Invalid PDF digital signature in WinRT app
问题 I am trying to port a working solution for signing PDFs from a standard C# class library to portable class library (or windows store app 8.1). iTextSharp version: 5.5.3.0 The logic is as follows: I create a signature appearance in iTextSharp, hash it (SHA256, it's a third party requirement), send the hash to a webservice which returns me the signed content. As mentioned, the solution is working fine e.g. in ASP.net web applications, but all the attempts to implement it in the WinRT