Re: [TLS] I-D Action: draft-ietf-tls-curve25519-01.txt
Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Mon, 20 July 2015 13:03 UTC
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Date: Mon, 20 Jul 2015 16:02:54 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Hubert Kario <hkario@redhat.com>
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Cc: Simon Josefsson <simon@josefsson.org>, tls@ietf.org
Subject: Re: [TLS] I-D Action: draft-ietf-tls-curve25519-01.txt
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On Mon, Jul 20, 2015 at 01:42:01PM +0200, Hubert Kario wrote: > On Monday 20 July 2015 14:39:03 Ilari Liusvaara wrote: > > On Mon, Jul 20, 2015 at 12:55:37PM +0200, Hubert Kario wrote: > > > > There are other shortcomings tho: > > - If Ed25519 is supported, one also needs to support Curve25519. > > - If Ed25519 and Curve448 are supported, one needs to support > > Curve25519 and Ed448. > > - And the cross case from previous. > > > > So with the same, in TLS 1.2, the following combinations would > > be possible: > > - None at all. > > - Curve25519 > > - Curve448 > > - Curve25519 & Curve448 > > - Curve25519 & Ed25519 > > - Curve448 & Ed448 > > - Curve25519 & Curve448 & Ed25519 & Ed448. > > if we define separate codepoints for Curve25519 and Ed25519, yes That list was assuming the following: - TLS at least 1.2 (I don't see much point with bothering with lesser versions here). - Unified 255/448 bit signature algorithm as one of SignatureAlgorithm codepoints, using ECDSA ciphersuites. - The same codepoint used for both 25519 kex and sig curve (and the same for 448). Breaking any of those three assumptions changes things here. -Ilari
- [TLS] I-D Action: draft-ietf-tls-curve25519-01.txt internet-drafts
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Hubert Kario
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Simon Josefsson
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Hubert Kario
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Simon Josefsson
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Ilari Liusvaara
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Hubert Kario
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Ilari Liusvaara
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Hubert Kario
- Re: [TLS] I-D Action: draft-ietf-tls-curve25519-0… Ilari Liusvaara