Re: [openpgp] AEAD Chunk Size

"Derek Atkins" <derek@ihtfp.com> Tue, 16 April 2019 00:16 UTC

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Date: Mon, 15 Apr 2019 20:16:02 -0400
From: "Derek Atkins" <derek@ihtfp.com>
To: "Jon Callas" <joncallas=40icloud.com@dmarc.ietf.org>
Cc: "Bart Butler" <bartbutler@protonmail.com>, "openpgp@ietf.org" <openpgp@ietf.org>, "Justus Winter" <justuswinter@gmail.com>, "Neal H. Walfield" <neal@walfield.org>, "Jon Callas" <joncallas@icloud.com>, "Peter Gutmann" <pgut001@cs.auckland.ac.nz>
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Subject: Re: [openpgp] AEAD Chunk Size
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Jon,

On Mon, April 15, 2019 8:00 pm, Jon Callas wrote:
>
[snip]

> Me too. I think saying 256K is fine. I have an intuition it ought to be at
> least as large as the largest Jumbo Frame, and that's 9K so round to 16K.
> Let me restate the proposal.
>
> (1) MUST support up to <chunk-size> chunks.
> (3) MAY support larger up to the present very large size.
> (4) MAY reject or error out on chunks larger than <chunk-size>
>
> And it seems that 256K is the proposal for <chunk-size>. Are we agreed on
> all that?

I would rather 256K not be the One Required Size.  It's larger than the
RAM size on some of my systems.  I would still prefer 16K (or even 8K).

-derek

-- 
       Derek Atkins                 617-623-3745
       derek@ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant