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

數(shù)字時間戳用時間和日期標(biāo)記 PDF 簽名，作為完整性證明。時間戳表明文檔的內(nèi)容在某個時間點存在且未更改。本文將介紹如何使用 Spire.PDF 通過時間戳服務(wù)器對 PDF 文檔進行數(shù)字簽名。

代碼片段

[C＃]

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

namespace SignPDFwithTimestamp
{
class Program
{
static void Main(string[] args)
{
//create a PdfDocument object and load a PDF file
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"C:\Users\Administrator\Desktop\Example.pdf");

//load the certificate .pfx file
PdfCertificate cert = new PdfCertificate(@"C:\Users\Administrator\Desktop\gary.pfx", "e-iceblue");

//add a signature to the specified position
PdfSignature signature = new PdfSignature(doc, doc.Pages[0], cert, "signature");
signature.Bounds = new RectangleF(new PointF(350, 700), new SizeF(180, 90));

//set the signature content
signature.NameLabel = "Digitally signed by:Gary";
signature.LocationInfoLabel = "Location:";
signature.LocationInfo = "CN";
signature.ReasonLabel = "Reason: ";
signature.Reason = "Ensure authenticity";
signature.ContactInfoLabel = "Contact Number: ";
signature.ContactInfo = "028-81705109";
signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill | PdfCertificationFlags.ForbidChanges;
signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
signature.SignImageSource = PdfImage.FromFile(@"C:\Users\Administrator\Desktop\company-logo.jpg");

//configure a timestamp server
string url = "http://timestamp.wosign.com/rfc3161";
signature.ConfigureTimestamp(url);

//save to file
doc.SaveToFile("output.pdf");
}
}
}

[VB.NET]

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

Namespace SignPDFwithTimestamp
Class Program
Private Shared Sub Main(args As String())
'create a PdfDocument object and load a PDF file
Dim doc As PdfDocument = New PdfDocument()
doc.LoadFromFile("C:\Users\Administrator\Desktop\Example.pdf")

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

'add a signature to the specified position
Dim signature As PdfSignature = New PdfSignature(doc,doc.Pages(0),cert,"signature")
signature.Bounds = New RectangleF(New PointF(350, 700), New SizeF(180, 90))

'set the signature content
signature.NameLabel = "Digitally signed by:Gary"
signature.LocationInfoLabel = "Location:"
signature.LocationInfo = "CN"
signature.ReasonLabel = "Reason: "
signature.Reason = "Ensure authenticity"
signature.ContactInfoLabel = "Contact Number: "
signature.ContactInfo = "028-81705109"
signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill | PdfCertificationFlags.ForbidChanges
signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
signature.SignImageSource = PdfImage.FromFile("C:\Users\Administrator\Desktop\company-logo.jpg")

'configure a timestamp server
Dim url As String = "http://timestamp.wosign.com/rfc3161"
signature.ConfigureTimestamp(url)

'save to file
doc.SaveToFile("output.pdf")
End Sub
End Class
End Namespace

以上便是如何用時間戳服務(wù)器對 PDF 進行數(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，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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