// It then attempts to guess the specific format based on magic values.
// If the checksum fails, then FormatUnknown is returned.
func (b *block) getFormat() Format {
	// Verify checksum.
	var p parser
	value := p.parseOctal(b.toV7().chksum())
	chksum1, chksum2 := b.computeChecksum()
	if p.err != nil || (value != chksum1 && value != chksum2) {
		return FormatUnknown
	}

	// Another checksum type will be set.
	ChecksumTrailing ChecksumType = 1 << iota

	// ChecksumSHA256 indicates a SHA256 checksum.
	ChecksumSHA256
	// ChecksumSHA1 indicates a SHA-1 checksum.
	ChecksumSHA1
	// ChecksumCRC32 indicates a CRC32 checksum with IEEE table.
	ChecksumCRC32
	// ChecksumCRC32C indicates a CRC32 checksum with Castagnoli table.
	ChecksumCRC32C

				}
				return
			}
			myData := []byte("this-is-a-checksum-data-test")
			chksm := NewChecksumFromData(tt.checksum, myData)
			if chksm == nil {
				t.Fatalf("NewChecksumFromData failed for %s", tt.name)
			}
			if tt.fullobj {
				chksm.Type |= ChecksumFullObject
			}

			// CRC64NVME is always full object
			if chksm.Type.Base().Is(ChecksumCRC64NVME) {
				chksm.Type |= ChecksumFullObject
			}

./mc mb minio1/test-bucket --insecure

# Load objects to source site with checksum header
echo "Loading objects to source MinIO instance"
OBJ_CHKSUM=$(openssl dgst -sha256 -binary </tmp/data/obj | base64)
aws s3api --endpoint-url=https://localhost:9001 put-object --checksum-algorithm SHA256 --checksum-sha256 "${OBJ_CHKSUM}" --bucket test-bucket --key obj --body /tmp/data/obj --no-verify-ssl --profile enterprise

      distributionSha256Result=true
    fi
  elif command -v shasum >/dev/null; then
    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
      distributionSha256Result=true
    fi
  else
    echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available." >&2

	if _, ok := opts.ObjectAttributes[xhttp.Checksum]; ok {
		chkSums, _ := objInfo.decryptChecksums(0, r.Header)
		// AWS does not appear to append part number on this API call.
		if len(chkSums) > 0 {
			OA.Checksum = &objectAttributesChecksum{
				ChecksumCRC32:     strings.Split(chkSums["CRC32"], "-")[0],
				ChecksumCRC32C:    strings.Split(chkSums["CRC32C"], "-")[0],

          ^ strideTable[1][(word >>> 16) & 0xFF]
          ^ strideTable[0][word >>> 24];
    }

    static int combine(int csum, int crc) {
      csum ^= crc;
      for (int i = 0; i < 4; i++) {
        csum = (csum >>> 8) ^ byteTable[csum & 0xFF];
      }
      return csum;
    }

    private static final ByteBuffer EMPTY = ByteBuffer.allocate(0);
  }

		if serverSideChecksum != nil {
			fi.Checksum = serverSideChecksum.AppendTo(nil, nil)
			if opts.EncryptFn != nil {
				fi.Checksum = opts.EncryptFn("object-checksum", fi.Checksum)
			}
		}
	} else if fi.Checksum == nil && opts.WantChecksum != nil {
		// Trailing headers checksums should now be filled.
		fi.Checksum = opts.WantChecksum.AppendTo(nil, nil)
		if opts.EncryptFn != nil {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        writeLittleEndianInt(baos, PacSignature.KERB_CHECKSUM_HMAC_MD5);
        byte[] checksum = new byte[16];
        for (int i = 0; i < checksum.length; i++) {
            checksum[i] = (byte) i;
        }
        baos.write(checksum);
        byte[] data = baos.toByteArray();

        // Create PacSignature
        PacSignature pacSignature = new PacSignature(data);

    return toString;
  }

  /** Hasher that updates a checksum. */
  private final class ChecksumHasher extends AbstractByteHasher {
    private final Checksum checksum;

    private ChecksumHasher(Checksum checksum) {
      this.checksum = checkNotNull(checksum);
    }

    @Override
    protected void update(byte b) {
      checksum.update(b);
    }

    @Override