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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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Local $bSuccess = 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.

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

;  Load a recipient certificate (public key) and add it to the encryption cert list.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromFile("qa_data/certs/recipient.cer")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oEmail.AddEncryptCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  Request encrypted sending.
$oEmail.SendEncrypted = True

ConsoleWrite("Added the recipient's encryption certificate." & @CRLF)

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