Failed to load crypto library on mac os

[heiko-braun]

Environment

• Elixir version (elixir -v): Elixir 1.3.4
• Operating system: Mac OS

Current behavior

From ERL

Using the crypto library from erlang succeeds:

Erlang/OTP 19 [erts-8.1] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V8.1  (abort with ^G)
1> crypto:strong_rand_bytes(16).
<<11,212,135,144,175,71,19,174,99,107,69,84,207,22,255,221>>

From Elixir (iex)

Using the same library from elixir fails:

08:41:36.251 [error] Unable to load crypto library. Failed with error:
":load, Library load-call unsuccessful."
OpenSSL might not be installed on this system.


08:41:36.251 [warn]  The on_load function for module crypto returned {:error, {:load, 'Library load-call unsuccessful.'}}

** (UndefinedFunctionError) function :crypto.supports/0 is undefined (module :crypto is not available)
     (crypto) :crypto.supports()
        (ssl) tls_v1.erl:262: :tls_v1.signature_algs/2
        (ssl) ssl.erl:1041: :ssl.handle_hashsigns_option/2
        (ssl) ssl.erl:728: :ssl.handle_options/2
        (ssl) ssl.erl:128: :ssl.connect/4
    (hackney) src/hackney_connect.erl:246: :hackney_connect.do_connect/5
    (hackney) src/hackney_connect.erl:37: :hackney_connect.connect/5
    (hackney) src/hackney.erl:328: :hackney.request/5

```

### Expected behavior

crypto should work form elixir as well.

[josevalim]

How are you starting Elixir and Erlang? Elixir does not do anything in particular to crypto, so it is unlikely to be an Elixir bug. :)

[heiko-braun]

Yes, it's strange. Using crypto straight from iex works as well:

iex(2)> :crypto.strong_rand_bytes(16)
<<106, 213, 80, 219, 233, 136, 129, 19, 254, 58, 199, 203, 28, 140, 34, 95>>

[heiko-braun]

I am running it through iex -S mix

[heiko-braun]

The function that yields the error works as well straight from iex:

iex(1)> :crypto.supports()
[hashs: [:sha, :sha224, :sha256, :sha384, :sha512, :md4, :md5, :ripemd160],
 ciphers: [:des3_cbc, :des_ede3, :des3_cbf, :des3_cfb, :aes_cbc, :aes_cbc128,
  :aes_cfb8, :aes_cfb128, :aes_cbc256, :aes_ctr, :aes_ecb, :aes_ige256,
  :des_cbc, :des_cfb, :des_ecb, :blowfish_cbc, :blowfish_cfb64, :blowfish_ofb64,
  :blowfish_ecb, :rc2_cbc, :rc4, :aes_gcm],
 public_keys: [:rsa, :dss, :dh, :ec_gf2m, :ecdsa, :ecdh, :srp]]

[josevalim]

Do you, by any chance, named your library :crypto or are depending on a project called :crypto?

[ericmj]

I have the same issue if I call :observer.start from iex and then call a function on :crypto:

iex(1)> :observer.start
:ok
iex(2)> :crypto.supports
09:28:21.558 [error] Unable to load crypto library. Failed with error:
":load, Library load-call unsuccessful."
OpenSSL might not be installed on this system.


09:28:21.567 [warn]  The on_load function for module crypto returned {:error, {:load, 'Library load-call unsuccessful.'}}

If I call :crypto first it works:

iex(1)> :crypto.supports
[hashs: [:sha, :sha224, :sha256, :sha384, :sha512, :md4, :md5, :ripemd160],
 ciphers: [:des3_cbc, :des_ede3, :des3_cbf, :des3_cfb, :aes_cbc, :aes_cbc128,
  :aes_cfb8, :aes_cfb128, :aes_cbc256, :aes_ctr, :aes_ecb, :aes_ige256,
  :des_cbc, :des_cfb, :des_ecb, :blowfish_cbc, :blowfish_cfb64, :blowfish_ofb64,
  :blowfish_ecb, :rc2_cbc, :rc4, :aes_gcm],
 public_keys: [:rsa, :dss, :dh, :ec_gf2m, :ecdsa, :ecdh, :srp]]
iex(2)> :observer.start
:ok
iex(3)> :crypto.supports
[hashs: [:sha, :sha224, :sha256, :sha384, :sha512, :md4, :md5, :ripemd160],
 ciphers: [:des3_cbc, :des_ede3, :des3_cbf, :des3_cfb, :aes_cbc, :aes_cbc128,
  :aes_cfb8, :aes_cfb128, :aes_cbc256, :aes_ctr, :aes_ecb, :aes_ige256,
  :des_cbc, :des_cfb, :des_ecb, :blowfish_cbc, :blowfish_cfb64, :blowfish_ofb64,
  :blowfish_ecb, :rc2_cbc, :rc4, :aes_gcm],
 public_keys: [:rsa, :dss, :dh, :ec_gf2m, :ecdsa, :ecdh, :srp]]

Looks like it has something to do with the order applications are loaded.

[ericmj]

This issue happens with erl as well so it's unlikely to be an Elixir issue.

[heiko-braun]

@josevalim no lib or dep called crypto

[heiko-braun]

@ericmj I agree, it's not really an elixir issue I think. @josevalim feel free to close this.

[heiko-braun]

For the record and to back up @ericmj observations:

Calling :crypto.supports() first works, but breaks if I first :debugger.start and then :crypto.supports()

This leads to the error mentioned before. I am pretty new to elixir/erlang, but maybe this does ring a bell for somebody else.

[josevalim]

What are your erlang versions?

[josevalim]

I meant to ask @ericmj, we already know @heiko-braun's. :) Also, how have you both installed it?

[heiko-braun]

I've recompiled erlang from source