PowerShell script to export certificates from Window's Certificate Store (to WSL)

Export-Certificates.ps1

# Prompt user for a pattern
$pattern = Read-Host "Enter the regular expression to search for in the certificate subject"

# Get the certificates matching the pattern.
$certificates = Get-ChildItem -Recurse Cert:\LocalMachine\ `
  | Where-Object PSIsContainer -eq     $false              `
  | Where-Object Subject       -cmatch $pattern

# Check if any certificates match the pattern.
if ($certificates.Count -eq 0) {
    Write-Host "No certificates matched the pattern."
    exit
}

# Display the matched certificates.
Write-Host "Matched certificates:"
$certificates                                               `
  | Select-Object                                           `
      -Property 'Subject','Issuer','NotBefore','NotAfter',* `
      -ExcludeProperty 'PS*','RawData*'                     `
  | Out-GridView

# Ask for confirmation before exporting.
$confirm = Read-Host "Do you want to export these certificates? (y/n)"
if ($confirm -ne 'y') {
    Write-Host "Export cancelled."
    exit
}

# Export the certificates.
$ErrorActionPreference = "Stop"
$certificates | ForEach-Object {
    $subject    = $_.Subject
    $thumbprint = $_.Thumbprint 
    $name       = "$subject - $thumbprint.pem"

    $binaryFileName = "$name.der"
    $base64FileName = "$name.pem"

    Export-Certificate -Cert $_ -Type CERT -FilePath $binaryFileName
    certutil.exe -encode $binaryFileName $base64FileName
}

Write-Host "Export finished."