(C) POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email.

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

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    BOOL success;
    HCkEmailBundle bundle;
    int i;
    HCkEmail email;

    // 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 = 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");

    // 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 = CkMailMan_AddPfxSourceFile(mailman,"/pfxFiles/certs_and_keys_1.pfx","pfxPassword1");
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkMailMan_Dispose(mailman);
        return;
    }

    success = CkMailMan_AddPfxSourceFile(mailman,"/pfxFiles/certs_and_keys_2.pfx","pfxPassword2");
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkMailMan_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 = CkMailMan_CopyMail(mailman);
    if (CkMailMan_getLastMethodSuccess(mailman) == FALSE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkMailMan_Dispose(mailman);
        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, 
    i = 0;
    while (i < CkEmailBundle_getMessageCount(bundle)) {

        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);

        i = i + 1;
    }

    CkEmailBundle_Dispose(bundle);


    CkMailMan_Dispose(mailman);

    }