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use std::fmt;
use std::sync::Mutex;
use std::error::Error;
use x25519_dalek::PublicKey;
use x25519_dalek::SharedSecret;
use generic_array::typenum::U32;
use generic_array::GenericArray;
use crate::timestamp;
// config error
#[derive(Debug)]
pub struct ConfigError(String);
impl ConfigError {
pub fn new(s : &str) -> Self {
ConfigError(s.to_string())
}
}
impl fmt::Display for ConfigError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ConfigError({})", self.0)
}
}
impl Error for ConfigError {
fn description(&self) -> &str {
&self.0
}
fn source(&self) -> Option<&(dyn Error + 'static)> {
None
}
}
// handshake error
#[derive(Debug)]
pub struct HandshakeError {}
impl HandshakeError {
pub fn new() -> Self {
HandshakeError{}
}
}
impl fmt::Display for HandshakeError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "HandshakeError")
}
}
impl Error for HandshakeError {
fn description(&self) -> &str {
"Generic Handshake Error"
}
fn source(&self) -> Option<&(dyn Error + 'static)> {
None
}
}
// types for resulting key-material
struct Key {
key : [u8; 32],
id : u32
}
pub struct KeyPair {
confimed : bool, // has the key-pair been confirmed?
send : Key, // key for outbound messages
recv : Key // key for inbound messages
}
pub struct Output (
Option<KeyPair>, // resulting key-pair of successful handshake
Option<Vec<u8>> // message to send
);
// per-peer state machine
pub type Psk = [u8; 32];
pub struct Peer {
// mutable state
pub state : Mutex<State>,
// constant state
pub pk : PublicKey, // public key of peer
pub ss : SharedSecret, // precomputed DH(static, static)
pub psk : Psk // psk of peer
}
pub enum State {
Reset{
ts : Option<timestamp::TAI64N>
},
InitiationSent{
hs : GenericArray<u8, U32>,
ck : GenericArray<u8, U32>
},
}
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