(C++) PKCS11 Sign PDF using Certificate and Private Key on Smart Card / USB Token

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Sample code showing how to use PKCS11 to sign a PDF with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

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#include <CkPkcs11.h>
#include <CkCert.h>
#include <CkPdf.h>
#include <CkJsonObject.h>

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

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    CkPkcs11 pkcs11;

    pkcs11.put_SharedLibPath("C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll");
    const char *pin = "0000";
    int userType = 1;

    // Establish a PKCS11 logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
    bool success = pkcs11.QuickSession(userType,pin);
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        return;
    }

    // Get the certificate (on the smart card) that has a private key.
    // There are other ways to locate a certificate on the HSM.
    // This example assumes there is a single certificate w/ private key.
    CkCert cert;
    success = pkcs11.FindCert("privateKey","",cert);
    if (success == true) {
        std::cout << "Cert with private key: " << cert.subjectCN() << "\r\n";
    }
    else {
        std::cout << "No certificates having a private key were found." << "\r\n";
        success = pkcs11.CloseSession();
        return;
    }

    // --------------------------------------------------------------------------
    // At this point, we have the cert to be used for signing.
    // Our PDF signing code is the same as for a cert obtained from any other source..

    CkPdf pdf;

    // Load a PDF to be signed.
    success = pdf.LoadFile("qa_data/pdf/hello.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        success = pkcs11.CloseSession();
        return;
    }

    CkJsonObject json;

    json.UpdateInt("page",1);
    json.UpdateString("appearance.y","top");
    json.UpdateString("appearance.x","left");
    json.UpdateString("appearance.fontScale","10.0");
    json.UpdateString("signingAlgorithm","pss");
    json.UpdateString("hashAlgorithm","sha256");

    int i = 0;
    json.put_I(i);
    json.UpdateString("appearance.text[i]","Digitaly signed by: Xyz Widgets, Inc.");
    i = i + 1;
    json.put_I(i);
    json.UpdateString("appearance.text[i]","current_dt");
    i = i + 1;
    json.put_I(i);
    json.UpdateString("appearance.text[i]","blah blah blah");

    // The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
    success = pdf.SetSigningCert(cert);

    success = pdf.SignPdf(json,"qa_output/out.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        success = pkcs11.CloseSession();
        return;
    }

    // --------------------------------------------------------------------------

    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.Logout();
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        success = pkcs11.CloseSession();
        return;
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = pkcs11.CloseSession();
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        return;
    }

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