翻譯|行業(yè)資訊|編輯:胡濤|2023-12-25 11:19:57.710|閱讀 111 次
概述:在本文中,您將了解如何使用不可見(jiàn)或可見(jiàn)簽名對(duì) PDF 進(jìn)行數(shù)字簽名,以及如何使用Spire.PDF for .NET從 PDF 中刪除數(shù)字簽名。
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隨著 PDF 文檔在商業(yè)中越來(lái)越流行,確保其真實(shí)性已成為一個(gè)關(guān)鍵問(wèn)題。使用基于證書(shū)的簽名對(duì) PDF 進(jìn)行簽名可以保護(hù)內(nèi)容,還可以讓其他人知道誰(shuí)簽署或批準(zhǔn)了該文檔。在本文中,您將了解如何使用不可見(jiàn)或可見(jiàn)簽名對(duì) PDF 進(jìn)行數(shù)字簽名,以及如何使用Spire.PDF for .NET從 PDF 中刪除數(shù)字簽名。
Spire.PDF for .NET 是一款獨(dú)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(lèi)庫(kù),開(kāi)發(fā)人員可以新建一個(gè) PDF 文檔或者對(duì)現(xiàn)有的 PDF 文檔進(jìn)行處理,且無(wú)需安裝 Adobe Acrobat。
E-iceblue 功能類(lèi)庫(kù)Spire 系列文檔處理組件均由中國(guó)本土團(tuán)隊(duì)研發(fā),不依賴(lài)第三方軟件,不受其他國(guó)家的技術(shù)或法律法規(guī)限制,同時(shí)適配國(guó)產(chǎn)操作系統(tǒng)如中科方德、中標(biāo)麒麟等,兼容國(guó)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
首先,您需要將 Spire.PDF for .NET 包中包含的 DLL 文件添加為 .NET 項(xiàng)目中的引用。DLL 文件可以從此鏈接下載或通過(guò)NuGet安裝。
PM> Install-Package Spire.PDF
以下是使用 Spire.PDF for .NET 將不可見(jiàn)數(shù)字簽名添加到 PDF 的步驟。
【C?!?nbsp;
using Spire.Pdf;
using Spire.Pdf.Security;
namespace AddInvisibleSignature
{
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 
PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
//Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
//Save to another PDF file 
doc.SaveToFile("InvisibleSignature.pdf");
doc.Close();
}
}
} 
【VB.NET】
	Imports Spire.Pdf
Imports Spire.Pdf.Security
Namespace AddInvisibleSignature
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 
Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature") 
'Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
'Save to another PDF file 
doc.SaveToFile("InvisibleSignature.pdf")
doc.Close()
End Sub
End Class
End Namespace
	 
 
以下是使用 Spire.PDF for .NET 將可見(jiàn)數(shù)字簽名添加到 PDF 的步驟。
【C?!?/strong>
	using System;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Security;
using Spire.Pdf.Graphics;
	namespace AddVisibleSignature
{
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 - 260 - 54 , 200, 260, 110);
signature.Bounds = rectangleF;
signature.Certificated = true;
	//Set the graphics mode to ImageAndSignDetail
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\\handwrittingSignature.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("VisiableSignature.pdf");
doc.Close();
}
}
}
【VB.NET】
	Imports System
Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Security
Imports Spire.Pdf.Graphics
Namespace AddVisibleSignature
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 - 260 - 54,200,260,110) 
signature.Bounds = rectangleF
signature.Certificated = True
'Set the graphics mode to ImageAndSignDetail
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\\handwrittingSignature.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("VisiableSignature.pdf")
doc.Close()
End Sub
End Class
End Namespace
	 
 
以上便是如何將加密或解密 PDF 文件,如果您有其他問(wèn)題也可以繼續(xù)瀏覽本系列文章,獲取相關(guān)教程,你還可以給我留言或者加入我們的官方技術(shù)交流群。
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