hmac message encryption but using our own key
try { // Generate a key for the HMAC-MD5 keyed-hashing algorithm KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5"); SecretKey key = keyGen.generateKey(); // Generate a key for the HMAC-SHA1 keyed-hashing algorithm keyGen = KeyGenerator.getInstance("HmacSHA1"); key = keyGen.generateKey(); } catch ...