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Encrypted Room db
abstract class EncryptedDatabase : RoomDatabase() {
companion object {
fun getInstance(passcode: CharArray, context: Context):
EncryptedDatabase = buildDatabase(passcode, context)
private fun buildDatabase(
passcode: CharArray,
context: Context
): EncryptedDatabase {
// DatabaseKeyMgr is a singleton that all of the above code is wrapped into.
// Ideally this should be injected through DI but to simplify the sample code
// we'll retrieve it as follows
val dbKey = DatabaseKeyMgr.getInstance().getCharKey(passcode, context)
val supportFactory = SupportFactory(SQLiteDatabase.getBytes(dbKey))
return Room.databaseBuilder(context,,
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