Fix allowDeviceAuthentication failing on Android 31 and later
#225
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non-biometric authentication. There is an issue in newer versions of Android that require different configuration of the biometrics library for dual auth flows.
a few other refactors to clean things up.
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These changes are to attempt to address the issue outlined in #181. I was able to address the root issue where the
android.security.KeyStoreException: Key user not authenticatedis reported when attempting to sign with the private key. It appears from this documentation that when usingBiometricPrompt.authenticatewe must use the form of the method that does not takeCryptoObjectas that implies the prompt will be used for Biometric authentication only (supporting documentation https://developer.android.com/training/sign-in/biometric-auth#biometric-or-lock-screen).After updating the implementation to not use the
CryptoObjectform ofBiometricPrompt.authenticate. After enabling this new form of authentication for both Biometric and device authentication I did find that I was no longer able to verify the signature with my test backend. I was not able to resolve this issue and was hoping that someone else might take a look at my changes and be able to see what change may have caused this regression.