Java Utililty Methods Hash Calculate

return (x * 1000) + y;

Calculate the hash code.

final int prime = 31;
final int offset = 32;
int result = 1;
for (Long id : ids) {
    if (id != null) {
        result = prime * result + (int) (id ^ (id >>> offset));
return result;

long h = 0;
long g;
int pos = 0;
while (pos < str.length()) {
    h = (h << 4) + str.charAt(pos++);
    if ((g = (h & 0xf0000000)) != 0)
        h ^= g >> 24;
    h &= ~g;
...

if (a == null)
    return 0;
int result = 1;
for (byte b : a) {
    result = 31 * result + b;
return result;

try {
    MessageDigest messageDigest = MessageDigest.getInstance("MD5");
    return messageDigest.digest(bytes);
} catch (NoSuchAlgorithmException ex) {
    throw new IllegalStateException("Could not find MD5 MessageDigest instance", ex);

return getHash(bytes, 0, bytes.length);

return MessageDigest.getInstance("MD5").digest(data);

MessageDigest digest = MessageDigest.getInstance("MD5");
byte[] hash = digest.digest(data);
String hexHash = byte2hex(hash);
return hexHash;

byte[] tmp = new byte[20];
try {
    MessageDigest md = MessageDigest.getInstance("SHA-1");
    md.update(data, offset, length);
    md.digest(tmp, 0, tmp.length);
} catch (GeneralSecurityException e) {
    throw new RuntimeException("SHA-1 algorithm for MessageDigest not supported");
return tmp;

MessageDigest hash;
try {
    hash = MessageDigest.getInstance(HASH_ALGORITHM);
    hash.reset();
    hash.update(inputBytes);
    return hash.digest();
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
...