Calculate a MD5 sum of a string

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

   public String getMD5(String input) {

        try {

            MessageDigest md = MessageDigest.getInstance("MD5");

            byte[] messageDigest = md.digest(input.getBytes());

            BigInteger number = new BigInteger(1, messageDigest);

            String hashtext = number.toString(16);

            // Now we need to zero pad it if you actually want the full 32 chars.

            while (hashtext.length() < 32) {

                hashtext = "0" + hashtext;

            }

            return hashtext;

        }

        catch (NoSuchAlgorithmException e) {

            throw new RuntimeException(e);

        }

    }