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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "justin@uberti.name" <justin@uberti.name>
CC: "deadbeef@google.com" <deadbeef@google.com>, "tram@ietf.org"
 <tram@ietf.org>, "sperreault@jive.com" <sperreault@jive.com>,
 "tireddy@cisco.com" <tireddy@cisco.com>, "praspati@cisco.com"
 <praspati@cisco.com>, Gonzalo Camarillo <gonzalo.camarillo@ericsson.com>,
 "rmohanr@cisco.com" <rmohanr@cisco.com>
Thread-Topic: [tram] [Technical Errata Reported] RFC7635 (5059)
Thread-Index: AQHS9i9Y0HUi33cifkeKgW+G6emAKql9fXuAgAGrDICArnCqAA==
Date: Wed, 13 Jan 2021 15:43:05 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tram/GwPaYs59qwGRrnJXz3qMjW1vLE8>
Subject: Re: [tram] [Technical Errata Reported] RFC7635 (5059)
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Hi,

I would like to conclude on this. Can I verify it?

Cheers

Magnus=20

On Thu, 2020-09-24 at 08:50 -0700, Justin Uberti wrote:
> This looks correct to me at first glance. Will re-read in context and giv=
e a
> definitive answer.
>=20
> On Wed, Sep 23, 2020 at 7:22 AM Magnus Westerlund <
> magnus.westerlund@ericsson.com> wrote:
> > Hi,
> >=20
> > I would appreciate some response regarding this Errata. Should it be
> > verified,
> > held for document update, or rejected?=20
> >=20
> > Cheers
> >=20
> > Magnus Westerlund
> >=20
> > On Wed, 2017-07-05 at 16:26 -0700, RFC Errata System wrote:
> > > The following errata report has been submitted for RFC7635,
> > > "Session Traversal Utilities for NAT (STUN) Extension for Third-Party
> > > Authorization".
> > >=20
> > > --------------------------------------
> > > You may review the report below and at:
> > > http://www.rfc-editor.org/errata/eid5059
> > >=20
> > > --------------------------------------
> > > Type: Technical
> > > Reported by: Taylor Brandstetter <deadbeef@google.com>
> > >=20
> > > Section: 6.2
> > >=20
> > > Original Text
> > > -------------
> > >    key_length:  Length of the session key in octets.  The key length =
of
> > >       160 bits MUST be supported (i.e., only the 160-bit key is used =
by
> > >       HMAC-SHA-1 for message integrity of STUN messages).  The key
> > >       length facilitates the hash agility plan discussed in Section 1=
6.3
> > >       of [RFC5389].
> > >=20
> > >=20
> > > Corrected Text
> > > --------------
> > >    key_length:  Length of the session key in octets.
> > >=20
> > > Notes
> > > -----
> > > RFC2104 section 2 states:
> > >=20
> > >    The authentication key K can be of any length up to B, the
> > >    block length of the hash function.  Applications that use keys lon=
ger
> > >    than B bytes will first hash the key using H and then use the
> > >    resultant L byte string as the actual key to HMAC.
> > >=20
> > > Meaning any key length is allowed. The fact that the hash output is 2=
0
> > bytes
> > > doesn't mean the key needs to be 20 bytes as well.
> > >=20
> > > 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 =20
> > > can log in to change the status and edit the report, if necessary.=
=20
> > >=20
> > > --------------------------------------
> > > RFC7635 (draft-ietf-tram-turn-third-party-authz-16)
> > > --------------------------------------
> > > Title               : Session Traversal Utilities for NAT (STUN) Exte=
nsion
> > for
> > > Third-Party Authorization
> > > Publication Date    : August 2015
> > > Author(s)           : T. Reddy, P. Patil, R. Ravindranath, J. Uberti
> > > Category            : PROPOSED STANDARD
> > > Source              : TURN Revised and Modernized
> > > Area                : Transport
> > > Stream              : IETF
> > > Verifying Party     : IESG
> > >=20
> > > _______________________________________________
> > > tram mailing list
> > > tram@ietf.org
> > > https://www.ietf.org/mailman/listinfo/tram

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