如何将时间戳添加到文档（ITextSharp，BouncyCastle）

Question

您好，我想使用 ItextSharp 将授权服务器的时间戳添加到 Pdf，但我不知道如何操作。我只能在带有数字签名的 PDF 中添加时间戳，但我想在没有数字签名的情况下添加。

当我从服务器获取 TimeStamp 时，它里面有证书，但它没有要签名的主密钥，是否有其他方法可以在没有证书的情况下进行签名，或者我需要它，如果是，如何获得用它签署 PDF 的主键。

通过 Bouncy Castle 库获取时间戳令牌

private static TimeStampToken Timestamp(string InputPath, string annexFileName, stringsignedFileName,string UserTs, string PassTs, string UrlTs)
    {

      FileStream stream = File.OpenRead(InputPath);

        SHA1Managed sha = new SHA1Managed();
        byte[] hashedFile = sha.ComputeHash(stream);
        TimeStampRequestGenerator reqGen = new TimeStampRequestGenerator();
        reqGen.SetCertReq(true);

        TimeStampRequest request = reqGen.Generate(
            TspAlgorithms.Sha1, hashedFile, BigInteger.ValueOf(100));
      stream.Close();


      byte[] reqData = request.GetEncoded();
      ServicePointManager.Expect100Continue = true;
      ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3 |
                                             SecurityProtocolType.Tls | SecurityProtocolType.Tls11;

      HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(UrlTs);
      httpReq.Method = "POST";
      httpReq.ContentType = "application/timestamp-query";
      httpReq.ContentLength = reqData.Length;
      httpReq.Credentials = new NetworkCredential(UserTs, PassTs);


      // Write the request content
      Stream reqStream = httpReq.GetRequestStream();
      reqStream.Write(reqData, 0, reqData.Length);
      reqStream.Close();

      HttpWebResponse httpResp = (HttpWebResponse)httpReq.GetResponse();

      // Read the response
      Stream respStream = new BufferedStream(httpResp.GetResponseStream());
      TimeStampResponse response = new TimeStampResponse(respStream);

      respStream.Close();
      response.Validate(request);
      TimeStampToken tsToken = response.TimeStampToken;

      Org.BouncyCastle.X509.Store.IX509Store x509Certs = tsToken.GetCertificates("Collection");
      ArrayList certs = new ArrayList(x509Certs.GetMatches(null));
      tsToken.Validate((Org.BouncyCastle.X509.X509Certificate)certs[0]);

      return tsToken;


    }

Answer 1

谢谢大家的回答。我已经尝试了很多方法来弄清楚，但没有成功。现在我正在使用 Syncfusion FileFormats Library，它工作得很好......遗憾的是它不是免费的，但它可以提供很多关于文件的功能和它的安全性......

//Creates a new PDF document

PdfDocument document = new PdfDocument();

//Adds a new page

PdfPage page = document.Pages.Add();

//Creates a digital signature

PdfSignature signature = new PdfSignature(page, "Signature");

//Add the time stamp by using the server URI

signature.TimeStampServer = new TimeStampServer(new Uri("http://syncfusion.digistamp.com"), "user", "123456");

//Save and close the document

document.Save("Output.pdf");

document.Close(true);

这是如何通过 Syncfusion 将时间戳添加到 Pdf 的示例。

如何将时间戳添加到文档（ITextSharp，BouncyCastle）

How to add TimesStamp to document (ITextSharp, BouncyCastle)

c#

pdf

timestamp

bouncycastle

itext