Search for Digital Signatures

Introduction

In the digital age, ensuring the authenticity and integrity of documents is paramount. Digital signatures play a pivotal role in this process, providing a secure way to sign and verify electronic documents. GroupDocs.Signature for .NET offers a comprehensive solution for working with digital signatures in .NET applications. In this tutorial, we’ll delve into the fundamentals of using GroupDocs.Signature for .NET to search for digital signatures within documents.

Prerequisites

Before we begin, make sure you have the following prerequisites:

  1. GroupDocs.Signature for .NET: Ensure that you have installed GroupDocs.Signature for .NET. You can download the library from here.

  2. Development Environment: Set up your development environment with the necessary tools for .NET development.

  3. Sample Document: Prepare a sample document (e.g., “sample_multiple_signatures.docx”) containing digital signatures for testing purposes.

Import Namespaces

First, import the necessary namespaces to access the functionality provided by GroupDocs.Signature for .NET.

using System;
using System.Collections.Generic;
using GroupDocs.Signature;
using GroupDocs.Signature.Domain;
using GroupDocs.Signature.Options;

Now, let’s dive into the process of searching for digital signatures within a document using GroupDocs.Signature for .NET.

Step 1: Initialize Signature Object

string filePath = "sample_multiple_signatures.docx";
using (Signature signature = new Signature(filePath))
{

Step 2: Search for Signatures

	// search for signatures in document
	List<DigitalSignature> signatures = signature.Search<DigitalSignature>(SignatureType.Digital);

Step 3: Display Results

	Console.WriteLine($"\nSource document ['{filePath}'] contains the following signatures.");
	foreach (var digitalSignature in signatures)
	{
		Console.WriteLine($"Digital signature found from {digitalSignature.SignTime} with validation flag {digitalSignature.IsValid}. Certificate SN {digitalSignature.Certificate?.SerialNumber}");
	}
}

Conclusion

GroupDocs.Signature for .NET provides a robust framework for working with digital signatures in .NET applications. By following this tutorial, you’ve learned how to search for digital signatures within documents, enhancing document security and integrity.

FAQ’s

Can I use GroupDocs.Signature for .NET with other document formats besides DOCX?

Yes, GroupDocs.Signature for .NET supports various document formats, including PDF, XLSX, PPTX, and more.

Is there a free trial available for GroupDocs.Signature for .NET?

Yes, you can access a free trial of GroupDocs.Signature for .NET from here.

Where can I find documentation for GroupDocs.Signature for .NET?

You can find detailed documentation for GroupDocs.Signature for .NET here.

How can I get temporary licenses for GroupDocs.Signature for .NET?

Temporary licenses for GroupDocs.Signature for .NET can be obtained here.

Where can I seek support for GroupDocs.Signature for .NET?

For support related to GroupDocs.Signature for .NET, visit the GroupDocs forum.

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