Digital Signature Library Project (MS.NET / C#)

This is likely to be the start of an ongoing project to build a suit of web based applications to create, inspect and retrieve digitally signed PDF files. The first step is to create a c# api that facilitates the digital signing of a pdf file. The class library will also need to be able to inspect and verify any given pdf file to see if it has been digitally signed / tampered with since being signed (by the same library).