PowerShell小技巧之读取Windows产品密钥

之前大多数人可能用过vbs读取windows产品密钥的vbs脚本，vbs脚本通常都比较隐晦、难懂，今天忙里偷闲，随手写了一个用于读取windows产品密钥的powershell脚本。

代码如下：

 =====文件名：get-windowsproductkey.ps1=====
function get-windowsproductkey([string]$computer)
{

$comments
author:fuhj(powershell#live.cn ,http://fuhaijun.com)
example: get-windowsproductkey .
'@
$reg = [wmiclass] ("\\" + $computer + "\root\default:stdregprov")
$values = [byte[]]($reg.getbinaryvalue(2147483650,"software\microsoft\windows nt\currentversion","digitalproductid").uvalue)
$lookup = [char[]]("b","c","d","f","g","h","j","k","m","p","q","r","t","v","w","x","y","2","3","4","6","7","8","9")
$keystartindex = [int]52;
$keyendindex = [int]($keystartindex + 15);
$decodelength = [int]29
$decodestringlength = [int]15
$decodedchars = new-object char[] $decodelength
$hexpid = new-object system.collections.arraylist
for ($i = $keystartindex; $i -le $keyendindex; $i++){ [void]$hexpid.add($values[$i]) }
for ( $i = $decodelength - 1; $i -ge 0; $i--)
    {
     if (($i + 1) % 6 -eq 0){$decodedchars[$i] = '-'}
     else
       {
        $digitmapindex = [int]0
        for ($j = $decodestringlength - 1; $j -ge 0; $j--)
        {
            $bytevalue = [int](($digitmapindex * [int]256) -bor [byte]$hexpid[$j]);
            $hexpid[$j] = [byte] ([math]::floor($bytevalue / 24));
            $digitmapindex = $bytevalue % 24;
            $decodedchars[$i] = $lookup[$digitmapindex];
         }
        }
     }
$str = ''
$decodedchars | % { $str+=$_}
$str
}

get-windowsproductkey .

执行效果如下：