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Date: Fri, 3 Feb 2017 16:50:25 +0100
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: to Single or not to Single
Jim,
On Fri, Feb 03, 2017 at 04:34:57PM +0100, Solar Designer wrote:
> ./configure --disable-native-tests CFLAGS='-O2 -mno-sse2 -mno-mmx -U__SSE__'
> make -sj8
>
> to produce a non-SIMD build, so that you'd have a lower min_keys_per_crypt.
>
> Combined, these settings will save you some memory on allowing for much
> smaller per-salt buffers of candidate passwords. (Normally, "single
> crack" mode buffers from 128 to 1024 candidate passwords per salt, to
> benefit from bitslicing, SIMD, OpenMP, etc. and to amortize the overhead
> of salt switching.)
>
> $ time ./john --single=None --nolog --verbosity=1 pw-1M
> Using default input encoding: UTF-8
> Loaded 1000000 password hashes with 1000000 different salts (dynamic_25 [sha1($s.$p) 64/64])
BTW, the 64/64 reporting here is probably a bug. Without SIMD, SHA-1
can reasonably use at most 32 bits. So it should be 32/64 here, no?
Alexander
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