Encryption primitives; Continue work on handshake

Cargo.toml

@@ -18,5 +18,5 @@ tiny-keccak = "0.3"
 rocksdb = "0.2.1"
 num = "0.1"
 lazy_static = "0.1.*"
-secp256k1 = "0.5.1"
+eth-secp256k1 = { git = "https://github.com/arkpar/rust-secp256k1.git" }
 rust-crypto = "0.2.34"

src/crypto.rs

@@ -5,7 +5,8 @@ use rand::os::OsRng;
 
 pub type Secret=H256;
 pub type Public=H512;
-pub type Signature=H520;
+
+pub use ::sha3::Hashable;
 
 #[derive(Debug)]
 pub enum CryptoError {
@@ -94,8 +95,13 @@ impl KeyPair {
 	}
 }
 
-/// Recovers Public key from signed message hash.
+pub mod ec {
-pub fn recover(signature: &Signature, message: &H256) -> Result<Public, CryptoError> {
+	use hash::*;
+	use crypto::*;
+
+	pub type Signature = H520;
+	/// Recovers Public key from signed message hash.
+	pub fn recover(signature: &Signature, message: &H256) -> Result<Public, CryptoError> {
 		use secp256k1::*;
 		let context = Secp256k1::new();
 		let rsig = try!(RecoverableSignature::from_compact(&context, &signature[0..64], try!(RecoveryId::from_i32(signature[64] as i32))));
@@ -103,21 +109,21 @@ pub fn recover(signature: &Signature, message: &H256) -> Result<Public, CryptoEr
 		let serialized = publ.serialize_vec(&context, false);
 		let p: Public = Public::from_slice(&serialized[1..65]);
 		Ok(p)
-}
+	}
-/// Returns siganture of message hash.
+	/// Returns siganture of message hash.
-pub fn sign(secret: &Secret, message: &H256) -> Result<Signature, CryptoError> {
+	pub fn sign(secret: &Secret, message: &H256) -> Result<Signature, CryptoError> {
 		use secp256k1::*;
 		let context = Secp256k1::new();
 		let sec: &key::SecretKey = unsafe { ::std::mem::transmute(secret) };
 		let s = try!(context.sign_recoverable(&try!(Message::from_slice(&message)), sec));
 		let (rec_id, data) = s.serialize_compact(&context);
-	let mut signature: ::crypto::Signature = unsafe { ::std::mem::uninitialized() };
+		let mut signature: ec::Signature = unsafe { ::std::mem::uninitialized() };
 		signature.clone_from_slice(&data);
 		signature[64] = rec_id.to_i32() as u8;
 		Ok(signature)
-}
+	}
-/// Verify signature.
+	/// Verify signature.
-pub fn verify(public: &Public, signature: &Signature, message: &H256) -> Result<bool, CryptoError> {
+	pub fn verify(public: &Public, signature: &Signature, message: &H256) -> Result<bool, CryptoError> {
 		use secp256k1::*;
 		let context = Secp256k1::new();
 		let rsig = try!(RecoverableSignature::from_compact(&context, &signature[0..64], try!(RecoveryId::from_i32(signature[64] as i32))));
@@ -133,8 +139,108 @@ pub fn verify(public: &Public, signature: &Signature, message: &H256) -> Result<
 			Err(Error::IncorrectSignature) => Ok(false),
 			Err(x) => Err(<CryptoError as From<Error>>::from(x))
 		}
+	}
 }
 
