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A flutter plugin for secure storage on Android via KeyStore and iOS via Keychain

License: Other

Kotlin 52.90% Ruby 11.93% Swift 1.66% Objective-C 16.92% Dart 14.21% Shell 2.38%

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flutter_keychain's Issues

The plugin `flutter_keychain` uses a deprecated version of the Android embedding

The plugin flutter_keychain uses a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to see if this plugin supports the Android V2 embedding. Otherwise, consider removing it since a future release of Flutter will remove these deprecated APIs.
Please update new version to fix it. Thanks

Emulator 5.0 & 5.1: Suppressed: java.lang.ClassNotFoundException: android.security.keystore.KeyGenParameterSpec$Builder

First, let me thank you for this library: great job!

One issue I have is this:
Looks like it does not work on 5.0 & 5.1 emulator (not sure about real devices) because of a suppressed class?
Suppressed: java.lang.ClassNotFoundException: android.security.keystore.KeyGenParameterSpec$Builder

I checked the Android Studio project folder of my Flutter app:
minSdkVersion 21
which is Android Lollipop (5.0)

I then dug into the code and found out that some code is commented in
C:\Users\<username>\flutter.pub-cache\hosted\pub.dartlang.org\flutter_keychain-1.0.0\android\src\main\kotlin\be\appmire\flutterkeychain\FlutterKeychainPlugin.kt

I uncommented and it seems to be working fine now.

Can you please fix or explain this?

Thanks

//    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
//
//      spec = android.security.KeyPairGeneratorSpec.Builder( context)
//              .setAlias(keyAlias)
//              .setSubject(X500Principal("CN=$keyAlias"))
//              .setSerialNumber(BigInteger.valueOf(1))
//              .setStartDate(start.time)
//              .setEndDate(end.time)
//              .build()
//    } else {
        spec = KeyGenParameterSpec.Builder(keyAlias, KeyProperties.PURPOSE_DECRYPT or KeyProperties.PURPOSE_ENCRYPT)
                .setCertificateSubject(X500Principal("CN=$keyAlias"))
                .setDigests(KeyProperties.DIGEST_SHA256)
                .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_PKCS1)
                .setUserAuthenticationRequired(false)
                .setCertificateSerialNumber(BigInteger.valueOf(1))
                .setCertificateNotBefore(start.time)
                .setCertificateNotAfter(end.time)
                .build()
//    }

FYI, Stack trace with comment on (Android 5.x)

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.mytestapp, PID: 3910
    java.lang.NoClassDefFoundError: Failed resolution of: Landroid/security/keystore/KeyGenParameterSpec$Builder;
        at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createKeys(FlutterKeychainPlugin.kt:156)
        at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createRSAKeysIfNeeded(FlutterKeychainPlugin.kt:123)
        at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.<init>(FlutterKeychainPlugin.kt:48)
        at be.appmire.flutterkeychain.FlutterKeychainPlugin$Companion.registerWith(FlutterKeychainPlugin.kt:280)
        at be.appmire.flutterkeychain.FlutterKeychainPlugin.registerWith(FlutterKeychainPlugin.kt)
        at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:15)
        at com.mytestapp.MainActivity.onCreate(MainActivity.java:11)
        at android.app.Activity.performCreate(Activity.java:5937)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
        at android.app.ActivityThread.access$800(ActivityThread.java:144)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.security.keystore.KeyGenParameterSpec$Builder" on path: DexPathList[[zip file "/data/app/com.mytestapp-1/base.apk"],nativeLibraryDirectories=[/data/app/com.mytestapp-1/lib/x86, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
        at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createKeys(FlutterKeychainPlugin.kt:156) 
        at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createRSAKeysIfNeeded(FlutterKeychainPlugin.kt:123) 
        at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.<init>(FlutterKeychainPlugin.kt:48) 
        at be.appmire.flutterkeychain.FlutterKeychainPlugin$Companion.registerWith(FlutterKeychainPlugin.kt:280) 
        at be.appmire.flutterkeychain.FlutterKeychainPlugin.registerWith(FlutterKeychainPlugin.kt) 
        at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:15) 
        at com.mytestapp.MainActivity.onCreate(MainActivity.java:11) 
        at android.app.Activity.performCreate(Activity.java:5937) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
        at android.app.ActivityThread.access$800(ActivityThread.java:144) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:135) 
        at android.app.ActivityThread.main(ActivityThread.java:5221) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at java.lang.reflect.Method.invoke(Method.java:372) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
    	Suppressed: java.lang.ClassNotFoundException: android.security.keystore.KeyGenParameterSpec$Builder
        at java.lang.Class.classForName(Native Method)
        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        		... 21 more
     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

Kotlin version

The Android Gradle plugin supports only Kotlin Gradle plugin version 1.2.51 and higher. Project 'flutter_keychain' is using version 1.2.30.

