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

rakeshtripathy

Hello,

I have upgraded to OTP 24 and the application gives me below error.

2023-05-08T09:39:40.016516261Z ** (UndefinedFunctionError) function :crypto.hmac/3 is undefined or private
2023-05-08T09:39:40.016521861Z     (crypto 5.0.6.3) :crypto.hmac(:sha256, <<215, 151, 119, 26, 127, 8, 146, 85, 15, 210, 233, 150, 234, 49, 71, 114, 253, 119, 149, 8, 92, 166, 200, 71, 173, 68, 192, 10, 124, 239, 15, 252, 84, 185, 202, 48, 189, 229, 78, 102, 229, 58, 112, 117, 209, 144, 87, 238, 33, 56, ...>>, 'PUT\n\n\n40976\n\napplication/octet-stream\n\n\n\n\n\n\nx-ms-blob-type:BlockBlob\nx-ms-date:Mon, 08 May 2023 09:39:40 GMT\nx-ms-version:2014-02-14\n/test001/uploads/test/docs/test_create/6318/lfp.4d2bffda-5cd1-4d9a-b71a-8d7cd293c197.19f2a673-1f3a-4e06-9257-749b3c09a2b9.original.pdf')
2023-05-08T09:39:40.016528661Z     (erlazure 0.2) /app/deps/erlazure/src/erlazure.erl:756: :erlazure.get_shared_key/7
2023-05-08T09:39:40.016532861Z     (erlazure 0.2) /app/deps/erlazure/src/erlazure.erl:717: :erlazure.execute_request/2
2023-05-08T09:39:40.016537061Z     (erlazure 0.2) /app/deps/erlazure/src/erlazure.erl:530: :erlazure.handle_call/3
2023-05-08T09:39:40.016541161Z     (stdlib 3.17.2.2) gen_server.erl:721: :gen_server.try_handle_call/4
2023-05-08T09:39:40.016544962Z     (stdlib 3.17.2.2) gen_server.erl:750: :gen_server.handle_msg/6
2023-05-08T09:39:40.016548962Z     (stdlib 3.17.2.2) proc_lib.erl:226: :proc_lib.init_p_do_apply/3
2023-05-08T09:39:40.016567662Z Last message (from #PID<0.5946.0>): {:put_blob, 'uploads', 'test/docs/test_create/6318/lfp.4d2bffda-5cd1-4d9a-b71a-8d7cd293c197.19f2a673-1f3a-4e06-9257-749b3c09a2b9.original.pdf', :block_blob, <<37, 80, 68, 70, 45, 49, 46, 52, 10, 49, 32, 48, 32, 111, 98, 106, 10, 60, 60, 10, 47, 84, 105, 116, 108, 101, 32, 40, 254, 255, 0, 76, 0, 101, 0, 116, 0, 116, 0, 101, 0, 114, 0, 32, 0, ...>>, []}

Please help to resolve this issue.

12 comments

/phoenix #erlang #elixir-upgrade

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2023-07-11 18:16:46 UTC

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LostKobrakai

Post #1

rakeshtripathy

currently I am using :plug_crypto, “1.2.5”, but I feel the issue is with erlazure and the errors comes while uploading files into azure storage.

Post #2

al2o3cr

A fix for this was merged a while back, but I’m not sure if it was packaged into a release:

https://github.com/dkataskin/erlazure/pull/33

Post #3

rakeshtripathy

Thank you for quick response, could you please guide me how can I check and confirm the same and the next step to proceed further.

Post #4

apoorv-2204

I think you need to update plug crypto. from this it looks like you are using otp >24. OTP has updated hmac funtion.

Post #5

rakeshtripathy

I am using OTP 24, and plug_crypto : “1.2.5” i.e. the latest version.

Post #6

al2o3cr

Until a version of :erlazure is released with the fixes, you should be able to add git: "https://github.com/dkataskin/erlazure.git" to the :erlazure dependency in your mix.exs to use the code directly from there.

Post #7

rakeshtripathy

I tried with this change, but it doesn’t work and gives same errors.

Post #8

s6o

I encountered the same error when upgrading and old project from OTP22/Elixir 1.9.4 to OTP24/Elixir 1.14.
If I read the documentation correctly the solution is to now use :crypto.mac functions, as the :crypto.hmac/3 is no longer present in OTP24.

In my case I replaced my :crypto.hmac/3 call with :crypto.mac/3

Post #9

al2o3cr

Either that means:

the updated dependency hasn’t been installed. Make sure you’ve done mix deps.get after changing it. What does your mix.lock file show now?
or there’s another bug that wasn’t fixed by the changes to erlazure in the “fix crypto deprecations” PR