(Unicode C++) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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#include <CkCertW.h>
#include <CkPrivateKeyW.h>
#include <CkDkimW.h>

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

    CkCertW cert;

    // The LoadByCommonName method searches the Windows Local Machine and Current User 
    // registry-based certificate stores for a certificate having the common name specified. 
    // If found, the certificate is loaded and ready for use.
    bool success = cert.LoadByCommonName(L"My Certificate ABC");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // The certificate must have an associated private key installed, and it must be a
    // private key that has been marked "exportable" when it was originally installed.
    if (!cert.HasPrivateKey()) {
        wprintf(L"This certificate does not have a private key available.\n");
        return;
    }

    CkPrivateKeyW *privKey = 0;

    privKey = cert.ExportPrivateKey();
    if (cert.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkDkimW dkim;

    // Load the private key into the DKIM object:
    success = dkim.LoadDkimPk(privKey->getPkcs8Pem(),L"");
    if (success != true) {
        wprintf(L"%s\n",dkim.lastErrorText());
        return;
    }

    // The private key has been loaded into the DKIM object.  See the other DKIM
    // examples for guidance on how to create a DKIM signature...

    delete privKey;
    }