Java Utililty Methods Checksum Calculate

long result = 0;
try {
    ByteArrayInputStream bais = new ByteArrayInputStream(buffer, offset, length);
    CheckedInputStream cis = new CheckedInputStream(bais, new Adler32());
    byte readBuffer[] = new byte[length];
    cis.read(readBuffer, 0, length);
    result = cis.getChecksum().getValue();
} catch (Exception e) {
...

if (file.isDirectory()) {
    return 0L;
CheckedInputStream cis = null;
try {
    cis = new CheckedInputStream(new FileInputStream(file), new Adler32());
    final byte[] tempBuf = new byte[8192];
    final Thread currentThread = Thread.currentThread();
...

MessageDigest dig = MessageDigest.getInstance("sha-256");
byte[] bytes = Files.readAllBytes(Paths.get(filePath));
byte[] resDig = dig.digest(bytes);
String b = DatatypeConverter.printHexBinary(resDig);
return b.toLowerCase();

BufferedInputStream bufferedInputStream = null;
try {
    bufferedInputStream = new BufferedInputStream(new FileInputStream(file));
    return getChecksumAlder32(bufferedInputStream);
} catch (IOException e) {
    throw e;
} finally {
    if (bufferedInputStream != null) {
...

Map<String, Long> checkSums = new HashMap<String, Long>();
ZipFile zipFile = new ZipFile(archiveFile);
Enumeration<? extends ZipEntry> e = zipFile.entries();
while (e.hasMoreElements()) {
    ZipEntry entry = e.nextElement();
    checkSums.put(entry.getName(), entry.getCrc());
return checkSums;
...