(Go) POP3 Verify Signed (S/MIME) Email

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

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

    mailman := chilkat.NewMailMan()
    var success bool

    // Set the POP3 server's hostname
    mailman.SetMailHost("pop.someMailServer.com")

    // Set the POP3 login/password.
    mailman.SetPopUsername("myLogin")
    mailman.SetPopPassword("myPassword")

    sa := mailman.GetUidls()
    if mailman.LastMethodSuccess() == false {
        fmt.Println(mailman.LastErrorText())
        return
    }

    var email  Email
    var uidl *string = new(string)

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

        uidl = sa.GetString(i)

        email = mailman.FetchEmail(*uidl)
        if mailman.LastMethodSuccess() == false {
            fmt.Println(mailman.LastErrorText())
            sa.DisposeStringArray()
            return
        }

        fmt.Println(email.From())
        fmt.Println(email.Subject())

        // 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())

                // The certificate used for signing may be obtained
                // by calling email.GetSignedByCert.
                var cert  Cert
                cert = email.GetSignedByCert()
                if email.LastMethodSuccess() == false {
                    fmt.Println("Failed to get signing certificate object.")
                }
                else {
                    fmt.Println("Signing cert: ", cert.SubjectCN())
                    cert.DisposeCert()
                }

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

        }

        email.DisposeEmail()
        i = i + 1
    }

    sa.DisposeStringArray()

    mailman.Pop3EndSession()