(C++) Sign a File to Create a .p7s (Detached Signature)

C++ example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

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

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

    CkCrypt2 crypt;

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    const char *signingCertSubject = "Acme Inc";
    const char *pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx";
    const char *pfxPassword = "test123";

    CkCertStore certStore;
    bool success = certStore.LoadPfxFile(pfxFilename,pfxPassword);
    if (success != true) {
        std::cout << certStore.lastErrorText() << "\r\n";
        return;
    }

    CkCert *cert = certStore.FindCertBySubjectCN(signingCertSubject);
    if (certStore.get_LastMethodSuccess() == false) {
        std::cout << "Failed to find certificate by subject common name." << "\r\n";
        return;
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(*cert);

    // We can sign any type of file, creating a .p7s as output:
    const char *inFile = "/Users/chilkat/testData/pdf/sample.pdf";
    const char *sigFile = "/Users/chilkat/testData/p7s/sample.p7s";

    success = crypt.CreateP7S(inFile,sigFile);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        delete cert;
        return;
    }

    success = crypt.VerifyP7S(inFile,sigFile);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        delete cert;
        return;
    }

    delete cert;

    std::cout << "Success!" << "\r\n";
    }