C#實(shí)現(xiàn)PDF簽名時(shí)添加時(shí)間戳的2種方法(附VB.NET代碼)

更新時(shí)間：2021年05月28日 09:20:35 作者：E-iceblue

在PDF添加簽名時(shí)，支持添加可信時(shí)間戳來保證文檔的法律效應(yīng)。本文，將通過C#程序代碼介紹如何添加可信時(shí)間戳，可通過2種方法來實(shí)現(xiàn)。感興趣的可以了解一下

在PDF添加簽名時(shí)，支持添加可信時(shí)間戳來保證文檔的法律效應(yīng)。本文，將通過C#程序代碼介紹如何添加可信時(shí)間戳，可通過2種方法來實(shí)現(xiàn)。文中附上VB.NET代碼，有需可供參考。

一、程序運(yùn)行環(huán)境

編譯環(huán)境：Visual Studio/.NetFramework 4.8
所需測試文件：PDF、.pfx數(shù)字證書及秘鑰、PDF類庫（spire.pdf.dll 7.5.7）
可信時(shí)間戳服務(wù)器：URL地址

注：VS程序中，在“解決方案資源管理器中”先引用spire.pdf.dll文件，如下圖，

這里可以通過Nuget下載該文件。或者在手動(dòng)下載引用，dll文件在下載后的文件包BIN文件夾下，如本次測試使用的是.NET4.0下面的dll，即spire.pdf_7.5.7\BIN\NET4.0\Spire.Pdf.dll，如圖：

二、程序代碼

添加簽名時(shí)，這里可分別通過兩個(gè)類來實(shí)現(xiàn)，即PdfSignature 和 PdfOrdinarySignatureMaker類。下面分別以兩個(gè)代碼示例展示如何簽名并添加時(shí)間戳。

1. 通過PdfSignature類來簽名，添加時(shí)間戳

C#

using Spire.Pdf;
using Spire.Pdf.Security;
using System.Drawing;

namespace TimeStamp
{
    class Program
    {
        static void Main(string[] args)
        {
            //加載PDF文檔
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("sample.pdf");

            //獲取第2頁
            PdfPageBase page = pdf.Pages[1];

            //加載數(shù)字證書（.pfx文件及秘鑰）
            PdfCertificate cert = new PdfCertificate("test.pfx", "123456");

            //加載簽名圖片
            Spire.Pdf.Graphics.PdfImage image = Spire.Pdf.Graphics.PdfImage.FromFile("sign.png");

            //添加與圖片大小相同的簽名到第2頁指定坐標(biāo)位置
            PdfSignature signature = new PdfSignature(page.Document, page, cert, "sign1");//添加數(shù)字簽名
            signature.Bounds = new RectangleF(new PointF(400,700), new SizeF(image.Width, image.Height));//設(shè)置簽名的頁面坐標(biāo)位置、大小與圖片相同
            signature.SignImageSource = image;
            signature.GraphicsMode = Spire.Pdf.Security.GraphicMode.SignImageAndSignDetail;//設(shè)置簽名為圖片模式
            signature.SignImageLayout = Spire.Pdf.Security.SignImageLayout.Stretch;
            signature.DocumentPermissions = Spire.Pdf.Security.PdfCertificationFlags.AllowFormFill | Spire.Pdf.Security.PdfCertificationFlags.AllowComments;//文檔權(quán)限           

            //配置時(shí)間戳服務(wù)器，添加時(shí)間戳
            string url = "Your TimeStamp Server URL";
            signature.ConfigureTimestamp(url);
            //signature.ConfigureTimestamp(url, "Author", "123654");//添加時(shí)間戳?xí)r設(shè)置用戶名和密碼
            

            //保存文檔
            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())
            '加載PDF文檔
            Dim pdf As New PdfDocument()
            pdf.LoadFromFile("sample.pdf")

            '獲取第2頁
            Dim page As PdfPageBase = pdf.Pages(1)

