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Re: [Gen-art] GEN-Art LC review of draft-ietf-jose-cfrg-curves-05

Ilari Liusvaara <ilariliusvaara@welho.com> Thu, 18 August 2016 13:20 UTC

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Date: Thu, 18 Aug 2016 16:20:43 +0300
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: Jari Arkko <jari.arkko@piuha.net>
Subject: Re: [Gen-art] GEN-Art LC review of draft-ietf-jose-cfrg-curves-05
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On Thu, Aug 18, 2016 at 02:21:27PM +0200, Jari Arkko wrote:
> Thanks for your review, Roni!
> 
> Authors, did you observe the editorial suggestions?

Did the changes to Editor's Copy.

The comment about corner-cases I just deleted[1].


My understanding (I am a newbie to writing IETF RFCs) is that in this
stage of process, I should not submit updated version without being
told to do that (IIRC, by shepherd, AD or datatracker state).




[1] Basically, ECDSA specifies that if the hash is longer than the
bitlength of the order, the hash gets truncated.

With NIST curves and hashes any such truncation is always to integral
number of octets.

However, Curve25519 is so small even SHA-256 would truncate, and
since its order is ~2^252, the truncation would be to fractional
number of octets.



-Ilari.

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