Following on from this question (which asks how to retrieve a Windows Product Key), there seems to be conflicting information obtained from the various methods. This question asks why is there a difference when they should all return the same value?
These two methods ...
POWERSHELL
(Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey
CMD
wmic path softwarelicensingservice get OA3xOriginalProductKey
return a different result to this VBS script ...
Set WshShell = CreateObject("WScript.Shell")
MsgBox ConvertToKey(WshShell.RegRead("HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId"))
Function ConvertToKey(Key)
Const KeyOffset = 52
i = 28
Chars = "BCDFGHJKMPQRTVWXY2346789"
Do
Cur = 0
x = 14
Do
Cur = Cur * 256
Cur = Key(x + KeyOffset) + Cur
Key(x + KeyOffset) = (Cur \ 24) And 255
Cur = Cur Mod 24
x = x - 1
Loop While x >= 0
i = i - 1
KeyOutput = Mid(Chars, Cur + 1, 1) & KeyOutput
If (((29 - i) Mod 6) = 0) And (i <> -1) Then
i = i - 1
KeyOutput = "-" & KeyOutput
End If
Loop While i >= 0
ConvertToKey = KeyOutput
End Function
POWERSHELL and CMD agree with each other, but the VBS script shows a different value.
Any ideas why this might be?
UPDATE - Nearly there!!
The following PowerShell script gets the same product key as the PowerShell and Cmd commands. It appears that something has changed in the way the values are encoded (I've not had time to ascertain what that change is yet)
function Get-ProductKey {
<#
.SYNOPSIS
Retrieves the product key and OS information from a local or remote system/s.
.Description
Retrieves the product key and OS information from a local or remote system/s. Queries of 64bit OS from a 32bit OS will result in
inaccurate data being returned for the Product Key. You must query a 64bit OS from a system running a 64bit OS.
.Parameter ComputerName
Name of the local or remote system/s.
.Notes
Author: Boe Prox
Version: 1.1
-Update of function from http://powershell.com/cs/blogs/tips/archive/2012/04/30/getting-windows-product-key.aspx
-Added capability to query more than one system
-Supports remote system query
-Supports querying 64bit OSes
-Shows OS description and Version in output object
-Error Handling
.EXAMPLE
Get-ProductKey -Computername Server1
OSDescription Computername OSVersion ProductKey
------------- ------------ --------- ----------
Microsoft(R) Windows(R) Server 2003, Enterprise Edition Server1 5.2.3790 bcdfg-hjklm-pqrtt-vwxyy-12345
Description
-----------
Retrieves the product key information from 'Server1'
#>
[cmdletbinding()]
Param (
[parameter(ValueFromPipeLine=$True,ValueFromPipeLineByPropertyName=$True)]
[Alias("CN","__Server","IPAddress","Server")]
[string[]]$Computername = $Env:Computername
)
Begin {
$map="BCDFGHJKMPQRTVWXY2346789"
}
Process {
ForEach ($Computer in $Computername) {
Write-Verbose ("{0}: Checking network availability" -f $Computer)
If (Test-Connection -ComputerName $Computer -Count 1 -Quiet) {
Try {
Write-Verbose ("{0}: Retrieving WMI OS information" -f $Computer)
$OS = Get-WmiObject -ComputerName $Computer Win32_OperatingSystem -ErrorAction Stop
} Catch {
$OS = New-Object PSObject -Property @{
Caption = $_.Exception.Message
Version = $_.Exception.Message
}
}
Try {
Write-Verbose ("{0}: Attempting remote registry access" -f $Computer)
$remoteReg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey([Microsoft.Win32.RegistryHive]::LocalMachine,$Computer)
$value = $remoteReg.OpenSubKey("SOFTWARE\Microsoft\Windows NT\CurrentVersion").GetValue('DigitalProductId')[0x34..0x42]
$isWin8OrNewer = [math]::Floor(($value[14] / 6)) -band 1
$value[14] = ($value[14] -band 0xF7) -bor (($isWin8OrNewer -band 2) * 4)
$ProductKey = ""
Write-Verbose ("{0}: Translating data into product key" -f $Computer)
for ($i = 24; $i -ge 0; $i--) {
$r = 0
for ($j = 14; $j -ge 0; $j--) {
$r = ($r * 256) -bxor $value[$j]
$value[$j] = [math]::Floor([double]($r/24))
$r = $r % 24
}
$ProductKey = $map[$r] + $ProductKey
}
} Catch {
$ProductKey = $_.Exception.Message
}
if ($isWin8OrNewer){
$ProductKey = $ProductKey.Remove(0, 1)
$ProductKey = $ProductKey.Insert($r, 'N')
}
#insert dashes to make key more readable
for($i = 5; $i -lt 29; $i = $i + 6){
$ProductKey = $ProductKey.Insert($i, '-')
}
$object = New-Object PSObject -Property @{
Computername = $Computer
ProductKey = $ProductKey
OSDescription = $os.Caption
OSVersion = $os.Version
}
$object.pstypenames.insert(0,'ProductKey.Info')
$object
} Else {
$object = New-Object PSObject -Property @{
Computername = $Computer
ProductKey = 'Unreachable'
OSDescription = 'Unreachable'
OSVersion = 'Unreachable'
}
$object.pstypenames.insert(0,'ProductKey.Info')
$object
}
}
}
}
The above script was taken from here, but takes into account the change suggested by TJ in the comments at the bottom, dated Feb 5th 2016. That guy is a legend! Well, the original author too, clearly!
I will post the VB version when I have created it, assuming this question doesn't get closed (only 3 more votes required so act quickly people) /sarcasm.