No Support for Web

It seems flutter_keychain has no support for web.

Cipher functions:OPENSSL_internal:BAD_DECRYPT

Sometimes getting this error:

E/flutter_keychain(29852): error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): Failed to handle method call
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): java.lang.IllegalArgumentException: Unsupported value: javax.crypto.BadPaddingException: error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at io.flutter.plugin.common.StandardMessageCodec.writeValue(StandardMessageCodec.java:293)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at io.flutter.plugin.common.StandardMethodCodec.encodeErrorEnvelope(StandardMethodCodec.java:70)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.error(MethodChannel.java:208)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at be.appmire.flutterkeychain.FlutterKeychainPlugin.onMethodCall(FlutterKeychainPlugin.kt:323)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:200)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at io.flutter.view.FlutterNativeView.handlePlatformMessage(FlutterNativeView.java:163)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at android.os.MessageQueue.next(MessageQueue.java:325)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at android.os.Looper.loop(Looper.java:142)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at android.app.ActivityThread.main(ActivityThread.java:6541)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
E/MethodChannel#plugin.appmire.be/flutter_keychain(29852): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
D/        (29852): HostConnection::get() New Host Connection established 0x724a7ce36680, tid 29895
D/EGL_emulation(29852): eglMakeCurrent: 0x724a95fa1c80: ver 3 0 (tinfo 0x724a8c40d540)
I/flutter (29852): Caught error: PlatformException(error, Unsupported value: javax.crypto.BadPaddingException: error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT, null)

It happens in the emulator normally after an app crash. I have to then clear the data from the app and login again to the application (which imports the data into the keychain again).

Any ideas?

adding support for macOS

Few plugins already added macOS support

url_launcher
shared_preferences
connectivity
path_provider

This plugin need support too
https://flutter.dev/desktop

MissingPluginException

Hi,
I'm running into a few of these exceptions using workmanager (spawns a background isolate to do work).
Can you provide an api endpoint to register the plugin under those circumstances ? Thanks !

iOS: Xcode 15 runtime error: dyld[2683]: Symbol not found: _OBJC_CLASS_$_NSObject

Steps to reproduce:

create an empty fultter iOS project
add flutter_keychain as dependency
use Xcode to run

It will build successful but report an runtime error: dyld[2683]: Symbol not found: _OBJC_CLASS_$_NSObject.

keys() method not implemented in android or ios

// keys - get all keys
  static Future<List<String>> keys() async =>
      await _channel.invokeMethod('keys');

Throws Unhandled Exception: MissingPluginException(No implementation found for method keys on channel plugin.appmire.be/flutter_keychain)

Kotlin code:

when (call.method) {
                "get" -> {
                    val encryptedValue: String? = preferences.getString(call.key(), null)
                    val value = encryptor.decrypt(encryptedValue)
                    result.success(value)
                }
                "put" -> {
                    val value = encryptor.encrypt(call.value())
                    preferences.edit().putString(call.key(), value).commit()
                    result.success(null)
                }
                "remove" -> {
                    preferences.edit().remove(call.key()).commit()
                    result.success(null)
                }
                "clear" -> {
                    preferences.edit().clear().commit()
                    result.success(null)
                }
                else -> result.notImplemented()
            }

Either this is removed from both the lib and documentation, or the implementation should be added for iOS and Android

After installation got error: inferred type is String? but String was expected

Hello everyone!

After installation this package I can`t run application. I get error only for Android:

.../flutter/.pub-cache/hosted/pub.dartlang.org/flutter_keychain-2.0.0/android/src/main/kotlin/be/appmire/flutterkeychain/FlutterKeychainPlugin.kt: (320, 39): Type mismatch: inferred type is String? but String was expected

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':flutter_keychain:compileDebugKotlin'.
> Compilation error. See log for more details

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 5s
Exception: Gradle task assembleDebug failed with exit code 1

My environment:
Android Studio 4.2.1
Flutter 2.2.0
Kotlin 202-1.5.0-release-764-AS8194.7

Any clues? Thanks!
@jeroentrappers

Android - Add commits() for delete and clear

On some android devices, like the Samsung Galaxy S9, if you don't explicitly call commit, shared prefs will not be updated and it will be like you never deleted the key.

