docs: function (sessionKey) {
          //The first 16 bytes (MSB first) will be the key, the next 16 bytes (MSB first) will be the initialization vector (IV), and the final 8 bytes (MSB first) will be the salt.
          var key = new Buffer(16); //just the key... +8); //key plus salt
          var iv = new Buffer(16); //initialization vector
  
          sessionKey.copy(key, 0, 0, 16); //copy the key
          //sessionKey.copy(key, 16, 32, 40); //append the 8-byte salt?
          sessionKey.copy(iv, 0, 16, 32); //copy the iv
  
          //are we not be doing something with the salt here?
  
          return crypto.createDecipheriv('aes-128-cbc', key, iv);
      }