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Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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Local $bSuccess = False

;  Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
;  access to its private key) for decrypting a received encrypted email.  Set the cert
;  before loading the encrypted email so it can be decrypted automatically.

$oEmail = ObjCreate("Chilkat.Email")

;  Load a certificate together with its private key from a PFX file.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/certs/decryption.pfx","pfx_password")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

;  Provide the certificate to use for decryption.
$bSuccess = $oEmail.SetDecryptCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  Load the encrypted email; Chilkat decrypts it using the certificate.
$bSuccess = $oEmail.LoadEml("qa_data/eml/encrypted.eml")
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("ReceivedEncrypted = " & $oEmail.ReceivedEncrypted & @CRLF)
ConsoleWrite("Decrypted = " & $oEmail.Decrypted & @CRLF)

;  Note: Paths such as "qa_data/..." are relative local filesystem paths,
;  relative to the current working directory of the running application.