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Date: Sat, 11 Oct 2014 09:01:39 +0530
From: Sayantan Datta <>
To: john-dev <>
Subject: Re: Restart work on mask mode

Hi Solar, magnum,

On Tue, Sep 30, 2014 at 4:13 AM, magnum <> wrote:

> On 2014-09-28 05:31, Sayantan Datta wrote:
>> I think we should follow the external mode technique with this one. In all
>> modes incremental or wordlist  we should have:
>> if (do_mask_crack(word))
>>    if (external_filter(word)) // not executed when mask is active
>>        crk_process_key(); // not executed when mask is active
>> The do_mask_crack() will return null when a mask is active and call
>> crk_process_key() from within. This process necessitates splitting mask
>> mode into three separate functions:
>> init_mask(char *mask, db_main *db) - initialize mask
>> do_ mask_crack() - generates the keys and calls external_filter() and
>> crk_process_keys().
>> exit_mask() - for cleanup.
>> The init_mask() and exit_mask() function should be called during
>> entry(just
>> after initializing db_main, preferably after initializing a format because
>> we might need some input from the format parameters as well for GPU
>> cracking.) and exit from john respectively.
>> When only mask mode is working, the do_mask_crack() would be used as usual
>> with a NULL in the argument. However when other modes are active,
>> do_mask_crack() is called within those modes.
> Note that we need to decide how/when to distribute work when using stacked
> modes together with node/fork/MPI. Unless we change the other modes, they
> will distribute so mask mode must not. But when using mask mode alone, it
> has to distribute work like it does now (ideally a lot more effective than
> now though, there's an issue for that).
> magnum
Do we have the green light ?


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