PublicKeyCredentialCreationOptions.pubKeyCredParams
Secure context
This 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 preferred), 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: "jdoe@example.com",
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 1 The definition of 'pubKeyCredParams' in that specification. |
Recommendation | Initial definition. |
Browser compatibility
BCD tables only load in the browser
See also
- The IANA COSE
Algorithms registry which describes the cryptographic algorithms and their
corresponding identifier (used as the
"alg"
key here)