(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_CkCert.h>
#include <C_CkPrivateKey.h>
#include <C_CkDkim.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    HCkPrivateKey privKey;
    HCkDkim dkim;

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

    cert = CkCert_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 = CkCert_LoadByCommonName(cert,"My Certificate ABC");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_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 (!CkCert_HasPrivateKey(cert)) {
        printf("This certificate does not have a private key available.\n");
        CkCert_Dispose(cert);
        return;
    }

    privKey = CkCert_ExportPrivateKey(cert);
    if (CkCert_getLastMethodSuccess(cert) == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    dkim = CkDkim_Create();

    // Load the private key into the DKIM object:
    success = CkDkim_LoadDkimPk(dkim,CkPrivateKey_getPkcs8Pem(privKey),"");
    if (success != TRUE) {
        printf("%s\n",CkDkim_lastErrorText(dkim));
        CkCert_Dispose(cert);
        CkDkim_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...

    CkPrivateKey_Dispose(privKey);


    CkCert_Dispose(cert);
    CkDkim_Dispose(dkim);

    }