Public/System/Get-WindowsKey.ps1
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function Get-WindowsKey { <# .SYNOPSIS Retrieves the Windows product key and OS information from local or remote computers. .DESCRIPTION The Get-WindowsKey function retrieves the Windows product key by decoding the DigitalProductId from the registry. It also collects additional operating system information such as OS version, build number, architecture, and registration details. This function can target local or remote computers and returns comprehensive information about each system's Windows installation. .PARAMETER ComputerName Specifies the target computers to query. Default is the local computer. Can accept multiple computer names or IP addresses. .PARAMETER Credential Specifies the credential object to use for authentication when connecting to remote computers. Not required for local computer access or when using current credentials. .EXAMPLE Get-WindowsKey Retrieves the Windows product key and OS information from the local computer. .EXAMPLE Get-WindowsKey -ComputerName "Server01", "Server02" Retrieves the Windows product key and OS information from two remote servers. .EXAMPLE Get-WindowsKey -ComputerName "Server01" -Credential (Get-Credential) Prompts for credentials and uses them to retrieve the Windows product key from a remote server. .EXAMPLE "Server01", "Server02" | Get-WindowsKey | Export-Csv -Path "C:\WindowsKeys.csv" -NoTypeInformation Retrieves Windows product keys from multiple servers and exports the results to a CSV file. .NOTES Original concept by Jakob Bindslet (jakob@bindslet.dk) Enhanced with modern PowerShell techniques and improved error handling this makes the function faster and more robust. The digital product key decoding algorithm works on Windows XP through Windows 11. Remote access requires appropriate permissions and network connectivity. Author: Michiel VH #> [CmdletBinding()] param ( [Parameter(ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true, Position=0)] [Alias("Computer", "ComputerName", "HostName")] [string[]]$Targets = ".", [Parameter()] [System.Management.Automation.PSCredential] [System.Management.Automation.Credential()] $Credential ) Begin { Write-Verbose "Starting Get-WindowsKey function" $hklm = 2147483650 # HKEY_LOCAL_MACHINE $regPath = "Software\Microsoft\Windows NT\CurrentVersion" $regValue = "DigitalProductId" # Character set for the Windows product key $charsArray = "B","C","D","F","G","H","J","K","M","P","Q","R","T","V","W","X","Y","2","3","4","6","7","8","9" } Process { Foreach ($target in $Targets) { Write-Verbose "Processing computer: $target" try { # Create hashtable for WMI parameters $wmiParams = @{ ComputerName = $target ErrorAction = 'Stop' } # Add credentials if specified if ($Credential) { $wmiParams.Add('Credential', $Credential) } # Check if target is local machine or remote if ($target -eq "." -or $target -eq "localhost" -or $target -eq $env:COMPUTERNAME) { # Access registry directly on local machine for better performance Write-Verbose "Accessing local registry" try { $regKey = [Microsoft.Win32.RegistryKey]::OpenBaseKey([Microsoft.Win32.RegistryHive]::LocalMachine, [Microsoft.Win32.RegistryView]::Default) $regSubKey = $regKey.OpenSubKey($regPath) if ($regSubKey) { $digitalProductId = $regSubKey.GetValue($regValue) if ($digitalProductId) { $binArray = $digitalProductId[52..66] } else { Write-Warning "DigitalProductId value not found in registry on $target" continue } } else { Write-Warning "Windows NT registry key not found on $target" continue } } catch { Write-Warning "Error accessing local registry on $target`: $_" continue } } else { # Use WMI for remote registry access Write-Verbose "Accessing remote registry via WMI" try { $wmi = Get-WmiObject -Class "StdRegProv" -Namespace "root\default" @wmiParams $data = $wmi.GetBinaryValue($hklm, $regPath, $regValue) if (-not $data -or -not $data.uValue) { Write-Warning "Failed to retrieve product key data from $target" continue } $binArray = ($data.uValue)[52..66] } catch { Write-Warning "Error connecting to $target`: $_" continue } } # Decode the product key $productKey = $null try { # Decrypt base24 encoded binary data For ($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 } } } catch { Write-Warning "Error decoding product key on $target`: $_" $productKey = "DECODE-ERROR" } # Get OS Details try { # Get OS info using CIM on newer systems or WMI as fallback $osInfoParams = $wmiParams.Clone() $win32os = Get-CimInstance -ClassName Win32_OperatingSystem @osInfoParams -ErrorAction Stop } catch { try { $win32os = Get-WmiObject -Class Win32_OperatingSystem @wmiParams } catch { Write-Warning "Error retrieving OS information from $target`: $_" # Create minimal object if OS info collection fails $win32os = [PSCustomObject]@{ Caption = "Unknown" CSDVersion = "Unknown" OSArchitecture = "Unknown" BuildNumber = "Unknown" RegisteredUser = "Unknown" SerialNumber = "Unknown" } } } # Create and return the output object with OS and product key information [PSCustomObject]@{ Computer = $target Caption = $win32os.Caption Version = $win32os.Version CSDVersion = $win32os.CSDVersion OSArchitecture = $win32os.OSArchitecture BuildNumber = $win32os.BuildNumber RegisteredTo = $win32os.RegisteredUser ProductID = $win32os.SerialNumber ProductKey = $productKey InstallDate = if ($win32os.InstallDate) { [System.Management.ManagementDateTimeConverter]::ToDateTime($win32os.InstallDate) } else { $null } } } catch { Write-Error "An unexpected error occurred while processing $target`: $_" } } } End { Write-Verbose "Get-WindowsKey function completed" } } |