In the Windows SDK there is a CLI tool named computerhardwareids
The tool returns various GUIDs to select the proper HardwareId for the specific case.
This is the output that returns this tool in my PC:
Using the BIOS to gather information
Computer Information
--------------------
BIOS Vendor: American Megatrends Inc.
BIOS Version string: 1201
System BIOS Major Release: 4
System BIOS Minor Release: 6
System Manufacturer: To be filled by O.E.M.
System Family: To be filled by O.E.M.
System ProductName: To be filled by O.E.M.
SKU Number: SKU
Enclosure Type: 03 "Desktop"
Hardware IDs
------------
{a8670b03-1d98-5e95-ad4e-c64211eac9df} <- Manufacturer + Family + ProductName + SKUNumber + BIOS Vendor + BIOS Version + BIOS Major Release + BIOS Minor Release
{01c6b2a2-a2b2-58e4-906d-4677639f1a42} <- Manufacturer + Family + ProductName + BIOS Vendor + BIOS Version + BIOS Major Release + BIOS Minor Release
{dc5af3fe-c2de-539d-aafd-5061a1634723} <- Manufacturer + ProductName + BIOS Vendor + BIOS Version + BIOS Major Release + BIOS Minor Release
{d78b474d-dee0-5412-bc9d-e9f7d7783df2} <- Manufacturer + Family + ProductName + SKUNumber
{7ccbb6f1-9641-5f84-b00d-51ff218a4066} <- Manufacturer + Family + ProductName
{5a127cba-be28-5d3b-84f0-0e450d266d97} <- Manufacturer + SKUNumber
{6525c6e5-28e9-5f9c-abe4-20fd82504002} <- Manufacturer + ProductName
{6525c6e5-28e9-5f9c-abe4-20fd82504002} <- Manufacturer + Family
{482f3f58-6045-593a-9be4-611717ce4770} <- Manufacturer + Enclosure Type
{11b4a036-3b64-5421-a372-22c07df10a4d} <- Manufacturer
I would like to develop a generic use function that should mimic the functionality of that Microsoft tool, returning exactly the same HardwareIds (exactly the same).
I've found info on MSDN, all the output seems very documented and it contains info about the values that returns this tool, but it does not specify exactly what properties of the WMI classes are, it just says "Bios" and "System":
· ComputerHardwareIds Overview
· Specifying Hardware IDs for a Computer
I'm very lost, I can't find any values such as "Family", "BIOS Vendor", "Bios Major Release", "Bios Minor Release" and I'm not sure where the "SKU Number" refers to.
I Think these are the WMI Classes where the tool obtains part of all the data to make the guid:
· Win32_ComputerSystemProduct class
Note that the documentation also says this:
Each string is then converted into a GUID by using the SHA-1 hashing algorithm.
This is what I've tried to do, but I'm not sure whether i'm wrong with some concept or some values, it's incomplete and I also have problems with the Guis (explained with commentlines):
Private Function GetHardwareId() As Guid
Dim HardwareId As String = String.Empty
Dim BIOSVersion, BIOSVendor, BIOSMajorRelease, BIOSMinorRelease,
SystemManufacturer, SystemFamily, SystemProductName, SKUNumber As String
' Get System Info.
Using wmi As New Management.ManagementObjectSearcher("select * from Win32_ComputerSystem")
Using SystemInfo As Management.ManagementObject = wmi.Get(0)
SystemManufacturer = Convert.ToString(SystemInfo.Properties("Manufacturer").Value)
SystemProductName = Convert.ToString(SystemInfo.Properties("Model").Value)
SystemFamily = I don't know how to get it.
SKUNumber = I don't know how to get it.
End Using
End Using
' Get BIOS Info.
Using wmi As New Management.ManagementObjectSearcher("select * from Win32_BIOS")
Using BIOSInfo As Management.ManagementObject = wmi.Get(0)
BIOSVersion = Convert.ToString(BIOSInfo.Properties("SMBIOSBIOSVersion").Value)
BIOSVendor = I don't know how to get it.
BIOSMajorRelease = I don't know how to get it.
BIOSMinorRelease = I don't know how to get it.
End Using
End Using ' wmi
HardwareId = BIOSVersion & BIOSVendor & BIOSMajorRelease & BIOSMinorRelease &
SystemManufacturer & SystemFamily & SystemProductName & SKUNumber
' Here I call other method to encode the resulting string to SHA1 Hash
HardwareId = ConvertToSHA1(HardwareId)
' and then continue below...
' But this will not work,
' it throws an exception about missing "-" chars in the SHA1 string.
' So Microsoft formats "manualy" the SHA1 string to add some "-"?
Return Guid.Parse(HardwareId)
End Function
To generate the same GUIDs you need to get the values from SMBIOS (typically using GetSystemFirmwareTable), and then join them using the '&' char. Make sure the strings are encoded with UTF-16. You then need to use a type 5 (SHA-1) UUID generation scheme with 70ffd812-4c7f-4c7d-0000-000000000000 as the namespace.