Get Windows key powershell script

getwinkey.ps

# not made by me, but useful
$dpid = Get-ItemProperty -Path "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion" -Name "DigitalProductId"

# Get the range we are interested in
$id = $dpid.DigitalProductId[52..(52+14)]

# Character table
$chars = "BCDFGHJKMPQRTVWXY2346789"

# Variable for the final product key
$pkey = ""

# Calculate the product key
for ($i=0; $i -le 24; $i++) {
    $c = 0

    for($j=14; $j -ge 0; $j--) {
        $c = ($c -shl 8) -bxor $id[$j]

        $id[$j] = [Math]::Floor($c / 24) -band 255

        $c = $c % 24
    }
    $pkey = $chars[$c] + $pkey
}
# Insert some dashes
for($i = 4; $i -gt 0; $i--) {
    $pkey = $pkey.Insert($i * 5, "-")
}
$pkey