public CSessionKeyResponse GetSessionKeyForChatConnection(CSessionParams sessionParams)
{
// get users from the data base
User retUser1FromDB = m_DBservice.getUserByName(sessionParams.client1UserName);
User retUser2FromDB = m_DBservice.getUserByName(sessionParams.client2UserName);
UserServiceData localUser = users_list[sessionParams.client1UserName];
UserServiceData partnerUser = users_list[sessionParams.client2UserName];
// check validity
if (retUser1FromDB == null || retUser2FromDB == null || localUser == null || partnerUser == null)
{
if (retUser1FromDB == null)
{
Console.Write(sessionParams.client1UserName + "not exist in DB");
}
if (retUser2FromDB == null)
{
Console.Write(sessionParams.client2UserName + "not exist in DB");
}
if (localUser == null)
{
Console.Write(sessionParams.client1UserName + "not logged in");
}
if (partnerUser == null)
{
Console.Write(sessionParams.client2UserName + "not logged in");
}
return(null);
}
// genrate new session key
byte[] sessionKey = CAes.NewKey();
//encrypt Eka [ Ks || || Kb[Ks] ]
byte[] encryptedDataForClientB = CAes.SimpleEncrypt(sessionKey, partnerUser.SessionKey, partnerUser.SessionKey); //Kb[Ks]
byte[] keyA = CAes.SimpleEncrypt(sessionKey, localUser.SessionKey, localUser.SessionKey); //Ka[Ks]
byte[] keyAB = CAes.SimpleEncrypt(encryptedDataForClientB, localUser.SessionKey, localUser.SessionKey); //Ka[clientB data]
// set return value
CSessionKeyResponse retVal = new CSessionKeyResponse();
retVal.m_sessionKeyA = keyA;
retVal.m_sessionKeyB = keyAB;
users_list[sessionParams.client1UserName].clientKdcCallBack.startChatSession(retUser2FromDB.ID + 1100, retUser2FromDB.Name, true);
users_list[sessionParams.client2UserName].clientKdcCallBack.startChatSession(retUser1FromDB.ID + 1100, retUser1FromDB.Name, false);
return(retVal);
}
private void getSessionKeyWorker_DoWork(object sender, DoWorkEventArgs e)
{
string partnerUsernameInvoked = string.Empty;
Dispatcher.BeginInvoke(new Action(delegate
{
partnerUsernameInvoked = connectedUserComboBox.Text;
}));
Thread.Sleep(100);
clientPrivateData user = ClientAllData.Instance.getMyClient();
CSessionParams sessionPrm = new CSessionParams();
sessionPrm.client1UserName = user.username;
sessionPrm.client2UserName = partnerUsernameInvoked;
CSessionKeyResponse sessionRespons = kdcProxy.GetSessionKeyForChatConnection(sessionPrm); // blocking
if (sessionRespons == null)
{
//report error
return;
}
Thread.Sleep(200);
setChatSessionKeyEvnt?.Invoke(this, sessionRespons);
/*byte[] sessionKey = CAes.SimpleDecrypt(sessionRespons.m_sessionKeyA, user.m_kdcAsSessionKey, user.m_kdcAsSessionKey);
* byte[] sessionPartnerData = CAes.SimpleDecrypt(sessionRespons.m_sessionKeyB, user.m_kdcAsSessionKey, user.m_kdcAsSessionKey);
* session sessionData = ClientAllData.Instance.getSession(partnerUsernameInvoked);
* sessionData.setSessionKey(sessionKey, sessionPartnerData);
* sessionData.startSending();*/
}
