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@bmatthewshea
Last active December 21, 2022 16:13
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PowerShell script to calculate current "ProductKey"
### "get-product-key.ps1":
### (updated from https://superuser.com/a/1367165)
###
### To allow this script to run, execute one of these in admin PS:
###
### Set-ExecutionPolicy RemoteSigned -Scope CurrentUser
### or
### Set-ExecutionPolicy RemoteSigned
###
### And then execute the following:
###
### Import-Module .\get-product-key.ps1; Get-WindowsKey
###
### You should see something similar to this:
###
### Computer : .
### Caption : Microsoft Windows 7 Professional
### CSDVersion : Service Pack 1
### OSArch : 64-bit
### BuildNumber : 7601
### RegisteredTo : somebody
### ProductID : 00000-OEM-9999999-99999
### ProductKey : 9Z9Z9-9Z9Z9-9Z9Z9-9Z9Z9-9Z9Z9
###
### The ProductKey will be shown last - as per above.
function Get-WindowsKey
{
param ($targets = ".")
$hklm = 2147483650
$regPath = "Software\Microsoft\Windows NT\CurrentVersion"
$regValue = "DigitalProductId"
Foreach ($target in $targets) {
$productKey = $null
$win32os = $null
$wmi = [WMIClass]"\\$target\root\default:stdRegProv"
$data = $wmi.GetBinaryValue($hklm,$regPath,$regValue)
$binArray = ($data.uValue)[52..66]
$charsArray = "B","C","D","F","G","H","J","K","M","P","Q","R","T","V","W","X","Y","2","3","4","6","7","8","9"
## decrypt base24 encoded binary data
For ($i = 24; $i -ge 0; $i--) {
$k = 0
For ($j = 14; $j -ge 0; $j--) {
$k = $k * 256 -bxor $binArray[$j]
$binArray[$j] = [math]::truncate($k / 24)
$k = $k % 24
}
$productKey = $charsArray[$k] + $productKey
If (($i % 5 -eq 0) -and ($i -ne 0)) {
$productKey = "-" + $productKey
}
}
$win32os = Get-WmiObject Win32_OperatingSystem -computer $target
$obj = New-Object Object
$obj | Add-Member Noteproperty Computer -value $target
$obj | Add-Member Noteproperty Caption -value $win32os.Caption
$obj | Add-Member Noteproperty CSDVersion -value $win32os.CSDVersion
$obj | Add-Member Noteproperty OSArch -value $win32os.OSArchitecture
$obj | Add-Member Noteproperty BuildNumber -value $win32os.BuildNumber
$obj | Add-Member Noteproperty RegisteredTo -value $win32os.RegisteredUser
$obj | Add-Member Noteproperty ProductID -value $win32os.SerialNumber
$obj | Add-Member Noteproperty ProductKey -value $productkey
$obj
}
}
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