我使用c#创建和签署pdf,itextsharp.Now我使用这个密码保护和数字标记的代码。首先我用password.Than我签署保护。如何使用iTextSharp来密码保护数字签名的pdf?
传送的pdf在开启时是不是要求密码? 有人可以告诉我为什么会发生这种情况?
谢谢..我使用数字签名
string passprotectedfile = filename;
using (Stream input = new FileStream(signedfile, FileMode.Open, FileAccess.Read,
FileShare.Read))
{
using (Stream output = new FileStream(passprotectedfile, FileMode.Create,
FileAccess.Write, FileShare.None))
{
PdfReader reader = new PdfReader(input);
PdfEncryptor.Encrypt(reader, output, true, regno.ToString(), "",
PdfWriter.ALLOW_SCREENREADERS);
}
}
代码。
PdfReader reader = new PdfReader(filename,pass);
Stream output = new FileStream(signedfile, FileMode.Create, FileAccess.Write, FileShare.None);
PdfStamper stamper = PdfStamper.CreateSignature(reader, output, '\0');
Rectangle rect = new Rectangle(455, 105, 555, 170);
PdfSignatureAppearance appearance = stamper.SignatureAppearance;
appearance.SetVisibleSignature(rect, 1, "sign");
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, new PdfName("adobe.pkcs7.detached"));
PrivateKeySignature pks = new PrivateKeySignature(pk, "SHA-256");
MakeSignature.SignDetached(appearance, pks, chain, null, null, null, 0, true);
return filename;
然后我发送。
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=tes2.pdf");
Response.TransmitFile(signedfile);
Response.Flush();
File.Delete(signedfile);
File.Delete(newfile);
File.Delete(passprotectedfile);
那么你面临的问题是什么? – Raghuveer
传送的pdf是不是要求输入密码才能打开pdf? – Giri