"remove" -> {
    preferences.edit()
    .remove(call.key())
    .commit()
    result.success(null)
}
"clear" -> {
    preferences.edit()
    .clear()
    .commit()
    result.success(null)
}

You may also want add @SuppressLint("ApplySharedPref") to the method since android studio complains about using commit() over apply(). But in this case, I would think that commit (which synchronously) is the correct behaviour.

Add support for V2 embedding

When I'm running the app this warning pops up:
The plugin flutter_keychain uses a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to see if these plugins support the Android V2 embedding. Otherwise, consider removing them since a future release of Flutter will remove these deprecated APIs.
If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: https://flutter.dev/go/android-plugin-migration.

Question: relation to flutter_secure_storage

Hi,

Can you help me understand how this package relates to mogol/flutter_secure_storage, the readme is surprisingly similar.

No implementation found for method.

No implementation found for method put on channel plugin.appmire.be/flutter_keychain

Crash : HTC One (m7) - java.lang.NoClassDefFoundError

Device info

HTC One (m7), Android 5.0

Crash log:

java.lang.NoClassDefFoundError: 
  at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createKeys (FlutterKeychainPlugin.kt:156)
  at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createRSAKeysIfNeeded (FlutterKeychainPlugin.kt:123)
  at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.<init> (FlutterKeychainPlugin.kt:48)
  at be.appmire.flutterkeychain.FlutterKeychainPlugin$Companion.registerWith (FlutterKeychainPlugin.kt:280)
  at be.appmire.flutterkeychain.FlutterKeychainPlugin.registerWith (FlutterKeychainPlugin.kt)
  at io.flutter.plugins.GeneratedPluginRegistrant.registerWith (GeneratedPluginRegistrant.java:26)
  at com.nartus.mywallet.MainActivity.onCreate (MainActivity.java:11)
  at android.app.Activity.performCreate (Activity.java:5958)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1129)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2364)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2474)
  at android.app.ActivityThread.access$800 (ActivityThread.java:144)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1359)
  at android.os.Handler.dispatchMessage (Handler.java:102)
  at android.os.Looper.loop (Looper.java:155)
  at android.app.ActivityThread.main (ActivityThread.java:5696)
  at java.lang.reflect.Method.invoke (Native Method)
  at java.lang.reflect.Method.invoke (Method.java:372)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1028)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:823)
Caused by: java.lang.ClassNotFoundException: 
  at dalvik.system.BaseDexClassLoader.findClass (BaseDexClassLoader.java:56)
  at java.lang.ClassLoader.loadClass (ClassLoader.java:511)
  at java.lang.ClassLoader.loadClass (ClassLoader.java:469)

BAD_DECRYPT Exception

Sometimes on debug mode, and more often in release mode, the following occurs:

E/flutter_keychain(13452): error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452): Failed to handle method call
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452): java.lang.IllegalArgumentException: Unsupported value: javax.crypto.BadPaddingException: error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at io.flutter.plugin.common.StandardMessageCodec.writeValue(StandardMessageCodec.java:294)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at io.flutter.plugin.common.StandardMethodCodec.encodeErrorEnvelope(StandardMethodCodec.java:70)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.error(MethodChannel.java:230)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at be.appmire.flutterkeychain.FlutterKeychainPlugin.onMethodCall(FlutterKeychainPlugin.kt:323)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:222)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:90)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:234)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at android.os.MessageQueue.next(MessageQueue.java:326)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at android.os.Looper.loop(Looper.java:160)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at android.app.ActivityThread.main(ActivityThread.java:6940)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
E/MethodChannel#plugin.appmire.be/flutter_keychain(13452):      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
E/flutter (13452): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: PlatformException(error, Unsupported value: javax.crypto.BadPaddingException: error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT, null)

when using the get method

// get - get the value for a given key
  static Future<String> get({@required String key}) async =>
      await _channel.invokeMethod('get', {'key': key});

Support for Biometric Authentication

Any plans to support biometric authentication?

On iOS this can be implemented by sending the biometryAny or biometryCurrentSet SecAccessControlCreateFlags, the system will then handle showing a TouchID/FaceID prompt to the user when the value is read back.

On Android this can be implemented with a .setUserAuthenticationRequired(true) call together with BiometricPrompt (using androidx for backwards compat). Here is an example from Google, and here is a guide on getting the compat lib up and running.

🚀

Where the plugin store the data? on the device?

Where is the storage on the device or ???
iOS?
Android?
Thanks

Would it be possible to add support for SecAccessControlCreateWithFlags for iOS

With iOS you can restrict access to the keychain based upon the device state (passcode set, unlocked, after first unlock or always) which you have implemented.

