How to let user to tweet in their Own account from my Hololens App?



I would like to post screenshot from Hololens to twitter. I have tried it with Twitter API and with help of [!/content/536] and C#: Upload Photo To Twitter From Unity. It’s working perfectly. I can upload photo in my Account via Unity in my App with using OAuth.

But as I mentioned before I would like it for my Hololens App, I have to build it but when i am trying to build it gives me an Encryption Error." error CS0246: The type or namespace name ‘HMACSHA1’ could not be found (are you missing a using directive or an assembly reference?)".

Secondly, I want let users/clients, (who use my Hololens Application) upload the screenshot from Hololens to their own Twitter Account. Right now i have my Secret key and Consumer key in my App so i will get this photos. But i want to give them access to send photos in their account. for example, when they want to share photo from app they click twitter Button(which I have put in my App) and then it should ask for UserID and Password.

should it possible with Twitter API? or I should try any Other way.

I will glad to get Help from you Guyss.