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

See more Signing in the Cloud Examples

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 <C_CkPkcs11W.h>
#include <C_CkCertW.h>
#include <C_CkPdfW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkPkcs11W pkcs11;
    const wchar_t *pin;
    int userType;
    BOOL success;
    HCkCertW cert;
    HCkPdfW pdf;
    HCkJsonObjectW json;
    int i;

    // 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.

    pkcs11 = CkPkcs11W_Create();

    // 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
    CkPkcs11W_putSharedLibPath(pkcs11,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
    pin = L"user:password";
    userType = 1;

    // Establish a PKCS logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
    success = CkPkcs11W_QuickSession(pkcs11,userType,pin);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPkcs11W_lastErrorText(pkcs11));
        CkPkcs11W_Dispose(pkcs11);
        return;
    }

    cert = CkCertW_Create();
    success = CkCertW_LoadFromFile(cert,L"qa_data/certs/myCert.cer");
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        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 = CkCertW_LinkPkcs11(cert,pkcs11);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        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..

    pdf = CkPdfW_Create();

    // Load a PDF to be signed.
    success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/hello.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkPdfW_Dispose(pdf);
        return;
    }

    json = CkJsonObjectW_Create();

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

    i = 0;
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,L"appearance.text[i]",L"Digitaly signed by: Xyz Widgets, Inc.");
    i = i + 1;
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,L"appearance.text[i]",L"current_dt");
    i = i + 1;
    CkJsonObjectW_putI(json,i);
    CkJsonObjectW_UpdateString(json,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 = CkPdfW_SetSigningCert(pdf,cert);

    success = CkPdfW_SignPdf(pdf,json,L"qa_output/out.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        return;
    }

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

    // Revert to an unauthenticated session by calling Logout.
    success = CkPkcs11W_Logout(pkcs11);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPkcs11W_lastErrorText(pkcs11));
        success = CkPkcs11W_CloseSession(pkcs11);
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        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 = CkPkcs11W_CloseSession(pkcs11);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPkcs11W_lastErrorText(pkcs11));
        CkPkcs11W_Dispose(pkcs11);
        CkCertW_Dispose(cert);
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        return;
    }

    wprintf(L"Success.\n");


    CkPkcs11W_Dispose(pkcs11);
    CkCertW_Dispose(cert);
    CkPdfW_Dispose(pdf);
    CkJsonObjectW_Dispose(json);

    }