+pub mod ecdh {
+	use crypto::*;
+
+	pub fn agree(secret: &Secret, public: &Public, ) -> Result<Secret, CryptoError> {
+		use secp256k1::*;
+		let context = Secp256k1::new();
+		let mut pdata: [u8; 65] = [4u8; 65];
+		let ptr = pdata[1..].as_mut_ptr();
+		let src = public.as_ptr();
+		unsafe { ::std::ptr::copy_nonoverlapping(src, ptr, 64) };
+		let publ = try!(key::PublicKey::from_slice(&context, &pdata));
+		let sec: &key::SecretKey = unsafe { ::std::mem::transmute(secret) };
+		let shared = ecdh::SharedSecret::new_raw(&context, &publ, &sec);
+		let s: Secret = unsafe { ::std::mem::transmute(shared) };
+		Ok(s)
+	}
+}
+
+pub mod ecies {
+	use hash::*;
+	use bytes::*;
+	use crypto::*;
+
+	pub fn encrypt(public: &Public, plain: &[u8]) -> Result<Bytes, CryptoError> {
+		use ::rcrypto::digest::Digest;
+		use ::rcrypto::sha2::Sha256;
+		use ::rcrypto::hmac::Hmac;
+		use ::rcrypto::mac::Mac;
+		let r = try!(KeyPair::create());
+		let z = try!(ecdh::agree(r.secret(), public));
+		let mut key = [0u8; 32];
+		let mut mkey = [0u8; 32];
+		kdf(&z, &[0u8; 0], &mut key);
+		let mut hasher = Sha256::new();
+		let mkey_material = &key[16..32];
+		hasher.input(mkey_material);
+		hasher.result(&mut mkey);
+		let ekey = &key[0..16];
+
+		let mut msg = vec![0u8; (1 + 64 + 16 + plain.len() + 32)];
+		msg[0] = 0x04u8;
+		{
+			let msgd = &mut msg[1..];
+			r.public().copy_to(&mut msgd[0..64]);
+			{
+				let cipher = &mut msgd[(64 + 16)..(64 + 16 + plain.len())];
+				aes::encrypt(ekey, &H128::new(), plain, cipher);
+			}
+			let mut hmac = Hmac::new(Sha256::new(), &mkey);
+			{
+				let cipher_iv = &msgd[64..(64 + 16 + plain.len())];
+				hmac.input(cipher_iv);
+			}
+			hmac.raw_result(&mut msgd[(64 + 16 + plain.len())..]);
+		}
+		Ok(msg)
+	}
+
+	fn kdf(secret: &Secret, s1: &[u8], dest: &mut [u8]) {
+		use ::rcrypto::digest::Digest;
+		use ::rcrypto::sha2::Sha256;
+		let mut hasher = Sha256::new();
+		// SEC/ISO/Shoup specify counter size SHOULD be equivalent
+		// to size of hash output, however, it also notes that
+		// the 4 bytes is okay. NIST specifies 4 bytes.
+		let mut ctr = 1u32;
+		let mut written = 0usize;
+		while written < dest.len() {
+			let ctrs = [(ctr >> 24) as u8, (ctr >> 16) as u8, (ctr >> 8) as u8, ctr as u8];
+			hasher.input(&ctrs);
+			hasher.input(secret);
+			hasher.input(s1);
+			hasher.result(&mut dest[written..(written + 32)]);
+			hasher.reset();
+			written += 32;
+			ctr += 1;
+		}
+	}
+}
+
+pub mod aes {
+	use hash::*;
+	use ::rcrypto::blockmodes::*;
+	use ::rcrypto::aessafe::*;
+	use ::rcrypto::symmetriccipher::*;
+	use ::rcrypto::buffer::*;
+
+	pub fn encrypt(k: &[u8], iv: &H128, plain: &[u8], dest: &mut [u8]) {
+		let mut encryptor = CtrMode::new(AesSafe128Encryptor::new(k), iv[..].to_vec());
+		encryptor.encrypt(&mut RefReadBuffer::new(plain), &mut RefWriteBuffer::new(dest), true).expect("Invalid length or padding");
+	}
+
+	pub fn decrypt(k: &[u8], iv: &H128, encrypted: &[u8], dest: &mut [u8]) {
+		let mut encryptor = CtrMode::new(AesSafe128Encryptor::new(k), iv[..].to_vec());
+		encryptor.decrypt(&mut RefReadBuffer::new(encrypted), &mut RefWriteBuffer::new(dest), true).expect("Invalid length or padding");
+	}
+}
+
+
 #[cfg(test)]
 mod tests {
 

src/hash.rs

@@ -2,7 +2,7 @@ use std::str::FromStr;
 use std::fmt;
 use std::ops;
 use std::hash::{Hash, Hasher};
-use std::ops::{Index, IndexMut, Deref, DerefMut, BitOr, BitAnd};
+use std::ops::{Index, IndexMut, Deref, DerefMut, BitOr, BitAnd, BitXor};
 use rustc_serialize::hex::*;
 use error::EthcoreError;
 use rand::Rng;
@@ -19,6 +19,7 @@ pub trait FixedHash: Sized + BytesConvertable {
 	fn mut_bytes(&mut self) -> &mut [u8];
 	fn from_slice(src: &[u8]) -> Self;
 	fn clone_from_slice(&mut self, src: &[u8]) -> usize;
+	fn copy_to(&self, dest: &mut [u8]);
 	fn shift_bloom<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash;
 	fn bloom_part<T>(&self, m: usize) -> T where T: FixedHash;
 	fn contains_bloom<T>(&self, b: &T) -> bool where T: FixedHash;
@@ -95,6 +96,13 @@ macro_rules! impl_hash {
 				r
 			}
 
