I think that those algorithms are useful for more than files and already exist 
in Erlang. What advantage do you see over using

File.open(path) |> :crypto.hash(:md5)

That isn't streaming but I think it is very clear. 

Amos King
Binary Noggin

> On Jun 13, 2017, at 08:43, [email protected] wrote:
> 
> Hello everybody, 
> 
> I propose adding a File.checksum/2 function to create a (md5/sha1/sha256/...) 
> checksum of a given file path.
> The function might have the following signature:
> 
> checksum(String.t, Atom.t) :: {:ok, String.t} | {:error, String.t}
> 
> - The first attribute is the path to the file where a checksum should be 
> computed.
> - The second attribute addresses the used hashing algorithm as an atom e.g. 
> :md5, :sha, :sha256, according to the the algorithms provided by erlang.
> 
> After searching the web for quite a long time, it was hard to find a suitable 
> AND efficient implementation of creating file checksums with Elixir.
> Therefore, I’m convinced this function will help many developers creating 
> file checksums.
> 
> Regards,
> Matthias
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