I don't think Google Authenticator actually currently supports any of these
extra digit/algorithm options, but they're specified in the proto file, so we
should support them for completeness sake.
The main goals of this patch are to:
- Improve the exception handling in Aegis and the way we present errors messages
to the user when they occur.
- Write exception stack traces to the log in more places, so that the ADB logs
we ask for from our users when reporting bugs become more useful.
- Reduce the amount of times we throw a RuntimeException, particularly when an
Android Keystore operation fails.
Achieving the above goals ended up resulting in a very large refactor. The
intro and unlock flow of the app need to be retested entirely.
I kept the classes in the encoding package and turned them into wrappers for
Guava. I also changed the functions in the Base32 class to take and return
strings insteads if character arrays.
The conversion of the OTP period value to milliseconds may overflow for large
values, causing the result to wrap around to Integer.MIN_VALUE. This
subsequently caused a crash when calling ObjectAnimator.setDuration.
