數(shù)字簽名確保簽名的文檔不能被除其作者之外的任何人更改。添加簽名是確保文檔內(nèi)容真實性的最常見方法。PDF 文檔中的可視數(shù)字簽名可以顯示文本或圖像（例如手寫簽名）。本文從以下三個方面介紹如何使用Spire.PDF for .NET對PDF 進(jìn)行數(shù)字簽名。
Spire.PDF for .NET?是一款獨立 PDF 控件，用于 .NET 程序中創(chuàng)建、編輯和操作 PDF 文檔。使用 Spire.PDF 類庫，開發(fā)人員可以新建一個 PDF 文檔或者對現(xiàn)有的 PDF 文檔進(jìn)行處理，且無需安裝 Adobe Acrobat。
E-iceblue?功能類庫Spire 系列文檔處理組件均由中國本土團(tuán)隊研發(fā)，不依賴第三方軟件，不受其他國家的技術(shù)或法律法規(guī)限制，同時適配國產(chǎn)操作系統(tǒng)如中科方德、中標(biāo)麒麟等，兼容國產(chǎn)文檔處理軟件 WPS（如 .wps/.et/.dps 等格式
Spire.PDF for.net下載? ?Spire.PDF for java下載
安裝適用于 .NET 的 Spire.PDF
首先，您需要將 Spire.PDF for .NET 包中包含的 DLL 文件添加為 .NET 項目中的引用。DLL 文件可以從此鏈接下載或通過NuGet安裝。
PM> Install-Package Spire.PDF
使用文本對 PDF 進(jìn)行數(shù)字簽名
以下是將純文本簽名添加到 PDF 文檔的步驟。
- 創(chuàng)建一個PdfDocument對象，并使用PdfDocument.LoadFromFile()方法加載示例 PDF 文件。
- 初始化PdfCertificate對象時加載 .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，這將以純文本形式顯示簽名詳細(xì)信息。
- 通過PdfSignature對象下的屬性設(shè)置簽名詳細(xì)信息，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。
【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
使用圖像對 PDF 進(jìn)行數(shù)字簽名
以下是將圖像簽名添加到 PDF 文檔的步驟。
- 創(chuàng)建一個PdfDocument對象，并使用PdfDocument.LoadFromFile()方法加載示例 PDF 文件。
- 初始化PdfCertificate對象時加載 .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，這將僅顯示簽名圖像。
- 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ForbidChanges和AllowFormFill。
- 使用PdfDocument.SaveToFile()方法將文檔保存到另一個文件。
【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
使用文本和圖像對 PDF 進(jìn)行數(shù)字簽名
以下是使用文本和圖像對 PDF 文檔進(jìn)行數(shù)字簽名的步驟。
- 創(chuàng)建一個PdfDocument對象，并使用PdfDocument.LoadFromFile()方法加載示例 PDF 文件。
- 初始化PdfCertificate對象時加載 .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，這將同時顯示簽名圖像和詳細(xì)信息。
- 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)置簽名詳細(xì)信息，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。
【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
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以上便是如何使用文本或/和圖像對 PDF 進(jìn)行數(shù)字簽名，如果您有其他問題也可以繼續(xù)瀏覽本系列文章，獲取相關(guān)教程~文章來源地址http://www.zghlxwxcb.cn/news/detail-819270.html
到了這里，關(guān)于PDF控件Spire.PDF for .NET【安全】演示：使用文本或/和圖像對 PDF 進(jìn)行數(shù)字簽名的文章就介紹完了。如果您還想了解更多內(nèi)容，請在右上角搜索TOY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！
