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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 14:22 UTC

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From: tirumal reddy <kondtir@gmail.com>
Date: Thu, 11 Jul 2024 19:51:55 +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 18:29, Ilari Liusvaara <ilariliusvaara@welho.com>
wrote:

> On Thu, Jul 11, 2024 at 02:18:23PM +0530, tirumal reddy wrote:
> > 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 ?
>
> That would preclude bulk encryption using HPKE and require using HPKE
> secret export (SendExport* and ReceiveExport*) for generating CEK for
> performing standard JOSE bulk encryption. More complicated to implement,
> but does not need JWE extensions.
>

I don't get the complication, HPKE secret export is already used by
protocols like OHAI.

-Tiru


>
> When it comes to JWE modes, stuff either is or is not, there is no
> "similar".
>
>
>
>
> -Ilari
>
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