Trying to understand documentation

[laiboonh]

Hi all, i have a few beginner questions

1. am i right to say that :crypto is a library from erlang and not elixir?
2. :crypto.hash(:md5, input) this works but in the documentation show below :md5 is not one of the type mentioned. So what happening? Is the doc wrong?

iex(3)> h :crypto.hash/2
* :crypto.hash/2

  @spec hash(type, data) :: digest
        when type:
               sha1()
               | sha2()
               | sha3()
               | :ripemd160
               | compatibility_only_hash(),
             data: iodata(),
             digest: binary()

[derek-zhou]

md5 is part of the compatibility_only_hash()

crypto — OTP 29.0.2 (crypto 5.9)

[kokolegorille]

… and yes, it’s from Erlang, as You can guess from the atom name

[Eiji]

@laiboonh

am i right to say that :crypto is a library from erlang and not elixir?

It’s part of Erlang core - similarly to how String is in Elixir core.

@laiboonh

:crypto.hash(:md5, input) this works but in the documentation show below :md5 is not one of the type mentioned. So what happening? Is the doc wrong?

You need to take a look at crypto documentation:

compatibility_only_hash() = md5 | md4

The compatibility_only_hash() algorithms are recommended only for compatibility with existing applications.
Source: crypto — OTP 29.0.2 (crypto 5.9)