// Copyright 2023 Cryspen Sarl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0

#![no_std]

extern crate alloc;

// NOTE: This Digest trait and the new `digest` trait APIs overlap to some extent.
// See issue #1039
/// A Hash algorithm returning hashes of length `HASH_LEN`.
pub trait Digest<const HASH_LEN: usize> {
    /// Writes the digest for the given input byte slice, into `digest` in immediate mode.
    fn hash(digest: &mut [u8], payload: &[u8]);

    /// Add the `payload` to the digest.
    fn update(&mut self, payload: &[u8]);

    /// Writes the digest into `digest`.
    ///
    /// Note that the digest state can be continued to be used, to extend the
    /// digest.
    fn finish(&self, digest: &mut [u8; HASH_LEN]);

    /// Reset the digest state.
    fn reset(&mut self);
}

pub mod digest;
pub mod kem;