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ex_keccak

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NIF library for computing Keccak SHA3-256 hashes using tiny-keccak Rust crate.

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ex_keccak native exkeccak src lib.rs
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native/exkeccak/src/lib.rs 

use tiny_keccak::{Hasher, Keccak};

use rustler::types::binary::Binary;

use rustler::types::binary::OwnedBinary;



rustler::init!("Elixir.ExKeccak", [hash_256]);



#[rustler::nif]

fn hash_256<'a>(data: Binary) -> OwnedBinary {

    let mut keccak = Keccak::v256();



    keccak.update(data.as_slice());



    let mut result: [u8; 32] = [0; 32];

    keccak.finalize(&mut result);



    let mut erl_bin: OwnedBinary = OwnedBinary::new(32).unwrap();

    erl_bin.as_mut_slice().copy_from_slice(&result);



    erl_bin

}