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(.NET Core C#) IMAP Download and Verify Signed MIMEDownloads the unmodified MIME of a digitally signed email, saves the .p7s signature (and other MIME parts), then loads the email into a Chilkat email object (which unwraps the S/MIME and verifies the signature) and then saves attachments (if the MIME parts were not already saved).
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Imap imap = new Chilkat.Imap(); // Connect to an IMAP server. // Use TLS imap.Ssl = true; imap.Port = 993; bool success = imap.Connect("imap.someMailServer.com"); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } success = imap.Login("myLogin","myPassword"); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Select an IMAP mailbox success = imap.SelectMailbox("Inbox"); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Download the 1st email (as MIME) in the Inbox by sequence number. Chilkat.StringBuilder sbMime = new Chilkat.StringBuilder(); success = imap.FetchSingleAsMimeSb(1,false,sbMime); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Load it into a MIME object and check to see if it is signed Chilkat.Mime mime = new Chilkat.Mime(); mime.LoadMimeSb(sbMime); bool alreadySavedParts = false; if (mime.ContainsSignedParts() == true) { // This will save the .p7s and other parts... Chilkat.StringArray sa = mime.ExtractPartsToFiles("qa_output"); if (mime.LastMethodSuccess == true) { int numFiles = sa.Count; int i = 0; while (i < numFiles) { Debug.WriteLine("Created: " + sa.GetString(i)); i = i + 1; } alreadySavedParts = true; } } // Load the MIME into an Email object. This unwraps the security layers and verifies signatures. Chilkat.Email email = new Chilkat.Email(); email.SetFromMimeSb(sbMime); if (email.ReceivedSigned == true) { Debug.WriteLine("This email was signed."); // Check to see if the signatures were verified. if (email.SignaturesValid == true) { Debug.WriteLine("Digital signature(s) verified."); Debug.WriteLine("Signer: " + email.SignedBy); // The certificate used for signing may be obtained // by calling email.GetSignedByCert. Chilkat.Cert cert = email.GetSignedByCert(); if (email.LastMethodSuccess != true) { Debug.WriteLine("Failed to get signing certificate object."); } else { Debug.WriteLine("Signing cert: " + cert.SubjectCN); } } } else { Debug.WriteLine("Digital signature verification failed."); } if (alreadySavedParts != true) { email.SaveAllAttachments("qa_output"); } |
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