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Date: Thu, 13 Jun 2013 09:04:35 +0530
From: Sayantan Datta <std2048@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Mask mode for GPU

On Thursday 13 June 2013 06:09 AM, Solar Designer wrote:
> Yet I'd like us to implement the same kind of mask mode that those two
> other crackers do.  (We can then extend it in our own ways.)
Okay. So first of all I need to figure out a way to generate the keys 
corresponding to the mask. After that we may apply the mask as we like.

Also I think it is better to keep things simple on the gpu part:
I am thinking to using only four configuration ?l ,?u, ?d, ?[0x20-0x2f] 
on GPU. Any other combination will need to be generated by the CPU.
If someone needs alphanumeric key say ?[0-9][a-z]?[0-9][a-z]
then the cpu will generate following masks for gpu: ?d?d , ?l?d, ?d?l, ?l?l

Also the other missing characters such as 
?[0x3A-0x40][0x5B-0x60][0x7B-0x7F][non printable ascii] will need to be 
genrated on cpu.

Regards,
Sayantan

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