Function checksum 

pub fn checksum<P>(path: P) -> Option<String>
where
    P: Into<PathBuf>,

Get SHA256 hash of a file

See https://rust-lang-nursery.github.io/rust-cookbook/cryptography/hashing.html

Example

use acorn_lib::util::checksum;

let checksum = checksum("path/to/file");
assert!(checksum.is_some());