protected void ManipulatePdf(String dest)
{
ElectronicSignatureInfoDTO signatureInfo = new ElectronicSignatureInfoDTO();
signatureInfo.Bottom = 25;
signatureInfo.Left = 25;
signatureInfo.PageNumber = 1;
SignDocumentSignature(dest, signatureInfo);
}
protected void SignDocumentSignature(string filePath, ElectronicSignatureInfoDTO signatureInfo)
{
PdfSigner pdfSigner = new PdfSigner(new PdfReader(SRC), new FileStream(filePath, FileMode.Create),
new StampingProperties());
pdfSigner.SetCertificationLevel(PdfSigner.CERTIFIED_NO_CHANGES_ALLOWED);
// Set the name indicating the field to be signed.
// The field can already be present in the document but shall not be signed
pdfSigner.SetFieldName("signature");
ImageData clientSignatureImage = ImageDataFactory.Create(IMAGE_PATH);
// If you create new signature field (or use SetFieldName(System.String) with
// the name that doesn't exist in the document or don't specify it at all) then
// the signature is invisible by default.
PdfSignatureAppearance signatureAppearance = pdfSigner.GetSignatureAppearance();
signatureAppearance.SetRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);
signatureAppearance.SetReason("");
signatureAppearance.SetLocationCaption("");
signatureAppearance.SetSignatureGraphic(clientSignatureImage);
signatureAppearance.SetPageNumber(signatureInfo.PageNumber);
signatureAppearance.SetPageRect(new Rectangle(signatureInfo.Left, signatureInfo.Bottom,
25, 25));
char[] password = "******".ToCharArray();
IExternalSignature pks = GetPrivateKeySignature(CERT_PATH, password);
X509Certificate[] chain = GetCertificateChain(CERT_PATH, password);
OCSPVerifier ocspVerifier = new OCSPVerifier(null, null);
OcspClientBouncyCastle ocspClient = new OcspClientBouncyCastle(ocspVerifier);
List <ICrlClient> crlClients = new List <ICrlClient>(new[] { new CrlClientOnline() });
// Sign the document using the detached mode, CMS or CAdES equivalent.
// This method closes the underlying pdf document, so the instance
// of PdfSigner cannot be used after this method call
pdfSigner.SignDetached(pks, chain, crlClients, ocspClient, null, 0,
PdfSigner.CryptoStandard.CMS);
}