Go Requires Chilkat v11.0.0+

IMAP Download and Verify Signed (S/MIME) Email

See more IMAP Examples

Demonstrates how to download and verify digitally signed S/MIME email. Go

    success := false

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    imap := chilkat.NewImap()

    //  Connect to an IMAP server.
    //  Use TLS
    imap.SetSsl(true)
    imap.SetPort(993)
    success = imap.Connect("imap.example.com")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    success = imap.Login("myLogin","myPassword")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    //  Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    //  We can choose to fetch UIDs or sequence numbers.
    fetchUids := true

    //  Get the message IDs of all the emails in the mailbox
    messageSet := chilkat.NewMessageSet()
    success = imap.QueryMbx("ALL",fetchUids,messageSet)
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        messageSet.DisposeMessageSet()
        return
    }

    email := chilkat.NewEmail()
    cert := chilkat.NewCert()

    i := 0
    for i < messageSet.Count() {

        uid := messageSet.GetId(i)
        fmt.Println("uid: ", *uid)

        success = imap.FetchEmail(false,*uid,true,email)
        if success == false {
            fmt.Println(imap.LastErrorText())
            imap.DisposeImap()
            messageSet.DisposeMessageSet()
            email.DisposeEmail()
            cert.DisposeCert()
            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 {

            fmt.Println("This email was signed.")

            //  Check to see if the signatures were verified.
            if email.SignaturesValid() == true {
                fmt.Println("Digital signature(s) verified.")
                fmt.Println("Signer: ", email.SignedBy())

                //  Get the certificate used for signing.
                success = email.LastSignerCert(0,cert)

                if success == false {
                    fmt.Println("Failed to get signing certificate object.")
                } else {
                    fmt.Println("Signing cert: ", cert.SubjectCN())
                }

            } else {
                fmt.Println("Digital signature verification failed.")
            }

        }

        i = i + 1
    }

    //  Disconnect from the IMAP server.
    success = imap.Disconnect()

    imap.DisposeImap()
    messageSet.DisposeMessageSet()
    email.DisposeEmail()
    cert.DisposeCert()