A Client-side discoverable Public Key Credential Source, or Discoverable Credential for short,is a public key credential source that is discoverable and usable in authentication ceremonies where the Relying Party does not provide any credential IDs,i.e., the Relying Party invokes navigator.credentials.get() with an empty allowCredentials argument. This means that the Relying Party does not necessarily need to first identify the user.
This internal slot contains the results of processing client extensions requested by the Relying Party upon the Relying Party's invocation of either navigator.credentials.create() or navigator.credentials.get().
Sql Navigator 67 Serial Key
This attribute contains a JSON-compatible serialization of the client data, the hash of which is passed to theauthenticator by the client in its call to either create() or get() (i.e., the client data itself is not sent to the authenticator).
The serialization of the CollectedClientData is a subset of the algorithm for JSON-serializing to bytes. I.e. it produces a valid JSON encoding of the CollectedClientData but also provides additional structure that may be exploited by verifiers to avoid integrating a full JSON parser. While verifiers are recommended to perform standard JSON parsing, they may use the more limited algorithm below in contexts where a full JSON parser is too large. This verification algorithm requires only base64url encoding, appending of bytestrings (which could be implemented by writing into a fixed template), and three conditional checks (assuming that inputs are known not to need escaping).
In order to remain compatible with the limited verification algorithm, future versions of this specification must not remove any of the fields type, challenge, origin, or crossOrigin from CollectedClientData. They also must not change the serialization algorithm to change the order in which those fields are serialized.
A Document's permissions policy determines whether any content in that document is allowed to successfully invoke the Web Authentication API, i.e., via navigator.credentials.get(publicKey:..., ...).If disabled in any document, no content in the document will be allowed to use the foregoing methods: attempting to do so will return an error.
The primary function of the authenticator is to provide WebAuthn signatures, which are bound to various contextual data. Thesedata are observed and added at different levels of the stack as a signature request passes from the server to theauthenticator. In verifying a signature, the server checks these bindings against expected values. These contextual bindingsare divided in two: Those added by the Relying Party or the client, referred to as client data; and those added by the authenticator,referred to as the authenticator data. The authenticator signs over the client data, but is otherwise not interested inits contents. To save bandwidth and processing requirements on the authenticator, the client hashes the client data andsends only the result to the authenticator. The authenticator signs over the combination of the hash of the serialized client data, and its own authenticator data.
The format for assertion signatures, which sign over the concatenation of an authenticator data structure and the hashof the serialized client data, are compatible with the FIDO U2F authentication signature format (see Section 5.4 of [FIDO-U2F-Message-Formats]).
This is because the first 37 bytes of the signed data in a FIDO U2F authentication response message constitute a valid authenticator data structure, and the remaining 32 bytes are the hash of the serialized client data. In this authenticator data structure, the rpIdHash is the FIDO U2F application parameter, all flags except UP are always zero, and the attestedCredentialData and extensions are never present. FIDO U2F authentication signatures can therefore be verified bythe same procedure as other assertion signatures generated by the authenticatorMakeCredential operation.
Let signature be the assertion signature of the concatenation authenticatorData hash using the privateKey of selectedCredential as shown in Figure , below. A simple,undelimitedconcatenation is safe to use here because the authenticator data describes its own length. The hash of the serializedclient data (which potentially has a variable length) is always the last element.
Signing procedure:The signing procedure for computing an attestation statement in this format giventhe public key credential to be attested, the authenticator data structure containing the authenticator datafor the attestation, and the hash of the serialized client data.
If the credential public key of the attested credential is not of algorithm -7 ("ES256"), stop and return an error.Otherwise, let authenticatorData denote the authenticator data for the attestation,and let clientDataHash denote the hash of the serialized client data. (Since SHA-256 is used to hash theserialized client data, clientDataHash will be 32 bytes long.)
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