sha256 digest

Examples

sha256 digest string

```rust use sha256::digest;

fn main() { let input = "hello"; let val = digest(input); assert_eq!(val, "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824") } ```

sha256 digest bytes

```rust use sha256::digest_bytes;

fn main() { let input = "hello".asbytes(); let val = digestbytes(input); assert_eq!(val, "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824") } ```

sha256 digest file

```rust use sha256::digest_file; use std::path::Path;

fn main() { let input = Path::new("./foo.file"); let val = digestfile(input).unwrap(); asserteq!(val, "433855b7d2b96c23a6f60e70c655eb4305e8806b682a9596a200642f947259b1") } ```