Variables are not supported for configuring the module.

[rcosnita]

It would be extremely beneficial to support variables while configuring the module. This will give us the possibility to implement rotating IV for each encrypted session.

In addition, it allows us to mix the current module nicely with other extensions: e.g njs. Here is an example about the desired behaviour:

set $encryptionKey "abcdefghijklmnopqrstuvwxyz123456";
set $encryptionIV "1234567812345678";

encrypted_session_key $encryptionKey;
encrypted_session_iv $encryptionIV;

I would expect this to work but unfortunately the code treats this literally.

[rcosnita]

I will provide a PR for addressing this issue.