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Date: Wed, 14 Jan 2015 01:33:48 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
CC: atom <atom@...hcat.net>
Subject: Re: PRINCE
On 2015-01-14 00:58, magnum wrote:
> On 2015-01-13 19:49, Solar Designer wrote:
>> As a maybe better alternative, what about "double"? Have you tried?
>
> Good idea, that was totally trivial given my present code. The modulo
> operation now used fmod() and got very slow so I also tried a version
> that casted the modulos and divisions to uint128_t and otherwise use
> double. That one was actually fastest of them all with a slight margin:
>
> Running in 30s against 1 fake NT hash:
> =========================================
> double w/ int128 mod/div: 8940 Kp/s 146%
> int128: 8843 Kp/s 144%
> GMP: 6141 Kp/s 100%
> double: 5441 Kp/s 89%
Sorry, I screw up the double+cast build. It's not faster at all. Here's
a correct table:
Running in 30s against 1 fake NT hash:
=========================================
int128: 8843 Kp/s 144%
GMP: 6141 Kp/s 100%
double: 5441 Kp/s 89%
double w/ int128 mod/div: 5253 Kp/s 86%
magnum
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