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Secure Storage: Encrypted data store optionally secured by biometric lock with support for iOS, Android, MacOS. Partial support for Linux, Windows and web (localStorage).

biometric_storage #

Pub

Encrypted file store, optionally secured by biometric lock for Android, iOS, MacOS and partial support for Linux, Windows and Web.

Meant as a way to store small data in a hardware encrypted fashion. E.g. to store passwords, secret keys, etc. but not massive amounts of data.

  • Android: Uses androidx with KeyStore.
  • iOS and MacOS: LocalAuthentication with KeyChain.
  • Linux: Stores values in Keyring using libsecret. (No biometric authentication support).
  • Windows: Uses wincreds.h to store into read/write into credential store.
  • Web: Warning Uses unauthenticated, unencrypted storage in localStorage. If you have a better idea for secure storage on web platform, please open an Issue.

Check out AuthPass Password Manager for a app which makes heavy use of this plugin.

Getting Started #

Installation #

Android

  • Requirements:
    • Android: API Level >= 23 (android/app/build.gradle minSdkVersion 23)

    • Make sure to use the latest kotlin version:

      • android/build.gradle: ext.kotlin_version = '1.4.31'
    • MainActivity must extend FlutterFragmentActivity

    • Theme for the main activity must use Theme.AppCompat thme. (Otherwise there will be crashes on Android < 29) For example:

      android/app/src/main/AndroidManifest.xml:

      <activity
          android:name=".MainActivity"
          android:launchMode="singleTop"
          android:theme="@style/LaunchTheme">
          [...]
          <meta-data
                android:name="io.flutter.embedding.android.NormalTheme"
                android:resource="@style/NormalTheme"
                />
      </activity>
      

      android/app/src/main/res/values/styles.xml:

      <resources>
        <style name="LaunchTheme" parent="Theme.AppCompat.NoActionBar">
          ...
        </style>
        <style name="NormalTheme" parent="Theme.AppCompat.NoActionBar">
          ...
        </style>
      </resources>
      
Resources

iOS

https://developer.apple.com/documentation/localauthentication/logging_a_user_into_your_app_with_face_id_or_touch_id

  • include the NSFaceIDUsageDescription key in your app’s Info.plist file
  • Supports all iOS versions supported by Flutter. (ie. iOS 12)

Known Issue: since iOS 15 the simulator seem to no longer support local authentication: https://developer.apple.com/forums/thread/685773

Mac OS

  • include the NSFaceIDUsageDescription key in your app’s Info.plist file
  • enable keychain sharing and signing. (not sure why this is required. but without it You will probably see an error like:

    SecurityError, Error while writing data: -34018: A required entitlement isn't present.

  • Supports all MacOS Versions supported by Flutter (ie. >= MacOS 10.14)

Usage #

You basically only need 4 methods.

  1. Check whether biometric authentication is supported by the device
  final response = await BiometricStorage().canAuthenticate()
  if (response != CanAuthenticateResponse.success) {
    // panic..
  }
  1. Create the access object
  final store = BiometricStorage().getStorage('mystorage');
  1. Read data
  final data = await storageFile.read();
  1. Write data
  final myNewData = 'Hello World';
  await storageFile.write(myNewData);

See also the API documentation: https://pub.dev/documentation/biometric_storage/latest/biometric_storage/BiometricStorageFile-class.html#instance-methods

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Publisher

verified publishercodeux.design

Secure Storage: Encrypted data store optionally secured by biometric lock with support for iOS, Android, MacOS. Partial support for Linux, Windows and web (localStorage).

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Topics

#biometrics #encryption #storage #security #secure-storage

License

unknown (license)

Dependencies

ffi, flutter, flutter_web_plugins, logging, plugin_platform_interface, web, win32

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