(UndefinedFunctionError) function :crypto.hmac/3 is undefined or private in OTP 24

[LostKobrakai]

(UndefinedFunctionError) function :crypto.hmac/3 is undefined or private

In case you are using a pure Elixir implementation without Plug. :crypto.hmac/{3,4} is deprecated and is removed in Erlang/OTP 24. :crypto.mac/4 should be instead, but it is available only since Erlang/OTP 22.1. Both functions yield the same result: iex(6)> :crypto.mac(:hmac, :sha256, "key", "data") == :crypto.hmac(:sha256, "key", "data") true iex(7)> :crypto.mac(:hmac, :sha384, "key", "data") == :crypto.hmac(:sha384, "key", "data") true