            '加載數(shù)字證書（.pfx文件及秘鑰）
            Dim cert As New PdfCertificate("test.pfx", "123456")

            '加載簽名圖片
            Dim image As Spire.Pdf.Graphics.PdfImage = Spire.Pdf.Graphics.PdfImage.FromFile("sign.png")

            '添加與圖片大小相同的簽名到第2頁指定坐標(biāo)位置
            Dim signature As New PdfSignature(page.Document, page, cert, "sign1")

            '添加數(shù)字簽名
            signature.Bounds = New RectangleF(New PointF(400, 700), New SizeF(image.Width, image.Height))

            '設(shè)置簽名的頁面坐標(biāo)位置、大小與圖片相同
            signature.SignImageSource = image
            signature.GraphicsMode = Spire.Pdf.Security.GraphicMode.SignImageAndSignDetail

            '設(shè)置簽名為圖片模式
            signature.SignImageLayout = Spire.Pdf.Security.SignImageLayout.Stretch
            signature.DocumentPermissions = Spire.Pdf.Security.PdfCertificationFlags.AllowFormFill Or Spire.Pdf.Security.PdfCertificationFlags.AllowComments'文檔權(quán)限           

            '配置時(shí)間戳服務(wù)器，添加時(shí)間戳
            Dim url As String = "Your TimeStamp Server URL"
            signature.ConfigureTimestamp(url)
            'signature.ConfigureTimestamp(url, "Author", "123654");//添加時(shí)間戳?xí)r設(shè)置用戶名和密碼

            '保存文檔
            pdf.SaveToFile("TimeStamp1.pdf", FileFormat.PDF)
            System.Diagnostics.Process.Start("TimeStamp1.pdf")
        End Sub
    End Class
End Namespace

簽名時(shí)間戳添加結(jié)果：

2. 通過PdfOrdinarySignatureMaker類來簽名，添加時(shí)間戳

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)
        {
            //加載PDF文檔
            PdfDocument doc = new PdfDocument();
            doc.LoadFromFile("sample.pdf");

            //加載pfx數(shù)字證書及秘鑰
            X509Certificate2 x509 = new X509Certificate2("test.pfx", "123456");

            //實(shí)例化PdfPKCS7Formatter類的對象
            PdfPKCS7Formatter formatter = new PdfPKCS7Formatter(x509, false);
            formatter.TimestampService = new TSAHttpService("Your TimeStamp Server URL");//配置時(shí)間戳服務(wù)器

            //添加簽名
            PdfOrdinarySignatureMaker signatureMaker = new PdfOrdinarySignatureMaker(doc, formatter);            
            IPdfSignatureAppearance signatureAppearance = new PdfCustomSignatureAppearance();
            signatureMaker.MakeSignature("sign", doc.Pages[1], 400, 650, 150, 80, signatureAppearance);
            
            //保存簽名后的PDF文檔
            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())
            '加載PDF文檔
            Dim doc As New PdfDocument()
            doc.LoadFromFile("sample.pdf")

            '加載pfx數(shù)字證書及秘鑰
            Dim x509 As New X509Certificate2("test.pfx", "123456")

            '實(shí)例化PdfPKCS7Formatter類的對象
            Dim formatter As New PdfPKCS7Formatter(x509, False)
            formatter.TimestampService = New TSAHttpService("Your TimeStamp Server URL")
            '配置時(shí)間戳服務(wù)器
            
'添加簽名
            Dim signatureMaker As New PdfOrdinarySignatureMaker(doc, formatter)
            Dim signatureAppearance As IPdfSignatureAppearance = New PdfCustomSignatureAppearance()
            signatureMaker.MakeSignature("sign", doc.Pages(1), 400, 650, 150, 80, _
                signatureAppearance)

            '保存簽名后的PDF文檔
            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

簽名時(shí)間戳添加結(jié)果：

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