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Re: [TLS] Last call comments and WG Chair review of draft-ietf-tls-ecdhe-psk-aead

Yoav Nir <ynir.ietf@gmail.com> Wed, 22 February 2017 11:43 UTC

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From: Yoav Nir <ynir.ietf@gmail.com>
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Date: Wed, 22 Feb 2017 13:43:21 +0200
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To: Martin Thomson <martin.thomson@gmail.com>
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Cc: draft-ietf-tls-ecdhe-psk-aead@tools.ietf.org, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] Last call comments and WG Chair review of draft-ietf-tls-ecdhe-psk-aead
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> On 22 Feb 2017, at 8:42, Martin Thomson <martin.thomson@gmail.com> wrote:
> 
> On the interaction with TLS 1.3, we probably need a decision to be made:
> 
> 1. strike TLS 1.3 from the document and only mention it in the way Joe
> suggests, TLS 1.3 doesn't get the CCM suites (it already has the
> equivalent of the GCM suites)
> 
> 2. strike TLS 1.3 from the document, and add new TLS 1.3 CCM cipher
> suites to TLS 1.3 proper

Wait, what am I missing?

From appendix A.4 in TLS 1.3:

              +------------------------------+-------------+
              | Description                  | Value       |
              +------------------------------+-------------+
              | TLS_AES_128_GCM_SHA256       | {0x13,0x01} |
              |                              |             |
              | TLS_AES_256_GCM_SHA384       | {0x13,0x02} |
              |                              |             |
              | TLS_CHACHA20_POLY1305_SHA256 | {0x13,0x03} |
              |                              |             |
              | TLS_AES_128_CCM_SHA256       | {0x13,0x04} |
              |                              |             |
              | TLS_AES_128_CCM_8_SHA256     | {0x13,0x05} |
              +------------------------------+-------------+

So, how do we not have CCM in TLS 1.3 given that things like ECDHE and PSK are now orthogonal to ciphersuites?

Yoav

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