SCTF ANDROID CHALLENGE

b.java

public interface b extends IInterface {
    public static abstract class a extends Binder implements b {

        public static b b(IBinder iBinder) {
            if (iBinder == null) {
                return null;
            }
            IInterface queryLocalInterface = iBinder.queryLocalInterface("com.sctf2020.vault101.IVault");
            return (queryLocalInterface == null || !(queryLocalInterface instanceof b)) ? new C0039a(iBinder) : (b) queryLocalInterface;
        }

        public IBinder asBinder() {
            return this;
        }

        public boolean onTransact(int i, Parcel parcel, Parcel parcel2, int i2) {
            String str = "com.sctf2020.vault101.IVault";
            if (i == 1) {
                parcel.enforceInterface(str);
                boolean a2 = a(parcel.readString());
                parcel2.writeNoException();
                parcel2.writeInt(a2 ? 1 : 0);
                return true;
            } else if (i != 1598968902) {
                return super.onTransact(i, parcel, parcel2, i2);
            } else {
                parcel2.writeString(str);
                return true;
            }
       }
    }
    boolean a(String str);
}