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

"Salz, Rich" <rsalz@akamai.com> Fri, 19 May 2017 17:36 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: John Levine <johnl@taugh.com>, "dcrup@ietf.org" <dcrup@ietf.org>
Thread-Topic: [Dcrup] draft-ietf-dcrup-dkim-crypto-00
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Date: Fri, 19 May 2017 17:36:29 +0000
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Subject: Re: [Dcrup] draft-ietf-dcrup-dkim-crypto-00
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> 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.

The key fingerprint needs more clarification.  For 25519 keys, there is a "natural and obvious" byte representation, but for RSA keys what is  being fingerprinted?  The DER OCTET STRING?

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