static void PAdES_B_B()
{
// If using Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
using (var document = PdfDocument.Load("Reading.pdf"))
{
// Add a visible signature field to the first page of the PDF document.
var signatureField = document.Form.Fields.AddSignature(document.Pages[0], 300, 500, 250, 50);
// Get a digital ID from PKCS#12/PFX file.
var digitalId = new PdfDigitalId("GemBoxECDsa521.pfx", "GemBoxPassword");
// Create a PDF signer that will create PAdES B-B level signature.
var signer = new PdfSigner(digitalId);
// PdfSigner should create CAdES-equivalent signature.
signer.SignatureFormat = PdfSignatureFormat.CAdES;
// Adobe Acrobat Reader currently doesn't download certificate chain
// so we will also embed certificate of intermediate Certificate Authority in the signature.
// (see https://community.adobe.com/t5/acrobat/signature-validation-using-aia-extension-not-enabled-by-default/td-p/10729647)
signer.ValidationInfo = new PdfSignatureValidationInfo(new PdfCertificate[] { new PdfCertificate("GemBoxECDsa.crt") }, null, null);
// Make sure that all properties specified on PdfSigner are according to PAdES B-B level.
signer.SignatureLevel = PdfSignatureLevel.PAdES_B_B;
// Initiate signing of a PDF file with the specified signer.
signatureField.Sign(signer);
// Finish signing of a PDF file.
document.Save("PAdES B-B.pdf");
}
}
static void SimpleSignature()
{
// If using Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
using (var document = PdfDocument.Load("Reading.pdf"))
{
// Add an invisible signature field to the PDF document.
var signatureField = document.Form.Fields.AddSignature();
// Get a digital ID from PKCS#12/PFX file.
var digitalId = new PdfDigitalId("GemBoxRSA1024.pfx", "GemBoxPassword");
// Create a PDF signer that will create the digital signature.
var signer = new PdfSigner(digitalId);
// Adobe Acrobat Reader currently doesn't download certificate chain
// so we will also embed certificate of intermediate Certificate Authority in the signature.
// (see https://community.adobe.com/t5/acrobat/signature-validation-using-aia-extension-not-enabled-by-default/td-p/10729647)
signer.ValidationInfo = new PdfSignatureValidationInfo(new PdfCertificate[] { new PdfCertificate("GemBoxRSA.crt") }, null, null);
// Initiate signing of a PDF file with the specified signer.
signatureField.Sign(signer);
// Finish signing of a PDF file.
document.Save("Digital Signature.pdf");
}
}
static void PAdES_B_LTA()
{
// If using Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
using (var document = PdfDocument.Load("Reading.pdf"))
{
// Add a visible signature field to the first page of the PDF document.
var signatureField = document.Form.Fields.AddSignature(document.Pages[0], 300, 500, 250, 50);
// Get a digital ID from PKCS#12/PFX file.
var digitalId = new PdfDigitalId("GemBoxECDsa521.pfx", "GemBoxPassword");
// Create a PDF signer that will create PAdES B-LTA level signature.
var signer = new PdfSigner(digitalId);
// PdfSigner should create CAdES-equivalent signature.
signer.SignatureFormat = PdfSignatureFormat.CAdES;
// PdfSigner will embed a timestamp created by freeTSA.org Time Stamp Authority in the signature.
signer.Timestamper = new PdfTimestamper("https://freetsa.org/tsr");
// Make sure that all properties specified on PdfSigner are according to PAdES B-LTA level.
signer.SignatureLevel = PdfSignatureLevel.PAdES_B_LTA;
// Initiate signing of a PDF file with the specified signer.
signatureField.Sign(signer);
// Finish signing of a PDF file.
document.Save("PAdES B-LTA.pdf");
// Download validation-related information for the signature and the signature's timestamp and embed it in the PDF file.
