X.509 Digital Signatures/Encryption workflow/library recommendations?

Question

My particular use case is that I have to access digital certificates stored on the client, and use them to perform tasks of signing, verifying, encryption and decryption on

Answer 1

Our SecureBlackbox library has a distributed cryptography add-on which does what you need. Currently client-side modules do signing but can be extended by the user (we provide complete source code). You will find detailed description of the add-on on our site or in this SO answer.