Realm-java: EncryptionKey The provided key must be 64 bytes. Yours was: 66

[worm69]

[GOAL]Need encrypt db using a key stored in with NDK
the error is contradictory
[LogCat]
java.lang.RuntimeException: Unable to start activity ComponentInfo{pt.dbmg.mobiletaiga/pt.dbmg.mobiletaiga.ui.activity.Login}: java.lang.IllegalArgumentException: The provided key must be 64 bytes. Yours was: 66 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) Caused by: java.lang.IllegalArgumentException: The provided key must be 64 bytes. Yours was: 66 at io.realm.RealmConfiguration$Builder.encryptionKey(RealmConfiguration.java:554) at pt.dbmg.mobiletaiga.ui.activity.Login.onCreate(Login.kt:71)

[Steps & Code to Reproduce]
Can see problem in my git project https://github.com/worm69/mobiletaiga/tree/dev

Realm version(s): 5.8.0

Realm Sync feature enabled: No

Android Studio version:
Android Studio 3.3.1
Build #AI-182.5107.16.33.5264788, built on January 28, 2019
JRE: 1.8.0_152-release-1248-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0

Android Build Tools version: 28.0.3

Gradle version: 4.10.3

Which Android version and device(s): Any

[ppamorim]

This key doesn't contain 64 bytes, You should generate this randomly from each app install, getting this key from NDK encrypts nothing and can be easily bypassed.

[worm69]

@ppamorim Thx for advice. How i should store after generate randomly?
I am locking for better approach to store any passwords/secret key
Can explain me better why dont have 64 bytes?

[ppamorim]

You should store your key on the Keystore, you can create your key using SecureRandom, Cipher and Android's KeyStore.

[realm-probot[bot]]

Hey - looks like you forgot to add a T:* label - could you please add one?

[worm69]

with https://github.com/realm/realm-java/tree/master/examples/encryptionExample example cant open db on windows using realm studio

Look like other people have problems with that https://github.com/realm/realm-js/issues/1829

[worm69]

try with emulator and mi Xiaomi

[Zhuinden]

Isn't the trick that you must provide the hex string to Realm Studio instead of the encryption key directly?

[worm69]

@Zhuinden should by only Copy the key from Logcat, like example said

    // Generate a key
    // IMPORTANT! This is a silly way to generate a key. It is also never stored.
    // For proper key handling please consult:
    // * https://developer.android.com/training/articles/keystore.html
    // * http://nelenkov.blogspot.dk/2012/05/storing-application-secrets-in-androids.html
    byte[] key = new byte[64];
    new SecureRandom().nextBytes(key);

    // An encrypted Realm file can be opened in Realm Studio by using a Hex encoded version
    // of the key. Copy the key from Logcat, then download the Realm file from the device using
    // the method described here: https://stackoverflow.com/a/28486297/1389357
    // The path is normally `/data/data/io.realm.examples.encryption/files/default.realm`
    Log.i("RealmEncryptionKey", Util.bytesToHex(key));

[cmelchior]

This worked fine for me:

Maybe you tried to open the wrong Realm?

[worm69]

Nop, check video https://youtu.be/XmHdQJLF9zc i will try later on linux if work

[worm69]

Hi work on Linux maybe file system problem

[cmelchior]

Hmm, interesting if this points to a problem on Windows.