def test_SubBytesInv(self):
# test single substitution
sbox_input = gf._cache.fetch_int(0xb8)
expected_result = gf._cache.fetch_int(0x9a)
instance = AES()
result = instance.SubBytesInv([sbox_input])[0]
self.assertEquals(expected_result, result)
poly = gf._cache.fetch_int(0x99)
self.assertEquals(poly,
instance.SubBytesInv(instance.SubBytes([poly]))[0])
# full inversion test
self.assertEquals(
self.gf_full,
instance.SubBytesInv(instance.SubBytes(self.gf_full)))
