Can't start comeonin with Bcrypt

ZastrixArundell

I am adding user Authentication to my webapp and for some reason I am having issues and really don’t know how to solve it (I don’t know if it’s an error on my side or a bug).

(Just as an heads up, I am using windows and I have nmake installed)

I try to add comeonin and Bcrypt like so:

     {:comeonin, "~> 5.0"},
     {:bcrypt_elixir, "~> 2.0"}

Then I do mix deps,get and mix deps.compile bcrypt_elixir, which works completely well and I don’t get any errors.

When I do mix phoenix.server I get the following warning (I am using hash_pwd_salt/1):

warning: function Comeonin.Bcrypt.hash_pwd_salt/1 is undefined or private. Did you mean one of:

      * hashpwsalt/1
      * hashpwsalt/2

If I try using hashpwsalt/1 I get:

** (exit) an exception was raised:
    ** (ArgumentError) Comeonin.Bcrypt.hashpwsalt has been removed.
Add {:bcrypt_elixir, "~> 2.0"} to the deps in your mix.exs file,
and use Bcrypt.hash_pwd_salt instead.

        lib/comeonin/base.ex:32: Comeonin.Bcrypt.error/2
        (ecto) lib/ecto/changeset.ex:1004: Ecto.Changeset.update_change/3
        (dealmailer) web/controllers/user_controller.ex:12: Dealmailer.UserController.create/2
        (dealmailer) web/controllers/user_controller.ex:1: Dealmailer.UserController.action/2
        (dealmailer) web/controllers/user_controller.ex:1: Dealmailer.UserController.phoenix_controller_pipeline/2
        (dealmailer) lib/dealmailer/endpoint.ex:1: Dealmailer.Endpoint.instrument/4
        (dealmailer) lib/phoenix/router.ex:261: Dealmailer.Router.dispatch/2
        (dealmailer) web/router.ex:1: Dealmailer.Router.do_call/2
        (dealmailer) lib/dealmailer/endpoint.ex:1: Dealmailer.Endpoint.phoenix_pipeline/1
        (dealmailer) lib/plug/debugger.ex:123: Dealmailer.Endpoint."call (overridable 3)"/2
        (dealmailer) lib/dealmailer/endpoint.ex:1: Dealmailer.Endpoint.call/2
        (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
        (cowboy) c:/Users/Zastrix/Documents/Phoenix/dealmailer-phoenix/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4

Then I try to downgrade my versions:

     {:comeonin, "~> 4.0"},
     {:bcrypt_elixir, "~> 1.0"}

And I get the dependencies and compile, everything is okay. I don’t get warnings in console when I start the app but when I do actually run it… I get this again (I am using hashpwsalt/1 here)

** (exit) an exception was raised:
    ** (ArgumentError) Comeonin.Bcrypt.hashpwsalt has been removed.
Add {:bcrypt_elixir, "~> 2.0"} to the deps in your mix.exs file,
and use Bcrypt.hash_pwd_salt instead.

        lib/comeonin/base.ex:32: Comeonin.Bcrypt.error/2
        (ecto) lib/ecto/changeset.ex:1004: Ecto.Changeset.update_change/3
        (dealmailer) web/controllers/user_controller.ex:12: Dealmailer.UserController.create/2
        (dealmailer) web/controllers/user_controller.ex:1: Dealmailer.UserController.action/2
        (dealmailer) web/controllers/user_controller.ex:1: Dealmailer.UserController.phoenix_controller_pipeline/2
        (dealmailer) lib/dealmailer/endpoint.ex:1: Dealmailer.Endpoint.instrument/4
        (dealmailer) lib/phoenix/router.ex:261: Dealmailer.Router.dispatch/2
        (dealmailer) web/router.ex:1: Dealmailer.Router.do_call/2
        (dealmailer) lib/dealmailer/endpoint.ex:1: Dealmailer.Endpoint.phoenix_pipeline/1
        (dealmailer) lib/plug/debugger.ex:123: Dealmailer.Endpoint."call (overridable 3)"/2
        (dealmailer) lib/dealmailer/endpoint.ex:1: Dealmailer.Endpoint.call/2
        (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
        (cowboy) c:/Users/Zastrix/Documents/Phoenix/dealmailer-phoenix/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4

6 comments

/phoenix #bcrypt #comeonin

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2020-03-14 12:15:58 UTC

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wolfiton

Hi,

Can you update your bcrypt to use {bcrypt, "~> 2.0.3"},

Also have a look at the docs Bcrypt — bcrypt_elixir v3.3.2

Can you also share the file where you use bcrypt to register the users?

Post #1

wolfiton

Also wouldn’t the function to hash and add a salt, be this hash_pwd_salt/2?

Post #2

ZastrixArundell

Looks like I fixed the issue. It wasn’t a bug from compiling like I thought. I used this tutorial where I need to alias this:

alias Comeonin.Bcrypt

Now when I read the Bcrypt example docs, it looked like that Bcrypt didn’t really need this alias in order to work. I tested it out and lo and behold I didn’t get an error.

I guess that I tried to alias a module which didn’t really exist or was not the one correct to use so my app didn’t really manage to find it, but it worked without the alias.

Post #3

ezkemboi

When using using

{:comeonin, "~> 5.0"},
     {:bcrypt_elixir, "~> 2.1"}

the best way to encrypt password is using

Bcrypt.Base.hash_password(password, Bcrypt.gen_salt(12, true))

For more information Check Bcrypt Docs

Post #4

bnymn

As far as I understand, we don’t really need to use comeonin. It seems like that bcrypt_elixir does all the work. Is that correct?

Post #5

LostKobrakai

Yes and no. comeonin still holds the behaviour all the concrete packages implement. It’s a dependency of all of them. If you depend on the behaviour of comeonin and not just a single concrete implementation I feels it’s still good to list comeonin as explicit dependency. Because switching to another password hashing package does not change your dependency on the common interface.

Post #6

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