Orchestration SDK – PIN-Change Integration

Hakim Aldaoub, March 30, 2021

When integrating the Orchestration SDK to your mobile application, you sign-up for the numerous features that enhance the security of your application. Allowing your end-user to change their PIN securely on their mobile app is one of these features. In today’s blog, we will explore the Change PIN activity with a sample code empowered by OneSpan’s Orchestration SDK and the different possible flows when implementing the ChangePINCallback.

Prerequisites:

Note: the PIN could be referred to as Password in the sample application. Through this tutorial, our sample code will only use the PIN terminology.

Note: all commands are exchanged and interpreted explicitly between the TID platform and the client application server through the orchestration-commands/ endpoint.

Changing the PIN Process

The end-user triggers the process to change the old PIN on their trusted device from their mobile application, which integrates the Orchestration SDK. The mobile application will be required to implement the ChangePINCallback and override its methods as we will discuss in details below.

Orchestrator builder and Client Device Data Collector (CDDC)

The OrchestrationCallback object will be created with the current Context, which will be passed to the OrchestrationCallback as an argument, referenced with the this keyword. Afterwards, an object of the inner Builder class of the Orchestrator class will be created. The purpose of the Builder object is to create an Orchestrator object following the concept of the Builder design pattern, as seen below.

// Orchestration
private Orchestrator orchestrator;
private String userIdentifier;
@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_change_PIN);

    Toolbar toolbar = findViewById(R.id.toolbar);

    setSupportActionBar(toolbar);
    // Get orchestrator instance

    orchestrationCallback = new SampleOrchestrationCallback(this);

    Orchestrator.Builder builder = new Orchestrator.Builder();

    orchestrator = builder

            .setDigipassSalt(Constants.SALT_DIGIPASS)

            .setStorageSalt(Constants.SALT_STORAGE)

            .setContext(getApplicationContext())

            .setDefaultDomain(Constants.DOMAIN)

            .setCDDCParams(CDDCUtils.getCDDCParams())

            .setErrorCallback(orchestrationCallback)

            .setWarningCallback(orchestrationCallback)

            .build();

    // Set values for the CDDC when available
    CDDCUtils.configure(orchestrator.getCDDCDataFeeder()); 

Before invoking the build method to complete the creation of the Orchestrator object, the following arguments should be defined as shown in the code above:

  • Hardcoded salts, which will be used for diversification with certain security features (e.g. device binding, secure storage). These salts will be derived by the Orchestration SDK Client to complicate reverse-engineering attacks.
  • Default domain, required if the Customer Application Server integrates OneSpan Authentication Server. If the Customer Mobile Application must manage multiple domains, the default domain can be dynamically overwritten for each action (e.g. startActivation.
  • A CDDCParams object, which will define the parameters for device data collection. These parameters are optional.
  • An OrchestrationErrorCallback object, in case of errors, will be used to throw them from the Orchestration SDK Client to the Customer Mobile Application.
  • An OrchestrationWarningCallback object, in case of warnings, will be used to throw them from the Orchestration SDK Client to the Customer Mobile Application.
  • After the Orchestrator object is built successfully, the static configure method of the CDDCUtilsclass will be called to set up the values for the CDDC data from the orchestrator.getCDDCDataFeeder()

Changing PIN parameters

In the process of changing the PIN, the parameters will be set in onStartChangePIN() method. This method takes a View object as an argument to display a message to the end-user telling them that their request is in progress. Afterward, the orchestrator object will set the authentication method required to changes the PIN, and the keypad will be used for capturing the PIN. This keypad could be the default provided in the Orcherstration SDK or a custom keypad developed by the customer.

In the next step, ChangePINParams object will be initialized. The OrchestrationUser and the current ChangePINActivity will be provided as parameters along with the index of the cryptographic application, which is used to sign the authentication request. After that, the Orchestrator will call the startChangePIN() method passing all the necessary parameters to change the PIN.


public void onStartChangePIN(View view) {

    // Display progress dialog and start PIN changing
    progressDialog = UIUtils.displayProgress(this, getString(R.string.dialog_progress_change_pwd));

    orchestrationCallback.setProgressDialog(progressDialog);

    // Used for custom PIN instead of default one
    orchestrator.setUserAuthenticationCallback(orchestrationCallback, new UserAuthenticationCallback.UserAuthentication[]{UserAuthenticationCallback.UserAuthentication.PIN});

    // Initializing params
    ChangePINParams PINParams = new ChangePINParams();

    PINParams.setOrchestrationUser(new OrchestrationUser(userIdentifier));

    PINParams.setChangePINCallback(ChangePINActivity.this);

    PINParams.setCryptoAppIndex(CryptoAppIndex.SECOND);

    orchestrator.startChangePIN(PINParams);

}

To be ready for all possible scenarios, the Orchestration SDK requires the client application to override all the ChangePINCallback methods. It starts with the onChangePINStepComplete which has the CommandSender object to communicate with the TID platform, and it receives an orchestration command as a parameter which will be sent later to the server.

In the CommandSender object, there are two callback methods to be defined in this step. The onCommandSendingSuccess() which will be run to execute the upcoming server command on the phone in case of a successful reception. In addition, there is the onCommandSendingFailure() which will be executed in case of any failure. Below is the sample code for onChangePINStepComplete method.


@Override

public void onChangePINStepComplete(String command) {

    CommandSender commandSender = new CommandSender(getApplicationContext(), new CommandSenderCallback() {

        @Override

        public void onCommandSendingSuccess(String serverCommand) {

            orchestrator.execute(serverCommand);

        }
        @Override

        public void onCommandSendingFailure() {

            // Hide progress dialog and display error message

            UIUtils.hideProgress(progressDialog);

            UIUtils.displayAlert(ChangePINActivity.this, getString(R.string.dialog_error_title), getString(R.string.dialog_error_content_sending));
        }

    });
    commandSender.execute(command);

}

The rest of the methods of the ChangePINCallback are below with their description:

  • onChangePINSuccess: it will be called after a successful PIN reset and display to the end-user the message provided to UIUtils.displayAlert() method.
  • onChangePINAborted: it will be called if the PIN change has been aborted and will convey the message to the end-user.
  • onChangePINInputError: it will be called if an error occurs during the change PIN process due to incorrect user input. The possible errors are listed in the OrchestrationErrorCodesclass.

@Override

public void onChangePINSuccess() {

    UIUtils.hideProgress(progressDialog);

    UIUtils.displayAlert(this, getString(R.string.dialog_title_change_PIN), getString(R.string.dialog_content_change_PIN_success));

}

@Override

public void onChangePINAborted() {

    UIUtils.hideProgress(progressDialog);

    UIUtils.displayAlert(this, getString(R.string.dialog_title_change_PIN), getString(R.string.dialog_content_change_PIN_abortion));

}

@Override

public void onChangePINInputError(PINError error) {

    UIUtils.hideProgress(progressDialog);

    UIUtils.displayAlert(this, getString(R.string.dialog_error_title), ErrorUtils.getErrorMessage(this, error.getErrorCode()));

}

This concludes the tutorial on how to utilize the Orchestration SKD to integrate the PIN change feature to your mobile application. If you have any questions, reach out to us on the OneSpan Forums.

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