Create a Code Signing Certificate And Sign Scripts With PowerShell

In this blog post, I will show you how to create a code signing certificate and sign PowerShell scripts using PowerShell.

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In some cases and environments, you might need to and forced to sign your PowerShell script in order to run it.

Using the code in this post, I will show you how to do the following:

  • Create a code signing certificate
  • Sign a PowerShell script with the self-signed certificate.


Let’s start with creating a code signing certificate using the following PowerShell code which will use a variable called mycert.

$mycert = New-SelfSignedCertificate -Subject "My code signing cert" -Type
CodeSigningCert -CertStoreLocation "Cert:\CurrentUser\my"

Next, I will go ahead and sign a PowerShell script I have created before called signedscript.ps1  with the certificate we just created in the above code:

Set-AuthenticodeSignature -Certificate $mycert -FilePath .\signedscript.ps1 -Verbose

To check the certificate I will run the following cmdlet, however, you will notice that the status shows error and the reason you get it is because the certificate is self-signed.

Get-AuthenticodeSignature .\signedscript.ps1 | fl

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