![]() The validation of a signature depends on the bytes representing the document. The usage of digital signatures in the PdfViewer comes with the following limitations: ShowSignSignatureDialogCommandContext context = new ShowSignSignatureDialogCommandContext() SignatureField firstSignatureField = .FormFields.FirstOrDefault(field => field.FieldType = FormFieldType.Signature) as SignatureField if (firstSignatureField != null & firstSignatureField.Signature = null) Limitations Register the SignSignatureDialog by using the ExtensibilityManager To use the SignSignatureDialog, first register it through the ExtensibilityManager. The newly saved file then opens in the PdfViewer. Clicking the Sign button prompts you to save the signed document to a new file. pfx file representing the certificate and enter the password for it. You can apply a signature through the SignSignatureDialog when a document with a signature field is loaded in the PdfViewer. To use the signature API of the PdfViewer, users have to add a reference to the NuGet package version 6.0.3 or later. ![]() The exported file can then be imported in RadPdfViewer, so that you can render the resultant document.įor sample code for creating fields and widgets with the RadPdfProcessing library, refer to the CreateInteractiveForms SDK example. With it, you can import the existing PDF, modify its AcroForm FormFieldCollection, create and position widgets for the new fields, and export the result to the PDF FileStream or MemoryStream. The only possible approach to add signature fields and widgets to PDF files which do not have any fields, is to use the RadPdfProcessing library. ![]() This field exposes a property called Signature, which is responsible for the validation. The information about a digital signature in a document is stored in a signature field, which can be obtained through the AcroForm property of the document. The PdfViewer allows you to validate signature fields by using the following standard Cryptography Standards: Once the document is signed, any change on it invalidates the hash, respectively the signature is invalidated. The result of this operation is the digital signature of the document. The algorithm creates a hash ( #) over the document data and uses the signer's private key to encrypt this hash. The private key is used to create the signature while the user signs the document. The digital signatures rely on a mathematical algorithm, which generates a public and a private key. The signature is unique to each signer and is widely used to confirm that the document content originated from the signer and has not been modified in any way. The digital signature is the equivalent of the hand-written signature and is intended to solve security problems in the digital communication. The PdfViewer enables you to display, sign, and verify documents within your application, and make sure that the documents have not been modified. Download free 30-day trial Digital Signature
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