+			fn copy_to(&self, dest: &mut[u8]) {
+				unsafe {
+					let min = ::std::cmp::min($size, dest.len());
+					::std::ptr::copy(self.0.as_ptr(), dest.as_mut_ptr(), min);
+				}
+			}
+
 			fn shift_bloom<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash {
 				let bp: Self = b.bloom_part($size);
 				let new_self = &bp | self;
@@ -299,6 +307,30 @@ macro_rules! impl_hash {
 			}
 		}
 
+		/// BitXor on references
+		impl <'a> BitXor for &'a $from {
+			type Output = $from;
+
+			fn bitxor(self, rhs: Self) -> Self::Output {
+				unsafe {
+					use std::mem;
+					let mut ret: $from = mem::uninitialized();
+					for i in 0..$size {
+						ret.0[i] = self.0[i] ^ rhs.0[i];
+					}
+					ret
+				}
+			}
+		}
+
+		/// Moving BitXor
+		impl BitXor for $from {
+			type Output = $from;
+
+			fn bitxor(self, rhs: Self) -> Self::Output {
+				&self ^ &rhs
+			}
+		}
 		impl $from {
 			pub fn hex(&self) -> String {
 				format!("{}", self)

src/lib.rs

@@ -34,7 +34,7 @@ pub mod math;
 pub mod chainfilter;
 pub mod crypto;
 
-//pub mod network;
+pub mod network;
 
 // reexports
 pub use std::str::FromStr;

src/network/connection.rs

@@ -0,0 +1,109 @@
+use std::io::{self, Cursor, Read};
+use mio::*;
+use mio::tcp::*;
+use hash::*;
+use bytes::*;
+use network::host::Host;
+
+pub struct Connection {
+	pub token: Token,
+    pub socket: TcpStream,
+	rec_buf: Bytes,
+	rec_size: usize,
+	send_buf: Cursor<Bytes>,
+	interest: EventSet,
+}
+
+pub enum WriteStatus {
+	Ongoing,
+	Complete
+}
+
+impl Connection {
+	pub fn new(token: Token, socket: TcpStream) -> Connection {
+		Connection {
+			token: token,
+			socket: socket,
+			send_buf: Cursor::new(Bytes::new()),
+			rec_buf: Bytes::new(),
+			rec_size: 0,
+			interest: EventSet::hup(),
+		}
+	}
+
+	pub fn expect(&mut self, size: usize) {
+		if self.rec_size != self.rec_buf.len() {
+			warn!(target:"net", "Unexpected connection read start");
+		}
+		unsafe { self.rec_buf.set_len(size) }
+		self.rec_size = size;
+	}
+
+	pub fn readable(&mut self) -> io::Result<Option<&[u8]>> {
+		if self.rec_size == 0 || self.rec_buf.len() >= self.rec_size {
+			warn!(target:"net", "Unexpected connection read");
+		}
+		let max = self.rec_size - self.rec_buf.len();
+		// resolve "multiple applicable items in scope [E0034]" error
+    	let sock_ref = <TcpStream as Read>::by_ref(&mut self.socket);
+		match sock_ref.take(max as u64).try_read_buf(&mut self.rec_buf) {
+			Ok(Some(_)) if self.rec_buf.len() == self.rec_size => Ok(Some(&self.rec_buf[0..self.rec_size])),
+			Ok(_) => Ok(None),
+			Err(e) => Err(e),
+		}
+	}
+	
+	pub fn send(&mut self, data: &[u8]) { //TODO: take ownership version
+		let send_size = self.send_buf.get_ref().len();
+		if send_size != 0 || self.send_buf.position() as usize >= send_size {
+			warn!(target:"net", "Unexpected connection send start");
+		}
+		if self.send_buf.get_ref().capacity() < data.len() {
+			let capacity = self.send_buf.get_ref().capacity();
+			self.send_buf.get_mut().reserve(data.len() - capacity);
+		}
+		unsafe { self.send_buf.get_mut().set_len(data.len()) }
+		unsafe { ::std::ptr::copy_nonoverlapping(data.as_ptr(), self.send_buf.get_mut()[..].as_mut_ptr(), data.len()) };
+        if !self.interest.is_writable() {
+            self.interest.insert(EventSet::writable());
+        }
+	}
+
+	pub fn writable(&mut self) -> io::Result<WriteStatus> {
+		let send_size = self.send_buf.get_ref().len();
+		if (self.send_buf.position() as usize) >= send_size {
+			warn!(target:"net", "Unexpected connection data");
+			return Ok(WriteStatus::Complete)
+		}
+		match self.socket.try_write_buf(&mut self.send_buf) {
+			Ok(_) if (self.send_buf.position() as usize) < send_size => {
+				self.interest.insert(EventSet::writable());
+				Ok(WriteStatus::Ongoing)
+			},
+			Ok(_) if (self.send_buf.position() as usize) == send_size => {
+				self.interest.remove(EventSet::writable());
+				Ok(WriteStatus::Complete)
+			},
+			Ok(_) => { panic!("Wrote past buffer");},
+			Err(e) => Err(e)
+		}
+	}
+
+    pub fn register(&mut self, event_loop: &mut EventLoop<Host>) -> io::Result<()> {
+        trace!(target: "net", "connection register; token={:?}", self.token);
+        self.interest.insert(EventSet::readable());
+        event_loop.register_opt(&self.socket, self.token, self.interest, PollOpt::edge() | PollOpt::oneshot()).or_else(|e| {
+            error!("Failed to reregister {:?}, {:?}", self.token, e);
+            Err(e)
+        })
+    }
+
+    pub fn reregister(&mut self, event_loop: &mut EventLoop<Host>) -> io::Result<()> {
+        trace!(target: "net", "connection reregister; token={:?}", self.token);
+        event_loop.reregister( &self.socket, self.token, self.interest, PollOpt::edge() | PollOpt::oneshot()).or_else(|e| {
+            error!("Failed to reregister {:?}, {:?}", self.token, e);
+            Err(e)
+        })
+    }
+}
+

