public static String SHA512(String input)
{
    try {
        // getInstance() method is called with algorithm SHA-512
        MessageDigest md = MessageDigest.getInstance("SHA-512");

        // digest() method is called
        // to calculate message digest of the input string
        // returned as array of byte
        byte[] messageDigest = md.digest(input.getBytes());

        // Convert byte array into signum representation
        BigInteger no = new BigInteger(1, messageDigest);

        // Convert message digest into hex value
        String hashtext = no.toString(16);

        // Add preceding 0s to make it 32 bit
        while (hashtext.length() < 32) {
            hashtext = "0" + hashtext;
        }

        // return the HashText
        return hashtext;
    }

    // For specifying wrong message digest algorithms
    catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    }
}