zino-core 0.43.1

Core types and traits for zino.
Documentation 
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use hkdf::Hkdf;
use sm3::{Digest, Sm3};

/// Derives a key with HKFD-HMAC-SM3.
pub fn derive_key(info: &str, prk: &[u8]) -> [u8; 64] {
    let info = format!("{info};CHECKSUM:SM3;HKDF:HMAC-SM3");
    let mut okm = [0; 64];
    Hkdf::<Sm3>::from_prk(prk)
        .expect("pseudorandom key is not long enough")
        .expand(info.as_bytes(), &mut okm)
        .expect("invalid length to output");
    okm
}

/// Digests the data with SM3.
#[inline]
pub fn digest(data: &[u8]) -> [u8; 32] {
    let mut hasher = Sm3::new();
    hasher.update(data);
    hasher.finalize().into()
}