Checksum help

Hello, I'm trying to add a checksum into my source code to prevent people from tampering with some of the images to give them an advantage over others. I was wondering if anyone might be able to point me in the right direction, this is my first time dealing with checksums.
A checksum is just where you add up all the bits in a file basically. Generally you don't do this for the whole file however, you just test a small part.

http://en.wikipedia.org/wiki/Checksum
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