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Date: Thu, 26 Jul 2012 02:25:50 +0400
From: Alexander Cherepanov <>
Subject: Re: mscash2 / hmac-md5 ambiguity

On 2012-07-24 02:59, Frank Dittrich wrote:
> On 07/23/2012 11:36 PM, Alexander Cherepanov wrote:
>> On 2012-07-23 14:59, magnum wrote:
>>> The hmac format should unify case too, it's a to-do (and a bug). IMHO
>>> the only really good solution is to accept the harmless warning. We get
>>> very similar warnings in many other situations.
>> How many such situations are there?
>> For now I see the following:
>> canonical       is accepted as
>> dynamic_23      sapg
>> mscash2            hmac-md5
>> mssql05            dynamic_19
>> oracle11    dynamic_0 dynamic_2 dynamic_3 dynamic_19 dynamic_22
>> dynamic_23 dynamic_26 dynamic_29 dynamic_30 dynamic_33 dynamic_34
>> dynamic_50 dynamic_1001 dynamic_1002 dynamic_1003 dynamic_1004
>> dynamic_1005 dynamic_1006 dynamic_1010
>> phpass            dynamic_17
>> phps            dynamic_6
>> raw-md5            dynamic_0
>> raw-sha1    raw-sha1 raw-sha1-linkedin sapg raw-sha1-ng dynamic_26
> There is a workaround as long as there is just one hash type per
> "collision" required during the contest.
> We could consider renaming the *_fmt_plug.c files (or moving unneeded
> plugin formats to unused/) and/or patching john.c and recompile and/or
> removing dynamic_10?? format definitions from the config file, to
> register the formats in a sequence that makes sure the relevant format
> appears first.
> Not sure if we want to do that in the first hour of the contest, only to
> realize some time later that we need additional formats.

Yes, that could work.

But maybe requiring to always write --format is not too laborious? 
Probably during contest I will run john only through some wrappers which 
set --format, --session etc.

Alexander Cherepanov

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