Registration Implementation for Passkeys

Registration.swift

func signUpWith(userName: String, anchor: ASPresentationAnchor) {
    self.authenticationAnchor = anchor
    let publicKeyCredentialProvider = ASAuthorizationPlatformPublicKeyCredentialProvider(relyingPartyIdentifier: domain)

    // Fetch the challenge from the server. The challenge needs to be unique for each request.
    // The userID is the identifier for the user's account.
    let challenge = Data()
    let userID = Data(UUID().uuidString.utf8)

    let registrationRequest = publicKeyCredentialProvider.createCredentialRegistrationRequest(challenge: challenge,
                                                                                              name: userName, userID: userID)

    // Use only ASAuthorizationPlatformPublicKeyCredentialRegistrationRequests or
    // ASAuthorizationSecurityKeyPublicKeyCredentialRegistrationRequests here.
    let authController = ASAuthorizationController(authorizationRequests: [ registrationRequest ] )
    authController.delegate = self
    authController.presentationContextProvider = self
    authController.performRequests()
    isPerformingModalReqest = true
}