title: Decrypt packet in lua dissector
body: <p>I am working on a custom dissector for Wireshark in lua.</p>
  
  <p>Certain PDUs in the protocol is encrypted using AES and I would like to decrypt these so that I can show the clear content in Wireshark. Is this possible with a lua dissector and what APIs can I use to make the decryption?</p>
  
  <p>Or do I need to make a c/c++ dissector to make a dissector that decrypts data?</p>