Calcula o HASH de uma string e retorna o valor em uma HEX String

Utils.java

/**
* Returns the HexString of a String 
* eg.: hashDigest("hello") == "5d41402abc4b2a76b9719d911017c592"
* 
* @param input input string
* @param algorithm algorithm to be used to compute the hash ( eg.: "MD5", "SHA1", "SHA-256" )
* @return the hash of the input string
*/
public static String hashDigest(String input, String algorithm) 
{
	try 
	{
		MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
		messageDigest.update(input.getBytes());
		return new BigInteger(1, messageDigest.digest()).toString(16);
	} catch (NoSuchAlgorithmException e) {
		Logger.getLogger(Utils.class.getName()).log(Level.SEVERE, null, e);
	}
	return null;
}