Re: SHA3 is very slow

On 2017-04-03 14:44, Christian Schneider wrote:

Am 01.04.2017 um 05:12 schrieb Yasuo Ohgaki <yohgaki@ohgaki.net>:

I noticed that our SHA-3 is inefficient. === Ruby SHA3-256 === [yohgaki@dev ~]$ cat t2.rb #!/usr/bin/env ruby require 'digest/sha2' $i = 1000000 until $i do Digest::SHA3.hexdigest("abcdedf", 256) $i -= 1 end

Two things I noticed: 1) As far as I understand Ruby (and as far as I tested it) this does not execute the function at all.

Why am I not surprised...

2) For some reason the Ruby implementation yields different results, I didn't track down why.

Here's another library, which actually works. https://rubygems.org/gems/sha3 Tests with that one: time ruby -e 'require "sha3"; 123456.times { SHA3::Digest::SHA256.hexdigest("abc") }'

user    0m1.597s
sys     0m0.023s

time php -r 'for ($i = 0; $i < 123456; ++$i) hash("sha3-256", "abc");'

user    0m2.497s
sys     0m0.020s

There's a small difference, but I wonder if anybody (except Yasuo) actually cares? -- Lauri Kenttä