RSA Signature with Certificate's Private Key from PFX

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

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#include <CkCertStore.h>
#include <CkCert.h>
#include <CkPrivateKey.h>
#include <CkString.h>
#include <CkRsa.h>

void ChilkatSample(void)
    {

    bool success;

    //  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.)
    CkCertStore certStore;

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

    CkCert *cert = 0;
    cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
    if (cert == 0 ) {
        printf("%s\n",certStore.lastErrorText());
        return;
    }

    CkPrivateKey *pkey = 0;
    pkey = cert->ExportPrivateKey();
    if (pkey == 0 ) {
        printf("%s\n",cert->lastErrorText());
        return;
    }

    CkString pkeyXml;
    //  Get the private key in XML format:
    pkeyXml = pkey->getXml();
    delete pkey;

    CkRsa rsa;

    //  Any string argument automatically begins the 30-day trial.

    success = rsa.UnlockComponent("30-day trial");
    if (success != true) {
        printf("RSA component unlock failed\n");
        return;
    }

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

    //  This example will sign a string, and receive the signature
    //  in a hex-encoded string.  Therefore, set the encoding mode
    //  to "hex":
    rsa.put_EncodingMode("hex");

    CkString strData;
    strData = "This is the string to be signed.";

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

    printf("%s\n",(const char *)hexSig);

    printf("Success!\n");
    }