.NET で Aspose.PDF プラグインを使用して PDF ドキュメントをデジタルでサインする方法

PM> Install-Package Aspose.PDF

using Aspose.Pdf.Plugins;

string inputPath = "document.pdf";
string outputPath = "document_signed.pdf";
string inputPfx = "certificate.pfx";
string inputPfxPassword = "your_cert_password";

// Create and configure sign options
var options = new SignOptions(inputPfx, inputPfxPassword)
{
    Reason = "Document approval",
    Contact = "john.doe@example.com",
    Location = "New York Office",
    PageNumber = 1, // Sign on the first page
    Visible = true, // Show signature appearance
    // Optionally: Rectangle = new Aspose.Pdf.Rectangle(100, 100, 300, 150)
};
options.AddInput(new FileDataSource(inputPath));
options.AddOutput(new FileDataSource(outputPath));

var plugin = new Signature();
plugin.Process(options);

using Aspose.Pdf.Plugins;
using System;

class Program
{
    static void Main()
    {
        try
        {
            string inputPath = "document.pdf";
            string outputPath = "document_signed.pdf";
            string inputPfx = "certificate.pfx";
            string inputPfxPassword = "your_cert_password";

            // Create and configure sign options
            var options = new SignOptions(inputPfx, inputPfxPassword)
            {
                Reason = "Document approval",
                Contact = "john.doe@example.com",
                Location = "New York Office",
                PageNumber = 1,
                Visible = true
                // Rectangle = new Aspose.Pdf.Rectangle(100, 100, 300, 150) // Uncomment to set signature area
            };
            options.AddInput(new FileDataSource(inputPath));
            options.AddOutput(new FileDataSource(outputPath));

            // Sign the document
            var plugin = new Signature();
            plugin.Process(options);

            Console.WriteLine("PDF signed successfully!");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error during signing: {ex.Message}");
        }
    }
}

options.Rectangle = new Aspose.Pdf.Rectangle(100, 100, 300, 200); // x1, y1, x2, y2

using (var pdfStream = File.OpenRead("document.pdf"))
using (var pfxStream = File.OpenRead("certificate.pfx"))
using (var outputStream = File.Create("document_signed.pdf"))
{
    var options = new SignOptions(pfxStream, "your_cert_password");
    // Configure as before...
    options.AddInput(new StreamDataSource(pdfStream));
    options.AddOutput(new StreamDataSource(outputStream));
    var plugin = new Signature();
    plugin.Process(options);
}