Plug.Crypto.masked_compare

You're seeing just the function masked_compare, go back to Plug.Crypto module for more information.
Link to this function

masked_compare(left, right, mask)

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Specs

masked_compare(binary(), binary(), binary()) :: boolean()

Compares the two binaries (one being masked) in constant-time to avoid timing attacks.

It is assumed the right token is masked according to the given mask.