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);
}
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 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 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 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 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 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;
}
