Chattprogram

Structure

Contacts

Name	Type	Description
Log	Log	Used to store the chatlogs
ConnectionType	int	Used to keep track of what type of connection it is, 0: Web Connection, 1: Private Connection, 2: Host Connection
Name	string	Used to keep track of contacts for the user
Connected	bool	Used to keep track if contact has an established connection
Server	string	Used to keep track of which server to keep contact with, Only used when ConnectionType == 0
Username	string	Personal Username for webserver, as of now unused
IP	IPAdress	IP to connect to. Only used when ConnectionType == 1,
Port	int	Port to connect to.
stream	NetworkStream	stream to read/write to. Note lack of capitalization, please fix
Listener	Thread	Thread used to listen to stream
EncryptProvider	RSACryptoServiceProvider	RSACSP used to encrypt messages. Reciving Contacts DecryptProvider
DecryptProvider	RSACryptoServiceProvider	RSACSP used to decrypt messages. Reciving Contacts EncryptProvider

Log

Name	Type	Description
Text	Object[]	Object array used to contain text and images, could be renamed as variable was named before image functionality
ReadText	Object[]	Array used to check if anything new has arrived

Schedule

Communication

Initiating Contact

• Host has listening TCPListener
• Client connects to Host's TCPListener
• Both sides prepare DecryptProviders
• Host writes Host's DecryptProvider's public key. Client Reads and prepares their EncryptProvider
• Client writes Client's DecryptProvider's public key. Host Reads and prepares their EncryptProvider
• Host writes own AES key. Client Recieves and sets as own AES, note AES is symetrical i.e no public/private key
• Encrypted communication can now begin

Sending Images

• Sender sends [0,1,2,3,4] in binary, which is the constant used to warn that an image is comming. Can be changed, just need's to be unwritable in utf-8
• Sender sends image size
• Sender sends image encrypted with AES instead of RSA
• Communications return to normal

GUI

Update Contact list

• Save selected index.
• Clear list.
• Run through list of contacts and add them to the list. Check if nickname is set, else use suitable replacement
• Set selected index to last selected index.