Any advice on creating a JSON object of a user's information?

[BatCave]

This is an area that I am not terribly familiar with, but in order to integrate vBulletin with another system, I first need to create a JSON object of a user's information.

guid, email, display_name, locale, profile url, avatar_url, etc.

Then we need to encrypt the JSON object with AES.

Can anybody point me in the right direction on accomplishing this task?

Barring that as a reasonably doable option, is there a variable guide I can use to look up what variables I should use to pass through a user's email, display_name, locale, profile url, avatar_url, etc. in a custom link?