Re: 2nd Working Group Last Call: draft-ietf-httpbis-encryption-encoding-03.txt

Julian Reschke <julian.reschke@gmx.de> Wed, 19 October 2016 06:48 UTC

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To: Poul-Henning Kamp <phk@phk.freebsd.dk>
References: <147607568231.30483.6721771001967558206.idtracker@ietfa.amsl.com> <06660B0E-6F8D-42DF-A909-C216B49FB590@mnot.net> <03fb16fd-35d4-e5d3-86d4-317b1016829e@gmx.de> <CABkgnnWKOTheZ9Gf9WLfVWAsQwNWi=EM6LhX=Za+UXnXQkf6AQ@mail.gmail.com> <90ee7958-5697-23ad-6f52-060f58800067@gmx.de> <7720.1476858421@critter.freebsd.dk>
Cc: Martin Thomson <martin.thomson@gmail.com>, Mark Nottingham <mnot@mnot.net>, HTTP working group mailing list <ietf-http-wg@w3.org>, Patrick McManus <pmcmanus@mozilla.com>
From: Julian Reschke <julian.reschke@gmx.de>
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Date: Wed, 19 Oct 2016 08:43:02 +0200
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Subject: Re: 2nd Working Group Last Call: draft-ietf-httpbis-encryption-encoding-03.txt
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On 2016-10-19 08:27, Poul-Henning Kamp wrote:
> --------
> In message <90ee7958-5697-23ad-6f52-060f58800067@gmx.de>de>, Julian Reschke writes
> :
>
>> In any case: this sounds like a band-aid. I think it would be good to
>> discuss the whole parametrization of content codings...
>
> I have been pondering the "only encryptions will need parameters"
> comment somebody made some days ago, and I have a hard time finding
> out why that should be true.
>
> Why is it that encryptions cannot prefix their necessary parameters
> in the wame way compressions do (see gzip header) ?
>
> Or to be concrete:  Why wouldn't this work:
>
>    HTTP/1.1 200 OK
>    Content-Type: text/html
>    Content-Encoding: gzip, aesgcm
>    Transfer-Encoding: chunked
>
>    {magic marker}
>    keyid="me@example.com".com";
>    salt="m2hJ_NttRtFyUiMRPwfpHA"
>    {magic terminator}
>    [encrypted payload]

Because you might want to ship the parameters somewhere else. See 
example in 
<https://greenbytes.de/tech/webdav/draft-reschke-http-oob-encoding-08.html#rfc.section.3.5.3>.

Best regards, Julian