PowerShell

Specify a Certificate for Encrypted Email

Demonstrates the Chilkat Email.AddEncryptCert method, which explicitly specifies a certificate to use when sending encrypted email. Call it once per recipient certificate; ClearEncryptCerts clears the list. This example loads a recipient certificate, registers it, and enables encrypted sending.

Background: When encrypting to multiple people, each recipient needs to be able to decrypt with their own private key. S/MIME handles this by encrypting the message's one-time content key separately under each recipient's public certificate and including all of those wrapped keys in the message. AddEncryptCert is how you build that recipient list — one call per certificate — giving explicit control over exactly whose certificates are used rather than relying on automatic lookup.

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

$success = $false

#  Demonstrates the AddEncryptCert method, which explicitly specifies a certificate for
#  sending encrypted email.  Call it once per recipient certificate.  Use ClearEncryptCerts
#  to clear the list.

$email = New-Object Chilkat.Email
$email.Subject = "Encrypted email"
$email.Body = "Encrypted to the specified recipient certificate(s)."
$email.From = "alice@example.com"
$email.AddTo("Bob","bob@example.com")

#  Load a recipient certificate (public key) and add it to the encryption cert list.
$cert = New-Object Chilkat.Cert
$success = $cert.LoadFromFile("qa_data/certs/recipient.cer")
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

$success = $email.AddEncryptCert($cert)
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

#  Request encrypted sending.
$email.SendEncrypted = $true

$("Added the recipient's encryption certificate.")

#  Note: The path "qa_data/certs/recipient.cer" is a relative local filesystem path,
#  relative to the current working directory of the running application.