public bool SendChatMessage(ChatMessage message, string target)
{
if (m_personalCryptoManagers.ContainsKey(target))
{
}
else
{
string keyBased = CryptoManager.GetAESKeyB64();
string response = SendMessageAndWaitResponseCrypted(ServerSpecificStrings.SendSessionKeyToUser(m_userName, target, keyBased));
if (response.Equals(ServerSpecificStrings.MesageOk))
{
return(StartNewChatSession(target, keyBased));
}
}
return(false);
}
bool StartNewChatSession(string username, string aesKey = "")
{
string keyBased = String.IsNullOrEmpty(aesKey) ? CryptoManager.GetAESKeyB64() : aesKey;
CryptoManager cm = new CryptoManager(keyBased);
if (m_personalCryptoManagers.ContainsKey(username))
{
m_personalCryptoManagers[username] = cm;
}
else
{
m_personalCryptoManagers.Add(username, cm);
}
return(true);
}
//Estabilish crypto tunnel and save session keys to CryptoManager object
static CryptoManager Handshake(Networker networker)
{
CryptoManager cryptoManager = null;
string AESKey = CryptoManager.GetAESKeyB64();
string response = networker.SendMessageAndWaitResponse(
CryptoManager.EncryptRSA2B64("message=handshake&key=" + AESKey)
);
if (!String.IsNullOrEmpty(response))
{
CryptoManager cryptoManagerTest = new CryptoManager(AESKey, response);
string responseConnected = ChatManager.SendMessageAndWaitResponseCrypted(ServerSpecificStrings.MesageOk, networker, cryptoManagerTest);
if (responseConnected.Equals(ServerSpecificStrings.MesageOk))
{
cryptoManager = cryptoManagerTest;
}
}
return(cryptoManager);
}
public bool AddChat(string chatname, string password)
{
if (String.IsNullOrEmpty(password))
{
string keyBased = CryptoManager.GetAESKeyB64();
string response = SendMessageAndWaitResponseCrypted(ServerSpecificStrings.SendSessionKeyToUser(m_userName, chatname, keyBased));
if (response.Equals(ServerSpecificStrings.MesageOk))
{
return(StartNewChatSession(chatname, keyBased));
}
}
else
{
string response = SendMessageAndWaitResponseCrypted(ServerSpecificStrings.SendMessageToEnterGroup(m_userName, chatname, password));
if (response.Equals(ServerSpecificStrings.MesageOk))
{
return(true);
}
}
return(false);
}
//Trying to get positive response from server, if all OK, then create ChatManager
//This function contains server-specific strings
public static ChatManager TryStartChatManager(Networker networker, string serverRequest)
{
CryptoManager cryptoManager = Handshake(networker);
if (cryptoManager != null)
{
//message = serverRequest
string response = ChatManager.SendMessageAndWaitResponseCrypted(serverRequest, networker, cryptoManager);
if (response.Equals(ServerSpecificStrings.MesageOk))
{
return(new ChatManager(networker, cryptoManager));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
public static string SendMessageAndWaitResponseCrypted(string message, Networker networker, CryptoManager cryptoManager)
{
string encryptedResponseB64 = networker.SendMessageAndWaitResponse(cryptoManager.EncryptWithSessionB64(message));
return(cryptoManager.DecryptWithSessionB64(encryptedResponseB64));
}
string SendMessageAndWaitResponseCrypted(string message, CryptoManager cryptoManager)
{
return(ChatManager.SendMessageAndWaitResponseCrypted(message, m_networker, cryptoManager));
}
