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Date: Tue, 7 Jan 2014 11:27:16 +0100
From: Frank Dittrich <>
Subject: Accepting multiple format tags as valid (was:  dynamic_2000 - dynamic_2014)

On 01/07/2014 11:14 AM, magnum wrote:
> On 2014-01-07 09:43, Frank Dittrich wrote:
>> Format dynamic_33 could also accept $NT$ hashes.
>> Currently, it only recognizes the plain hex hashes without any prefix.
>> But NT hashes and dynamic_33 hashes only differ in their prefix.
>> In this case, it might even be good if dynamic_33 would use $NT$ as the
>> default prefix.
>> Also, all the implementations (dynamic_33, nt, nt2) support the same
>> max. password length of 27.
>> At least accepting $NT$ as valid would be an improvement.
>> Instead of dynamic_33 using an $NT$ prefix as the canonical
>> representation, nt and nt2 could also use $dynamic_33$ as a prefix,
>> since dynamic_33 is implemented in C, and not defined in a config file.
>> But my personal preference would be to use $NT$.
> I think it should simply be one single but *configurable* tag. If
> nothing is configured, dynamic_1000 will have $dynamic_1000$ but if it's
> configured as $foo$, that and only that tag is valid, and is written to
> pot. Constraint on configured tag is that it start and ends with $

1. If we drop $dynamic_33$ as valid, then hashes stored in an older pot
file will be ignored, because these will use $dynamic_33$.

2. As long as this doesn't lead to a dynamic format grabbing hashes it
can't crack, I wouldn't use any restrictions regarding a possible prefix.

> On a related note I've had thoughts about core *) functionality for tag
> aliasing. A list of tags will be accepted, but converted to a canonical
> tag at loader stage with no particular support from the format. The
> canonical (the format's) tag will be written to pot so in that end no
> logic is needed.
> Speaking of that I've also considered some kind of format name aliasing.
> That way when we change the name of a format, the old name can still be
> used. It will be converted during options parsing, so format will know
> nothing about it. You would love writing bash completion for that %-)
> Both these will have their lists in john.conf.

Will you post your design ideas/decisions to john-dev first, or will we
find out once the change hits bleeding-jumbo?


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