// This will make the signature "LTV enabled".
document.SecurityStore.AddValidationInfo(signatureField.Value);
// Add an invisible signature field to the PDF document that will hold the document timestamp.
var timestampField = document.Form.Fields.AddSignature();
// Initiate timestamping of a PDF file with the specified timestamper.
timestampField.Timestamp(signer.Timestamper);
// Save any changes done to the PDF file that were done since the last time Save was called and
// finish timestamping of a PDF file.
document.Save();
}
}
static void VisibleSignature()
{
// If using Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
using (var document = PdfDocument.Load("Reading.pdf"))
{
// Add a visible signature field to the first page of the PDF document.
var signatureField = document.Form.Fields.AddSignature(document.Pages[0], 300, 500, 250, 50);
// Retrieve signature appearance settings to customize it.
var signatureAppearance = signatureField.Appearance;
// Show 'Reason' label and value.
signatureAppearance.Reason = "Legal agreement";
// Show 'Location' label and value.
signatureAppearance.Location = "New York, USA";
// Do not show 'Date' label nor value.
signatureAppearance.DateFormat = string.Empty;
// Get a digital ID from PKCS#12/PFX file.
var digitalId = new PdfDigitalId("GemBoxRSA1024.pfx", "GemBoxPassword");
// Create a PDF signer that will create the digital signature.
var signer = new PdfSigner(digitalId);
// Adobe Acrobat Reader currently doesn't download certificate chain
// so we will also embed certificate of intermediate Certificate Authority in the signature.
// (see https://community.adobe.com/t5/acrobat/signature-validation-using-aia-extension-not-enabled-by-default/td-p/10729647)
signer.ValidationInfo = new PdfSignatureValidationInfo(new PdfCertificate[] { new PdfCertificate("GemBoxRSA.crt") }, null, null);
// Initiate signing of a PDF file with the specified signer.
signatureField.Sign(signer);
// Finish signing of a PDF file.
document.Save("Visible Digital Signature.pdf");
}
}
static void PAdES_B_LTA()
{
// If using Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
var document = DocumentModel.Load("Reading.docx");
// Create visual representation of digital signature.
var signature = new Picture(document, "GemBoxSignature.png");
// Position signature image at the end of the document.
var lastSection = document.Sections[document.Sections.Count - 1];
lastSection.Blocks.Add(new Paragraph(document, signature));
// If using Professional version, put your serial key below.
GemBox.Pdf.ComponentInfo.SetLicense("FREE-LIMITED-KEY");
// Get a digital ID from PKCS#12/PFX file.
var digitalId = new PdfDigitalId("GemBoxECDsa521.pfx", "GemBoxPassword");
// Create a PDF signer that will create PAdES B-LTA level signature.
var signer = new PdfSigner(digitalId);
// PdfSigner should create CAdES-equivalent signature.
signer.SignatureFormat = PdfSignatureFormat.CAdES;
// PdfSigner will embed a timestamp created by freeTSA.org Time Stamp Authority in the signature.
signer.Timestamper = new PdfTimestamper("https://freetsa.org/tsr");
// Make sure that all properties specified on PdfSigner are according to PAdES B-LTA level.
signer.SignatureLevel = PdfSignatureLevel.PAdES_B_LTA;
// Inject PdfSigner from GemBox.Pdf into
// PdfDigitalSignatureSaveOptions from GemBox.Document.
var signatureOptions = PdfDigitalSignatureSaveOptions.FromSigner(
() => signer.SignatureFormat.ToString(),
() => signer.EstimatedSignatureContentsLength,
signer.ComputeSignature);
signatureOptions.Signature = signature;
var options = new PdfSaveOptions()
{
DigitalSignature = signatureOptions
};
document.Save("PAdES B-LTA.pdf", options);
using (var pdfDocument = GemBox.Pdf.PdfDocument.Load("PAdES B-LTA.pdf"))
{
var signatureField = (PdfSignatureField)pdfDocument.Form.Fields[0];
// Download validation-related information for the signature and the signature's timestamp and embed it in the PDF file.
// This will make the signature "LTV enabled".
pdfDocument.SecurityStore.AddValidationInfo(signatureField.Value);
// Add an invisible signature field to the PDF document that will hold the document timestamp.
var timestampField = pdfDocument.Form.Fields.AddSignature();
// Initiate timestamping of a PDF file with the specified timestamper.
timestampField.Timestamp(signer.Timestamper);
// Save any changes done to the PDF file that were done since the last time Save was called and
// finish timestamping of a PDF file.
pdfDocument.Save();
}
}
