How to guess Checksum Algorithm Type? - checksum

Question

I am trying to figure out if what I have so far is correct. Just feeling that I am chasing my own tail here, but I do feel that maybe I understand it correctly.
I have this file, where it includes a checksum that is oddly short. This is a set of two files, this one and the one I copied at pastbin under. I noticed that the first file includes the checksum, however it seems that if I change any parameter or the serial number the file will than fail to load.
I am correct to assume that the software looks for some of the xml values add in a string and create the checksum, and than compares it to the checksum in the file? I am not sure how they would have been able to add the checksum in the file itself otherwise, so I guess maybe it just takes some of the values.
Second, am I correct to assume that they just truncated the checksum? I never seen one that small.
In the end I am trying to figure out how to create my own checksum calibration but at the moment I am trying to at minimum understand how it works. Far from braking it :)
<?xml version="1.0" encoding="utf-8"?>
<InstrumentData xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://schemas.datacontract.org/2004/07/AcquisitionEngine.Types">
<CalibrationMode>parabolic</CalibrationMode>
<CalibrationTemperatures
xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
<d2p1:double>28</d2p1:double>
<d2p1:double>52</d2p1:double>
<d2p1:double>76</d2p1:double>
<d2p1:double>90</d2p1:double>
</CalibrationTemperatures>
<Checksum>6E23D45E</Checksum>
<ClusterSize>1</ClusterSize>
<HardwareVariant>Hardware_Legacy</HardwareVariant>
<InstrumentID>undefined</InstrumentID>
<LineFrequency>LineFrequency_50Hz</LineFrequency>
<MaxCalibrationDeviation>0.152</MaxCalibrationDeviation>
<SerialNo>6328ZG200015</SerialNo>
<Version>3.2</Version>
</InstrumentData>
The second file is included here https://pastebin.com/YQ1qKZ2v
Update: I have been able to find the code that generates this but I am still not getting the same hash.
private string GenerateChecksum(string serialno)
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append(this.HardwareVariant);
stringBuilder.Append(serialno);
return HashGenerator.GetHash32AsHex(stringBuilder.ToString());
}
From this line it seems to take the HadwareVariant and the serial number.
Than it seems to take this and generate a hash32 and than add an X2 at the end of it? My background is php, but am I understand this correct?
internal static class HashGenerator
{
private static HashAlgorithm CryptographicHasher;
static HashGenerator()
{
HashGenerator.CryptographicHasher = MD5.Create();
}
public static int GetHash32(string value)
{
byte[] bytes = Encoding.UTF8.GetBytes(value);
return
BitConverter.ToInt32(HashGenerator.CryptographicHasher.ComputeHash(bytes), 0);
}
public static string GetHash32AsHex(string value)
{
return HashGenerator.GetHash32(value).ToString("X2");
}
}