使用文本或/和圖像對 PDF 進(jìn)行數(shù)字簽名

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Spire.PDF for .NET 是一款專門對 Word 文檔進(jìn)行操作的 .NET 類庫。致力于在于幫助開發(fā)人員輕松快捷高效地創(chuàng)建、編輯、轉(zhuǎn)換和打印 Microsoft Word 文檔，而無需安裝 Microsoft Word。

行號用于在每行文本旁邊顯示 Word 自動計算的行數(shù)。當(dāng)我們需要參考合同或法律文件等文檔中的特定行時，它非常有用。word中的行號功能允許我們設(shè)置起始值、編號間隔、與文本的距離以及行號的編號方式。使用 Spire.Doc，我們可以實現(xiàn)上述所有功能。本文將介紹如何將 HTML 轉(zhuǎn)換為 PDF。

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數(shù)字簽名可確保已簽名的文件不會被作者以外的任何人篡改。添加簽名是確保文檔內(nèi)容真實性的最常用方法。PDF 文檔中的可視數(shù)字簽名可以顯示文本或圖像（如手寫簽名）。本文將從以下三個方面介紹如何使用 Spire.PDF for .NET 對 PDF 文件進(jìn)行數(shù)字簽名。

• 用文本數(shù)字簽名 PDF
• 用圖像數(shù)字簽名 PDF
• 使用文本和圖像對 PDF 進(jìn)行數(shù)字簽名

安裝 Spire.PDF for .NET

首先，您需要將 Spire.PDF for.NET 軟件包中包含的 DLL 文件作為引用添加到您的 .NET 項目中。這些 DLL 文件既可以從這個鏈接下載，也可以通過 NuGet 安裝。

1  PM> Install-Package Spire.PDF

用文本對 PDF 進(jìn)行數(shù)字簽名

以下是為 PDF 文檔添加純文本簽名的步驟。

• 創(chuàng)建一個PdfDocument對象，并使用PdfDocument.LoadFromFile()方法加載一個PDF樣本文件。
• 在初始化PdfCertificate對象時加載一個.pfx證書文件。
• 創(chuàng)建一個 PdfSignature 對象，指定其在文檔中的位置和大小。
• 將簽名圖形模式設(shè)置為 "SignDetail"，即用純文本顯示簽名細(xì)節(jié)。
• 通過 PdfSignature 對象下的屬性設(shè)置簽名細(xì)節(jié)，包括姓名、聯(lián)系信息、原因、日期等。
• 將認(rèn)證文檔的權(quán)限設(shè)置為 ForbidChanges（禁止更改）和 AllowFormFill（允許填寫表格）。
• 使用PdfDocument.SaveToFile()方法將文檔保存到另一個文件中。

[C#]

01	using Spire.Pdf;
02	using Spire.Pdf.Security;
03	using System;
04	using System.Drawing;
05	using Spire.Pdf.Graphics;
06	 
07	namespace AddTextSignature
08	{
09	    class Program
10	    {
11	        static void Main(string[] args)
12	        {
13	            //Create a PdfDocument object
14	            PdfDocument doc = new PdfDocument();
15	 
16	            //Load a sample PDF file
17	            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
18	 
19	            //Load the certificate
20	            PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
21	 
22	            //Create a PdfSignature object and specify its position and size
23	            PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");    
24	            RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
25	            signature.Bounds = rectangleF;
26	            signature.Certificated = true;
27	 
28	            //Set the graphics mode to sign detail
29	            signature.GraphicsMode = GraphicMode.SignDetail;
30	 
31	            //Set the signature content
32	            signature.NameLabel = "Signer:";
33	            signature.Name = "Gary";
34	            signature.ContactInfoLabel = "Phone:";
35	            signature.ContactInfo = "0123456";
36	            signature.DateLabel = "Date:";
37	            signature.Date = DateTime.Now;
38	            signature.LocationInfoLabel = "Location:";
39	            signature.LocationInfo = "USA";
40	            signature.ReasonLabel = "Reason:";
41	            signature.Reason = "I am the author";
42	            signature.DistinguishedNameLabel = "DN:";
43	            signature.DistinguishedName = signature.Certificate.IssuerName.Name;
44	 
45	            //Set the signature font
46	            signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
47	 
48	            //Set the document permission to forbid changes but allow form fill
49	            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
50	 
51	            //Save to file
52	            doc.SaveToFile("TextSignature.pdf");
53	            doc.Close();
54	        }
55	    }
56	}

[VB.NET]

