digest md5

String key = request.getParameter("key");
MessageDigest digest = MessageDigest.getInstance("MD5");
String secret = "xpto";// secret could change constantly
long tStamp = System.currentTimeMillis();
tStamp = tStamp - (tStamp % 15000);// valid for 15 seconds
System.out.println(tStamp);
digest.update((secret + ":" + tStamp).getBytes());
byte[] hash = digest.digest();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
for (byte b : hash)
ps.printf("%02x", 0xFF & b);
String pass = new String(baos.toByteArray());
System.out.println("key:\t" + key);
System.out.println("pass:\t" + pass);