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数字签名确保签名的文档不能被除其作者之外的任何人更改。添加签名是确保文档内容真实性的最常见方法。PDF 文档中的可视数字签名可以显示文本或图像（例如手写签名）。本文从以下三个方面介绍如何使用Spire.PDF for .NET对PDF 进行数字签名。

Spire.PDF for .NET 是一款独立 PDF 控件，用于 .NET 程序中创建、编辑和操作 PDF 文档。使用 Spire.PDF 类库，开发人员可以新建一个 PDF 文档或者对现有的 PDF 文档进行处理，且无需安装 Adobe Acrobat。

E-iceblue 功能类库Spire 系列文档处理组件均由中国本土团队研发，不依赖第三方软件，不受其他国家的技术或法律法规限制，同时适配国产操作系统如中科方德、中标麒麟等，兼容国产文档处理软件 WPS（如 .wps/.et/.dps 等格式

Spire.PDF for.net下载   Spire.PDF for java下载

安装适用于 .NET 的 Spire.PDF

首先，您需要将 Spire.PDF for .NET 包中包含的 DLL 文件添加为 .NET 项目中的引用。DLL 文件可以从此链接下载或通过NuGet安装。

PM> Install-Package Spire.PDF

使用文本对 PDF 进行数字签名

以下是将纯文本签名添加到 PDF 文档的步骤。

• 创建一个PdfDocument对象，并使用PdfDocument.LoadFromFile()方法加载示例 PDF 文件。
• 初始化PdfCertificate对象时加载 .pfx 证书文件。
• 创建一个PdfSignature对象，指定其在文档中的位置和大小。
• 将签名图形模式设置为SignDetail，这将以纯文本形式显示签名详细信息。
• 通过PdfSignature对象下的属性设置签名详细信息，包括姓名、联系信息、原因、日期等。
• 将认证文档的权限设置为ForbidChanges和AllowFormFill。
• 使用PdfDocument.SaveToFile()方法将文档保存到另一个文件。

【C#】

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

namespace AddTextSignature
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();

//Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");

//Load the certificate
PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");

//Create a PdfSignature object and specify its position and size
PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
signature.Bounds = rectangleF;
signature.Certificated = true;

//Set the graphics mode to sign detail
signature.GraphicsMode = GraphicMode.SignDetail;

//Set the signature content
signature.NameLabel = "Signer:";
signature.Name = "Gary";
signature.ContactInfoLabel = "Phone:";
signature.ContactInfo = "0123456";
signature.DateLabel = "Date:";
signature.Date = DateTime.Now;
signature.LocationInfoLabel = "Location:";
signature.LocationInfo = "USA";
signature.ReasonLabel = "Reason:";
signature.Reason = "I am the author";
signature.DistinguishedNameLabel = "DN:";
signature.DistinguishedName = signature.Certificate.IssuerName.Name;

//Set the signature font
signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));

//Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;

//Save to file
doc.SaveToFile("TextSignature.pdf");
doc.Close();
}
}
}

【VB.NET】

Imports Spire.Pdf
Imports Spire.Pdf.Security
Imports System
Imports System.Drawing
Imports Spire.Pdf.Graphics

Namespace AddTextSignature
Class Program
Shared Sub Main(ByVal args() As String)
'Create a PdfDocument object
Dim doc As PdfDocument = New PdfDocument()

'Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")

'Load the certificate
Dim cert As PdfCertificate = New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")

'Create a PdfSignature object and specify its position and size
Dim signature As PdfSignature = New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
Dim rectangleF As RectangleF = New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
signature.Bounds = rectangleF
signature.Certificated = True

'Set the graphics mode to sign detail
signature.GraphicsMode = GraphicMode.SignDetail

'Set the signature content
signature.NameLabel = "Signer:"
signature.Name = "Gary"
signature.ContactInfoLabel = "Phone:"
signature.ContactInfo = "0123456"
signature.DateLabel = "Date:"
signature.Date = DateTime.Now
signature.LocationInfoLabel = "Location:"
signature.LocationInfo = "USA"
signature.ReasonLabel = "Reason:"
signature.Reason = "I am the author"
signature.DistinguishedNameLabel = "DN:"
signature.DistinguishedName = signature.Certificate.IssuerName.Name

'Set the signature font
signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))

'Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill

'Save to file
doc.SaveToFile("TextSignature.pdf")
doc.Close()
End Sub
End Class
End Namespace

使用图像对 PDF 进行数字签名

以下是将图像签名添加到 PDF 文档的步骤。

• 创建一个PdfDocument对象，并使用PdfDocument.LoadFromFile()方法加载示例 PDF 文件。
• 初始化PdfCertificate对象时加载 .pfx 证书文件。
• 创建一个PdfSignature对象，指定其在文档中的位置和大小。
• 将签名图形模式设置为SignImageOnly，这将仅显示签名图像。
• 通过PdfSignature.SignImageSource属性设置签名图像。
• 将认证文档的权限设置为ForbidChanges和AllowFormFill。
• 使用PdfDocument.SaveToFile()方法将文档保存到另一个文件。

