use ring::{
    hmac, rand, error::Unspecified,
    digest,
};

fn main() -> Result<(), Unspecified> {
    {
        println!("{} HHmac {}", "-".repeat(10), "-".repeat(10));
        let rng = rand::SystemRandom::new();
        let key = hmac::Key::generate(hmac::HMAC_SHA256, &rng)?;

        let msg = "hello, world";
        let tag = hmac::sign(&key, msg.as_bytes());

        println!("{:?}", tag);
        hmac::verify(&key, msg.as_bytes(), tag.as_ref())?;
        println!("Verify success");
    }
    {
        println!("{} SHA256 {}", "-".repeat(10), "-".repeat(10));
        let sha256 = digest::digest(&digest::SHA256, b"hello, world");
        println!("{:?}", sha256);
    }

    Ok(())
}