### Question:
Util { static FP os2ip_modP(Bytes b) { return new FP(new DBIGExtended(b.toArray()).mod(P)); }    }### Answer:
@Test void os2ipTest() { byte[] bytes = {1, 2, 3, 4}; assertEquals(new BIG(0x01020304).toString(), os2ip_modP(Bytes.wrap(bytes)).toString()); }