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

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

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#include <C_CkMailMan.h>
#include <C_CkStringArray.h>
#include <C_CkEmail.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    BOOL success;
    HCkStringArray sa;
    HCkEmail email;
    const char *uidl;
    int i;
    HCkCert cert;

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

    mailman = CkMailMan_Create();

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

    // Set the POP3 login/password.
    CkMailMan_putPopUsername(mailman,"myLogin");
    CkMailMan_putPopPassword(mailman,"myPassword");

    sa = CkMailMan_GetUidls(mailman);
    if (CkMailMan_getLastMethodSuccess(mailman) == FALSE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkMailMan_Dispose(mailman);
        return;
    }

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

        uidl = CkStringArray_getString(sa,i);

        email = CkMailMan_FetchEmail(mailman,uidl);
        if (CkMailMan_getLastMethodSuccess(mailman) == FALSE) {
            printf("%s\n",CkMailMan_lastErrorText(mailman));
            CkStringArray_Dispose(sa);
            CkMailMan_Dispose(mailman);
            return;
        }

        printf("%s\n",CkEmail_ck_from(email));
        printf("%s\n",CkEmail_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 (CkEmail_getReceivedSigned(email) == TRUE) {

            printf("This email was signed.\n");

            // Check to see if the signatures were verified.
            if (CkEmail_getSignaturesValid(email) == TRUE) {
                printf("Digital signature(s) verified.\n");
                printf("Signer: %s\n",CkEmail_signedBy(email));

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

                cert = CkEmail_GetSignedByCert(email);
                if (CkEmail_getLastMethodSuccess(email) == FALSE) {
                    printf("Failed to get signing certificate object.\n");
                }
                else {
                    printf("Signing cert: %s\n",CkCert_subjectCN(cert));
                    CkCert_Dispose(cert);
                }

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

        }

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

    CkStringArray_Dispose(sa);

    CkMailMan_Pop3EndSession(mailman);


    CkMailMan_Dispose(mailman);

    }