(Unicode C) POP3 Verify Signed (S/MIME) Email

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

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#include <C_CkMailManW.h>
#include <C_CkStringArrayW.h>
#include <C_CkEmailW.h>
#include <C_CkCertW.h>

void ChilkatSample(void)
    {
    HCkMailManW mailman;
    BOOL success;
    HCkStringArrayW sa;
    HCkEmailW email;
    const wchar_t *uidl;
    int i;
    HCkCertW cert;

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

    mailman = CkMailManW_Create();

    // Set the POP3 server's hostname
    CkMailManW_putMailHost(mailman,L"pop.someMailServer.com");

    // Set the POP3 login/password.
    CkMailManW_putPopUsername(mailman,L"myLogin");
    CkMailManW_putPopPassword(mailman,L"myPassword");

    sa = CkMailManW_GetUidls(mailman);
    if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        return;
    }

    i = 0;
    while (i < CkStringArrayW_getCount(sa)) {

        uidl = CkStringArrayW_getString(sa,i);

        email = CkMailManW_FetchEmail(mailman,uidl);
        if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) {
            wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
            CkStringArrayW_Dispose(sa);
            CkMailManW_Dispose(mailman);
            return;
        }

        wprintf(L"%s\n",CkEmailW_ck_from(email));
        wprintf(L"%s\n",CkEmailW_subject(email));

        // 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 (CkEmailW_getReceivedSigned(email) == TRUE) {

            wprintf(L"This email was signed.\n");

            // Check to see if the signatures were verified.
            if (CkEmailW_getSignaturesValid(email) == TRUE) {
                wprintf(L"Digital signature(s) verified.\n");
                wprintf(L"Signer: %s\n",CkEmailW_signedBy(email));

                // The certificate used for signing may be obtained
                // by calling email.GetSignedByCert.

                cert = CkEmailW_GetSignedByCert(email);
                if (CkEmailW_getLastMethodSuccess(email) == FALSE) {
                    wprintf(L"Failed to get signing certificate object.\n");
                }
                else {
                    wprintf(L"Signing cert: %s\n",CkCertW_subjectCN(cert));
                    CkCertW_Dispose(cert);
                }

            }
            else {
                wprintf(L"Digital signature verification failed.\n");
            }

        }

        CkEmailW_Dispose(email);
        i = i + 1;
    }

    CkStringArrayW_Dispose(sa);

    CkMailManW_Pop3EndSession(mailman);


    CkMailManW_Dispose(mailman);

    }