(C) Send Signed Email using PFX File (long version)

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file.

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

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    HCkEmail email;
    BOOL success;
    HCkCertStore certStore;
    HCkCert cert;
    HCkCert cert2;

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

    // The mailman object is used for sending and receiving email.
    mailman = CkMailMan_Create();

    // Set the SMTP server.
    CkMailMan_putSmtpHost(mailman,"smtp.mymailserver.com");

    // Create a new email object
    email = CkEmail_Create();

    CkEmail_putSubject(email,"This email is signed");
    CkEmail_putBody(email,"This is a digitally signed mail");
    CkEmail_putFrom(email,"Chilkat Admin <admin@chilkatsoft.com>");
    success = CkEmail_AddTo(email,"Chilkat Support","support@chilkatsoft.com");

    // Indicate that the email should be sent signed.
    CkEmail_putSendSigned(email,TRUE);

    // Load a PFX file into a certificate store object.
    // Then locate the certificate matching the  sender's email address,
    // and use it for signing.
    // (a PFX file may contain more than one certificate.)
    certStore = CkCertStore_Create();
    // The 1st argument is the path of the PFX file, the 2nd arg is the 
    // PFX file's password:
    success = CkCertStore_LoadPfxFile(certStore,"/pfx_files/chilkatsoft_secret.pfx","secret");
    if (success != TRUE) {
        printf("%s\n",CkCertStore_lastErrorText(certStore));
        CkMailMan_Dispose(mailman);
        CkEmail_Dispose(email);
        CkCertStore_Dispose(certStore);
        return;
    }

    cert = CkCertStore_FindCertBySubjectE(certStore,"admin@chilkatsoft.com");
    if (CkCertStore_getLastMethodSuccess(certStore) == FALSE) {
        printf("%s\n",CkCertStore_lastErrorText(certStore));
        CkMailMan_Dispose(mailman);
        CkEmail_Dispose(email);
        CkCertStore_Dispose(certStore);
        return;
    }

    // Alternatively, if a PFX file is known to contain a single certificate,
    // you may load it directly into a Chilkat certificate object.
    // This snippet of source code shows how:
    cert2 = CkCert_Create();
    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    success = CkCert_LoadPfxFile(cert2,"/pfx_files/chilkatsoft_secret.pfx","secret");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert2));
        CkCert_Dispose(cert);
        CkMailMan_Dispose(mailman);
        CkEmail_Dispose(email);
        CkCertStore_Dispose(certStore);
        CkCert_Dispose(cert2);
        return;
    }

    // This example will use the cert from the certStore...
    success = CkEmail_SetSigningCert(email,cert);

    // Signed email can be sent in two different ways.  
    // In a multipart/signed email, the signature is attached as a separate MIME part.
    // In an opaque email (signedData) the content of the email is encapsulated within the signature
    // and the email is sent as "application/pkcs7-mime". 
    // Either should be fine, but some receiving systems might require one or the other..
    CkMailMan_putOpaqueSigning(mailman,FALSE);

    // Send a signed email.
    success = CkMailMan_SendEmail(mailman,email);
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
    }
    else {
        // The LastErrorText property provides information
        // even when successful.
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        printf("Mail Sent!\n");
    }

    CkCert_Dispose(cert);


    CkMailMan_Dispose(mailman);
    CkEmail_Dispose(email);
    CkCertStore_Dispose(certStore);
    CkCert_Dispose(cert2);

    }