(Unicode C) POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email.

Note: This example requires Chilkat v11.0.0 or greater.

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#include <C_CkMailManW.h>
#include <C_CkEmailBundleW.h>
#include <C_CkEmailW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMailManW mailman;
    HCkEmailBundleW bundle;
    BOOL keepOnServer;
    BOOL headersOnly;
    int numBodyLines;
    HCkEmailW email;
    int i;

    success = FALSE;

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

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    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");

    // If running on Microsoft Windows, the Chilkat mailman
    // will automatically search the registry-based certificate stores
    // for matching certificates and private keys required for
    // decryption.  However, on Linux, MAX OS X, and other
    // operating systems, no such thing exists.  Therefore, you'll 
    // need to specify one or more PFX (.p12 / .pfx) files as
    // sources for locating the certs required for decyrption.
    success = CkMailManW_AddPfxSourceFile(mailman,L"/pfxFiles/certs_and_keys_1.pfx",L"pfxPassword1");
    if (success == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        return;
    }

    success = CkMailManW_AddPfxSourceFile(mailman,L"/pfxFiles/certs_and_keys_2.pfx",L"pfxPassword2");
    if (success == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        return;
    }

    // ...
    // Note: On MS Windows, it is not required to provide PFX sources
    // if the needed certs and private keys are already installed
    // on the system (in the registry-based certificate stores).

    // Copy the all email from the user's POP3 mailbox 
    // into a bundle object.  The email remains on the server.
    bundle = CkEmailBundleW_Create();
    keepOnServer = TRUE;
    headersOnly = FALSE;
    // Irrelevent because we are NOT downloading headers-only
    numBodyLines = 0;
    success = CkMailManW_FetchAll(mailman,keepOnServer,headersOnly,numBodyLines,bundle);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        CkEmailBundleW_Dispose(bundle);
        return;
    }

    // S/MIME security envelopes are automatically "unwrapped" 
    // when a message is retrieved from the server. Signed emails are automatically verified, and 
    // encrypted emails are automatically decrypted, restoring the email to the original state before 
    // signing and/or encrypting. Information about the signing and encrypting certificates can be 
    // retrieved from the Email object (methods: GetSignedByCert, GetEncryptedByCert; 
    // properties: SignedBy, EncryptedBy, SignaturesValid, Decrypted, ReceivedSigned, 
    // ReceivedEncrypted).

    // Loop over the bundle
    email = CkEmailW_Create();
    i = 0;
    while (i < CkEmailBundleW_getMessageCount(bundle)) {

        CkEmailBundleW_EmailAt(bundle,i,email);

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

        // At this point, if the email was signed and/or encrypted, it is already "unwrapped", i.e.
        // the email is already decrypted and in a state as if it were never signed or encrypted.
        // You may check to see if the email was received encrypted or signed, and if so,
        // whether it was successfully unwrapped and who signed or encrypted it:
        if (CkEmailW_getReceivedEncrypted(email) == TRUE) {

            wprintf(L"This email was encrypted when received.\n");
            if (CkEmailW_getDecrypted(email) == TRUE) {
                wprintf(L"This email was successfully decrypted.  It was encrypted by:\n");
                wprintf(L"%s\n",CkEmailW_encryptedBy(email));
            }
            else {
                wprintf(L"This email was not decrypted.\n");
            }

        }

        if (CkEmailW_getReceivedSigned(email) == TRUE) {

            wprintf(L"This email was signed when received.\n");
            if (CkEmailW_getSignaturesValid(email) == TRUE) {
                wprintf(L"The signature was verified.  It was signed by:\n");
                wprintf(L"%s\n",CkEmailW_signedBy(email));
            }
            else {
                wprintf(L"The signature verification failed.\n");
            }

        }

        // The email's body, HTML body, attachments, etc.
        // are decrypted and available just like any non-encrypted email.

        wprintf(L"--\n");

        i = i + 1;
    }



    CkMailManW_Dispose(mailman);
    CkEmailBundleW_Dispose(bundle);
    CkEmailW_Dispose(email);

    }