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Re: [CFRG] HPKE and Key Wrapping

Russ Housley <housley@vigilsec.com> Tue, 29 March 2022 14:00 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Tue, 29 Mar 2022 10:00:02 -0400
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To: John Mattsson <john.mattsson=40ericsson.com@dmarc.ietf.org>
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Subject: Re: [CFRG] HPKE and Key Wrapping
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Indeed.  This is exactly the use that is moving forward in draft-ietf-cose-hpke, and CFRG review would be greatly appreciated.

Russ

> On Mar 29, 2022, at 5:05 AM, John Mattsson <john.mattsson=40ericsson.com@dmarc.ietf.org> wrote:
> 
> Hi,
>  
> Dan Harkins draft and presentation made me think about HPKE and key wrapping.
> https://datatracker.ietf.org/doc/html/draft-harkins-cfrg-dnhpke-01 <https://datatracker.ietf.org/doc/html/draft-harkins-cfrg-dnhpke-01>
>  
> AES-SIV could be used for this, but the algorithms currently approved by NIST for key wrapping are AES-KW and AES-KWP.
>  
> https://datatracker.ietf.org/doc/html/rfc3394 <https://datatracker.ietf.org/doc/html/rfc3394>
> https://datatracker.ietf.org/doc/html/rfc5649 <https://datatracker.ietf.org/doc/html/rfc5649>
> https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-38F.pdf <https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-38F.pdf>
>  
> For asymmetric key wrapping. AES-KWP is often used with RSA-OAEP (which NIST calls KTS-OAEP: Key-Transport Using RSA-OAEP in SP 800-56Br2).
>  
> https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Br2.pdf <https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Br2.pdf>
> https://cloud.google.com/kms/docs/key-wrapping <https://cloud.google.com/kms/docs/key-wrapping>
> https://microsoft.github.io/CCF/release/1.x/js/ccf-app/interfaces/global.rsaoaepaeskwpparams.html <https://microsoft.github.io/CCF/release/1.x/js/ccf-app/interfaces/global.rsaoaepaeskwpparams.html>
>  
> I think HPKE is the future of asymmetric encryption including asymmetric key wrapping.
>  
> Would it make sense to standardize AES-KWP for HPKE or do CFRG believe that AES-SIV is the future of key wrapping? Irrespectively I think the CFRF should produce a good recommendation on how to use HPKE for key wrapping.
>  
> Cheers,
> John
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