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(C#) IMAP Download and Verify Signed (S/MIME) EmailDemonstrates how to download and verify digitally signed S/MIME email. Note: This example requires Chilkat v11.0.0 or greater.
bool success = false; // 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; success = imap.Connect("imap.example.com"); if (success == false) { Debug.WriteLine(imap.LastErrorText); return; } success = imap.Login("myLogin","myPassword"); if (success == false) { Debug.WriteLine(imap.LastErrorText); return; } // Select an IMAP mailbox success = imap.SelectMailbox("Inbox"); if (success == false) { Debug.WriteLine(imap.LastErrorText); return; } // We can choose to fetch UIDs or sequence numbers. bool fetchUids = true; // Get the message IDs of all the emails in the mailbox Chilkat.MessageSet messageSet = new Chilkat.MessageSet(); success = imap.QueryMbx("ALL",fetchUids,messageSet); if (success == false) { Debug.WriteLine(imap.LastErrorText); return; } Chilkat.Email email = new Chilkat.Email(); Chilkat.Cert cert = new Chilkat.Cert(); int i = 0; while (i < messageSet.Count) { string uid = messageSet.GetId(i); Debug.WriteLine("uid: " + uid); success = imap.FetchEmail(false,uid,true,email); if (success == false) { Debug.WriteLine(imap.LastErrorText); return; } // The security layers of signed and/or encrypted emails // are automatically "unwrapped" when loaded into // a Chilkat email object. // An application only needs to check to see if an email // was received signed or encrypted, and then examine // the success/failure. For example: 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); // Get the certificate used for signing. success = email.LastSignerCert(0,cert); if (success == false) { Debug.WriteLine("Failed to get signing certificate object."); } else { Debug.WriteLine("Signing cert: " + cert.SubjectCN); } } else { Debug.WriteLine("Digital signature verification failed."); } } i = i + 1; } // Disconnect from the IMAP server. success = imap.Disconnect(); |
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