I'm trying to discover the algorithm of a lost software, there is an equipment that requiest some data, and validates the data using the "KEY", if you change any parameter of the data then you need a valid KEY.
The data is composed of 4 int values and the KEY is a HEX of 6-digits.
param1 param2 param3 param4 KEY 5669 30/06/2014 187769 960 0xA34108 5812 31/01/2015 233789 960 0xFAE094 5812 31/01/2015 233859 960 0x176471 6437 30/06/2015 368923 10000 0x35E6C2 6468 31/07/2015 398013 10000 0x404818 6161 30/09/2015 312581 960 0x9A59BC 6161 30/09/2015 311298 960 0xEC454C 6655 31/12/2016 448758 960 0x??????
I suspect the the algorithm is a type of CRC, because in the software you was able to enter something like a seed of 4-digits HEX in a field called CRC:
By the KEYs length I think it should be a CRC-24, but the software was using 4-lenght so is not the xor-in nor xor-out of the CRC-24.
I have tested on Python[crcmod] by bruteforce, all parameters combinations to use as input data and all combinations[
0xFFFFFF] of possible seed and xor-out for the CRC-24.
I also tried to find the equation by curve-fitting but no luck, the relation seams unpredictable.
I know there are many CRC versions: polynomials, hash-tables, etc. Anyone have idea of the the CRC version or algorithm that could be used here?