Re: [TLS] Curve25519 in TLS
Nico Williams <nico@cryptonector.com> Thu, 17 October 2013 20:21 UTC
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Date: Thu, 17 Oct 2013 15:21:17 -0500
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From: Nico Williams <nico@cryptonector.com>
To: "mrex@sap.com" <mrex@sap.com>
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Cc: Simon Josefsson <simon@josefsson.org>, Manuel Pégourié-Gonnard <mpg@elzevir.fr>, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] Curve25519 in TLS
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On Thu, Oct 17, 2013 at 1:30 PM, Martin Rex <mrex@sap.com> wrote: > This should probably be a variable length vector so that the > format can be reused beyond curve25519 for similar curves with > longer keys (is curve3617 such a thing?) Yes (and yes, at least it exists as a curve specification in safecurves.cr.yp.to; dunno if code exists). (Ditto Curve1174.) <aside> If the choice is between sequence {curve ID, variable-length octet string} extensible choice with curve ID as discriminant and the value type is a fixed-sized octet string of size given by the curve ID sequence {curve ID, octet string of size given by curve ID} which is best? The first two are commonplace and easy to implement; the first being the easiest to implement. The last is akin to ASN.1's IOS -- too complex, no one will bother as no one has bothered. So that's two choices, the first one being historically easier to implement. </aside> > Extending plus subsetting rfc4492, so that PDUs and code points > for ECDH cipher suites can be shared between curve25519 and other > ECC curves, seems appropriate and acceptable. Yes. > But I would highly appreciate if the generic bloat, brittleness and > timing-sensitive ECC math of regular rfc4492 can be avoided as much > as possible. So a new, simplified/specialized ECPoint format that > is mandatory for use with curve25519 and relatives, would help a lot. Agreed. Nico --
- [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