(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 <C_CkCertW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkDkimW.h>

void ChilkatSample(void)
    {
    HCkCertW cert;
    BOOL success;
    HCkPrivateKeyW privKey;
    HCkDkimW dkim;

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

    cert = CkCertW_Create();

    // 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.
    success = CkCertW_LoadByCommonName(cert,L"My Certificate ABC");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCertW_Dispose(cert);
        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 (!CkCertW_HasPrivateKey(cert)) {
        wprintf(L"This certificate does not have a private key available.\n");
        CkCertW_Dispose(cert);
        return;
    }

    privKey = CkCertW_ExportPrivateKey(cert);
    if (CkCertW_getLastMethodSuccess(cert) == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCertW_Dispose(cert);
        return;
    }

    dkim = CkDkimW_Create();

    // Load the private key into the DKIM object:
    success = CkDkimW_LoadDkimPk(dkim,CkPrivateKeyW_getPkcs8Pem(privKey),L"");
    if (success != TRUE) {
        wprintf(L"%s\n",CkDkimW_lastErrorText(dkim));
        CkCertW_Dispose(cert);
        CkDkimW_Dispose(dkim);
        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...

    CkPrivateKeyW_Dispose(privKey);


    CkCertW_Dispose(cert);
    CkDkimW_Dispose(dkim);

    }