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It's also possible to obtain an arbitrary CRC32 by overwriting four consecutive bytes of the file (at any location of your choice) with the appropriate values. This paper should have everything you need (see in particular the C code at the end).


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One fundamental property of CRCs is that if you exclusive-or in the bit representation of the polynomial (which, for standard CRC-32, would be 0x0104C11DB7) anywhere in the message, you don't modify the CRC. So, the obvious thing for you to try is to exclusive-or that value (and similar, for example, the bit-reversed version of above) and see if that ...



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