01	Imports Spire.Pdf
02	Imports Spire.Pdf.Security
03	Imports System
04	Imports System.Drawing
05	Imports Spire.Pdf.Graphics
06	  
07	Namespace AddTextSignature
08	    Class Program
09	        Shared  Sub Main(ByVal args() As String)
10	            'Create a PdfDocument object
11	            Dim doc As PdfDocument =  New PdfDocument()
12	  
13	            'Load a sample PDF file
14	            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
15	  
16	            'Load the certificate
17	            Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
18	  
19	            'Create a PdfSignature object and specify its position and size
20	            Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
21	            Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
22	            signature.Bounds = rectangleF
23	            signature.Certificated = True
24	  
25	            'Set the graphics mode to sign detail
26	            signature.GraphicsMode = GraphicMode.SignDetail
27	  
28	            'Set the signature content
29	            signature.NameLabel = "Signer:"
30	            signature.Name = "Gary"
31	            signature.ContactInfoLabel = "Phone:"
32	            signature.ContactInfo = "0123456"
33	            signature.DateLabel = "Date:"
34	            signature.Date = DateTime.Now
35	            signature.LocationInfoLabel = "Location:"
36	            signature.LocationInfo = "USA"
37	            signature.ReasonLabel = "Reason:"
38	            signature.Reason = "I am the author"
39	            signature.DistinguishedNameLabel = "DN:"
40	            signature.DistinguishedName = signature.Certificate.IssuerName.Name
41	  
42	            'Set the signature font
43	            signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
44	  
45	            'Set the document permission to forbid changes but allow form fill
46	            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
47	  
48	            'Save to file
49	            doc.SaveToFile("TextSignature.pdf")
50	            doc.Close()
51	        End Sub
52	    End Class
53	End Namespace

用圖像對 PDF 進(jìn)行數(shù)字簽名
以下是在 PDF 文檔中添加圖像簽名的步驟。

• 創(chuàng)建一個PdfDocument對象，并使用PdfDocument.LoadFromFile()方法加載一個PDF樣本文件。
• 在初始化PdfCertificate對象時加載一個.pfx證書文件。
• 創(chuàng)建一個 PdfSignature 對象，指定其在文檔中的位置和大小。
• 將簽名圖形模式設(shè)置為SignImageOnly，即只顯示簽名圖像。
• 通過PdfSignature.SignImageSource屬性設(shè)置簽名圖像。
• 將認(rèn)證文檔的權(quán)限設(shè)置為 "禁止更改 "和 "允許填寫表格"。
• 使用PdfDocument.SaveToFile()方法將文檔保存到另一個文件中。

[C#]

01	using Spire.Pdf;
02	using Spire.Pdf.Graphics;
03	using Spire.Pdf.Security;
04	using System.Drawing;
05	 
06	namespace AddImageSignature
07	{
08	    class Program
09	    {
10	        static void Main(string[] args)
11	        {
12	            //Create a PdfDocument object
13	            PdfDocument doc = new PdfDocument();
14	 
15	            //Load a sample PDF file
16	            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
17	 
18	            //Load the certificate
19	            PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
20	 
21	            //Create a PdfSignature object and specify its position and size
22	            PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
23	            RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
24	            signature.Bounds = rectangleF;
25	            signature.Certificated = true;
26	 
27	            //Set the graphics mode to image only
28	            signature.GraphicsMode = GraphicMode.SignImageOnly;
29	 
30	            //Set the sign image source
31	            signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
32	 
33	            //Set the signature font
34	            signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
35	 
36	            //Set the document permission to forbid changes but allow form fill
37	            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
38	 
39	            //Save to file
40	            doc.SaveToFile("ImageSignature.pdf");
41	            doc.Close();
42	        }
43	    }
44	}

[VB.NET]

01	Imports Spire.Pdf
02	Imports Spire.Pdf.Graphics
03	Imports Spire.Pdf.Security
04	Imports System.Drawing
05	  
06	Namespace AddImageSignature
07	    Class Program
08	        Shared  Sub Main(ByVal args() As String)
09	            'Create a PdfDocument object
10	            Dim doc As PdfDocument =  New PdfDocument()
11	  
12	            'Load a sample PDF file
13	            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
14	  
15	            'Load the certificate
16	            Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
17	  
18	            'Create a PdfSignature object and specify its position and size
19	            Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
20	            Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
21	            signature.Bounds = rectangleF
22	            signature.Certificated = True
23	  
24	            'Set the graphics mode to image only
25	            signature.GraphicsMode = GraphicMode.SignImageOnly
26	  
27	            'Set the sign image source
28	            signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
29	  
30	            'Set the signature font
31	            signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
32	  
33	            'Set the document permission to forbid changes but allow form fill
34	            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
35	  
36	            'Save to file
37	            doc.SaveToFile("ImageSignature.pdf")
38	            doc.Close()
39	        End Sub
40	    End Class
41	End Namespace

