if len(square) != len(mat) {
		panic("square matrix size mismatch")
	}
	for n := range mat {
		square[n] = gf2MatrixTimes(mat, mat[n])
	}
}

// crc32Combine returns the combined CRC-32 hash value of the two passed CRC-32
// hash values crc1 and crc2. poly represents the generator polynomial
// and len2 specifies the byte length that the crc2 hash covers.
func crc32Combine(poly uint32, crc1, crc2 uint32, len2 int64) uint32 {

  }

  private static int referenceCrc(byte[] bytes) {
    int crc = ~0;
    for (byte b : bytes) {
      crc = (crc >>> 8) ^ Crc32cHashFunction.Crc32cHasher.byteTable[(crc ^ b) & 0xFF];
    }
    return ~crc;
  }

  /**
   * Verifies that the crc of an array of byte data matches the expected value.
   *
   * @param expectedCrc the expected crc value.
   * @param data the data to run the checksum on.
   */

	// Seed (random)
	crc := uint64(0xc2b40bbac11a7295)
	// Xor each value to make order independent
	for k, v := range m {
		// Separate key and value with an individual xor with a random number.
		// Add values of each, so they cannot be trivially collided.
		crc ^= (xxh3.HashString(k) ^ 0x4ee3bbaf7ab2506b) + (xxh3.HashString(v) ^ 0x8da4c8da66194257)
	}
	return crc
}

	// Zero unimportant fields
	c.Erasure.Index = 0
	c.Minio.Release = ""
	crc := hashDeterministicString(c.Meta)
	c.Meta = nil

	if bts, err := c.MarshalMsg(metaDataPoolGet()); err == nil {
		crc ^= xxhash.Sum64(bts)
		metaDataPoolPut(bts)
	}

	// Combine upper and lower part
	var tmp [4]byte
	binary.LittleEndian.PutUint32(tmp[:], uint32(crc^(crc>>32)))
	return tmp
}

// XL metadata constants.
const (

				// Read metadata CRC (added in v2, ignore if not found)
				b = nbuf
			}

			_, e = msgp.CopyToJSON(buf, bytes.NewReader(v))
			if e != nil {
				return nil, e
			}
			data = b
		case 3:
			v, b, e := msgp.ReadBytesZC(b)
			if e != nil {
				return nil, e
			}
			if _, nbuf, e := msgp.ReadUint32Bytes(b); e == nil {
				// Read metadata CRC (added in v2, ignore if not found)
				b = nbuf

	id, err := hex.DecodeString(keyHex[:8])
	if err != nil {
		return err
	}
	key, err := hex.DecodeString(keyHex[8:])
	if err != nil {
		return err
	}
	// Verify that CRC is ok.
	want := binary.LittleEndian.Uint32(id)
	got := crc32.ChecksumIEEE(key)
	if want != got {
		return fmt.Errorf("Invalid key checksum, want %x, got %x", want, got)
	}

	stream, err := sio.AES_256_GCM.Stream(key)

	}

	if sipHashElement := hashKey("UNKNOWN", "This will fail", 0, testUUID); sipHashElement != -1 {
		t.Errorf("Test: Expected \"-1\" but got \"%v\"", sipHashElement)
	}
}

// TestCrcHashMod - test crc hash.
func TestCrcHashMod(t *testing.T) {
	testCases := []struct {
		objectName string
		crcHash    int
	}{
		// cases which should pass the test.
		// passing in valid object name.
		{"object", 28},

		// First version to carry data.
		return buf
	}
	// Skip header
	_, metaBuf, err = msgp.ReadBytesZC(metaBuf)
	if err != nil {
		storageLogIf(GlobalContext, err)
		return buf
	}
	// Skip CRC
	if maj > 1 || minor >= 2 {
		_, metaBuf, err = msgp.ReadUint32Bytes(metaBuf)
		storageLogIf(GlobalContext, err)
	}
	//   =  input - current pos
	ends := len(buf) - len(metaBuf)
	if ends > len(buf) {