Unicode C++

Sign PDF with Timestamp from TSA (Timestamp Server Authority)

See more PDF Signatures Examples

This example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority). Unicode C++

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

void ChilkatSample(void)
    {
    bool success = false;

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

    CkPdfW pdf;

    //  Load a PDF to be signed.
    //  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    success = pdf.LoadFile(L"qa_data/pdf/hello.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    //  Options for signing are specified in JSON.
    CkJsonObjectW json;

    //  In most cases, the signingCertificateV2 and signingTime attributes are required.
    json.UpdateInt(L"signingCertificateV2",1);
    json.UpdateInt(L"signingTime",1);

    //  Tell Chilkat to create an LTV-enabled (long term validation) signature.
    //  See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp".
    json.UpdateBool(L"ltvOcsp",true);

    //  Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14)
    //  in the CMS signature's authentication attributes
    json.UpdateBool(L"timestampToken.enabled",true);

    //  In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
    json.UpdateString(L"timestampToken.tsaUrl",L"http://timestamp.digicert.com");

    //  If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
    json.UpdateString(L"timestampToken.tsaUsername",L"the_tsa_username");
    json.UpdateString(L"timestampToken.tsaPassword",L"the_tsa_password");

    //  When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
    //  This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
    //  has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
    json.UpdateBool(L"timestampToken.requestTsaCert",true);

    //  Define the appearance of the signature.
    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"appearance.text[0]",L"Digitally signed by: cert_cn");
    json.UpdateString(L"appearance.text[1]",L"current_dt");
    json.UpdateString(L"appearance.text[2]",L"This is an LTV-enabled signature with a TSA timestamp.");

    //  Load the signing certificate. (Use your own certificate.)
    CkCertW cert;
    success = cert.LoadPfxFile(L"qa_data/pfx/myPdfSigningCert.pfx",L"pfxPassword");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    //  Tell the pdf object to use the certificate for signing.
    success = pdf.SetSigningCert(cert);
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    success = pdf.SignPdf(json,L"qa_output/hello_ltv_signed_with_timestamp.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    wprintf(L"The PDF has been successfully cryptographically signed with TSA timestamp and long-term validation.\n");

    //  If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled
    //  and contains an embedded timestamp:
    //  (image:https://example-code.com/images/ltv_signature_with_timestamp.jpg/endImage)
    }