How to encrypt and decrypt a file with Qt/C++?

I want to create a program, which can encrypt and decrypt a complete file with an individual password. Is there any way to manage this in Qt and/or C++ and how?

Solution

I've never used it myself, but I've heard great things about QCA. It's cross platform, uses a Qt-style API and Qt datatypes.

My C code works fine but crashes right before the end (0xC0000374)
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