public bool ChangeNick(string oldnick, string newnick, byte[] newnickhashed)
{
bool result = false;
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(oldnick);
if (user != null) //si l'utilisateur actuel existe
{
if (instance.SearchNick(newnick) == null) //si le nouveau login choisi est bon
{
ASCIIEncoding encoding = new ASCIIEncoding();
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
mycrypto.ImportParameters(user.Publickey);
if (mycrypto.VerifyData(encoding.GetBytes(newnick), newnickhashed)) //verification de la provenance du message
{
instance.RemoveUser(user);
user.Login = newnick;
instance.AddUser(user);
instance.Serialiser();
result = true;
}
}
}
return result;
}
public void TestMethodSerialization()
{
//on simule l'ajout d'auteur
User aut1 = new User("Toto", "mypass1");
User aut2 = new User("JC", "mypass2");
User aut3 = new User("Max", "mypass3");
User aut4 = new User("Titi", "clearstream");
User aut5 = new User("Toadd", "serie");
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
DSAParameters key = mycrypto.ExportParameters(false);
aut1.Publickey = key;
aut2.Publickey = key;
aut3.Publickey = key;
aut4.Publickey = key;
aut5.Publickey = key;
Message mess1 = new Message(aut1.Login, "Coucou ca va?");
Message mess2 = new Message(aut2.Login, "oue et toi?");
Message mess3 = new Message(aut3.Login, "tranquille!");
Message mess4 = new Message(aut1.Login, "ca va ca va");
Message mess5 = new Message(aut5.Login, "Test fifi");
Message mess6 = new Message(aut5.Login, "MessagePrive: cool ma poule?");
aut1.AddPrivateMessage(mess6);
//on simule
Chat toTest = new Chat();
Chat toOut = new Chat();
toTest.AddUser(aut1);
toTest.AddUser(aut2);
toTest.AddUser(aut3);
toTest.AddUser(aut4);
toTest.AddMessage(mess1);
toTest.AddMessage(mess2);
toTest.AddMessage(mess3);
toTest.AddMessage(mess4);
toTest.Serialiser();
toOut.Deserialiser();
toOut.AddUser(aut5);
toOut.AddMessage(mess5);
toOut.Serialiser();
//l'analyse du test se fera manuellement dans le fichier de sortie
}
public Message[] ReceiveAllMessage(string nick, byte[] nickhashed)
{
Chat instance = new Chat();
instance.Deserialiser();
Message[] message = null;
User user = instance.SearchNick(nick);
if (user != null) //on verifie si le demandeur existe
{
ASCIIEncoding encoding = new ASCIIEncoding();
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
mycrypto.ImportParameters(user.Publickey);
if (mycrypto.VerifyData(encoding.GetBytes(nick), nickhashed)) //on verifie la provenance de la demande
{
message = instance.Messages.ToArray<Message>();
}
}
return message;
}
public bool SendPrivateMessage(string nick, string recipient, string message, byte[] messagehashed)
{
bool result = false;
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(nick); //on verifie que l'auteur existe
if (user != null)
{
ASCIIEncoding encoding = new ASCIIEncoding();
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
mycrypto.ImportParameters(user.Publickey);
if (mycrypto.VerifyData(encoding.GetBytes(message), messagehashed)) //on verifie la provenance du message
{
Message news = new Message(nick, message);
User todeliver = instance.SearchNick(recipient); //on verifie la presence du destinataire
if (todeliver != null)
{
Message privatemessage = new Message(nick, message);
instance.RemoveUser(todeliver);
todeliver.AddPrivateMessage(privatemessage);
instance.AddUser(todeliver);
instance.Serialiser();
result = true;
}
}
}
return result;
}
public bool SendMessage(string nick, string message, byte[] messagehashed)
{
bool result = false;
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(nick); //verification de l'utilisateur
if (user != null)
{
ASCIIEncoding encoding = new ASCIIEncoding();
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
mycrypto.ImportParameters(user.Publickey);
if(mycrypto.VerifyData(encoding.GetBytes(message), messagehashed)) //on verifie que le message provient bien de l'utilisateur
{
Message news = new Message(nick, message);
instance.AddMessage(news);
instance.Serialiser();
result = true;
}
}
return result;
}
public bool Register(string nick, string password,byte[] nickhashed, int counter, byte[] G, byte[] J, byte[] P, byte[] Q, byte[] Seed, byte[] X, byte[] Y)
{
bool result = false;
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(nick);
if (user == null) //si l'utilisateur n'existe deja pas
{
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
DSAParameters key = Security.RecreateKey(counter, G, J, P, Q, Seed, X, Y);
mycrypto.ImportParameters(key);
ASCIIEncoding encoding = new ASCIIEncoding();
if (mycrypto.VerifyData(encoding.GetBytes(nick), nickhashed)) //verifie la cle publique recue
{
User newcommer = new User(nick, password, key);
instance.AddUser(newcommer);
instance.Serialiser();
result = true;
}
}
return result;
}
public Message[] ReceivePrivateMessage(string nick, byte[] nickhashed)
{
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(nick);
Message[] privatemessage = null;
if (user != null) //si l'utilisateur existe
{
ASCIIEncoding encoding = new ASCIIEncoding();
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
mycrypto.ImportParameters(user.Publickey);
if (mycrypto.VerifyData(encoding.GetBytes(nick), nickhashed)) //verification de la provenance du message
{
privatemessage = user.PrivateMessage.ToArray<Message>();
}
}
return privatemessage;
}
public Message[] ReceiveMessageNonRead(string nick, byte[] nickhashed)
{
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(nick);
Message[] unread = null;
if (user != null) //on verifie si l'utilisateur existe
{
ASCIIEncoding encoding = new ASCIIEncoding();
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
mycrypto.ImportParameters(user.Publickey);
if (mycrypto.VerifyData(encoding.GetBytes(nick), nickhashed)) //on verifie la provenance de la demande
{
//requete LINQ pour recuperer les messages a lire
unread = (from Message m in instance.Messages
where m.Creation > user.LastRead
select m).ToArray<Message>();
instance.RemoveUser(user);
user.LastRead = DateTime.Now; //on modifie la date de derniere lecture
instance.AddUser(user);
instance.Serialiser();
}
}
return unread;
}
public bool LogIn(string nick, string password,byte[] nickhashed, int counter, byte[] G, byte[] J, byte[] P, byte[] Q, byte[] Seed, byte[] X, byte[] Y)
{
bool result = false;
Chat instance = new Chat();
instance.Deserialiser();
User user = instance.SearchNick(nick);
if (user != null) //si l'utilisateur existe
{
if (user.CheckPassword(password)) //si le mot de passe de l'utilisateur est bon
{
DSACryptoServiceProvider mycrypto = new DSACryptoServiceProvider();
DSAParameters key = Security.RecreateKey(counter, G, J, P, Q, Seed, X, Y);
mycrypto.ImportParameters(key);
ASCIIEncoding encoding = new ASCIIEncoding();
if (mycrypto.VerifyData(encoding.GetBytes(nick), nickhashed)) //verification de la cle publique recue
{
result = true;
instance.RemoveUser(user);
user.Publickey = key; //on stocke la cle publique pour la reception prochaine de message
instance.AddUser(user);
instance.Serialiser();
}
}
}
return result;
}