src/network/handshake.rs

@@ -0,0 +1,145 @@
+use mio::*;
+use mio::tcp::*;
+use hash::*;
+use crypto::*;
+use crypto;
+use network::connection::{Connection, WriteStatus};
+use network::host::{NodeId, Host, HostInfo};
+use network::Error;
+
+#[derive(PartialEq, Eq)]
+enum HandshakeState {
+	New,
+	ReadingAuth,
+	WritingAuth,
+	ReadingAck,
+	WritingAck,
+	WritingHello,
+	ReadingHello,
+	StartSession,
+}
+
+pub struct Handshake {
+	pub id: NodeId,
+	pub connection: Connection,
+	state: HandshakeState,
+	idle_timeout: Option<Timeout>,
+	ecdhe: KeyPair,
+	nonce: H256,
+	remote_public: Public,
+	remote_nonce: H256
+}
+
+impl Handshake {
+	pub fn new(token: Token, id: &NodeId, socket: TcpStream, nonce: &H256) -> Result<Handshake, Error> {
+		Ok(Handshake {
+			id: id.clone(),
+			connection: Connection::new(token, socket),
+			state: HandshakeState::New,
+			idle_timeout: None,
+			ecdhe: try!(KeyPair::create()),
+			nonce: nonce.clone(),
+			remote_public: Public::new(),
+			remote_nonce: H256::new()
+		})
+	}
+
+	pub fn start(&mut self, host: &HostInfo, originated: bool) {
+		if originated {
+			self.write_auth(host);
+		} 
+		else {
+			self.read_auth();
+		};
+	}
+
+	pub fn done(&self) -> bool {
+		self.state == HandshakeState::StartSession
+	}
+
+	pub fn readable(&mut self, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<(), Error> {
+		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
+		Ok(())
+	}
+
+	pub fn writable(&mut self, event_loop: &mut EventLoop<Host>, host: &HostInfo) -> Result<(), Error> {
+		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
+		match self.state {
+			HandshakeState::WritingAuth => {
+				match (try!(self.connection.writable())) {
+					WriteStatus::Complete => { try!(self.read_ack()); },
+					_ => {}
+				};
+				try!(self.connection.reregister(event_loop));
+			},
+			HandshakeState::WritingAck => {
+				match (try!(self.connection.writable())) {
+					WriteStatus::Complete => { try!(self.read_hello()); },
+					_ => {}
+				};
+				try!(self.connection.reregister(event_loop));
+			},
+			HandshakeState::WritingHello => {
+				match (try!(self.connection.writable())) {
+					WriteStatus::Complete => { self.state = HandshakeState::StartSession; },
+					_ => { try!(self.connection.reregister(event_loop)); }
+				};
+			},
+			_ => { panic!("Unexpected state") }
+		}
+		Ok(())
+	}
+
+	pub fn register(&mut self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
+		self.idle_timeout.map(|t| event_loop.clear_timeout(t));
+        self.idle_timeout = event_loop.timeout_ms(self.connection.token, 1800).ok();
+		self.connection.register(event_loop);
+		Ok(())
+	}
+
+	fn read_auth(&mut self) -> Result<(), Error> {
+		Ok(())
+	}
+
+	fn read_ack(&mut self) -> Result<(), Error> {
+		Ok(())
+	}
+
+	fn read_hello(&mut self) -> Result<(), Error> {
+		Ok(())
+	}
+
+	fn write_auth(&mut self, host: &HostInfo) -> Result<(), Error> {
+		trace!(target:"net", "Sending auth to {:?}", self.connection.socket.peer_addr());
+		let mut data = [0u8; /*Signature::SIZE*/ 65 + /*H256::SIZE*/ 32 + /*Public::SIZE*/ 64 + /*H256::SIZE*/ 32 + 1]; //TODO: use associated constants
+		let len = data.len();
+		{
+			data[len - 1] = 0x0;
+			let (sig, rest) = data.split_at_mut(65);
+			let (hepubk, rest) = rest.split_at_mut(32);
+			let (mut pubk, rest) = rest.split_at_mut(64);
+			let (nonce, rest) = rest.split_at_mut(32);
+			
+			// E(remote-pubk, S(ecdhe-random, ecdh-shared-secret^nonce) || H(ecdhe-random-pubk) || pubk || nonce || 0x0)
+			let shared = try!(crypto::ecdh::agree(host.secret(), &self.id));
+			let signature = try!(crypto::ec::sign(self.ecdhe.secret(), &(&shared ^ &self.nonce))).copy_to(sig);
+			self.ecdhe.public().sha3_into(hepubk);
+			host.id().copy_to(&mut pubk);
+			self.nonce.copy_to(nonce);
+		}
+		let message = try!(crypto::ecies::encrypt(&self.id, &data));
+		self.connection.send(&message[..]);
+		self.state = HandshakeState::WritingAuth;
+		Ok(())
+	}
+
+	fn write_ack(&mut self) -> Result<(), Error> {
+		Ok(())
+	}
+
+	fn write_hello(&mut self) -> Result<(), Error> {
+		Ok(())
+	}
+
+
+}

