use hex_literal::hex;
use sha2::{Sha256, Sha512, Digest};

// create a Sha256 object
let mut hasher = Sha256::new();

// write input message
hasher.update(b"hello world");

// read hash digest and consume hasher
let result = hasher.finalize();

assert_eq!(result[..], hex!("
    b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
")[..]);

// same for Sha512
let mut hasher = Sha512::new();
hasher.update(b"hello world");
let result = hasher.finalize();

assert_eq!(result[..], hex!("
    309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f
    989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f
")[..]);