C# 给PDF签名时添加时间戳的2种方法(附VB.NET代码)
2021/7/18 14:37:40
本文主要是介绍C# 给PDF签名时添加时间戳的2种方法(附VB.NET代码),对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
在PDF添加签名时,支持vb.net教程添加可信时间c#教程戳来保证文档的法python基础教程律效应。本文,将通过C#程序代码java基础教程介绍如何添加可sql教程信时间戳,可通过2种方法来实现。文中附上VB.NET代码,有需可供参考。
一、程序运行环境
- 编译环境:Visual Studio/.NetFramework 4.8
- 所需测试文件:PDF、.pfx数字证书及秘钥、PDF类库(Spire.PDF for .NET )
- 可信时间戳服务器:URL地址
注:VS程序中,在“解决方案资源管理器中”先引用spire.pdf.dll文件,如下图,
这里可以通过Nuget下载该文件。或者在手动下载引用,dll文件在下载后的文件包BIN文件夹下,如本次测试使用的是.NET4.0下面的dll,即spire.pdf_7.5.7\BIN\NET4.0\Spire.Pdf.dll,如图:
二、程序代码
添加签名时,这里可分别通过两个类来实现,即PdfSignature 和 PdfOrdinarySignatureMaker类。下面分别以两个代码示例展示如何签名并添加时间戳。
1. 通过PdfSignature类来签名,添加时间戳
C#
using Spire.Pdf; using Spire.Pdf.Security; using System.Drawing; namespace TimeStamp { class Program { static void Main(string[] args) { //加载PDF文档 PdfDocument pdf = new PdfDocument(); pdf.LoadFromFile("sample.pdf"); //获取第2页 PdfPageBase page = pdf.Pages[1]; //加载数字证书(.pfx文件及秘钥) PdfCertificate cert = new PdfCertificate("test.pfx", "123456"); //加载签名图片 Spire.Pdf.Graphics.PdfImage image = Spire.Pdf.Graphics.PdfImage.FromFile("sign.png"); //添加与图片大小相同的签名到第2页指定坐标位置 PdfSignature signature = new PdfSignature(page.Document, page, cert, "sign1");//添加数字签名 signature.Bounds = new RectangleF(new PointF(400,700), new SizeF(image.Width, image.Height));//设置签名的页面坐标位置、大小与图片相同 signature.SignImageSource = image; signature.GraphicsMode = Spire.Pdf.Security.GraphicMode.SignImageAndSignDetail;//设置签名为图片模式 signature.SignImageLayout = Spire.Pdf.Security.SignImageLayout.Stretch; signature.DocumentPermissions = Spire.Pdf.Security.PdfCertificationFlags.AllowFormFill | Spire.Pdf.Security.PdfCertificationFlags.AllowComments;//文档权限 //配置时间戳服务器,添加时间戳 string url = "Your TimeStamp Server URL"; signature.ConfigureTimestamp(url); //signature.ConfigureTimestamp(url, "Author", "123654");//添加时间戳时设置用户名和密码 //保存文档 pdf.SaveToFile("TimeStamp1.pdf",FileFormat.PDF); System.Diagnostics.Process.Start("TimeStamp1.pdf"); } } }
VB.NET
Imports Spire.Pdf Imports Spire.Pdf.Security Imports System.Drawing Namespace TimeStamp Class Program Private Shared Sub Main(args As String()) '加载PDF文档 Dim pdf As New PdfDocument() pdf.LoadFromFile("sample.pdf") '获取第2页 Dim page As PdfPageBase = pdf.Pages(1) '加载数字证书(.pfx文件及秘钥) Dim cert As New PdfCertificate("test.pfx", "123456") '加载签名图片 Dim image As Spire.Pdf.Graphics.PdfImage = Spire.Pdf.Graphics.PdfImage.FromFile("sign.png") '添加与图片大小相同的签名到第2页指定坐标位置 Dim signature As New PdfSignature(page.Document, page, cert, "sign1") '添加数字签名 signature.Bounds = New RectangleF(New PointF(400, 700), New SizeF(image.Width, image.Height)) '设置签名的页面坐标位置、大小与图片相同 signature.SignImageSource = image signature.GraphicsMode = Spire.Pdf.Security.GraphicMode.SignImageAndSignDetail '设置签名为图片模式 signature.SignImageLayout = Spire.Pdf.Security.SignImageLayout.Stretch signature.DocumentPermissions = Spire.Pdf.Security.PdfCertificationFlags.AllowFormFill Or Spire.Pdf.Security.PdfCertificationFlags.AllowComments'文档权限 '配置时间戳服务器,添加时间戳 Dim url As String = "Your TimeStamp Server URL" signature.ConfigureTimestamp(url) 'signature.ConfigureTimestamp(url, "Author", "123654");//添加时间戳时设置用户名和密码 '保存文档 pdf.SaveToFile("TimeStamp1.pdf", FileFormat.PDF) System.Diagnostics.Process.Start("TimeStamp1.pdf") End Sub End Class End Namespace
