Exception casting to RSAPublicKey

[andy9775]

When running on API 23 there seems to be an issue with RSAPublicKey. Possible cause: http://stackoverflow.com/questions/32400689/crash-casting-androidkeystorersaprivatekey-to-rsaprivatekey

More info:
the exception is,
java.lang.ClassCastException: android.security.keystore.AndroidKeyStoreECPublicKey cannot be cast to java.security.interfaces.RSAPublicKey
This happens inside this code block

 String alias = getUniqueDeviceId(this.context);
        try {
            final KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStoreInstance.getEntry(alias, null);
            final RSAPublicKey publicKey = (RSAPublicKey) privateKeyEntry.getCertificate().getPublicKey();
            return crypto.encrypt(input, publicKey);
        } catch (NoSuchAlgorithmException |
                UnrecoverableEntryException |
                KeyStoreException e) {
            Log.e("QlassifiedKeyStore", String.format("Could not encrypt this string. Stacktrace: %s", e));
            return null;
        }

In the QlassifiedKeyStore.encrypt method.
I have the code running on both an emulator with 6.0 and a device with 6.0.1.

[nmalcolm]

I'm getting this error after generating a signed APK and trying to encrypt a string. However, it works fine while debugging with Android Studio.

QlassifiedCrypto: Could not encrypt this string. Stacktrace: java.security.NoSuchAlgorithmException: Provider SC does not provide RSA/NONE/PKCS1Padding

Unfortunately my crypto and Java knowledge is too weak to figure out the cause.

I'm using your fork along with the patch from #1.

[andy9775]

@nmalcolm are you getting that error with my pull request (my fork) and a signed apk? Try https://github.com/andy9775/Qlassified-Android/tree/jitpack as it should be the most up to date version.

To use it as a jitpack dependency check out https://jitpack.io/docs/ANDROID/#installing

[nmalcolm]

Yep, I'm using that already. Doesn't crash while encrypting, only discovered it by generating a signed APK, installing it manually, and checking the Android Studio log. Had others reproduce the issue too.

[andy9775]

@nmalcolm I created a signed APK of the example project provided in the library using the jipack branch of my fork and I can't seem to reproduce the issue that your getting. I'm only getting an IllegalBlockSizeException which I need to address, but the data encrypts/decrypts without issue.

This is running on genymotion with android 6.0 as well as a galaxy s7 with 6.0.1

[ShaPOC]

@nmalcolm Are you still having this issue with version 0.1.1? The QlassifiedCrypto: Could not encrypt this string. Stacktrace: java.security.NoSuchAlgorithmException: Provider SC does not provide RSA/NONE/PKCS1Padding? And only with signed APKs?

[nmalcolm]

@ShaPOC I am indeed. I'm baffled a signed APK doesn't work. Debugging works perfectly. Let me know if there's anything you need.

[zhibuyu]

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My Mi5 may also have this problem, I tested all of our team 6.0 phone will quote ava. Lang. ClassCastException: android. Security. Keystore. AndroidKeyStoreRSAPrivateKey always be cast to Java security. Interfaces. RSAPrivateKey. 6.0 the following: no problem

[ghost]

Im having this same issue when i turn minifyEnabled TRUE

Could not encrypt this string. Stacktrace: java.security.NoSuchAlgorithmException: Provider SC does not provide RSA/NONE/PKCS1Padding

Any ideas why?

[zhibuyu]

You can look at this.Compatible with 8.0：https://github.com/zhibuyu/KeyStoreEncryDemo