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Re: [TLS] [Editorial Errata Reported] RFC8446 (6122)

Peter Wu <peter@lekensteyn.nl> Fri, 01 May 2020 09:47 UTC

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Date: Fri, 01 May 2020 11:46:57 +0200
From: Peter Wu <peter@lekensteyn.nl>
To: RFC Errata System <rfc-editor@rfc-editor.org>
Cc: ekr@rtfm.com, rdd@cert.org, kaduk@mit.edu, caw@heapingbits.net, joe@salowey.net, sean+ietf@sn3rd.com, research@bensmyth.com, tls@ietf.org
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Subject: Re: [TLS] [Editorial Errata Reported] RFC8446 (6122)
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Hi,

The original text was not wrong. Originally TLS 1.2 and before defined a
PRF for key derivation, and there exist multiple instantiations with
different hash functions (e.g. SHA-256 and SHA-384). So each
instantiation could be considered a different function.

Your suggested text can also be considered correct as there is only
construction in TLS 1.2, but I don't think it is worth marking the text
as in error.

I suggest to reject this.

Kind regards,
Peter

On Fri, Apr 24, 2020 at 02:08:11AM -0700, RFC Errata System wrote:
> The following errata report has been submitted for RFC8446,
> "The Transport Layer Security (TLS) Protocol Version 1.3".
> 
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid6122
> 
> --------------------------------------
> Type: Editorial
> Reported by: Ben Smyth <research@bensmyth.com>
> 
> Section: 1.2
> 
> Original Text
> -------------
> The key derivation functions have been redesigned.
> 
> Corrected Text
> --------------
> The key derivation function has been redesigned.
> 
> Notes
> -----
> 
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party  
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC8446 (draft-ietf-tls-tls13-28)
> --------------------------------------
> Title               : The Transport Layer Security (TLS) Protocol Version 1.3
> Publication Date    : August 2018
> Author(s)           : E. Rescorla
> Category            : PROPOSED STANDARD
> Source              : Transport Layer Security
> Area                : Security
> Stream              : IETF
> Verifying Party     : IESG
> 
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