如何检索数字签名信息（名称，日期，...）与iTextSharp的 [英] How to retrieve digital signature information (name, date, ...) with ItextSharp

问题描述

我已签署的2人（通过EID）的PDF文件。

I have a pdf which has been signed by 2 people (by Eid).

我试图获取此信息，但我无法thusfar。

I'm trying to retrieve this information but I'm unable thusfar.

这是我到目前为止有：

namespace ConsoleApplication1
    {
        class Program
        {
            static void Main(string[] args)
            {
                string workingFolder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
                string inputFile = Path.Combine(workingFolder, "Tax Return.pdf");            

                PdfReader reader = new PdfReader(inputFile);

                Console.ReadLine();
            }
        }
    }

如果我检查读者在运行时我可以看到AcroForm有2场指向签名，但我无法看到这些签名的任何具体信息......

If I inspect 'reader' during runtime I can see that AcroForm has 2 Fields that point to the signatures but I'm unable to see any specific information about these signatures...

在此先感谢！

推荐答案

看看的 最好的例子使用带数字签名 工作时的iText [夏普]。这里有一个简单的例子：

Take a look at the best examples for working with digital signatures when using iText[Sharp]. Here's a short example:

StringBuilder sb = new StringBuilder();
PdfReader reader = new PdfReader(pdf);
AcroFields af = reader.AcroFields;
ArrayList  names = af.GetSignatureNames();
for (int i = 0; i < names.Count; ++i) {
  String name = (string)names[i];
  PdfPKCS7 pk = af.VerifySignature(name);
  sb.AppendFormat("Signature field name: {0}\n", name);
  sb.AppendFormat("Signature signer name: {0}\n", pk.SignName);
  sb.AppendFormat("Signature date: {0}\n", pk.SignDate);
  sb.AppendFormat("Signature country: {0}\n",  
    PdfPKCS7.GetSubjectFields(pk.SigningCertificate).GetField("C")
  );
  sb.AppendFormat("Signature organization: {0}\n",  
    PdfPKCS7.GetSubjectFields(pk.SigningCertificate).GetField("O")
  );
  sb.AppendFormat("Signature unit: {0}\n",  
    PdfPKCS7.GetSubjectFields(pk.SigningCertificate).GetField("OU")
  );
}

这篇关于如何检索数字签名信息（名称，日期，...）与iTextSharp的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！