【C#】

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

namespace AddImageSignature
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();

//Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");

//Load the certificate
PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");

//Create a PdfSignature object and specify its position and size
PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
signature.Bounds = rectangleF;
signature.Certificated = true;

//Set the graphics mode to image only
signature.GraphicsMode = GraphicMode.SignImageOnly;

//Set the sign image source
signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");

//Set the signature font
signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));

//Set the document permission to forbid changes but allow form fill
 signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;

//Save to file
doc.SaveToFile("ImageSignature.pdf");
doc.Close();
}
}
}

【VB.NET】

Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Security
Imports System.Drawing

Namespace AddImageSignature
Class Program
Shared Sub Main(ByVal args() As String)
'Create a PdfDocument object
Dim doc As PdfDocument = New PdfDocument()

'Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")

'Load the certificate
Dim cert As PdfCertificate = New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")

'Create a PdfSignature object and specify its position and size
Dim signature As PdfSignature = New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
Dim rectangleF As RectangleF = New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
signature.Bounds = rectangleF
signature.Certificated = True

'Set the graphics mode to image only
signature.GraphicsMode = GraphicMode.SignImageOnly

'Set the sign image source
signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")

'Set the signature font
signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))

'Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill

'Save to file
doc.SaveToFile("ImageSignature.pdf")
doc.Close()
End Sub
End Class
End Namespace

使用文本和图像对 PDF 进行数字签名

以下是使用文本和图像对 PDF 文档进行数字签名的步骤。

• 创建一个PdfDocument对象，并使用PdfDocument.LoadFromFile()方法加载示例 PDF 文件。
• 初始化PdfCertificate对象时加载 .pfx 证书文件。
• 创建一个PdfSignature对象，指定其在文档中的位置和大小。
• 将签名图形模式设置为SignImageAndSignDetail，这将同时显示签名图像和详细信息。
• 通过PdfSignature.SignImageSource属性设置签名图像，并通过 PdfSignature 对象下的其他属性设置签名详细信息，包括姓名、联系信息、原因、日期等。
• 将认证文档的权限设置为ForbidChanges和AllowFormFill。
• 使用PdfDocument.SaveToFile()方法将文档保存到另一个文件。

【C#】

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

namespace AddTextAndImageSignature
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument object
PdfDocument doc = new PdfDocument();

//Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");

//Load the certificate
PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");

//Create a PdfSignature object and specify its position and size
PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
signature.Bounds = rectangleF;
signature.Certificated = true;

//Set the graphics mode to image and sign detail
signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;

//Set the signature content
signature.NameLabel = "Signer:";
signature.Name = "Gary";
signature.ContactInfoLabel = "Phone:";
signature.ContactInfo = "0123456";
signature.DateLabel = "Date:";
signature.Date = DateTime.Now;
signature.LocationInfoLabel = "Location:";
signature.LocationInfo = "USA";
signature.ReasonLabel = "Reason:";
signature.Reason = "I am the author";
signature.DistinguishedNameLabel = "DN:";
signature.DistinguishedName = signature.Certificate.IssuerName.Name;

//Set the signature image source
signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");

//Set the signature font
signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));

//Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;

//Save to file
doc.SaveToFile("TextAndImageSignature.pdf");
doc.Close();
}
}
}

【VB.NET】

Imports Spire.Pdf
Imports Spire.Pdf.Security
Imports System
Imports System.Drawing
Imports Spire.Pdf.Graphics

Namespace AddTextAndImageSignature
Class Program
Shared Sub Main(ByVal args() As String)
'Create a PdfDocument object
Dim doc As PdfDocument = New PdfDocument()

'Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")

'Load the certificate
Dim cert As PdfCertificate = New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")

'Create a PdfSignature object and specify its position and size
Dim signature As PdfSignature = New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
Dim rectangleF As RectangleF = New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
signature.Bounds = rectangleF
signature.Certificated = True

'Set the graphics mode to image and sign detail
signature.GraphicsMode = GraphicMode.SignImageAndSignDetail

'Set the signature content
signature.NameLabel = "Signer:"
signature.Name = "Gary"
signature.ContactInfoLabel = "Phone:"
signature.ContactInfo = "0123456"
signature.DateLabel = "Date:"
signature.Date = DateTime.Now
signature.LocationInfoLabel = "Location:"
signature.LocationInfo = "USA"
signature.ReasonLabel = "Reason:"
signature.Reason = "I am the author"
signature.DistinguishedNameLabel = "DN:"
signature.DistinguishedName = signature.Certificate.IssuerName.Name

'Set the signature image source
signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")

'Set the signature font
signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))

'Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill

'Save to file
doc.SaveToFile("TextAndImageSignature.pdf")
doc.Close()
End Sub
End Class
End Namespace

以上便是如何使用文本或/和图像对 PDF 进行数字签名，如果您有其他问题也可以继续浏览本系列文章，获取相关教程，你还可以给我留言或者加入我们的官方技术交流群。

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