(C++) Add S/MIME Signature using PFX

Add a digital signature to a MIME message using the certificate + private key from a PFX file.

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#include <CkMime.h>
#include <CkCert.h>

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

    CkMime mime;

    // Load a PFX file into a certificate object.
    CkCert cert;
    const char *pfxFilepath = "pfxFiles/something.pfx";
    const char *pfxPassword = "secret";
    bool success = cert.LoadPfxFile(pfxFilepath,pfxPassword);
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    success = mime.SetBodyFromPlainText("This is the plain-text MIME body.");

    mime.put_Charset("utf-8");
    mime.put_Encoding("quoted-printable");

    // Sign the MIME (adds a PKCS7 detached signature)
    success = mime.AddDetachedSignature(cert);
    if (success == false) {
        std::cout << mime.lastErrorText() << "\r\n";
        return;
    }

    // Save the S/MIME to a file.
    success = mime.SaveMime("/temp/signedMime.txt");
    if (success == false) {
        std::cout << mime.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "success!" << "\r\n";
    }