test(ctap2): verify signature round-trip#280
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…icator Register with hmac-secret, then check the assertion signature against the credential public key and the packed attestation signature against the embedded certificate, recomputing the client data hash from clientDataJSON.
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The end-to-end tests drove full ceremonies but never verified a signature, so a regression in the emitted bytes could pass unnoticed. This adds a round-trip test against the virtual authenticator that verifies an assertion signature and a packed attestation signature, including an extension that writes into the signed data.
Part of #259.