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Clarify validation step for packed attestation certificate for RPs. #2000

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Nov 29, 2023
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Clarify validation step for packed attestation certificate for RPs. #2000

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Clarify validation step for packed attestation certificate for RPs. A…
sbweeden Nov 22, 2023
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Update index.bs
sbweeden Nov 29, 2023
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4 changes: 3 additions & 1 deletion index.bs
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Expand Up @@ -5888,7 +5888,9 @@ The attestation certificate MUST have the following fields/extensions:

- If the related attestation root certificate is used for multiple authenticator models, the Extension OID
`1.3.6.1.4.1.45724.1.1.4` (`id-fido-gen-ce-aaguid`) MUST be present, containing the AAGUID as a 16-byte OCTET STRING.
The extension MUST NOT be marked as critical.
The extension MUST NOT be marked as critical. As [=Relying Parties=] may not know if the attestation root
certificate is used for multiple authenticator models, it is suggested that [=Relying Parties=] check if the extension
is present, and if it is, then validate that it contains that same AAGUID as presented in the [=attestation object=].
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Note that an X.509 Extension encodes the DER-encoding of the value in an OCTET STRING.
Thus, the AAGUID MUST be wrapped in <i>two</i> OCTET STRINGS to be valid. Here is a sample, encoded Extension structure:
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