AuthenticatorAttestationResponse.attestationObject

As part of the WebAuthn create() call, an authenticator will create a new keypair as well as an attestationObject for that keypair. The attestationObject contains the new public key, as well as signature over the entire attestationObject with a private key that is stored in the authenticator when it is manufactured. The public key that corresponds to the private key that has created the attestation signature is well known; however, there are various well known attestation public key chains for different ecosystems (for example, Android or TPM attestations).

Syntax

TBD

Properties

After decoding the CBOR encoded ArrayBuffer, the resulting JavaScript object will contain the following properties:

authenticatorData

The same as AuthenticatorAssertionResponse.authenticatorData. Note that in AuthenticatorAssertionResponse the authenticatorData is exposed as a property in a JavaScript Object. In AuthenticatorAttestationResponse the authenticatorData is a property in a CBOR map.

(The same authenticator data field is used by both AuthenticatorAttestationResponse and by AuthenticatorAssertionResponse. When used in attestation, it contains an optional field, attestedCredentialData. This field is not included when used in the AuthenticatorAssertionResponse. The attestedCredentialData field contains the credentialId and credentialPublicKey.)

fmt

A text string that indicates the format of the attStmt. The WebAuthn specification defines a number of formats; however, formats may also be defined in other specifications and registered in an IANA registry. Formats defined by WebAuthn are: "packed", "tpm", "android-key", "android-safetynet", "fido-u2f", and "none".

attStmt

A an attestation statement that is of the format defined by "fmt". For now, see the WebAuthn specification for details on each format.

Examples

TBD

Specifications

Browser compatibilityUpdate compatibility data on GitHub