/**
 * An enum that contains all of the known hash functions.
 *
 * @author Kurt Alfred Kluever
 */
@NullUnmarked
enum HashFunctionEnum {
  ADLER32(Hashing.adler32()),
  CRC32(Hashing.crc32()),
  GOOD_FAST_HASH_32(Hashing.goodFastHash(32)),
  GOOD_FAST_HASH_64(Hashing.goodFastHash(64)),
  GOOD_FAST_HASH_128(Hashing.goodFastHash(128)),
  GOOD_FAST_HASH_256(Hashing.goodFastHash(256)),
  MD5(Hashing.md5()),

	// Deprecated: Use Modified instead.
	ModifiedTime uint16

	// ModifiedDate is an MS-DOS-encoded date.
	//
	// Deprecated: Use Modified instead.
	ModifiedDate uint16

	// CRC32 is the CRC32 checksum of the file content.
	CRC32 uint32

	// CompressedSize is the compressed size of the file in bytes.
	// If either the uncompressed or compressed size of the file

				} else {
					err = err1
				}
			} else if r.hash.Sum32() != r.f.CRC32 {
				err = ErrChecksum
			}
		} else {
			// If there's not a data descriptor, we still compare
			// the CRC32 of what we've read against the file header
			// or TOC's CRC32, if it seems like it was set.
			if r.f.CRC32 != 0 && r.hash.Sum32() != r.f.CRC32 {
				err = ErrChecksum
			}
		}
	}
	r.err = err
	return
}

  }

  @Immutable
  enum ChecksumType implements ImmutableSupplier<Checksum> {
    CRC_32("Hashing.crc32()") {
      @Override
      public Checksum get() {
        return new CRC32();
      }
    },
    @J2ObjCIncompatible
    CRC_32C("Hashing.crc32c()") {
      // Crc32CSupplier.pickFunction uses this only when it finds that CRC32C is available.
      @SuppressWarnings("Java8ApiChecker")
      @IgnoreJRERequirement

				}
			}
			f, err := w.CreateHeader(&FileHeader{
				Name:   filename,
				Method: Store,
			})
			if err != nil {
				t.Fatal(err)
			}
			f.(*fileWriter).crc32 = fakeHash32{}
			size := wantOff - fileHeaderLen - uint64(len(filename)) - dataDescriptorLen
			if _, err := io.CopyN(f, zeros{}, int64(size)); err != nil {
				t.Fatal(err)
			}
			if err := w.Close(); err != nil {

func hashOrder(key string, cardinality int) []int {
	if cardinality <= 0 {
		// Returns an empty int slice for cardinality < 0.
		return nil
	}

	nums := make([]int, cardinality)
	keyCrc := crc32.Checksum([]byte(key), crc32.IEEETable)

	start := int(keyCrc % uint32(cardinality))
	for i := 1; i <= cardinality; i++ {
		nums[i-1] = 1 + ((start + i) % cardinality)
	}
	return nums
}

			wantHeaders:        map[string]string{"x-amz-checksum-crc32c": checksumData(bytesData, crc32.New(crc32.MakeTable(crc32.Castagnoli)))},
		},
		// CRC32 as CRC32C
		11: {
			bucketName:         bucketName,
			objectName:         objectName,
			headers:            map[string]string{"x-amz-checksum-crc32c": checksumData(bytesData, crc32.New(crc32.IEEETable))},
			data:               bytesData,

	return messWith("go-with-datadesc-sig.zip", func(b []byte) {
		// Corrupt one of the CRC32s in the data descriptor:
		b[0x2d]++
	})
}

func returnCorruptNotStreamedZip() (r io.ReaderAt, size int64) {
	return messWith("crc32-not-streamed.zip", func(b []byte) {
		// Corrupt foo.txt's final crc32 byte, in both
		// the file header and TOC. (0x7e -> 0x7f)
		b[0x11]++
		b[0x9d]++

	sum64 := siphash.Hash(k0, k1, []byte(key))
	return int(sum64 % uint64(cardinality))
}

func crcHashMod(key string, cardinality int) int {
	if cardinality <= 0 {
		return -1
	}
	keyCrc := crc32.Checksum([]byte(key), crc32.IEEETable)
	return int(keyCrc % uint32(cardinality))
}

func hashKey(algo string, key string, cardinality int, id [16]byte) int {
	switch algo {
	case formatErasureVersionV2DistributionAlgoV1:

		32: {bucketName: bucket, objName: "emptydir/", inputData: []byte{}, expectedMd5: getMD5Hash([]byte{})},

		// With invalid crc32.
		33: {
			bucketName: bucket, objName: object, inputData: []byte("abcd"),
			inputMeta:     map[string]string{"etag": "e2fc714c4727ee9395f324cd2e7f331f", "x-amz-checksum-crc32": "abcd"},
			inputDataSize: int64(len("abcd")),
		},
	}
	for i, testCase := range testCases {