(Android™) Windows Credentials Manager - AutoSplit Larger Secrets

See more Secrets Examples

Secrets stored in the Windows Credentials Manager can be a maximum of 2560 bytes in size. If the content of the secret is too large for the Windows Credential Manager, Chilkat will automatically split the secret into parts and store a shorter JSON manifest.

Note: This example requires Chilkat v10.1.0 or later.

For more information, see https://cknotes.com/chilkat-secrets-class-added-in-version-10-1-0/

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSecrets secrets = new CkSecrets();

    // The default value of AutoSplit is true.
    // Note: AutoSplit only applies when the secret location is "local_manager"
    // and the app is running on the Windows OS.  All other secret locations, such as Apple Keychain,
    // AWS Secrets Manager, Azure Key Vault, etc. don't have limitations that are so small.
    secrets.put_AutoSplit(true);

    // On Windows, this is the Windows Credentials Manager
    // On MacOS/iOS, it is the Apple Keychain
    // (This example is explaining how a secret too large for the Windows Credential Manager
    // is automatically compressed and split into parts if needed.)
    secrets.put_Location("local_manager");

    // Specify the name of the secret.
    // service and username are required.
    // appName and domain are optional.
    // Note: The values are arbitrary and can be anything you want.
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("appName","AA_MyApp");
    json.UpdateString("service","OAuth2");
    json.UpdateString("domain","onedrive");
    json.UpdateString("username","matt");

    // Get the secret to be stored.
    CkJsonObject jsonSecret = new CkJsonObject();
    boolean success = jsonSecret.LoadFile("qa_data/tokens/oneDrive.json");
    if (success == false) {
        Log.i(TAG, jsonSecret.lastErrorText());
        return;
        }

    // Note: The oneDrive.json file we used for testing is 4824 bytes in size,
    // which exceeds the maximum size (2560 bytes) allowed by the Windows Credentials Manager.

    // When the size is too large, Chilkat will first compress the content of the secret.
    // If the compressed size is small enough, then it is stored compressed without splitting.
    // Otherwise the compressed data is split

    // Your application does not need to know how the secret is stored in the Windows Credentials Manager.
    // When fetching the secret, Chilkat automatically decompresses and re-composes from parts.

    // Create or update the secret.
    success = secrets.UpdateSecretJson(json,jsonSecret);
    if (success == false) {
        Log.i(TAG, secrets.lastErrorText());
        return;
        }

    // This is the auto-split secret viewed in the Windows Credentials Manager:
    // 

    // Note: If you delete the auto-split secret by calling Chilkat's DeleteSecret method,
    // the parts are automatically deleted.
    // Also, if you update the secret, the old parts are automatically deleted and new parts are created.

    Log.i(TAG, "Success");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}