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Date: Mon, 2 Jul 2012 21:36:45 +0200
From: Frank Dittrich <frank_dittrich@...mail.com>
To: john-dev@...ts.openwall.com
Subject: Re: I think I got it
On 07/02/2012 07:41 PM, jfoug wrote:
>> From: Frank Dittrich [mailto:frank_dittrich@...mail.com]
>> Format label dynamic
>> Max. password length in bytes 82
>
> I will have to check for sure, but DUE to this being generic, I did make it so it would work with longer PW's. The format itself, should set the max password length IT wants. Each sub format will or should know how many bytes are valid. SSE builds vs non-SSE builds do (or can) change this.
>
> It appears that this format (dyna 2) is busted, as likely are others. I will correct this. Dyna2 in SSE (mmx) builds should truncate any password longer than 55 bytes to only be 55 bytes long.
>
>
>> Min. keys per crypt 1
>> Max. keys per crypt 128
>> Flags
>> Case sensitive yes
>> Supports 8-bit characters yes
>> Converts 8859-1 to UTF-16/UCS-2 no
>> Honours --encoding=NAME no
>> False positives possible no
>> Uses a bitslice implementation no
>> The split() method unifies case no
>> Number of test cases for --test 24
>> Algorithm name 128/128 SSE2 intrinsics 8x4x4
>> Format name dynamic_2: md5(md5($p)) (e107)
>> Benchmark comment
>> Benchmark length -1
>> Binary size 16
>> Salt size 0
>>
>
> NOTE, in dyna.conf, the task is MUCH harder, since it does not know how JtR was built.
If you define a dynamic format in a config file and use max. password
length 80, the specific mmx or other implementation that will be used
"knows" the supported max. password length.
So, it could compare the value specified in the format definition,
compare it with the value that can be supported,
fprintf(stderr, "Warning: max. password length reduced from %d to %d\n",
...);
and reduce the max. password length as if
--length=N force a lower max. length
had been used on the command line.
Frank
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