Convert-OctetStringToGUID.ps1

param([string]$valuetoconvert) 

 
function displayhelp  { 
    write-host "Please Supply the value you want converted" 
    write-host "Examples:" 
    write-host "To convert an Octet String to a GUID: Convert-OctetStringToGUID.ps1 'AFD34E23E358B0468CC12E1E86B3BF67'" 
    } 
 
if ($valuetoconvert -eq $NULL) { 
    DisplayHelp 
    return 
} 
# Convert OctetString (ms-ds-consistencyGuid value)
 

    if(32 -eq $valuetoconvert.Length)
    {
        [UInt32]$a = [Convert]::ToUInt32(($valuetoconvert.Substring(6, 2) + $valuetoconvert.Substring(4, 2) + $valuetoconvert.Substring(2, 2) + $valuetoconvert.Substring(0, 2)), 16)
        [UInt16]$b = [Convert]::ToUInt16(($valuetoconvert.Substring(10, 2) + $valuetoconvert.Substring(8, 2)), 16)
        [UInt16]$c = [Convert]::ToUInt16(($valuetoconvert.Substring(14, 2) + $valuetoconvert.Substring(12, 2)), 16)

        [Byte]$d = ([Convert]::ToUInt16($valuetoconvert.Substring(16, 2), 16) -as [byte])
        [Byte]$e = ([Convert]::ToUInt16($valuetoconvert.Substring(18, 2), 16) -as [byte])
        [Byte]$f = ([Convert]::ToUInt16($valuetoconvert.Substring(20, 2), 16) -as [byte])
        [Byte]$g = ([Convert]::ToUInt16($valuetoconvert.Substring(22, 2), 16) -as [byte])
        [Byte]$h = ([Convert]::ToUInt16($valuetoconvert.Substring(24, 2), 16) -as [byte])
        [Byte]$i = ([Convert]::ToUInt16($valuetoconvert.Substring(26, 2), 16) -as [byte])
        [Byte]$j = ([Convert]::ToUInt16($valuetoconvert.Substring(28, 2), 16) -as [byte])
        [Byte]$k = ([Convert]::ToUInt16($valuetoconvert.Substring(30, 2), 16) -as [byte])

        [Guid]$g = New-Object Guid($a, $b, $c, $d, $e, $f, $g, $h, $i, $j, $k)

	Write-Host "GUID"
        Write-Host $g.Guid;
    }
    else
    {
        throw Exception("Input string is not a valid octet string GUID")
    }