public static int Establish(ref byte[] EncryptionKeyServer, ref byte[] Salt, HenkTcpClient Client, string Password, string UserName, RSAKey RSAKey) { try { EncryptionKeyServer = Encryption.RSA.Decrypt(Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 1 }, RSAKey.PublicKey), TimeSpan.FromSeconds(TIMESPAN)).Data, RSAKey.PrivateKey); Client.SetEncryption(Aes.Create(), EncryptionKeyServer); Salt = Client.WriteAndGetReply(new byte[] { 42, 2 }, TimeSpan.FromSeconds(1)).DecryptedData; Rfc2898DeriveBytes HashedPassword = new Rfc2898DeriveBytes(Password, Salt, 250000); byte ValidPassword = Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 3 }, HenkTcp.Encryption.Encrypt(Aes.Create(), HashedPassword.GetBytes(20), EncryptionKeyServer)), TimeSpan.FromSeconds(TIMESPAN)).Data[0]; if (ValidPassword.Equals(1)) { byte ValidUserName = Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 4 }, AES256.encrypt(UserName, Password, Salt)), TimeSpan.FromSeconds(TIMESPAN)).Data[0]; if (ValidUserName.Equals(1)) { return(3); //evrything ok } else { Client.Disconnect(); return(2); } //UserName already taken } else { Client.Disconnect(); return(1); } //Wrong password } catch { return(0); }//server did not reply on a message }