You can also require the user presence - - Allowing access only when the device is unlocked (the default) may not be secure enough in all cases. If your app provides direct control over a bank account, you can check for the presence of the authorized user at the very last minute before retrieving login credentials from the keychain. This helps secure the account even if the user hands the device in an unlocked state to someone else.

Would it be possible to add this functionality to flutter_keychain?

https://developer.apple.com/documentation/security/keychain_services/keychain_items/restricting_keychain_item_accessibility under Demand User Presence.

Null safety migration

Migrate the package with null safety support

Values of type 'OSStatus' should not be used as format arguments

Getting a weird message when building:

[10:24:26]: ▸ ⚠️  /Users/me/.fluttersdk/.pub-cache/hosted/pub.dartlang.org/flutter_keychain-1.0.0/ios/Classes/FlutterKeychainPlugin.m:95:49: values of type 'OSStatus' should not be used as format arguments; add an explicit cast to 'int' instead [-Wformat]
[10:24:26]: ▸             NSLog(@"SecItemUpdate status = %d", status);
[10:24:26]: ▸                                            ~~   ^~~~~~
[10:24:26]: ▸ ⚠️  /Users/me/.fluttersdk/.pub-cache/hosted/pub.dartlang.org/flutter_keychain-1.0.0/ios/Classes/FlutterKeychainPlugin.m:103:46: values of type 'OSStatus' should not be used as format arguments; add an explicit cast to 'int' instead [-Wformat]
[10:24:26]: ▸             NSLog(@"SecItemAdd status = %d", status);
[10:24:26]: ▸                                         ~~   ^~~~~~

Seems you can just cast it to (int) like they did in this project:

mogol/flutter_secure_storage@eef67d3

Required Gradle version is low

The Android Gradle plugin supports only Kotlin Gradle plugin version 1.3.40 and higher.
The following dependencies do not satisfy the required version:
project ':flutter_keychain' -> org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.21

Read from keychain in iOS project

Hello! I made a package with flutter and imported it into swift project.
In my swift project, I can read data stored by flutter_keychain in flutter part. However, in flutter package, I can't read data from swift keychain. I tried other keychain package such as flutter_secure_storage. I got the same result.
What's more, in flutter project, I can't use flutter_secure_storage to read data stored by flutter_keychain.
Is there any way I can do to read data stored in swift project? Thanks a lot.

Library not working in Android 9

When using this library ion Android 9, the following occurs:

W/KeyStore( 1614): KeyStore exception
W/KeyStore( 1614): android.os.ServiceSpecificException:  (code 7)
W/KeyStore( 1614):      at android.os.Parcel.createException(Parcel.java:1964)
W/KeyStore( 1614):      at android.os.Parcel.readException(Parcel.java:1918)
W/KeyStore( 1614):      at android.os.Parcel.readException(Parcel.java:1868)
W/KeyStore( 1614):      at android.security.IKeystoreService$Stub$Proxy.get(IKeystoreService.java:786)
W/KeyStore( 1614):      at android.security.KeyStore.get(KeyStore.java:195)
W/KeyStore( 1614):      at android.security.keystore.AndroidKeyStoreSpi.engineGetCertificateChain(AndroidKeyStoreSpi.java:118)
W/KeyStore( 1614):      at java.security.KeyStoreSpi.engineGetEntry(KeyStoreSpi.java:484)
W/KeyStore( 1614):      at java.security.KeyStore.getEntry(KeyStore.java:1560)
W/KeyStore( 1614):      at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.createRSAKeysIfNeeded(FlutterKeychainPlugin.kt:125)
W/KeyStore( 1614):      at be.appmire.flutterkeychain.RsaKeyStoreKeyWrapper.<init>(FlutterKeychainPlugin.kt:48)
W/KeyStore( 1614):      at be.appmire.flutterkeychain.FlutterKeychainPlugin$Companion.registerWith(FlutterKeychainPlugin.kt:280)
W/KeyStore( 1614):      at be.appmire.flutterkeychain.FlutterKeychainPlugin.registerWith(Unknown Source:2)
W/KeyStore( 1614):      at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:31)
W/KeyStore( 1614):      at com.ianum.ianumflutter.MainActivity.onCreate(MainActivity.kt:12)
W/KeyStore( 1614):      at android.app.Activity.performCreate(Activity.java:7155)
W/KeyStore( 1614):      at android.app.Activity.performCreate(Activity.java:7146)
W/KeyStore( 1614):      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1288)
W/KeyStore( 1614):      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3037)
W/KeyStore( 1614):      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3197)
W/KeyStore( 1614):      at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
W/KeyStore( 1614):      at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
W/KeyStore( 1614):      at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
W/KeyStore( 1614):      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1926)
W/KeyStore( 1614):      at android.os.Handler.dispatchMessage(Handler.java:106)
W/KeyStore( 1614):      at android.os.Looper.loop(Looper.java:193)
W/KeyStore( 1614):      at android.app.ActivityThread.main(ActivityThread.java:6923)
W/KeyStore( 1614):      at java.lang.reflect.Method.invoke(Native Method)
W/KeyStore( 1614):      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
W/KeyStore( 1614):      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

