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  KEY5669    30/06/2014  187769  960     0xA341085812    31/01/2015  233789  960     0xFAE0945812    31/01/2015  233859  960     0x1764716437    30/06/2015  368923  10000   0x35E6C26468    31/07/2015  398013  10000   0x4048186161    30/09/2015  312581  960     0x9A59BC6161    30/09/2015  311298  960     0xEC454C6655    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[0x000000-0xFFFFFF] 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?
find CRC algorithm, having some input and output data pairs
decryption;deobfuscation;crc