Java Utililty Methods Hash Code Calculate

List of utility methods to do Hash Code Calculate

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Description

The list of methods to do Hash Code Calculate are organized into topic(s).

Method

intcombineHashesUnsorted(final int a, final int b)
Combine two hash codes. 
return (a + b);
byte[]generateHash(byte[] data)
generate Hash 
MessageDigest sha = null;
try {
    sha = MessageDigest.getInstance("SHA-256");
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
sha.update(data);
return sha.digest();
...
byte[]generateHash(char[] password, byte[] salt)
generate Hash 
PBEKeySpec spec = new PBEKeySpec(password, salt, HASH_ITERATIONS, KEY_LENGTH);
Arrays.fill(password, Character.MIN_VALUE);
try {
    SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
    return skf.generateSecret(spec).getEncoded();
} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
    throw new AssertionError("Error while hashing a password: " + e.getMessage(), e);
} finally {
...
byte[]generateHash(File file)
generate Hash 
InputStream in = new BufferedInputStream(new FileInputStream(file));
byte hash[] = null;
try {
    hash = generateHash(in);
} finally {
    in.close();
return hash;
...
StringgenerateHash(final String data)
generate Hash 
String result = null;
StringBuffer toHash = new StringBuffer();
toHash.append(data);
toHash.append(SECRET_SALT);
try {
    byte[] bytesOfMessage = toHash.toString().getBytes("UTF-8");
    MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] thedigest = md.digest(bytesOfMessage);
...
StringgenerateHash(final String input)
Generates a hashed string in MD5-format for the given string. 
MessageDigest messageDigest;
try {
    messageDigest = MessageDigest.getInstance("MD5");
    messageDigest.update(input.getBytes(), 0, input.length());
    return new BigInteger(1, messageDigest.digest()).toString(16);
} catch (final NoSuchAlgorithmException e) {
    e.printStackTrace();
    throw new RuntimeException("No such hash algorithm!");
...
StringgenerateHash(final String msg, final String hashAlgorithm)
generate Hash 
if (!hashAlgorithm.equals("plain")) {
    StringBuffer hexString = new StringBuffer();
    try {
        MessageDigest messageDigest = MessageDigest.getInstance(hashAlgorithm);
        messageDigest.update(msg.getBytes());
        byte[] digest = messageDigest.digest();
        for (byte aDigest : digest) {
            String val = Integer.toHexString(0xFF & aDigest);
...
byte[]generateHash(String algo, byte[]... bytes)
generate Hash 
MessageDigest digest = MessageDigest.getInstance(algo);
for (int i = 0; i < bytes.length; ++i) {
    digest.update(bytes[i]);
return digest.digest();
StringgenerateHash(String input)
Pre: input!=null Post: Genera un Hash para el texto pasado. 
String md5 = null;
if (null == input)
    return null;
try {
    MessageDigest digest = MessageDigest.getInstance("MD5");
    digest.update(input.getBytes(), 0, input.length());
    md5 = new BigInteger(1, digest.digest()).toString(16);
} catch (NoSuchAlgorithmException e) {
...
StringgenerateHash(String input, String salt)
generate Hash 
MessageDigest md = MessageDigest.getInstance("MD5");
String hash = "";
if (salt == null) {
    salt = "";
input += salt;
byte[] data = input.getBytes("US-ASCII");
md.update(data);
...