签名时间戳添加结果:
2. 通过PdfOrdinarySignatureMaker类来签名,添加时间戳
C#
using Spire.Pdf; using Spire.Pdf.Graphics; using Spire.Pdf.Interactive.DigitalSignatures; using System.Drawing; using System.Security.Cryptography.X509Certificates; namespace TimeStamp2 { class Program { static void Main(string[] args) { //加载PDF文档 PdfDocument doc = new PdfDocument(); doc.LoadFromFile("sample.pdf"); //加载pfx数字证书及秘钥 X509Certificate2 x509 = new X509Certificate2("test.pfx", "123456"); //实例化PdfPKCS7Formatter类的对象 PdfPKCS7Formatter formatter = new PdfPKCS7Formatter(x509, false); formatter.TimestampService = new TSAHttpService("Your TimeStamp Server URL");//配置时间戳服务器 //添加签名 PdfOrdinarySignatureMaker signatureMaker = new PdfOrdinarySignatureMaker(doc, formatter); IPdfSignatureAppearance signatureAppearance = new PdfCustomSignatureAppearance(); signatureMaker.MakeSignature("sign", doc.Pages[1], 400, 650, 150, 80, signatureAppearance); //保存签名后的PDF文档 doc.SaveToFile("TimeStamp2.pdf", FileFormat.PDF); System.Diagnostics.Process.Start("TimeStamp2.pdf"); } public class PdfCustomSignatureAppearance : IPdfSignatureAppearance { public void Generate(PdfCanvas canvas) { PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", 12), true); canvas.DrawString("SIGNED! A CLASS.\n By Tom Smith", font, PdfBrushes.Red, new PointF(0, 0)); } } } }
VB.NET
Imports Spire.Pdf Imports Spire.Pdf.Graphics Imports Spire.Pdf.Interactive.DigitalSignatures Imports System.Drawing Imports System.Security.Cryptography.X509Certificates Namespace TimeStamp2 Class Program Private Shared Sub Main(args As String()) '加载PDF文档 Dim doc As New PdfDocument() doc.LoadFromFile("sample.pdf") '加载pfx数字证书及秘钥 Dim x509 As New X509Certificate2("test.pfx", "123456") '实例化PdfPKCS7Formatter类的对象 Dim formatter As New PdfPKCS7Formatter(x509, False) formatter.TimestampService = New TSAHttpService("Your TimeStamp Server URL") '配置时间戳服务器 '添加签名 Dim signatureMaker As New PdfOrdinarySignatureMaker(doc, formatter) Dim signatureAppearance As IPdfSignatureAppearance = New PdfCustomSignatureAppearance() signatureMaker.MakeSignature("sign", doc.Pages(1), 400, 650, 150, 80, _ signatureAppearance) '保存签名后的PDF文档 doc.SaveToFile("TimeStamp2.pdf", FileFormat.PDF) System.Diagnostics.Process.Start("TimeStamp2.pdf") End Sub Public Class PdfCustomSignatureAppearance Implements IPdfSignatureAppearance Public Sub Generate(canvas As PdfCanvas) Dim font As New PdfTrueTypeFont(New Font("Arial", 12), True) canvas.DrawString("SIGNED! A CLASS." & vbLf & " By Tom Smith", font, PdfBrushes.Red, New PointF(0, 0)) End Sub End Class End Class End Namespace
签名时间戳添加结果:
以上是本文关于如何在C#程序中给PDF签名添加时间戳的方法。
内容原创,如需转载请务必注明出处!
这篇关于C# 给PDF签名时添加时间戳的2种方法(附VB.NET代码)的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!
- 2022-03-01沐雪多租宝商城源码从.NetCore3.1升级到.Net6的步骤
- 2024-11-18微软研究:RAG系统的四个层次提升理解与回答能力
- 2024-11-15C#中怎么从PEM格式的证书中提取公钥?-icode9专业技术文章分享
- 2024-11-14云架构设计——如何用diagrams.net绘制专业的AWS架构图?
- 2024-05-08首个适配Visual Studio平台的国产智能编程助手CodeGeeX正式上线!C#程序员必备效率神器!
- 2024-03-30C#设计模式之十六迭代器模式(Iterator Pattern)【行为型】
- 2024-03-29c# datetime tryparse
- 2024-02-21list find index c#
- 2024-01-24convert toint32 c#
- 2024-01-24Advanced .Net Debugging 1:你必须知道的调试工具