(PowerShell) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$cert = New-Object Chilkat.Cert

# The LoadByCommonName method searches the Windows Local Machine and Current User 
# registry-based certificate stores for a certificate having the common name specified. 
# If found, the certificate is loaded and ready for use.
$success = $cert.LoadByCommonName("My Certificate ABC")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

# The certificate must have an associated private key installed, and it must be a
# private key that has been marked "exportable" when it was originally installed.
if (!$cert.HasPrivateKey()) {
    $("This certificate does not have a private key available.")
    exit
}

$privKey = $cert.ExportPrivateKey()
if ($cert.LastMethodSuccess -eq $false) {
    $($cert.LastErrorText)
    exit
}

$dkim = New-Object Chilkat.Dkim

# Load the private key into the DKIM object:
$success = $dkim.LoadDkimPk($privKey.GetPkcs8Pem(),"")
if ($success -ne $true) {
    $($dkim.LastErrorText)
    exit
}

# The private key has been loaded into the DKIM object.  See the other DKIM
# examples for guidance on how to create a DKIM signature...