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V22.1
.NET Framework 4.5.2+

PackageSignatureValidation Class

Contains the validation information.

Namespace: DevExpress.Office.DigitalSignatures

Assembly: DevExpress.Docs.v22.1.dll

Declaration

public class PackageSignatureValidation

Remarks

Check the PackageSignatureValidation.Result and PackageSignatureValidation.ResultMessage properties to determine whether the signature is valid.

Note

Make sure that the signature certificate is registered on your machine. Otherwise, the signature is invalid.

If the document is not signed, the PackageSignatureValidation.Result property returns SignaturesNotFound.

If the document to be validated is encrypted, specify the SignatureValidationOptions.DecryptionPassword property to decrypt the document. Otherwise, the Result property returns PackageSignatureValidationResult.PackageOpenFailed.

If the PackageSignatureValidation.Result property returns Invalid or PartiallyValid, check the PackageSignatureValidation.Items property to obtain a list of items with detailed validation information. The number of SignatureValidationInfo objects in the list is equal to the number of signatures.

The table below lists API used to obtain information:

Property Description
SignatureValidationInfo.PassedChecks Returns verification types the signature passed.
SignatureValidationInfo.PassedCheckDetails Obtains information about passed verifications.
SignatureValidationInfo.FailedChecks Returns verification types the signature did not pass.
SignatureValidationInfo.FailedCheckDetails Retrieves information about failed verifications.
SignatureValidationInfo.CheckDetails Gets information about all verifications.

The code sample below validates signatures in a DOCX and XLSX document, checks the result, and displays information in the console:

using DevExpress.Office.DigitalSignatures;
using System.Diagnostics;
using System.Net;

static void Main(string[] args)
{
    ValidateSignature("Template_signed.docx");
    ValidateSignature("Template_signed.xlsx");
}

private static void ValidateSignature(string path)
{
    DocumentSigner validator = new DocumentSigner();

    //In this example, certificate validation is skipped
    SignatureValidationOptions validationOptions = new SignatureValidationOptions();
    validationOptions.ValidationFlags = ~ValidationFlags.ValidateSignatureCertificate & ~ValidationFlags.ValidateTimestampCertificate;

    //Validate the signature:
    PackageSignatureValidation signatureValidation = validator.Validate(path, validationOptions);
    AnalyzeValidationResult(signatureValidation);        

}

private static void AnalyzeValidationResult(PackageSignatureValidation signatureValidation)
{
    string validationMessage = signatureValidation.ResultMessage;

    //Check validation result and show information in the console:
    switch (signatureValidation.Result)
    {
        case PackageSignatureValidationResult.Valid:
            Console.WriteLine(validationMessage); Console.ReadKey();
            Process.Start(output);
            break;

        case PackageSignatureValidationResult.SignaturesNotFound:
            Console.WriteLine(validationMessage);
            break;

        case PackageSignatureValidationResult.Invalid:
        case PackageSignatureValidationResult.PartiallyValid:
            var failedCheckDetails = signatureValidation.Items[0].FailedCheckDetails;
            Console.WriteLine(validationMessage);
            int i = 1;
            foreach (SignatureCheckResult checkResult in failedCheckDetails)
            {
                Console.WriteLine(String.Format("Validation details {0}: \r\n" +
                    "{1} failed, Info: {2} \r\n", i, checkResult.CheckType, checkResult.Info));
                i++;
            }
            Console.ReadKey();
            break;
    }
}

The following code snippets (auto-collected from DevExpress Examples) contain references to the PackageSignatureValidation class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

Inheritance

Object
PackageSignatureValidation
See Also