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Send an Email with a Digital Signature

Demonstrates the Chilkat Email.SendSigned property. Set it to true to have the email sent with a digital signature (the default is false). Signing also requires a certificate with access to its private key. This example loads that certificate (and its private key) from a PFX file with Cert.LoadPfxFile, supplies it via SetSigningCert, and enables signed sending.

Background: Signing is the mirror image of encrypting. To encrypt for a recipient you use their public certificate; to sign you use your own private key, and recipients verify with your public certificate. A signature does not hide the message — a signed email is still readable by anyone — but it proves who sent it and guarantees the content was not tampered with. A PFX (also called PKCS#12, .pfx or .p12) is a password-protected file that bundles a certificate together with its private key, making it a convenient single-file source for signing credentials.

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Local $bSuccess = False

;  Demonstrates the Email.SendSigned property with a full signing setup.  Set SendSigned
;  to true to have the email sent with a digital signature.  Signing requires a certificate
;  with access to its private key, which we load here from a PFX (.pfx / .p12) file.

$oEmail = ObjCreate("Chilkat.Email")
$oEmail.Subject = "Signed email"
$oEmail.Body = "This message will be sent with a digital signature."
$oEmail.From = "alice@example.com"
$oEmail.AddTo("Bob","bob@example.com")

;  Load the signing certificate (including its private key) from a PFX file.
;  The 2nd argument is the PFX password.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/certs/signer.pfx","pfx_password")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

;  Provide the signing certificate.
$bSuccess = $oEmail.SetSigningCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  Request that the email be sent with a digital signature.
$oEmail.SendSigned = True

ConsoleWrite("SendSigned = " & $oEmail.SendSigned & @CRLF)

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