Lawrence D'Oliveiro wrote:
They could be using a strong cryptographic hash and truncating it to 16 bits
or something.
In which case you’ve got your work cut out for you...
Nope, I've determined that it's actually a pretty standard
CRC, and it's even using one of the standard polynomials,
0x8005. I'll explain the details of how I figured that
out in my essay.
What confused me initially is that it seems to be adding
a few extra bytes to the checked data that aren't present
in the file. Figuring out what they're supposed to contain
is proving to be quite a headache...
--
Greg
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