9.1.2. 使用 HMAC 摘要对消息进行签名和验证

ring-badge cat-cryptography-badge

使用 ring::hmac 创建字符串的签名 hmac::Signature，然后验证签名是否正确。

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

fn main() -> Result<(), Unspecified> {
    let mut key_value = [0u8; 48];
    let rng = rand::SystemRandom::new();
    rng.fill(&mut key_value)?;
    let key = hmac::Key::new(hmac::HMAC_SHA256, &key_value);

    let message = "Legitimate and important message.";
    println!("{}", &message);

    let signature = hmac::sign(&key, message.as_bytes());
    println!("{:?}", &signature);

    hmac::verify(&key, message.as_bytes(), signature.as_ref())?;
    
    Ok(())
}