How to Verify Digital Signatures in a GIF File

The code example below clearly demonstrates the steps about how to verify digital signatures in an already signed GIF file in Java using GroupDocs.Signature library by adding just a few lines of code.

Create new instance of Signature class and pass source document path as a constructor parameter.
Instantiate the DigitalVerifyOptions object according to your requirements and specify verification options.
Call verify method of Signature class and pass DigitalVerifyOptions to it.

System Requirements

GroupDocs.Signature for Java APIs are supported on all major platforms and operating systems. Before executing the code below, please make sure that you have the following prerequisites installed on your system.

Operating Systems: Microsoft Windows, Linux, MacOS
Development Environments: Visual Studio, Xamarin, MonoDevelop
Frameworks: .NET Framework, .NET Standard, .NET Core, Mono
Download the latest version of GroupDocs.Signature for Java from NuGet

Signature signature = new Signature("sample.pdf");
DigitalVerifyOptions options = new DigitalVerifyOptions(Constants.CertificatePfx);
options.setComments("Test comment");
options.setPassword("1234567890");

// verify document signatures
VerificationResult result = signature.verify(options);
if (result.isValid())
{
    System.out.print("\nDocument was verified successfully!");
}
else
{
    System.out.print("\nDocument failed verification process.");
}

What is GIF File Format

A GIF or Graphical Interchange Format is a type of highly compressed image. Owned by Unisys, GIF uses the LZW compression algorithm that does not degrade the image quality. For each image GIF typically allow up to 8 bits per pixel and up to 256 colours are allowed across the image. In contrast to a JPEG image, which can display up to 16 million colours and fairly touches the limits of the human eye. Back when the internet emerged, GIFs remained the best choice because they required low bandwidth and compatible for the graphics that consume solid areas of colour. An animated GIF combines numerous images or frames into a single file and displays them in a sequence to generate an animated clip or a short video. The colour limitations are up to 256 for each frame and are likely to be the least suitable for reproducing other images and photographs with colour gradient. Learn more about GIF file format

Other Available Options

Multi-format digital signatures validation API for documents and images. Update signatures from some of the popular file formats as stated below.

Verify Digital Signatures in GIF via Java

Java library to verify all popular digital signature types within a GIF file. Easily manipulate gif properties and customize signing options within documents and images.

About GroupDocs.Signature for Java API

How to Verify Digital Signatures in a GIF File

System Requirements

Verify GIF Signature Live Demos

What is GIF File Format

Other Available Options