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[jose] Re: Strawperson consensus call for changes to draft-ietf-jose-hpke-encrypt-01

tirumal reddy <kondtir@gmail.com> Thu, 11 July 2024 08:49 UTC

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From: tirumal reddy <kondtir@gmail.com>
Date: Thu, 11 Jul 2024 14:18:23 +0530
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To: Ilari Liusvaara <ilariliusvaara@welho.com>
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Subject: [jose] Re: Strawperson consensus call for changes to draft-ietf-jose-hpke-encrypt-01
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On Thu, 11 Jul 2024 at 13:12, Ilari Liusvaara <ilariliusvaara@welho.com>
wrote:

> On Thu, Jul 11, 2024 at 11:19:19AM +0530, tirumal reddy wrote:
> >
> >
> > I would like add another option proposed below for HPKE JWE Integrated
> > Encryption Mode:
> >
> > The algorithm name SHALL be of the form "HPKE-P256-SHA256".
> > The "enc" value SHALL be " A128GCM".
> > The hpke-aad SHALL be of the form "protected (.aad)", as described in
> Step
> > 15 of RFC7516.
> > The hpke-info SHALL be the same as is provided to concatKDF info for
> > ECDH-ES, as described in
> > https://datatracker.ietf.org/doc/html/rfc7518#section-4.6.2
>
> JWE does not allow doing that.
>

Why does not JWE allow use of  {"alg" : "HPKE-P256-SHA256", "enc":
A128GCM"} in case of direct key agreement mode ?


>
> "A128GCM" is valid AEAD algorithm, and JWE is very clear on how such
> thing is processed. And that processing is flat out incompatible with
> Integrated Encryption or using HPKE for bulk encryption.
>
>
>
>
> -Ilari
>
>
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