Re: [webauthn] Account for new fully-specified ECDSA and Ed448 COSEAlgorithmIdentifiers (#2283)

> COSE does not allow encoding ESP* keys with the OKP type. ECDSA public keys are required to use the EC2 key type

Indeed. Thanks for the correction. I assumed the reason the OKP parameter for the public key was called `x` was for curves like P-256 since the compressed point is represented as the x-coordinate with the y-coordinate parity bit; in contrast to curves like ed25519 whose points are encoded as the y-coordinate with the x-coordinate parity bit thus `y` would be the more appropriate parameter name. That's what I get for not re-reading RFC 9053.

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Received on Wednesday, 21 May 2025 14:03:07 UTC