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Date: Fri, 28 Mar 2014 20:11:26 +0000
From: "Joe ." <dy3afg9@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: Re: Re: Re: pbkdf2-hmac-sha512 on GPU
Hi Lukas,
Did you get a chance to take a look?
Also, if you find it helpful I could provide test hashes with known
passwords to troubleshoot.
Thanks,
Joe.
On Mon, Mar 17, 2014 at 9:34 PM, Joe . <dy3afg9@...il.com> wrote:
> Thanks Lukas,
>
> My salt is 64 characters long, and the hash 256.
> However, when using ml2john.py it cuts the hash to 128. I assume this is
> deliberate... due to impossible hash collisions? (It's no faster like this,
> but it gives me a different error)
> With my hash cut down to 128, I get the error "Assertion failed:
> (strlen(c) == 128)" as before with the shorter hash/salt I found in that
> file.
>
> GPUs:
> 2x D300 (it's a new Mac Pro)
>
> This is the output from --list=opencl-devices (minus the CPU and one GPU,
> as they are both the same)
>
> Device #1 (1) name: AMD Radeon HD - FirePro D300 Compute Engine
> Device vendor: AMD
> Device type: GPU (LE)
> Device version: OpenCL 1.2
> Driver version: 1.2 (Jan 28 2014 20:11:48)
> Native vector widths: char 4, short 2, int 1, long 1
> Preferred vector width: char 4, short 2, int 1, long 1
> Global Memory: 2.0 GB
> Local Memory: 32.0 KB (Local)
> Max memory alloc. size: 512.5 MB
> Max clock (MHz): 850
> Profiling timer res.: 37 ns
> Max Work Group Size: 256
> Parallel compute cores: 20
> Stream processors: 1280 (20 x 64)
>
> I would run ubuntu from a live disk for testing out, but I don't think
> that's possible with Macs like with PCs.
>
> Thanks,
> Joe.
>
>
>
>
>
>
>
> On Mon, Mar 17, 2014 at 1:23 AM, Lukas Odzioba <lukas.odzioba@...il.com>wrote:
>
>> 2014-03-16 0:19 GMT+01:00 Joe . <dy3afg9@...il.com>:
>> > Thanks, I'm able to build it successfully now with line number 68
>> looking
>> > like this.
>> > /* #define DEBUG */
>>
>> Ok.
>>
>> > my /path/to/hash.txt is formatted like this:
>> > grub.pbkdf2.sha512.iterations.salt.hash (where 'iterations' is ~40,000)
>> >
>> > However, when I run:
>> > ./john --format=grub-opencl /path/to/hash.txt
>> > It gives me this error:
>> > Assertion failed: (strlen(c) == 128), function binary, file
>> > opencl_pbkdf2_hmac_sha512_fmt.c, line 184.
>> > Abort trap: 6
>> >
>> > From what I can understand above, 'strlen' looks like 'string length',
>> > perhaps this is the fault as my salt+hash is quite long at 320
>> characters?
>> > Just a guess.
>>
>> Yes that's the issue. That's why this format is called grub-opencl
>> instead of more generic pbkdf2-sha512-opencl.
>> If you can tell me exact lengths of your hash and salt I'll see what I
>> can do with it.
>>
>> > When I run it against one of the tests I found in the file
>> > opencl_pbkdf2_hmac_sha512_fmt.c (the first one of line 63) and copy it
>> to a
>> > .txt file, I get this:
>> > Loaded 1 password hash (grub-opencl, grub-opencl [PBKDF2-SHA512])
>> > Self test failed (get_hash[0](0))
>> >
>> > When I try a test:
>> > ./john --format=grub-opencl --test
>> > I get:
>> > Benchmarking: grub-opencl, grub-opencl [PBKDF2-SHA512]... FAILED
>> > (get_hash[0](0))
>>
>> That's a bit more problematic, what gpu do you have?
>> Can you try to test it under some linux distribution?
>>
>> Lukas
>>
>
>
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