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Rename the CMTG key extension from cmtgKey to cmtgKeys and make its client output a sequence<AuthenticationExtensionsCmtgKeyOutputs>. The authenticator extension output and unsigned extension output become index-matched CBOR arrays. Authenticators currently MUST return exactly one entry, and Relying Parties MUST treat an output with more than one entry as invalid. The list format leaves room for future extensions, such as algorithm transitions (w3c#2417), to return more than one key. Clients fail the operation with an "UnknownError" if the outputs are malformed or have mismatched lengths, since the signed keys cannot be removed from the authenticator data. Also rename the CMTG section IDs and update the explainer. Fixes w3c#2472
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Rename the CMTG key extension from cmtgKey to cmtgKeys and make its client output a
sequence<AuthenticationExtensionsCmtgKeyOutputs>. The authenticator extension output and unsigned extension output become index-matched CBOR arrays.Authenticators currently MUST return exactly one entry, and Relying Parties MUST treat an output with more than one entry as invalid. The list format leaves room for future extensions, such as algorithm transitions (#2417), to return more than one key.
Also rename the CMTG section IDs and update the explainer.
Closes #2472
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