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Re: [webauthn] daaKey format? (ECPointToB -> ECPoint2ToB)

From: sjparkRaon via GitHub <sysbot+gh@w3.org>
Date: Wed, 22 Mar 2017 04:31:55 +0000
To: public-webauthn@w3.org
Message-ID: <issue_comment.created-288295991-1490157114-sysbot+gh@w3.org>
Yes, I understand your comment.

I am waiting for final specification.

 

Thank you for your guide.

 

From: Rolf Lindemann [mailto:notifications@github.com] 
Sent: Tuesday, March 21, 2017 8:12 PM
To: w3c/webauthn
Cc: sjparkRaon; Author
Subject: Re: [w3c/webauthn] daaKey format? (ECPointToB -> ECPoint2ToB) (#385)

 

I think we have two options here
a) directly encoding the full ECDAA Issuer public key here, in this case it would be ECPoint2ToB result or
b) use the c value of the public key (as defined in section 3.3 step 3.5) in which case it would be the result of BigNumberToB.

using b) is shorter (less bytes) and avoids accidentally "forgetting" to verify the ECDAA Issuer public key to the trust store. So I prefer option b at this time - other opinions welcome.

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Received on Wednesday, 22 March 2017 04:32:02 UTC

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