Otp 24 crypto fixes #83
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…stead of the removed :crypto.block_decrypt.
…EYS and SECRET_KEY_BASE that are adequately sized bitstrings to ensure that the cipher selection in aead.c in the Erlang :crypto module can find the :aes_256_gcm cipher. Cipher selection depends upon both the atom given to the Erlang NIF and the key size.
… and clean up some warnings.
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I had this CI problem locally as well. |
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Code changes LGTM. 👍 |
Codecov Report
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## master #83 +/- ##
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Coverage 100.00% 100.00%
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Files 23 23
Lines 100 128 +28
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+ Hits 100 128 +28
Continue to review full report at Codecov.
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@kgautreaux Ideally you'd want to use a config file to change these values, but your solution works. You're right in that @@ -10,6 +10,7 @@ defmodule Fields.MixProject do
start_permanent: Mix.env() == :prod,
deps: deps(),
package: package(),
+ elixirc_paths: elixirc_paths(Mix.env()),
@@ -28,6 +29,9 @@ defmodule Fields.MixProject do
+ defp elixirc_paths(:test), do: ["lib", "test/support"]
+ defp elixirc_paths(_), do: ["lib"]edit: Didn't realise you were setting environment variables in the TestCase |
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Added the environment variables to a config file and re-used the previous testing values. @nelsonic Should be good to merge now 👍 |
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@kgautreaux thank you so much for your efforts on this update. 🥇
@th0mas thanks for helping get the PR over the line. ⭐
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attempting to run getting the following error: Investigating ... 🔍 |
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For reference: Tried: From reading https://github.com/elixir-lang/ex_doc/blob/master/lib/ex_doc.ex#L2 |
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Looks like the |
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@kgautreaux |
Sorry for the delay pushing the branch.
As you can see the actual fix for the removed
:crypto.block_encryptand:crypto.block_decryptin OTP 24 is literally two lines inaes.ex, but the fixes caused a cascade of errors in the test suite.I finally got some time the last few days to spelunk into the Erlang
:cryptomodule and the NIF's inaead.c. I relate the story here because I think it is interesting.The test suite instructions here currently recommend running the test suite with manually set env vars (
ENCRYPTION_KEYS="key1,key2" SECRET_KEY_BASE="key" mix test), which must have worked fine in the:crypto.block_encryptdays, but after a lot of trial, error, and pretending I know how to read C I realized that in the OTP 24 era the cipher selection depends both on the atom passed to:crypto.crypto_one_time_aeadand the key size.So if you pass
:aes_256_gcmas the cipher but you pass thebinary"key1" as the key then your key size is only 24 bytes which corresponds to:aes_192_gcmnot the:aes_256_gcmthat you passed as your selected cipher and Erlang gives up and throws the:badargexception saying that you have anunknown cipher.So to fix the test suite failures we just have to make sure we pass a 32 byte key, but it seemed more ergonomic to me to try to inject the key as a dependency at run-time during the tests rather than rely on the tester passing the key with the right length as an env var.
That is why I changed the module attribute key extraction to a function so that it could be evaluated at run-time instead of compile time, and in the future an arbitrary key could be passed in during testing.
I think if I knew more about
ExUnitthis would have been a great idea, but instead I blundered my way into making aExUnit.CaseTemplateusing module as the basis for the testing so that common setup for the generated keys could be injected into each test module. I'm still not sure this is a good solution, but here we are.After all of that I figured I better actually commit something so I
@tag :skip-ed the failinghashtests, which have hardcoded binary's for the comparison tests and don't tolerate the custom setup I introduced.I apologize for the length I didn't have time to make it shorter.