Sign with .pfx to create .p7s, Verify with .cer

C++ example to sign a file using a .pfx and creating a .p7s file as output. It then uses a .cer file to verify the signature.

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#include <CkCrypt2.h>
#include <CkCertStore.h>
#include <CkCert.h>
#include <CkCSP.h>

void ChilkatSample(void)
    {
    CkCrypt2 crypt;

    //  Any string argument automatically begins the 30-day trial.
    bool success;
    success = crypt.UnlockComponent("30-day trial");
    if (success != true) {
        printf("Crypt component unlock failed\n");
        return;
    }

    CkCertStore certStore;
    success = certStore.LoadPfxFile("chilkat.pfx","myPfxPassword");
    if (success != true) {
        printf("%s\n",certStore.lastErrorText());
        return;
    }

    CkCert *cert = 0;
    cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.");
    if (cert == 0 ) {
        printf("Failed to find certificate\n");
        return;
    }

    //  We can explicitly choose hash/encryption algorithms using a CSP.
    CkCSP csp;
    csp.SetProviderMicrosoftEnhanced();
    csp.SetHashAlgorithm("sha-1");

    //  Tell the crypt component to use this cert and this CSP.
    crypt.SetSigningCert(*cert);
    crypt.SetCSP(csp);

    //  We can sign any type of file, creating a .p7s as output:
    success = crypt.CreateP7S("hamlet.xml","hamlet.p7s");
    if (success == true) {
        printf("Signature created.\n");
    }
    else {
        printf("%s\n",crypt.lastErrorText());
    }

    //  Verify and restore the original file:
    //  Use a cert from a .cer file (which only contains the public key)
    CkCert cert2;
    success = cert2.LoadFromFile("chilkat.cer");
    if (success != true) {
        printf("%s\n",cert2.lastErrorText());
        return;
    }

    crypt.SetVerifyCert(cert2);

    success = crypt.VerifyP7S("hamlet.xml","hamlet.p7s");
    if (success == true) {
        printf("Signature verified.\n");
    }
    else {
        printf("%s\n",crypt.lastErrorText());
    }

    }