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#requires -Version 5

# this is where the cert file will be saved
$Path = "$env:temp\codeSignCert.pfx"

# you'll need this password to load the PFX file later
$Password = Read-Host -Prompt 'Enter new password to protect certificate' -AsSecureString

# create cert, export to file, then delete again
$cert = New-SelfSignedCertificate -KeyUsage DigitalSignature -KeySpec Signature -FriendlyName 'IT Sec Department' -Subject CN=SecurityDepartment -KeyExportPolicy ExportableEncrypted -CertStoreLocation Cert:\CurrentUser\My -NotAfter (Get-Date).AddYears(5) -TextExtension @('2.5.29.37={text}1.3.6.1.5.5.7.3.3')
$cert | Export-PfxCertificate -Password $Password -FilePath $Path
$cert | Remove-Item

#------------------------------------------------
$cert = Get-PfxCertificate -FilePath "$env:temp\codeSignCert.pfx"
# a lot can be done with $cert now - check out GM

#------------------------------------------------

# this could be used now to for example, sign your scripts:
# read in the certificate from a pre-existing PFX file
$cert = Get-PfxCertificate -FilePath "$env:temp\codeSignCert.pfx"

# find all scripts in your user profile...
Get-ChildItem -Path $home -Filter *.ps1 -Include *.ps1 -Recurse -ErrorAction SilentlyContinue |
# ...that do not have a signature yet...
Where-Object {
  ($_ | Get-AuthenticodeSignature).Status -eq 'NotSigned'
  } |
# and apply one
# (note that we added -WhatIf so no signing occurs. Remove this only if you
# really want to add digital signatures!)
Set-AuthenticodeSignature -Certificate $cert -WhatIf

# find all scripts in your user profile...
Get-ChildItem -Path $home -Filter *.ps1 -Include *.ps1 -Recurse -ErrorAction SilentlyContinue |
# ...and check signature status
Get-AuthenticodeSignature