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Re: [Dcrup] draft-ietf-dcrup-dkim-crypto-00

Russ Housley <housley@vigilsec.com> Fri, 19 May 2017 18:18 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Fri, 19 May 2017 14:18:02 -0400
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Subject: Re: [Dcrup] draft-ietf-dcrup-dkim-crypto-00
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> On May 19, 2017, at 1:36 PM, Salz, Rich <rsalz@akamai.com> wrote:
> 
>> Given how short they both are, I'd like to keep them together for now.
> 
> Ok.
> 
> Speaking as an individual, I'd like to emphasize what Mark said.  ECDH is a key exchange protocol, not a signing protocol.  For elliptic curve signatures, the document should use https://datatracker.ietf.org/doc/draft-ietf-curdle-cms-eddsa-signatures/ which is now in IESG last call.  Note that the hash mechanism is implicit in the signature algorithm.

I can make argument for both Ed25519 and ECDSA P256 with SHA-256.  I know that the second one is widely available via OpenSSL.

Russ

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