AutoIt

Load .eml and Decrypt (smime.p7m)

Loads an encrypted email from a .eml file and decrypts using certificate w/ private key found in a .p12 (or .pfx) file.

The Content-Type and Content-Disposition email headers of the email to be decrypted look similar to this:

Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data;
	name="smime.p7m"
Content-Disposition: attachment; filename="smime.p7m"

AutoIt

Local $bSuccess = False

$oEmail = ObjCreate("Chilkat.Email")

;  Add a PFX (or .p12) to be used for decryption
$bSuccess = $oEmail.AddPfxSourceFile("myCert.p12","passwordForP12")
If ($bSuccess <> True) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  Loading the .eml automatically decrypts.
$bSuccess = $oEmail.LoadEml("encrypted.eml")
If ($bSuccess <> True) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  The email now exists as it was prior to encryption.
;  Your app may access the email's subject, body, attachments,
;  etc. using the Chilkat Email API...

;  Save the decrypted email:
$bSuccess = $oEmail.SaveEml("decrypted.eml")
If ($bSuccess <> True) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Success." & @CRLF)