Implement Ed25519 encryption

Peer A send message to peer B:

Peer A generate ephemeral ed25519 keypair and generate shared secret with couple (ephemeral_secret_key, B_public_key).
Encryption use aes256 or chacha20 (not yet determined) key derived from shared secret.

Peer b get shared secret with couple (B_secret_key, ephemeral_public_key)

For DH, i plan to use curve25519_dalek to generate agreement with one of the two keypairs that isn't ephemeral.

fn generate_shared(secret: &SecretKey, public: &PublicKey) -> [u8; 32] {
    let public = public.to_point();
    let secret = Scalar::from_bits(secret.to_bytes());
    let shared_point = public * secret;
    let shared_point_compressed = shared_point.compress();

    let output = shared_point_compressed.as_bytes().to_owned();

    output
}

mentioned in commit c16a6415

mentioned in commit 452a2ac2

mentioned in commit 57df0ae9

mentioned in commit c296b14b

mentioned in commit fceb201b

mentioned in commit e88f69c1

mentioned in commit 86fa9833

closed via merge request !8 (merged)