ExKeccak is a NIF that wraps the KECCAK-256 function from the tiny-keccak Rust library. KECCAK-256 is used by Ethereum.

ex_keccak requires Rust to be installed.

The package can be installed by adding ex_keccak to your list of dependencies in mix.exs:

def deps do
  [
    {:ex_keccak, "~> 0.1.2"}
  ]
end

To calculate KECCAK-256 hash, use ExKeccak.hash_256/1 function. It returns {:ok, result} on success:

{
  :ok,
  <<28, 138, 255, 149, 6, 133, 194, 237, 75, 195, 23, 79, 52, 114, 40, 123, 86, 217, 81, 123, 156, 148, 129, 39, 49, 154, 9, 167, 163, 109, 234, 200>>
} = ExKeccak.hash_256("hello")

And it returns {:error, :invalid_type} if the provided data is not binary:

{:error, :invalid_type} = ExKeccak.hash_256(11)

1. Fork it!
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

ExKeccak is released under the Apache-2.0 License.