Re: [TLS] Salsa20 and Poly1305 in TLS

Ben Laurie <benl@google.com> Tue, 06 August 2013 21:55 UTC

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Date: Tue, 6 Aug 2013 22:54:52 +0100
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From: Ben Laurie <benl@google.com>
To: Adam Langley <agl@google.com>, Emilia Kasper <ekasper@google.com>
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Cc: Ted Krovetz <ted@krovetz.net>, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] Salsa20 and Poly1305 in TLS
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[+ekasper]

Emilia was getting some interesting results doing this kind of stuff many
times in parallel...


On 6 August 2013 17:38, Adam Langley <agl@google.com> wrote:

> On Tue, Aug 6, 2013 at 12:20 PM, Ted Krovetz <ted@krovetz.net> wrote:
> > I'm a bozo. When I gave you the VMAC code using ARM intrinsics I should
> have explicitly reminded you to enable NEON when compiling:
> >
> >   gcc -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=hard
> >
> > On a modern ARM, you should always use these settings so that your
> compiler uses the NEON unit when possible.
>
> Thank you! I used -O3, but I don't develop on ARM very often.
>
> Please ignore previous measurements for VMAC on ARM.
>
> VMAC (ARM, 128-bit, with AES calls removed): 5015.1ns with 248 bytes of
> memory
> Poly1305 (ARM, with same flags): 3457ns
>
> I don't believe that either can be said to be better than the other
> now, which makes the call harder if anything :)
>
>
> Cheers
>
> AGL
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