Enable LTV for an existing signature C++

Product:PDFTron SDK

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I signed a PDF document and now i want to enable LTV this existing signature in C++

Please describe your issue and provide steps to reproduce it:
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I dont know how to enable ltv for an existing signature

Please provide a link to a minimal sample where the issue is reproducible:

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#include <openssl/applink.c>

#include “OpenSSLSignatureHandler.h”

void SignPDF(const UString& in_docpath,
const UString& in_approval_field_name,
const UString& in_private_key_file_path,
const UString& in_keyfile_password,
const UString& in_appearance_img_path,
const UString& in_outpath)


During the certification of a document, you are still using a digital signature to guarantee the integrity of the document.
However, you are also adding additional restriction on the document preventing further action on it.

The certification of a document being a reliable option, no futher action is possible once this has been applied:
		:the modification will then need to be done on the original « non-sign/certified » document.

The option to certify is only available to the first signer of the document.


cout << "================================================================================" << endl;
cout << "Signing PDF document" << endl;

// Open an existing PDF
PDFDoc doc(in_docpath);

// Retrieve the unsigned approval signature field.
Field found_approval_field(doc.GetField(in_approval_field_name));
PDF::DigitalSignatureField found_approval_signature_digsig_field(found_approval_field);

// Add an appearance to the signature field.
PDF::Image img = PDF::Image::Create(doc, in_appearance_img_path);
Annots::SignatureWidget found_approval_signature_widget(found_approval_field.GetSDFObj());

// Prepare the signature and signature handler for signing.
OpenSSLSignatureHandler sigHandler(in_private_key_file_path.ConvertToUtf8().c_str(), in_keyfile_password.ConvertToUtf8().c_str());
SignatureHandlerId sigHandlerId = doc.AddSignatureHandler(sigHandler);

/* Add to the digital signature dictionary a SubFilter name that uniquely identifies the signature format for verification tools.
As an example, the custom handler defined in this file uses the CMS/PKCS #7 detached format, so we embed one of the standard predefined SubFilter values: "adbe.pkcs7.detached".
It is not necessary to do this when using the StdSignatureHandler. */
Obj f_obj = found_approval_signature_digsig_field.GetSDFObj();
f_obj.FindObj("V").PutName("SubFilter", "adbe.pkcs7.detached");

// The actual approval signing will be done during the following incremental save operation.
doc.Save(in_outpath, SDFDoc::e_incremental, NULL);

cout << "================================================================================" << endl;


void addDTSandEnableLTV(const UString& in_docpath,const UString& in_approval_field_name,const UString& tsa_cer_path,const UString& in_outpath) {

PDFDoc doc(in_docpath);

Field found_approval_field(doc.GetField(in_approval_field_name));
PDF::DigitalSignatureField found_approval_signature_digsig_field(found_approval_field);

TimestampingConfiguration tst_config("https://freetsa.org/tsr");
VerificationOptions opts(VerificationOptions::e_compatibility_and_archiving);
opts.AddTrustedCertificate("./Certificate V2/cacert.pem");

puts("Testing timestamping configuration.");

const TimestampingResult config_result(found_approval_signature_digsig_field.GenerateContentsWithEmbeddedTimestamp(tst_config, opts));

if (config_result.GetStatus()){
	puts("Success: timestamping configuration usable. Attempting to timestamp.");
	// Print details of timestamping failure.
	if (config_result.HasResponseVerificationResult()){
		EmbeddedTimestampVerificationResult tst_result(config_result.GetResponseVerificationResult());
		printf("CMS digest status: %s\n", tst_result.GetCMSDigestStatusAsString().ConvertToUtf8().c_str());
		printf("Message digest status: %s\n", tst_result.GetMessageImprintDigestStatusAsString().ConvertToUtf8().c_str());
		printf("Trust status: %s\n", tst_result.GetTrustStatusAsString().ConvertToUtf8().c_str());


int main(int * argc ,char * argv[])

PDFDoc doc("testClear.pdf");
DigitalSignatureField approval_signature_field = doc.CreateDigitalSignatureField("PDFTronApprovalSig");

Annots::SignatureWidget widgetAnnotApproval = Annots::SignatureWidget::Create(doc, Rect(300, 287, 376, 306), approval_signature_field);
Page page1 = doc.GetPage(1);
doc.Save("waiver_withApprovalField_output.pdf", SDFDoc::e_remove_unused, 0);

SignPDF("waiver_withApprovalField_output.pdf", "PDFTronApprovalSig", "./Certificate V2/GemBoxRSA4096.pfx", "GemBoxPassword", "signature.jpg", "signed.pdf");



Please note that the Digital Signature sample includes code on how to enable LTV and timestamping.

Are you experiencing any issues with the example that is provided? If so, please provide us with further details (expected output vs actual output) including any errors you are running into.

Thank you.

My signature looks like this

I want my signatures looks like this