Sign-ISEScript.ps1

#requires -version 2.0

 
Function Write-Signature {

Param()

Set-StrictMode -Version Latest

#get the certificate
$cert = Get-ChildItem -Path cert:\currentuser\my -CodeSigningCert
if ($cert) {

    #save the file if necessary
    if (!$psise.currentfile.IsSaved) {
     $psise.CurrentFile.Save()
    }

    #if the file is encoded as BigEndian, resave as Unicode
    if ($psise.currentfile.encoding.encodingname -match "Big-Endian") {
        $psise.CurrentFile.Save([Text.Encoding]::Unicode) | Out-Null
    }

    #save the filepath for the current file so it can be re-opened later
    $filepath=$psise.CurrentFile.FullPath

    #sign the file
    Try {
      Set-AuthenticodeSignature -FilePath $filepath -Certificate $cert -errorAction Stop
      #close the file
      $psise.CurrentPowerShellTab.Files.remove($psise.currentfile) | Out-Null             
  
      #reopen the file
      $psise.CurrentPowerShellTab.Files.add($filepath)  | out-null             
    }
    Catch {
      Write-Warning ("Script signing failed. {0}" -f $_.Exception.message)
    }

} #if code cert found 

else {
    Write-Warning "No code signing certificate found."
}
} #end function