使用iTextSharp.pdf进行数字签名的demo

使用iTextSharp.pdf进行数字签名的demo，网上资料较少，这是我从 只看远方 这位大牛那里下载的挺好用

 属性            大小     日期    时间   名称
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     文件    2514944  2006-03-03 17:09  iTextSharpSign\bin\Debug\itextsharp.dll

     文件      36864  2017-10-23 21:27  iTextSharpSign\bin\Debug\iTextSharpSign.exe

     文件      44544  2017-10-23 21:27  iTextSharpSign\bin\Debug\iTextSharpSign.pdb

     文件       5632  2005-09-23 06:56  iTextSharpSign\bin\Debug\iTextSharpSign.vshost.exe

     文件       4199  2017-10-23 21:19  iTextSharpSign\Form1.cs

     文件      27308  2017-10-23 21:15  iTextSharpSign\Form1.Designer.cs

     文件       5817  2017-10-23 21:15  iTextSharpSign\Form1.resx

     文件       3505  2006-06-16 16:34  iTextSharpSign\iTextSharpSign.csproj

     文件        842  2017-10-23 21:16  iTextSharpSign\obj\Debug\iTextSharpSign.csproj.GenerateResource.Cache

     文件      36864  2017-10-23 21:27  iTextSharpSign\obj\Debug\iTextSharpSign.exe

     文件        180  2017-10-23 21:16  iTextSharpSign\obj\Debug\iTextSharpSign.Form1.resources

     文件      44544  2017-10-23 21:27  iTextSharpSign\obj\Debug\iTextSharpSign.pdb

     文件        180  2017-10-23 21:16  iTextSharpSign\obj\Debug\iTextSharpSign.Properties.Resources.resources

     文件       4589  2017-10-23 21:16  iTextSharpSign\obj\Debug\ResolveAssemblyReference.cache

     文件        343  2006-06-16 18:03  iTextSharpSign\obj\iTextSharpSign.csproj.FileList.txt

     文件        821  2017-10-23 21:27  iTextSharpSign\obj\iTextSharpSign.csproj.FileListAbsolute.txt

     文件       5881  2017-10-23 21:27  iTextSharpSign\PDFSigner.cs

     文件        484  2006-06-16 15:43  iTextSharpSign\Program.cs

     文件       1258  2006-06-16 16:34  iTextSharpSign\Properties\AssemblyInfo.cs

     文件       2855  2006-06-16 15:43  iTextSharpSign\Properties\Resources.Designer.cs

     文件       5612  2006-06-16 15:43  iTextSharpSign\Properties\Resources.resx

     文件       1097  2006-06-16 15:43  iTextSharpSign\Properties\Settings.Designer.cs

     文件        249  2006-06-16 15:43  iTextSharpSign\Properties\Settings.settings

     文件     157935  2017-10-22 18:11  iTextSharpSign\resource\a1.pdf

     文件      21511  2017-10-22 22:47  iTextSharpSign\resource\Hello.pdf

     文件      97267  2017-10-23 21:22  iTextSharpSign\resource\Hello2.pdf

     文件      68196  2017-09-24 00:12  iTextSharpSign\resource\sign1.png

     文件       2593  2017-10-20 18:14  iTextSharpSign\resource\test.pfx

    ..A..H.       162  2018-05-10 21:21  iTextSharpSign\~$说明.rtf

     目录          0  2017-10-23 21:16  iTextSharpSign\bin\Debug

............此处省略10个文件信息