AuthenticatorAssertionResponse: signature property

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This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨September 2021⁩.

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The signature read-only property of the AuthenticatorAssertionResponse interface is an ArrayBuffer object which is the signature of the authenticator for both AuthenticatorAssertionResponse.authenticatorData and a SHA-256 hash of the client data (AuthenticatorAssertionResponse.clientDataJSON).

This signature will be sent to the server for control, as part of the response. It provides the proof that an authenticator does possess the private key which was used for the credential's generation.

Value

An ArrayBuffer object which the signature of the authenticator (using its private key) for both AuthenticatorAssertionResponse.authenticatorData and a SHA-256 hash given by the client for its data (the challenge, the origin, etc. and available from AuthenticatorAssertionResponse.clientDataJSON).

Examples

See Retrieving a public key credential for a detailed example.

Specifications

Browser compatibility