Some additional changes (apart from the regular style modifications) were needed: - Guava crypto methods are replaced by their javax equivalents. - Preconditions checks now depend on com.android.util rather than Guava. Bug: 111386661,116575321 Test: atest RunFrameworksServicesRoboTests Change-Id: I43f92f1c0fb3acf62469712d8db212f94429116c