sha256 test

main.rs

extern crate ring;
extern crate time;

use ring::digest::digest;
use ring::digest::SHA256;

fn hash(s: &[u8]) -> Vec<u8> {
	let hasher = digest(&SHA256, s);
	hasher.as_ref().to_vec()
}

fn tohex(input: Vec<u8>) -> String {
	let output: Vec<String> = input.iter().map(|b| format!("{:02X}", b)).collect();
	output.join("")
}

fn main() {
	let s0 = "abc".as_bytes();
	let s1 = "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq".as_bytes();
	let vs2 = vec![b'a'; 1000000];
	let s2 = vs2.as_slice();
	let ss3 = String::new() +
		"Above the broad circular chews his shaped symptom. " +
		"The spectrum treasures a bush finger around the salary. " +
		"The daily rope breezes into a companion. " +
		"The wolf suffers the law after the legal cyclist. " +
		"The craft volunteers the attitude. " +
		"The amazing freedom weds throughout the cross gesture.";
	let s3 = ss3.as_bytes();
	
	println!("s0 hash: {}", tohex(hash(s0)));
	println!("s1 hash: {}", tohex(hash(s1)));
	println!("s2 hash: {}", tohex(hash(s2)));
	println!("s3 hash: {}", tohex(hash(s3)));

	let start = time::now();
	for _ in 0..1000 {
		hash(s0);
		hash(s1);
		hash(s2);
		hash(s3);
	}
	println!("time: {}", time::now() - start);
}