使用文本和圖像對 PDF 進(jìn)行數(shù)字簽名
以下是對 PDF 文檔進(jìn)行文本和圖像數(shù)字簽名的步驟。

• 創(chuàng)建一個 PdfDocument 對象，并使用 PdfDocument.LoadFromFile() 方法加載一個示例 PDF 文件。
• 在初始化PdfCertificate對象時加載一個.pfx證書文件。
• 創(chuàng)建一個 PdfSignature 對象，指定其在文檔中的位置和大小。
• 將簽名圖形模式設(shè)置為SignImageAndSignDetail，即同時顯示簽名圖像和細(xì)節(jié)。
• 通過PdfSignature.SignImageSource屬性設(shè)置簽名圖像，并通過PdfSignature對象下的其他屬性設(shè)置簽名細(xì)節(jié)，包括姓名、聯(lián)系信息、原因、日期等。
• 將認(rèn)證文檔的權(quán)限設(shè)置為 ForbidChanges 和 AllowFormFill。
• 使用PdfDocument.SaveToFile()方法將文檔保存到另一個文件中。

[C#]

01	using Spire.Pdf;
02	using Spire.Pdf.Security;
03	using System;
04	using System.Drawing;
05	using Spire.Pdf.Graphics;
06	 
07	namespace AddTextAndImageSignature
08	{
09	    class Program
10	    {
11	        static void Main(string[] args)
12	        {
13	            //Create a PdfDocument object
14	            PdfDocument doc = new PdfDocument();
15	 
16	            //Load a sample PDF file
17	            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
18	 
19	            //Load the certificate
20	            PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
21	 
22	            //Create a PdfSignature object and specify its position and size
23	            PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
24	            RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
25	            signature.Bounds = rectangleF;
26	            signature.Certificated = true;
27	 
28	            //Set the graphics mode to image and sign detail
29	            signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
30	 
31	            //Set the signature content
32	            signature.NameLabel = "Signer:";
33	            signature.Name = "Gary";
34	            signature.ContactInfoLabel = "Phone:";
35	            signature.ContactInfo = "0123456";
36	            signature.DateLabel = "Date:";
37	            signature.Date = DateTime.Now;
38	            signature.LocationInfoLabel = "Location:";
39	            signature.LocationInfo = "USA";
40	            signature.ReasonLabel = "Reason:";
41	            signature.Reason = "I am the author";
42	            signature.DistinguishedNameLabel = "DN:";
43	            signature.DistinguishedName = signature.Certificate.IssuerName.Name;
44	 
45	            //Set the signature image source
46	            signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
47	 
48	            //Set the signature font
49	            signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
50	 
51	            //Set the document permission to forbid changes but allow form fill
52	            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
53	 
54	            //Save to file
55	            doc.SaveToFile("TextAndImageSignature.pdf");
56	            doc.Close();
57	        }
58	    }
59	}

[VB.NET]

01	Imports Spire.Pdf
02	Imports Spire.Pdf.Security
03	Imports System
04	Imports System.Drawing
05	Imports Spire.Pdf.Graphics
06	  
07	Namespace AddTextAndImageSignature
08	    Class Program
09	        Shared  Sub Main(ByVal args() As String)
10	            'Create a PdfDocument object
11	            Dim doc As PdfDocument =  New PdfDocument()
12	  
13	            'Load a sample PDF file
14	            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
15	  
16	            'Load the certificate
17	            Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
18	  
19	            'Create a PdfSignature object and specify its position and size
20	            Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
21	            Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
22	            signature.Bounds = rectangleF
23	            signature.Certificated = True
24	  
25	            'Set the graphics mode to image and sign detail
26	            signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
27	  
28	            'Set the signature content
29	            signature.NameLabel = "Signer:"
30	            signature.Name = "Gary"
31	            signature.ContactInfoLabel = "Phone:"
32	            signature.ContactInfo = "0123456"
33	            signature.DateLabel = "Date:"
34	            signature.Date = DateTime.Now
35	            signature.LocationInfoLabel = "Location:"
36	            signature.LocationInfo = "USA"
37	            signature.ReasonLabel = "Reason:"
38	            signature.Reason = "I am the author"
39	            signature.DistinguishedNameLabel = "DN:"
40	            signature.DistinguishedName = signature.Certificate.IssuerName.Name
41	  
42	            'Set the signature image source
43	            signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
44	  
45	            'Set the signature font
46	            signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
47	  
48	            'Set the document permission to forbid changes but allow form fill
49	            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
50	  
51	            'Save to file
52	            doc.SaveToFile("TextAndImageSignature.pdf")
53	            doc.Close()
54	        End Sub
55	    End Class
56	End Namespace

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