Date: Sat, 12 Sep 2015 19:10:23 +0300 From: Aleksey Cherepanov <lyosha@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: mask + external as filter, generic combinable filters On Sat, Sep 12, 2015 at 05:10:04PM +0200, magnum wrote: > On 2015-09-12 15:40, Aleksey Cherepanov wrote: > >I tried to combine a custom external filter and mask mode: > > > >$ ./JohnTheRipper/run/john --session=des-cp --format=descrypt --internal-encoding=cp1251 results/uncracked/* '--mask=?1?1?1' '-1=?aЯ' --external=Filter_ascii_without_ya > >No generate() for external mode: Filter_ascii_without_ya > > > >I guess mask mode is treated as filter and external mode as generator > >in such combination. What are plans about combinable filters? It looks > >like john got a lot of candidate generators, so a generic solution > >might be helpful, no? > > Yes, currently when combining mask mode with external, external is the > generator and mask mode is an amplifier (eg. word -> word1, word2, word3). > > We should probably support the other way round too, eg. mask generator and > external filter. But what would the option syntax be for selecting behavior? > If nothing else, an external mode that lacks generate(), like in your case, > should automagically select mask mode as the generator. There are various options: - separate options to invoke external as filter and as generator, (BTW there may be third option: to use external as amplifier, allowing it to generate several candidates from 1 input. Solar Designer once told me that it should be hard to implement with additional global variable exposed to external, but this variable affect speed for pure filter case too... Having a separate "mode", it is possible to avoid performance hit for regular uses.) - use position of args: -mask= -ext= -- mask is generator, external is filter. -ext= -mask= -- external is generator, mask is filter. I guess positional args are not welcome. So it might be done through config file. BTW I tried to use both mask and external as filters: Can't use Hybrid Mask mode with External Filter Ability to use more than 1 filter means that there may be performance benefits from changes to order of filters. For me, it looks like a generic pipeline with generator and chain of filters. Of course, it is possible to construct any pipeline using --pipe and --stdout, but it disallows --fork and may be slower than "pipeline" right in guts of john. Thanks! -- Regards, Aleksey Cherepanov
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