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

Question

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?

Answer 1

www.cryptopp.com is a very complete C++ library with implementations of most algorithms.

The actual program (select file, read, obtain key, encrypt etc) should be piece of cake.