ironcore-documents 0.3.0-pre.0

A library for working with IronCore Labs documents and header formats.
Documentation 
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use hmac::{Hmac, Mac};
use sha2::Sha256;

type HmacSha256 = Hmac<Sha256>;
pub struct Signature(pub [u8; 32]);

pub const AES_KEY_LEN: usize = 32;

pub fn sign_hs256(key: [u8; AES_KEY_LEN], payload: &[u8]) -> Signature {
    let mut mac = HmacSha256::new_from_slice(&key)
        .expect("The key has a fixed size, which is known to be good.");
    mac.update(payload);
    let result = mac.finalize();
    Signature(result.into_bytes().into())
}

pub fn verify_hs256(key: [u8; AES_KEY_LEN], payload: &[u8], sig: &Signature) -> bool {
    let mut mac = HmacSha256::new_from_slice(&key)
        .expect("The key has a fixed size, which is known to be good.");
    mac.update(payload);
    mac.verify_slice(&sig.0).is_ok()
}