How to search for Digital signatures Leave feedback

GroupDocs.Signature offers an ability to find Digital signatures that are applied to document and returns its digital signature certificate.
Please follow these steps to search for Digital signatures within the document:

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

This example shows how to search for Digital signature in the document and analyze digital signature certificate.

using (Signature signature = new Signature("spreadsheet.xlsx"))
{
    // search for signatures in document
    List<DigitalSignature> signatures = signature.Search<DigitalSignature>(SignatureType.Digital);

    Console.WriteLine("\nSource document contains following signatures.");
    foreach (var digitalSignature in signatures)
    {
        Console.WriteLine("Digital signature found from {0} with validation flag {1}. Certificate SN {2}",
        digitalSignature.SignTime, digitalSignature.IsValid, digitalSignature.Certificate?.SerialNumber);
    }
}

To learn more about document eSign features, please refer to the advanced usage section.

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for .NET examples, plugins, and showcase
• GroupDocs.Signature for Java examples, plugins, and showcase
• Document Signature for .NET MVC UI Example
• Document Signature for .NET App WebForms UI Example
• Document Signature for Java App Dropwizard UI Example
• Document Signature for Java Spring UI Example

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.