ViperCoderJay
(UndefinedFunctionError) function :crypto.hmac/3 is undefined or private
I’m failing to render any page, the application takes giving me the following error
[error] #PID<0.1204.0> running ElixirWeb.Endpoint (connection #PID<0.1203.0>, stream id 1) terminated
Server: localhost:8080 (http)
Request: GET /
** (exit) an exception was raised:
** (UndefinedFunctionError) function :crypto.hmac/3 is undefined or private
(crypto 5.0) :crypto.hmac/3
(plug_crypto 1.2.0) lib/plug/crypto/key_generator.ex:81: Plug.Crypto.KeyGenerator.generate/7
(plug_crypto 1.2.0) lib/plug/crypto/key_generator.ex:67: Plug.Crypto.KeyGenerator.with_cache/3
(plug_crypto 1.2.0) lib/plug/crypto/key_generator.ex:51: Plug.Crypto.KeyGenerator.generate/6
(plug 1.11.0) lib/plug/session/cookie.ex:114: Plug.Session.COOKIE.put/4
(plug 1.11.0) lib/plug/session.ex:94: anonymous fn/3 in Plug.Session.before_send/2
(elixir 1.12.0) lib/enum.ex:2356: Enum."-reduce/3-lists^foldl/2-0-"/3
(plug 1.11.0) lib/plug/conn.ex:1691: Plug.Conn.run_before_send/2
(plug 1.11.0) lib/plug/conn.ex:407: Plug.Conn.send_resp/1
(phoenix 1.5.6) lib/phoenix/endpoint/render_errors.ex:78: Phoenix.Endpoint.RenderErrors.instrument_render_and_send/5
(phoenix 1.5.6) lib/phoenix/endpoint/render_errors.ex:64: Phoenix.Endpoint.RenderErrors.__catch__/5
(phoenix 1.5.6) lib/phoenix/endpoint/cowboy2_handler.ex:65: Phoenix.Endpoint.Cowboy2Handler.init/4
(cowboy 2.8.0) ~/elixir/deps/cowboy/src/cowboy_handler.erl:37: :cowboy_handler.execute/2
(cowboy 2.8.0) ~/elixir/deps/cowboy/src/cowboy_stream_h.erl:300: :cowboy_stream_h.execute/3
(cowboy 2.8.0) ~/elixir/deps/cowboy/src/cowboy_stream_h.erl:291: :cowboy_stream_h.request_process/3
(stdlib 3.15) proc_lib.erl:226: :proc_lib.init_p_do_apply/3
Marked As Solved
fuelen
Try to update plug_crypto library. It uses :crypto.hmac/3 which was removed in OTP 24.
As you can see on GitHub, newer version of plug_crypto supports OTP 24 plug_crypto/lib/plug/crypto/key_generator.ex at 6ba8fd42a68351459fe6c769ca04aea6022a5cd1 · elixir-plug/plug_crypto · GitHub
Also Liked
CafeRacer
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
manhtranlinh
By this error I have just know now mix there are more interesting options 
Example: mix deps.update --all
kip
:crypto.hmac/3 is not available in OTP 24 (it was deprecated in OTP 23). This is being called from mongodb - which therefore needs updating. And it looks like this commit on September 28th does exactly that.
Since that code appears unreleased you might be able to adjust your mix.exs to be:
def deps do
...
{:mongodb, github: "elixir-mongo/mongodb"},
...
end
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