Error reading file from cache with Bouncy Castle

Question

Using the following code:

List<OfflineCommand> l = (List<OfflineCommand>)Storage.getInstance().readObject(
    user + apptID + "-offlineCommandsEnc"
);
if (l != null && l.size() > 0) {
    flgSuccess = true;
}


public void init(Object context) {
        Preferences.setPreferencesLocation("EncryptedPreferences");
        Storage.getInstance().deleteStorageFile(Cookie.STORAGE_NAME);
        EncryptedStorage.install("***********");
        JSONParser.setUseLongs(true);
}

This error is being thrown on the first line:

[EDT] 0:1:27,628 - Exception: org.bouncycastle.crypto.DataLengthException - last block incomplete in decryption org.bouncycastle.crypto.DataLengthException: last block incomplete in decryption at org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher.doFinal(PaddedBufferedBlockCipher.java:281) at com.codename1.crypto.EncryptedStorage.createInputStream(EncryptedStorage.java:63) at com.codename1.io.Storage.readObject(Storage.java:260) at com.fluency.fluencymobile.server.ServerImpl.verifyActivityExists(ServerImpl.java:709) at com.fluency.fluencymobile.forms.AppointmentForm.lambda$new$4(AppointmentForm.java:512) at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:349) at com.codename1.ui.Button.fireActionEvent(Button.java:570) at com.codename1.ui.Button.released(Button.java:604) at com.codename1.ui.Button.pointerReleased(Button.java:708) at com.codename1.ui.Form.pointerReleased(Form.java:3262) at com.codename1.ui.Component.pointerReleased(Component.java:4288) at com.codename1.ui.Display.handleEvent(Display.java:2065) at com.codename1.ui.Display.edtLoopImpl(Display.java:1043) at com.codename1.ui.Display.mainEDTLoop(Display.java:961) at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120) at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)

Shai Almog Shai Almog · Accepted Answer · 2018-10-08T04:12:56

You have an encrypted filesystem to which you wrote or read before the encryption was activated in the init(Object) method possibly via a static initializer, push callback or something like that.

You need to make sure that EncryptedStorage.install() happens before you do any storage access whether to read or write.

Error reading file from cache with Bouncy Castle

1 Answers