Generate MAC

To generate a MAC:

1. Get an instance of a Mac object. Pass the algorithm as an argument.

2. Obtain an instance of the key.

3. Initialize the Mac object.

4. Convert the plaintext to a byte array and invoke the doFinal method of the Mac object to create the MAC.

Code sample

The following code sample uses the HmacSHA1 algorithm to create a MAC of the string password.

Mac mac = Mac.getInstance("HmacSHA1", "IngrianProvider");
SecretKey key = NAEKey.getSecretKey("mackey");
mac.init(key);
byte[] mactext = mac.doFinal("password".getBytes());