Date: Tue, 19 Jun 2012 17:31:39 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: [patch] optional new raw sha1 implemetation On Tue, Jun 19, 2012 at 03:11:30PM +0200, Tavis Ormandy wrote: > I don't think so, the performance impact is indeed very small, 0.1% > sounds right. Still, I want that 0.1% :-) Understood. 0.1% was almost a worst case estimate. How large is your actual max_keys_per_crypt? Is your cmp_one() really as heavy as one SHA-1 computation? Are you frequently running this against exactly 1 or 2 loaded hashes (not 3 or more)? I am not sure if there's a way to reclaim that 0.1% without incurring it (or more) elsewhere. For example, you can do full instead of partial hash comparisons in cmp_all(), but this might make its code slower (through differences in the code and maybe through worse locality of reference when full rather than partial binary hashes are in memory). Alexander
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