/// <summary>
/// Sends an encrypted message to each connected client in the chat
/// with their public key
/// </summary>
/// <param name="message"></param>
public void SendMessage(Message message)
{
//convert message to XML
string messageXml = Message.ToXML(message);
List <ConnectedClientEncryptedMessage> clientEncryptedMessages = new List <ConnectedClientEncryptedMessage>();
foreach (ConnectedClient client in this.GetConnectedClients())
{
string key = "";
string IV = "";
string clientEncryptedMessage = Cryptor.AesEncrypt(messageXml, ref key, ref IV);
string encryptedKey = Cryptor.RsaEncrypt(key, client.PublicKey);
string encryptedIV = Cryptor.RsaEncrypt(IV, client.PublicKey);
clientEncryptedMessages.Add(new ConnectedClientEncryptedMessage(client.UniqueID, this.UniqueID, encryptedKey, encryptedIV, clientEncryptedMessage));
}
JsonPacket packet = new JsonPacket(Constants.REQUEST_CLIENT_SEND_CHAT_MESSAGE);
packet.Add("CLIENT_UNIQUE_ID", Client.Get().UniqueID);
packet.Add("CLIENT_TOKEN", Client.Get().Token);
packet.Add("CHAT_UNIQUE_ID", this.UniqueID);
//attach client encryptedMessages
packet.Add("CHAT_CLIENT_MESSAGES", JsonConvert.SerializeObject(clientEncryptedMessages));
JsonPacket response = Request.Send(packet);
//TODO: check response for errors
}
/// <summary>
/// Checks the server for client messages sent by other users it then decrypts these messages storing them
/// in the chat
/// </summary>
public void CheckForMessages()
{
JsonPacket packet = new JsonPacket(Constants.REQUEST_CHAT_CHECK_MESSAGE);
packet.Add("CLIENT_UNIQUE_ID", Client.Get().UniqueID);
packet.Add("CLIENT_TOKEN", Client.Get().Token);
packet.Add("CHAT_UNIQUE_ID", this.UniqueID);
JsonPacket response = Request.Send(packet);
string messagesJSON = response.Data["MESSAGES"];
List <ConnectedClientEncryptedMessage> messages = JsonConvert.DeserializeObject <List <ConnectedClientEncryptedMessage> >(messagesJSON);
if (messages.Count > 0)
{
foreach (var message in messages)
{
string decryptedKey = Cryptor.RsaDecrypt(message.EncryptedAESKey, Client.Get().CryptographicKeyPair.PrivateKey);
string decryptedIV = Cryptor.RsaDecrypt(message.EncryptedAESIV, Client.Get().CryptographicKeyPair.PrivateKey);
Message msg = Message.FromXML(Cryptor.AesDecrypt(message.EncryptedMessage, decryptedKey, decryptedIV));
if (!Messages.Any(k => k.UniqueID == msg.UniqueID))
{
Messages.Add(msg);
}
}
}
}
public Message(string sender, string content)
{
UniqueID = Cryptor.GenerateRandomString(16, true);
Sender = sender;
Content = content;
}