Re: [TLS] I-D Action: draft-ietf-tls-external-psk-importer-01.txt

This update includes recent feedback received on the list and GitHub. There are three major changes:

- Target KDFs instead of hash algorithms when importing external PSKs
- Add an opaque "context" slot to the ImportedIdentity struct and describe its use for Selfie mitigations
- Remove backwards compatibility ((D)TLS 1.2 and earlier) cruft

(There's a silly formatting issue with the KDF table. We'll fix that in the next version.)

Please have a look and provide feedback. PRs are welcome and highly encouraged.

Looking ahead, there is one outstanding PR [1] that discussion. It deviates from an original goal of the importer, which was to not make any changes to TLS. There's also an issue to better document the importer security requirements and goals [2]. We are working on analyzing the importer and should be complete before Singapore, at which point we'll update the draft again.

Best,
Chris (no hat)

On Wed, Oct 2, 2019, at 6:44 AM, internet-drafts@ietf.org wrote:
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Transport Layer Security WG of the IETF.
> 
>         Title           : Importing External PSKs for TLS
>         Authors         : David Benjamin
>                           Christopher A. Wood
> 	Filename        : draft-ietf-tls-external-psk-importer-01.txt
> 	Pages           : 9
> 	Date            : 2019-10-02
> 
> Abstract:
>    This document describes an interface for importing external PSK (Pre-
>    Shared Key) into TLS 1.3.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tls-external-psk-importer/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-tls-external-psk-importer-01
> https://datatracker.ietf.org/doc/html/draft-ietf-tls-external-psk-importer-01
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-tls-external-psk-importer-01
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
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