Re: [TLS] Curve25519 in TLS
Simon Josefsson <simon@josefsson.org> Wed, 16 October 2013 20:17 UTC
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Date: Wed, 16 Oct 2013 22:16:40 +0200
From: Simon Josefsson <simon@josefsson.org>
To: Manuel Pégourié-Gonnard <mpg@elzevir.fr>
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Cc: "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] Curve25519 in TLS
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You wrote: > Thinking about it, I'm inclined to say we don't need to define a new > ECPointFormat entry, the I-D should just mandate that support for > (resp. use of) curve25519 implies support for (resp. use of) the > associated (unamed) point format. This avoids possible consistency > issues like a client advertising support for the curve but not for > the associated point format. > > Similarly, the usual point formats have a leading byte indicating the > format used, that should IMO be dropped for curve25519. > > So this would lead to the definition that, for this curve, instead of > containing "the byte string representation of a field element > following the conversion routine in Section 4.3.3 of ANSI X9.62", the > point member of the ECPoint structure contains an opaque[32] > representing the x-coordinate of the point. This sounds like a feasible approach to me. Maybe we need to put this solution in writing, and maybe put some of the other options in writing as well, to allow people to make an informed decision of where to go. I think this thread has been quite informative, and I'm hoping we can reach some early consensus and update the draft with that. /Simon
- [TLS] Testing consensus for adding curve25519 to … Adam Langley
- Re: [TLS] Testing consensus for adding curve25519… Russ Housley
- Re: [TLS] Testing consensus for adding curve25519… Rob P Williams
- Re: [TLS] Testing consensus for adding curve25519… Patrick Pelletier
- Re: [TLS] Testing consensus for adding curve25519… Douglas Stebila
- Re: [TLS] Testing consensus for adding curve25519… Douglas Stebila
- Re: [TLS] Testing consensus for adding curve25519… Nick Mathewson
- [TLS] Curve25519 in TLS Simon Josefsson
- Re: [TLS] Testing consensus for adding curve25519… Nico Williams
- Re: [TLS] Testing consensus for adding curve25519… Douglas Stebila
- Re: [TLS] Testing consensus for adding curve25519… Dan Brown
- Re: [TLS] Curve25519 in TLS Rob Stradling
- Re: [TLS] Testing consensus for adding curve25519… Nick Mathewson
- Re: [TLS] Testing consensus for adding curve25519… Dan Brown
- Re: [TLS] Curve25519 in TLS Simon Josefsson
- Re: [TLS] Testing consensus for adding curve25519… Douglas Stebila
- Re: [TLS] Curve25519 in TLS Kyle Hamilton
- Re: [TLS] Curve25519 in TLS Rob Stradling
- Re: [TLS] Curve25519 in TLS Yoav Nir
- Re: [TLS] Curve25519 in TLS Dan Brown
- Re: [TLS] Curve25519 in TLS Bodo Moeller
- [TLS] Koblitz curves [was RE: Curve25519 in TLS] Dan Brown
- Re: [TLS] Curve25519 in TLS Rob Stradling
- Re: [TLS] Curve25519 in TLS Simon Josefsson
- Re: [TLS] Curve25519 in TLS Rob Stradling
- Re: [TLS] Curve25519 in TLS Nico Williams
- Re: [TLS] Curve25519 in TLS Rob Stradling
- Re: [TLS] Curve25519 in TLS Paul Bakker
- Re: [TLS] Curve25519 in TLS Yoav Nir
- Re: [TLS] Curve25519 in TLS Rob Stradling
- [TLS] Curve25519 in TLS Simon Josefsson
- [TLS] Ed25519 for PKIX Simon Josefsson
- Re: [TLS] Ed25519 for PKIX Adam Langley
- Re: [TLS] Ed25519 for PKIX Simon Josefsson
- Re: [TLS] Curve25519 in TLS Manuel Pégourié-Gonnard
- Re: [TLS] Curve25519 in TLS Martin Rex
- Re: [TLS] Curve25519 in TLS Juho Vähä-Herttua
- Re: [TLS] Curve25519 in TLS Manuel Pégourié-Gonnard
- Re: [TLS] Curve25519 in TLS Watson Ladd
- Re: [TLS] Curve25519 in TLS Manuel Pégourié-Gonnard
- Re: [TLS] Curve25519 in TLS Simon Josefsson
- Re: [TLS] Curve25519 in TLS Martin Rex
- Re: [TLS] Curve25519 in TLS Nico Williams