(Unicode C++) RSA Signature with Certificate's Private Key from PFX

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Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature.

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#include <CkCertStoreW.h>
#include <CkCertW.h>
#include <CkPrivateKeyW.h>
#include <CkRsaW.h>

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

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    CkCertStoreW certStore;

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    bool success = certStore.LoadPfxFile(L"chilkat.pfx",L"test");
    if (success != true) {
        wprintf(L"%s\n",certStore.lastErrorText());
        return;
    }

    CkCertW *cert = certStore.FindCertBySubject(L"Chilkat Software, Inc.");
    if (certStore.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",certStore.lastErrorText());
        return;
    }

    CkPrivateKeyW *pkey = cert->ExportPrivateKey();
    if (cert->get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",cert->lastErrorText());
        delete cert;
        return;
    }

    delete cert;

    // Get the private key in XML format:
    const wchar_t *pkeyXml = pkey->getXml();

    CkRsaW rsa;

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKey(pkeyXml);
    if (success != true) {
        wprintf(L"%s\n",rsa.lastErrorText());
        delete pkey;
        return;
    }

    // Encode the signature as a hex string
    rsa.put_EncodingMode(L"hex");

    const wchar_t *strData = L"This is the string to be signed.";

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "sha-256", "md2" and "md5".
    const wchar_t *hexSig = rsa.signStringENC(strData,L"sha-1");

    wprintf(L"%s\n",hexSig);

    delete pkey;

    wprintf(L"Success!\n");
    }