// Copyright 2015-2016 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

//! EdDSA Signatures.

use super::ops::ELEM_LEN;
use crate::digest;

pub mod signing;
pub mod verification;

/// The length of an Ed25519 public key.
pub const ED25519_PUBLIC_KEY_LEN: usize = ELEM_LEN;

pub fn eddsa_digest(signature_r: &[u8], public_key: &[u8], msg: &[u8]) -> digest::Digest {
    let mut ctx = digest::Context::new(&digest::SHA512);
    ctx.update(signature_r);
    ctx.update(public_key);
    ctx.update(msg);
    ctx.finish()
}