Programming CRC value to flash

I'm trying to determine how to store a precalculated CRC value of my application to flash when I store the application, so that my application can verify the programmed CRC value against the flash contents.  I see in NowFlash that I can store to the OTP area (is that the best area for something like this?), but I'm at a loss as to how I would just get a single CRC value stored.  Is there any easy way to accomplish this or must I create a binary file from my single CRC value?