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iamMehedi / Secured-Preference-Store

A cryptography library and a SharedPreferences wrapper for Android that encrypts the content with 256 bit AES encryption. The Encryption key is securely stored in device's KeyStore.
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"Attempt to invoke interface method 'int android.security.IKeystoreService.exist(java.lang.String, int)' on a null object reference" error #7

Open skhugh opened 7 years ago

skhugh commented 7 years ago

When beta testing my app, one user out of around 1,000 users experienced "Attempt to invoke interface method 'int android.security.IKeystoreService.exist(java.lang.String, int)' on a null object reference" error and could not log in to my service with the following exception.

Caused by java.lang.NullPointerException: Attempt to invoke interface method 'int android.security.IKeystoreService.exist(java.lang.String, int)' on a null object reference android.security.KeyStore.contains (KeyStore.java:137) android.security.KeyStore.contains (KeyStore.java:145) android.security.AndroidKeyStore.engineContainsAlias (AndroidKeyStore.java:415) java.security.KeyStore.containsAlias (KeyStore.java:442) devliving.online.securedpreferencestore.EncryptionManager.generateRSAKeys (EncryptionManager.java:458) devliving.online.securedpreferencestore.EncryptionManager.generateKey (EncryptionManager.java:348) devliving.online.securedpreferencestore.EncryptionManager.<init> (EncryptionManager.java:95) devliving.online.securedpreferencestore.SecuredPreferenceStore.<init> (SecuredPreferenceStore.java:36) devliving.online.securedpreferencestore.SecuredPreferenceStore.getSharedInstance (SecuredPreferenceStore.java:42)

Is there any solutions to this problem?

I'm using minSdk 21 and target 25. The device info is:-

Manufacturer: LGE Model: LG-F460K Board: Apq8084 Android API: 21 Android OS: 5.0.1

iamMehedi commented 7 years ago

Looks like the KeyStore instance was null when creating the EncryptionManager instance. May be the device doesn't have a AndroidKeyStore implementation. I'll try and see why is it throwing a NullPointerException when the expected would be a KeyStoreException or NoSuchProviderException.

texnedo commented 7 years ago

Hello. I am facing the same stack trace from my apps. Did you get a clue how to make a workaround for it?

iamMehedi commented 7 years ago

@texnedo I could not actually reproduce it on any devices that I have. Are you using the latest version of the library with the recovery handler? And the recovery handler is not getting invoked?

texnedo commented 7 years ago

I don't use this library, but work with AndroidKeyStore directly. I was just googling to find any solution for my issue. What does this recovery handler do? Could you navigate me in your repo the place where I can find it?

iamMehedi commented 7 years ago

@texnedo In that case the recovery handler wouldn't be very useful for you I guess as it doesn't solve the issue; just provides the library a way to start over.

iamMehedi commented 6 years ago

@skhugh were you trying to access the secured preferences from a remote service? This error seems to be related to this: https://android.googlesource.com/platform/external/sepolicy/+/0e30164b17af20f680635c7c6c522e670ecc3df3

waylon-edmodo commented 3 years ago

Is there any better way to solve this problem. From firebase's crashlytics, we found a large number of crash logs of this type of problem.