character salts.
>>
>
> BTW you only *have* to fix the buffer smashing (if that is what happens),
> not necessarily bump the max supported length (although that won't hurt).
> If you fix it and it ends up cracking 1411 out of 1500 hashes, we'll just
> instruct the Test Suite that 1411 is a success.
>
> magnum
>
>
Hi magnum,
So I increased the MAX_SALT_LENGTH to 23 to avoid buffer overrun and also
decreased PLAINTEXT_LENGTH to 31. Now it is guessing 1410 passwords. other
90 passwords can't be cracked by my due to the salt length issue.
Any reason why reducing the PLAINTEXT_LENGTH increses guessing?? Previously
it was set to 40.
$./jtrts.pl -noprelim mscash2-opencl
-------------------------------------------------------------------------------
- JtR-TestSuite (jtrts). Version 1.12.2, June 3, 2012. By, Jim Fougeron &
others
- Testing: John the Ripper password cracker, ver: 1.7.9-jumbo-5+unstable
[linux-x86-opencl]
--------------------------------------------------------------------------------
John Jumbo build detected.
form=mscash2-opencl guesses: 1410 time: 0:00:00:14 : Expected
count(s) (1500) [!!!FAILED!!!]
.pot CHK:mscash2-opencl guesses: 1410 time: 0:00:00:14 [PASSED]
Some tests had Errors. Performed 1 tests.1 errors
Time used was 94 seconds
Regards,
Sayantan
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