biometric_storage

Encrypted file store, optionally secured by biometric lock for Android, iOS and MacOS.

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.

On android uses androidx uses KeyStore and on iOS LocalAuthentication with KeyChain.

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

Versions

• Use 0.2.x for legacy plugin format for iOS and android support.
• Use 0.3.x-beta for the new platforms pubspec format which also supports mac OS.

Getting Started

Android

• Requirements:
  • Android: API Level >= 23
  • MainActivity must extend FlutterFragmentActivity
  • Theme for the main activity must use Theme.AppCompat thme. (Otherwise there will be crases on Android < 29) For example:AndroidManifest.xml:<activity android:name=”.MainActivity” android:launchMode=”singleTop” android:theme=”@style/LaunchTheme”xml/styles.xml: <style name=”LaunchTheme” parent=”Theme.AppCompat.NoActionBar”> <!– Show a splash screen on the activity. Automatically removed when Flutter draws its first frame –> <item name=”android:windowBackground”>@drawable/launch_background</item> <item name=”android:windowNoTitle”>true</item> <item name=”android:windowActionBar”>false</item> <item name=”android:windowFullscreen”>true</item> <item name=”android:windowContentOverlay”>@null</item> </style>

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
• Requires at least iOS 9

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.
• Requires at least Mac OS 10.12

Resources

• https://developer.android.com/topic/security/data
• https://developer.android.com/topic/security/best-practices

Download biometric authentication source code on GitHub

https://github.com/authpass/biometric_storage