(Unicode C++) Sign PDF in the Cloud using AWS CloudHSM

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Demonstrates how to sign a PDF using AWS CloudHSM. The signing of the hash happens on a hardware token in AWS CloudHSM. Everything else involving the updating the PDF to add the signature happens locally within Chilkat.

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

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#include <CkPkcs11W.h>
#include <CkCertW.h>
#include <CkPdfW.h>
#include <CkJsonObjectW.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.

    CkPkcs11W pkcs11;

    // Provide the path to the AWS CloudHSM PKCS11 driver.
    // This example runs on Windows, so we'll provide the CloudHSM DLL.
    // If your code runs on Linux, the CloudHSM driver might be at /opt/cloudhsm/lib/libcloudhsm_pkcs11.so
    pkcs11.put_SharedLibPath(L"C:\\Program Files\\Amazon\\CloudHSM\\lib\\cloudhsm_pkcs11.dll");

    // Your PIN should be a string containing your crypto user's login and password, with a colon char delimiting.
    // See https://docs.aws.amazon.com/cloudhsm/latest/userguide/pkcs11-pin.html
    const wchar_t *pin = L"user:password";
    int userType = 1;

    // Establish a PKCS 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) {
        wprintf(L"%s\n",pkcs11.lastErrorText());
        return;
    }

    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/certs/myCert.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Tell the certificate to link with the PKCS11 session.
    // The cert's private key should be installed on the CloudHSM.
    // If there are multiple private keys on the CloudHSM, then Chilkat will automatically
    // locate and use the private key corresponding to the certificate.
    success = cert.LinkPkcs11(pkcs11);
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        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..

    CkPdfW pdf;

    // Load a PDF to be signed.
    success = pdf.LoadFile(L"qa_data/pdf/hello.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        success = pkcs11.CloseSession();
        return;
    }

    CkJsonObjectW json;

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

    int i = 0;
    json.put_I(i);
    json.UpdateString(L"appearance.text[i]",L"Digitaly signed by: Xyz Widgets, Inc.");
    i = i + 1;
    json.put_I(i);
    json.UpdateString(L"appearance.text[i]",L"current_dt");
    i = i + 1;
    json.put_I(i);
    json.UpdateString(L"appearance.text[i]",L"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,L"qa_output/out.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        success = pkcs11.CloseSession();
        return;
    }

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

    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.Logout();
    if (success == false) {
        wprintf(L"%s\n",pkcs11.lastErrorText());
        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) {
        wprintf(L"%s\n",pkcs11.lastErrorText());
        return;
    }

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