Re: [Cfrg] Point format endian
"Blumenthal, Uri - 0558 - MITLL" <uri@ll.mit.edu> Tue, 27 January 2015 16:26 UTC
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From: "Blumenthal, Uri - 0558 - MITLL" <uri@ll.mit.edu>
To: "'derek@ihtfp.com'" <derek@ihtfp.com>, "'stephen.farrell@cs.tcd.ie'" <stephen.farrell@cs.tcd.ie>
Thread-Topic: [Cfrg] Point format endian
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Date: Tue, 27 Jan 2015 16:25:38 +0000
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Cc: "'cfrg@irtf.org'" <cfrg@irtf.org>, "'pgut001@cs.auckland.ac.nz'" <pgut001@cs.auckland.ac.nz>
Subject: Re: [Cfrg] Point format endian
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Actually, AFAIK, *every* IETF-developed Internet protocol (not just in Security area) uses Big Endian for on-the-wire. -- Regards, Uri Blumenthal Voice: (781) 981-1638 Cyber Systems and Technology Fax: (781) 981-0186 MIT Lincoln Laboratory Cell: (339) 223-5363 244 Wood Street, Lexington, MA 02420-9185 Web: http://www.ll.mit.edu/CST/ MIT LL Root CA: <https://www.ll.mit.edu/labcertificateauthority.html> ----- Original Message ----- From: Derek Atkins [mailto:derek@ihtfp.com] Sent: Tuesday, January 27, 2015 10:41 AM To: Stephen Farrell <stephen.farrell@cs.tcd.ie> Cc: 'cfrg@irtf.org' <cfrg@irtf.org>; Peter Gutmann <pgut001@cs.auckland.ac.nz> Subject: Re: [Cfrg] Point format endian Stephen Farrell <stephen.farrell@cs.tcd.ie> writes: > On 27/01/15 10:34, Peter Gutmann wrote: >> The universal standard for crypto bignums is big-endian > > Hmmm.... sez who? :-) PKIX, OpenPGP, OpenSSH, Kerberos, TLS... Pretty much every existing IETF security standard I know of to date encodes numbers in big-endian format. > But seriously, if in fact this makes little or no difference, > which I believe is the case, and which I believe you are also > arguing, then what is the problem with going with the initial > coder's choice here? > > If there is no problem then just doing that and making sure > it's properly documented should be just fine I'd have thought. It would mean a completely separate code path to support 25519 versus supporting most (all?) existing ECC curves. > S. -derek -- Derek Atkins 617-623-3745 derek@ihtfp.com www.ihtfp.com Computer and Internet Security Consultant _______________________________________________ Cfrg mailing list Cfrg@irtf.org http://www.irtf.org/mailman/listinfo/cfrg
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Brown
- Re: [Cfrg] Point format endian (was: Adoption of … Peter Gutmann
- Re: [Cfrg] Point format endian (was: Adoption of … Alyssa Rowan
- Re: [Cfrg] Point format endian (was: Adoption of … Alyssa Rowan
- Re: [Cfrg] Point format endian (was: Adoption of … Michael Clark
- Re: [Cfrg] Point format endian (was: Adoption of … Michael Clark
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … Michael Clark
- Re: [Cfrg] Point format endian (was: Adoption of … Peter Gutmann
- Re: [Cfrg] Point format endian (was: Adoption of … Stephen Farrell
- Re: [Cfrg] Point format endian (was: Adoption of … Peter Gutmann
- Re: [Cfrg] Point format endian (was: Adoption of … Alyssa Rowan
- Re: [Cfrg] Point format endian (was: Adoption of … Stephen Farrell
- Re: [Cfrg] Point format endian (was: Adoption of … Peter Gutmann
- Re: [Cfrg] Point format endian (was: Adoption of … Stephen Farrell
- Re: [Cfrg] Point format endian (was: Adoption of … Salz, Rich
- Re: [Cfrg] Point format endian Derek Atkins
- Re: [Cfrg] Point format endian Salz, Rich
- Re: [Cfrg] Point format endian Stephen Farrell
- Re: [Cfrg] Point format endian Paul Hoffman
- Re: [Cfrg] Point format endian Derek Atkins
- Re: [Cfrg] Point format endian Derek Atkins
- Re: [Cfrg] Point format endian Blumenthal, Uri - 0558 - MITLL
- Re: [Cfrg] Point format endian Paul Hoffman
- Re: [Cfrg] Point format endian Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … Andy Lutomirski
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Stephen Farrell
- Re: [Cfrg] Point format endian Tony Arcieri
- Re: [Cfrg] Point format endian (was: Adoption of … Michael Clark
- Re: [Cfrg] Point format endian Damien Miller
- Re: [Cfrg] Point format endian Phillip Hallam-Baker
- Re: [Cfrg] Point format endian Phillip Hallam-Baker
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … D. J. Bernstein
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd