module Net::SSH::Transport::GCMCipher

algorithm, it MUST also be selected as the encryption algorithm.
Code (MAC) algorithm. Conversely, if AES-GCM is selected as the MAC
tunnel, AES-GCM MUST also be selected as the Message Authentication
If AES-GCM is selected as the encryption algorithm for a given
--- RFC 5647 ---

def implicit_mac?
  true
end