(C) Send Signed Email using PFX File

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>

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    HCkEmail email;
    BOOL success;

    // 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);

    // Tell the mailman to use a PFX file as a source for locating
    // the certificate and private key required for signing.
    // The certificate chosen for signing will be the one that
    // matches the sender's email address, which also has
    // a private key.  All intermediate certs in the chain of 
    // authentication, up to and including the root, will
    // be included in the signature.
    success = CkMailMan_AddPfxSourceFile(mailman,"/pfx_files/chilkatsoft_secret.pfx","secret");
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkMailMan_Dispose(mailman);
        CkEmail_Dispose(email);
        return;
    }

    // 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");
    }



    CkMailMan_Dispose(mailman);
    CkEmail_Dispose(email);

    }