POP3 Verify Signed (S/MIME) Email

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

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

// Needs #include <CkMailMan.h>
// Needs #include <CkStringArray.h>
// Needs #include <CkEmail.h>
// Needs #include <CkCert.h>

    CkString strOut;

    CkMailMan mailman;

    //  Any string argument automatically begins the 30-day trial.
    bool success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        strOut.append(mailman.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Set the POP3 server's hostname
    mailman.put_MailHost("mail.chilkatsoft.com");

    //  Set the POP3 login/password.
    mailman.put_PopUsername("myLogin");
    mailman.put_PopPassword("myPassword");

    CkStringArray *sa = 0;

    sa = mailman.GetUidls();
    if (sa == 0 ) {
        strOut.append(mailman.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    long i;
    long n;
    n = sa->get_Count();

    CkEmail *email = 0;
    const char * uidl;

    for (i = 0; i <= n - 1; i++) {

        uidl = sa->getString(i);

        email = mailman.FetchEmail(uidl);
        if (email == 0 ) {
            strOut.append(mailman.lastErrorText());
            strOut.append("\r\n");
            break;
        }

        strOut.append(email->ck_from());
        strOut.append("\r\n");
        strOut.append(email->subject());
        strOut.append("\r\n");

        //  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->get_ReceivedSigned() == true) {

            strOut.append("This email was signed.");
            strOut.append("\r\n");

            //  Check to see if the signatures were verified.
            if (email->get_SignaturesValid() == true) {
                strOut.append("Digital signature(s) verified.");
                strOut.append("\r\n");

                strOut.append("Signer: ");
                strOut.append(email->signedBy());
                strOut.append("\r\n");

                //  The certificate used for signing may be obtained
                //  by calling email.GetSignedByCert.
                CkCert *cert = 0;
                cert = email->GetSignedByCert();
                if (cert == 0 ) {
                    strOut.append("Failed to get signing certificate object.");
                    strOut.append("\r\n");
                }
                else {
                    strOut.append("Signing cert: ");
                    strOut.append(cert->subjectCN());
                    strOut.append("\r\n");
                    delete cert;
                }

            }
            else {
                strOut.append("Digital signature verification failed.");
                strOut.append("\r\n");
            }

        }

        delete email;
    }

    delete sa;

    mailman.Pop3EndSession();

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());