Simple Login system using QSslSocket

Lately I have been testing and analyzing different solutions regarding the user login and registration requests from the client to the database server. These are some of the libraries/packages that I have implemented and utilized:
• Unity MySQL Package http://forum.unity3d.com/threads/63364-Unity-with-MySQL
• MySQL C++ Connector http://www.mysql.com/downloads/connector/
• QT -- QSslSocket http://qt-project.org/doc/qt-4.8/qsslsocket.html
At the beginning of the week I started to look into the Unity MySQL package. This was a really straight-forward and easy to use implementation that lets the user directly connect to the database and send simple queries to retrieve or update data in different tables. However, even if this solution brought many advantageous features such as easy implementation and solid documentation I had to trash because there was no way for me to ensure the security.
In the end I decided to use the QT framework along with their QSslSocket to ensure robust encryption between the different endpoints. At the moment my solution includes one client and one server prototype QT library that is used for communication and login requests. I haven't been working that much with the secure data transfer, as I wanted to check how the implementation worked before digging too deep into it. Some of the client functions are exported as extern C functions and a dynamic library is built to enable the connection to C# and Unity 4.

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