phc-discussions - Re: [PHC] OMG we have benchmarks

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Message-ID: <CAAS2fgSpsEMjjo2igo1Qc8zFyT-Ap0Q3u26MSkSOOAv5LRuDkg@mail.gmail.com>
Date: Fri, 3 Apr 2015 09:31:13 +0000
From: Gregory Maxwell <gmaxwell@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] OMG we have benchmarks

On Fri, Apr 3, 2015 at 9:20 AM, Peter Gutmann <pgut001@...auckland.ac.nz> wrote:
> SHA-glue-factory-candidate: The 224-bit one

has the useful property that you can fit two of its untruncated
outputs into the input of a single invocation of the hash. This is a
2x speedup for a straight forward hashtree that uses SHA-224 vs
SHA-256 in the most simple and direct way.

The side reduced versions have the useful property of just having a
different initialization and then you truncate the output, so all the
code can be shared.

So the the differences amount to 32bit vs 64bit and some constants.