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aluigi, posted Sun Sep 07, 2014 5:49 pm (414)

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There is an useful script for QuickBMS that allows to perform a full CRC calculation/scanning.

It's very useful if you have an unknown crc and you would like to know on what data it's calculated or, moreover, what polynomial and other settings are used.

http://aluigi.org/papers/bms/crc_scan.bms

I have updated it just today, I added only the "reversed" visualization of the CRC so that you don't need to search your value two times in case it's displayed with a different endianess. This is the only thing I updated.

How to use:

Code:

quickbms.exe crc_scan.bms dump.dat > crc.txt

Where "dump.dat" is the file on which you want to calculate the crc.

Then open crc.txt and search the hexadecimal checksum that you expected, for example the crc located in an archive.

rhhab331, posted Sat Sep 24, 2016 7:14 pm (17623)

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Thanks for the work!

sharlatan, posted Wed Aug 07, 2019 6:56 pm (50196)

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hi. when i use Checksum / CRC scanning script this error show.
error in attach file.
how can i fix it?

aluigi, posted Sun Aug 11, 2019 5:53 pm (50259)

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crc_scan.bms must be in the current folder (E:\quickbms)

StreamThread, posted Fri Feb 21, 2020 9:05 pm (54149)

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Similar script for the strings CRC would be very helpful.

aluigi, posted Wed Mar 04, 2020 6:04 pm (54415)

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Just dump one of the strings as file and use crc_scan.bms on it.
Once you have found the correct algorithm and settings, you can work on other solutions (it depends by what you want to do).