Read S/MIME Encrypted Email

Read S/MIME encrypted email.

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#include <CkImap.h>
#include <CkEmailBundle.h>
#include <CkEmail.h>

void ChilkatSample(void)
    {
    CkImap imap;

    bool success;

    //  Anything unlocks the component and begins a fully-functional 30-day trial.
    success = imap.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        printf("%s\n",imap.lastErrorText());
        return;
    }

    //  Connect to an IMAP server.
    success = imap.Connect("mail.chilkatsoft.com");
    if (success != true) {
        printf("%s\n",imap.lastErrorText());
        return;
    }

    //  Login
    success = imap.Login("myLogin","myPassword");
    if (success != true) {
        printf("%s\n",imap.lastErrorText());
        return;
    }

    //  Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        printf("%s\n",imap.lastErrorText());
        return;
    }

    //  The AutoUnwrapSecurity method controls whether signed/encrypted emails are automatically
    //  decrypted and/or verified.

    //  When set to true, which is the default, 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).

    //  This example will explicity set AutoUnwrapSecurity to true, even though it's
    //  already the default value:
    imap.put_AutoUnwrapSecurity(true);

    //  The NumMessages property contains the number of messages in the selected mailbox.
    long numToFetch;
    numToFetch = imap.get_NumMessages();
    //  Download all the email in the Inbox.
    CkEmailBundle *bundle = 0;
    bundle = imap.FetchSequence(1,numToFetch);
    if (bundle == 0 ) {
        printf("%s\n",imap.lastErrorText());
        return;
    }

    //  Loop over the bundle,
    long i;
    for (i = 0; i <= bundle->get_MessageCount() - 1; i++) {
        CkEmail *email = 0;
        email = bundle->GetEmail(i);

        printf("%s\n",email->ck_from());
        printf("%s\n",email->subject());

        //  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 (email->get_ReceivedEncrypted() == true) {

            printf("This email was encrypted when received.\n");
            if (email->get_Decrypted() == true) {
                printf("This email was successfully decrypted.  It was encrypted by:\n");
                printf("%s\n",email->encryptedBy());
            }
            else {
                printf("This email was not decrypted.\n");
            }

        }

        if (email->get_ReceivedSigned() == true) {

            printf("This email was signed when received.\n");
            if (email->get_SignaturesValid() == true) {
                printf("The signature was verified.  It was signed by:\n");
                printf("%s\n",email->signedBy());
            }
            else {
                printf("The signature verification failed.\n");
            }

        }

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

        printf("--\n");
        delete email;
    }

    //  Disconnect from the IMAP server.
    imap.Disconnect();

    delete bundle;
    }