Roasted chickpeas for houmous?
Roasted, salted dry chickpeas are a snack food.  

I would not expect for you to be able to make humus out of them; for one thing, they would have way too much salt, and the texture would be wrong.  It might be possible with a lot of experimentation, but you'd need to go through several failed batches before you got one which worked.  Personally, I'd just go back to the store.