Hello,
I have a problem with a PDFSignature with Itext and I hope you can help me.
When I sign a document with another program, I have in the document a
PdfDictionary of Type /Sig. When I sign the same document with my own
program, I have the problem, that the Signature can't be verified from
Adobe Reader and from my own program. I think, the problem is, that the
PdfDictionary of Type /Sig is not on the signed Document.
Barbara
Here is a Code Snippet of my program:
vis_sign = stmp.SignatureAppearance;
vis_sign.SetCrypto(null, certs, null,
PdfSignatureAppearance.WINCER_SIGNED);
vis_sign.Reason = "fact4web.com PDF Signatur";
vis_sign.Location = "Austria";
vis_sign.SignDate = DateTime.Now;
vis_sign.SetExternalDigest(new byte[48], null, "RSA");
vis_sign.Render =
PdfSignatureAppearance.SignatureRender.NameAndDescription;
vis_sign.Acro6Layers = true;
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKMS,
PdfName.ADBE_PKCS7_DETACHED);
dic.Date = new PdfDate(vis_sign.SignDate);
dic.Name = PdfPKCS7.GetSubjectFields(certs[0]).GetField("CN");
if (vis_sign.Reason != null)
dic.Reason = vis_sign.Reason;
if (vis_sign.Location != null)
dic.Location = vis_sign.Location;
dic.Put(PdfName.M, new PdfDate(cal));
vis_sign.CryptoDictionary = dic;
int csize = 4000;
Hashtable exc = new Hashtable();
exc[PdfName.CONTENTS] = csize * 2 + 2;
vis_sign.PreClose(excl);
content = streamToByteArray(vis_sign.RangeStream);
hash = hashFunct.ComputeHash(content);
byte[] sig = new byte[signature.Length-2];
for (int i = 0; i < hash.Length; i++)
{
Console.Write(hash[i].ToString("X2"));
Console.Write(" ");
}
PdfDictionary dict = new PdfDictionary();
Array.Copy(signature, 0, sig, 0, signature.Length-2);
dict.Put(PdfName.CONTENTS, new
PdfString(sig).SetHexWriting(true));
vis_sign.Close(dict);
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