Let $f : \mathbb{R} \to \mathbb{R}$ be a function such that
\[f((x - y)^2) = f(x)^2 - 2xf(y) + y^2\]for all real numbers $x$ and $y.$

Let $n$ be the number of possible values of $f(1),$ and let $s$ be the sum of all possible values of $f(1).$  Find $n \times s.$

Let's think step by step and output the final answer within \boxed{}.
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