This may happen due to the fact that Android changed the way it accesses the Keychain: https://stackoverflow.com/a/52295484/4499889

After reinstall the app, the key stored last time was lost[ on Android]

Would it be available that keep the key stored by this plugin even if reinstall the app?

:flutter_keychain:verifyReleaseResources

When I try building the apk, I got this issue.

1: Task failed with an exception.
-----------
* What went wrong:
Execution failed for task ':flutter_keychain:verifyReleaseResources'.
> A failure occurred while executing com.android.build.gradle.tasks.VerifyLibraryResourcesTask$Action
   > Android resource linking failed
     ERROR: /Users/mr.minnu/survey/build/flutter_keychain/intermediates/aapt_friendly_merged_manifests/release/aapt/AndroidManifest.xml:2: AAPT: error: attribute 'package' in <manifest> tag is not a valid Android package name: 'flutter_keychain'.


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> Run with --stacktrace option to get the stack trace.
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==============================================================================

* Get more help at https://help.gradle.org

Android error: OPENSSL_internal:BAD_DECRYPT

Get this error for some of my Android users.

Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: PlatformException(flutter_keychain, error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT, javax.crypto.BadPaddingException: error:1e000065:Cipher functions:OPENSSL_internal:BAD_DECRYPT
	at com.android.org.conscrypt.NativeCrypto.EVP_CipherFinal_ex(Native Method)
	at com.android.org.conscrypt.OpenSSLEvpCipher.doFinalInternal(OpenSSLEvpCipher.java:152)
	at com.android.org.conscrypt.OpenSSLCipher.engineDoFinal(OpenSSLCipher.java:374)
	at javax.crypto.Cipher.doFinal(Cipher.java:2056)
	at d0.a.b(Unknown Source:40)
	at d0.b.onMethodCall(Unknown Source:181)
	at v4.k$a.a(Unknown Source:17)
	at i4.c.l(Unknown Source:18)
	at i4.c.m(Unknown Source:40)
	at i4.c.i(Unknown Source:0)
	at i4.b.run(Unknown Source:12)
	at android.os.Handler.handleCallback(Handler.java:978)
	at android.os.Handler.dispatchMessage(Handler.java:104)
	at android.os.Looper.loopOnce(Looper.java:238)
	at android.os.Looper.loop(Looper.java:355)
	at android.app.ActivityThread.main(ActivityThread.java:8080)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1026)
, null). Error thrown PlatformException.
       at StandardMethodCodec.decodeEnvelope(message_codecs.dart:653)
       at MethodChannel._invokeMethod(platform_channel.dart:315)
       at FlutterKeychain.get(flutter_keychain.dart:15)
       at ._getHydratedStorageEncryptionKey(bootstrap.dart:421)
       at ._getHydratedStorage(bootstrap.dart:409)
       at .bootstrap(bootstrap.dart:40)
       at .mainDelegate(main_delegate.dart:72)

This is the code

Future<Storage> _getHydratedStorage() async {
  var encryptionKey = await _getHydratedStorageEncryptionKey();
  final storage = await HydratedStorage.build(
    storageDirectory: await getTemporaryDirectory(),
    encryptionCipher: HydratedAesCipher(
      sha256.convert(utf8.encode(encryptionKey)).bytes,
    ),
  );
  return storage;
}

Future<String> _getHydratedStorageEncryptionKey() async {
  const storageKey = '...';
  var encryptionKey = await FlutterKeychain.get(
    key: storageKey,
  );
  if (encryptionKey == null) {
    encryptionKey = base64.encode(Hive.generateSecureKey());
    await FlutterKeychain.put(
      key: storageKey,
      value: encryptionKey,
    );
  }
  return encryptionKey;
}

And this is the version of the package.

environment:
  sdk: '>=2.19.0 <3.0.0'

dependencies:
  flutter:
    sdk: flutter
  flutter_keychain: ^2.2.1

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