Unicode C

IMAP Download and Verify Signed MIME

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Downloads the original MIME of a digitally signed email and saves the .p7s signature along with other MIME parts. It then imports the email into a Chilkat email object to unwrap the S/MIME and verify the signature, and subsequently saves the attachments if they haven't been saved already. Unicode C

#include <C_CkImapW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkMimeW.h>
#include <C_CkStringTableW.h>
#include <C_CkEmailW.h>
#include <C_CkCertW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkImapW imap;
    HCkStringBuilderW sbMime;
    HCkMimeW mime;
    BOOL alreadySavedParts;
    HCkStringTableW st;
    int numFiles;
    int i;
    HCkEmailW email;
    HCkCertW cert;

    success = FALSE;

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

    imap = CkImapW_Create();

    // Connect to an IMAP server.
    // Use TLS
    CkImapW_putSsl(imap,TRUE);
    CkImapW_putPort(imap,993);
    success = CkImapW_Connect(imap,L"imap.example.com");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    success = CkImapW_Login(imap,L"myLogin",L"myPassword");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Select an IMAP mailbox
    success = CkImapW_SelectMailbox(imap,L"Inbox");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Download the 1st email (as MIME) in the Inbox by sequence number.
    sbMime = CkStringBuilderW_Create();
    success = CkImapW_FetchSingleAsMimeSb(imap,1,FALSE,sbMime);
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        CkStringBuilderW_Dispose(sbMime);
        return;
    }

    // Load it into a MIME object and check to see if it is signed
    mime = CkMimeW_Create();
    CkMimeW_LoadMimeSb(mime,sbMime);
    alreadySavedParts = FALSE;
    if (CkMimeW_ContainsSignedParts(mime) == TRUE) {

        // This will save the .p7s and other parts...
        st = CkStringTableW_Create();
        success = CkMimeW_PartsToFiles(mime,L"c:/temp/qa_output",st);
        if (success == TRUE) {
            numFiles = CkStringTableW_getCount(st);
            i = 0;
            while (i < numFiles) {
                wprintf(L"Created: %s\n",CkStringTableW_stringAt(st,i));
                i = i + 1;
            }

            alreadySavedParts = TRUE;
        }

    }

    // Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
    email = CkEmailW_Create();
    CkEmailW_SetFromMimeSb(email,sbMime);

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

        }

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

    if (alreadySavedParts != TRUE) {
        CkEmailW_SaveAllAttachments(email,L"c:/temp/qa_output");
    }



    CkImapW_Dispose(imap);
    CkStringBuilderW_Dispose(sbMime);
    CkMimeW_Dispose(mime);
    CkStringTableW_Dispose(st);
    CkEmailW_Dispose(email);
    CkCertW_Dispose(cert);

    }