Web/API/PublicKeyCredentialCreationOptions/pubKeyCredParams

Secure contextThis feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The pubKeyCredParams property of the PublicKeyCredentialCreationOptions dictionary is an Array whose elements are objects describing the desired features of the credential to be created. These objects define the type of public-key and the algorithm used for cryptographic signature operations.

If this array contains multiple elements, they are sorted by descending order of preference.

Syntax

pubKeyCredParams = publicKeyCredentialCreationOptions.pubKeyCredParams

Value

An Array whose elements are objects with the following properties:

type: A string describing type of public-key credential to be created. As of this writing (March 2019), only "public-key" may be used.
alg: A numeric identifier for the algorithm to be used to generate the key pair. The links between identifier and algorithms are defined in this IANA registry (e.g. -7 indicates the elliptic curve algorithm ECDSA with SHA-256).

Though those elements are sorted by preference (the first element being the most prefered), it is up to the client to choose among those elements for building the credential.

Examples

var publicKey = {
  pubKeyCredParams: [
    // We would like an elliptic curve to be used if possible
    {
      type: "public-key",
      alg: -7
    },
    // If not, then we will fallback on an RSA algorithm
    {
      type: "public-key",
      alg: -37
    }
  ],
  challenge: new Uint8Array(26) /* this actually is given from the server */,
  rp: {
    name: "Example CORP",
    id  : "login.example.com"
  },
  user: {
    id: new Uint8Array(26), /* To be changed for each user */
    name: "[email protected]",
    displayName: "John Doe",
  }
};

navigator.credentials.create({ publicKey })
  .then(function (newCredentialInfo) {
    // send attestation response and client extensions
    // to the server to proceed with the registration
    // of the credential
  }).catch(function (err) {
     console.error(err);
  });

Specifications

Specification	Status	Comment
Web Authentication: An API for accessing Public Key Credentials Level 1The definition of 'pubKeyCredParams' in that specification.	Recommendation	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`pubKeyCredParams` Experimental'	Chrome Full support 67	Edge Full support ≤79	Firefox Full support 60	IE No support No	Opera Full support 54	Safari Full support 13	WebView Android No support No	Chrome Android Full support 67	Firefox Android ?	Opera Android Full support 48	Safari iOS Full support 13.3	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.