Read S/MIME Encrypted Email

Read S/MIME encrypted email.

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#include <C_CkImap.h>
#include <C_CkEmailBundle.h>
#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkImap imap;
    BOOL success;
    long numToFetch;
    HCkEmailBundle bundle;
    long i;
    HCkEmail email;

    imap = CkImap_Create();

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

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

    //  Login
    success = CkImap_Login(imap,"myLogin","myPassword");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  Select an IMAP mailbox
    success = CkImap_SelectMailbox(imap,"Inbox");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        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:
    CkImap_putAutoUnwrapSecurity(imap,TRUE);

    //  The NumMessages property contains the number of messages in the selected mailbox.

    numToFetch = CkImap_getNumMessages(imap);
    //  Download all the email in the Inbox.

    bundle = CkImap_FetchSequence(imap,1,numToFetch);
    if (bundle == 0 ) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  Loop over the bundle,

    for (i = 0; i <= CkEmailBundle_getMessageCount(bundle) - 1; i++) {

        email = CkEmailBundle_GetEmail(bundle,i);

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

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

        }

        if (CkEmail_getReceivedSigned(email) == TRUE) {

            printf("This email was signed when received.\n");
            if (CkEmail_getSignaturesValid(email) == TRUE) {
                printf("The signature was verified.  It was signed by:\n");
                printf("%s\n",CkEmail_signedBy(email));
            }
            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");
        CkEmail_Dispose(email);
    }

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

    CkEmailBundle_Dispose(bundle);

    CkImap_Dispose(imap);

    }