src/network/host.rs

@@ -11,9 +11,11 @@ use mio::util::{Slab};
 use mio::tcp::*;
 use mio::udp::*;
 use hash::*;
-use bytes::*;
+use crypto::*;
 use time::Tm;
 use error::EthcoreError;
+use network::connection::Connection;
+use network::handshake::Handshake;
 
 const DEFAULT_PORT: u16 = 30303;
 
@@ -27,9 +29,7 @@ const IDEAL_PEERS:u32 = 10;
 const BUCKET_SIZE: u32 = 16;	    ///< Denoted by k in [Kademlia]. Number of nodes stored in each bucket.
 const ALPHA: usize = 3;				///< Denoted by \alpha in [Kademlia]. Number of concurrent FindNode requests.
 
-type NodeId = H512;
+pub type NodeId = H512;
-type PublicKey = H512;
-type SecretKey = H256;
 
 #[derive(Debug)]
 struct NetworkConfiguration {
@@ -47,7 +47,7 @@ impl NetworkConfiguration {
             public_address: SocketAddr::from_str("0.0.0.0:30303").unwrap(),
             no_nat: false,
             no_discovery: false,
-            pin: false
+            pin: false,
         }
     }
 }
@@ -164,45 +164,6 @@ impl NodeBucket {
     }
 }
 
-struct Connection {
-    socket: TcpStream,
-	send_queue: Vec<Bytes>,
-}
-
-impl Connection {
-	fn new(socket: TcpStream) -> Connection {
-		Connection {
-			socket: socket,
-			send_queue: Vec::new(),
-		}
-	}
-}
-
-#[derive(PartialEq, Eq)]
-enum HandshakeState {
-	New,
-	AckAuth,
-	WriteHello,
-	ReadHello,
-	StartSession,
-}
-
-struct Handshake {
-	id: NodeId,
-	connection: Connection,
-	state: HandshakeState,
-}
-
-impl Handshake {
-	fn new(id: NodeId, socket: TcpStream) -> Handshake {
-		Handshake {
-			id: id,
-			connection: Connection::new(socket),
-			state: HandshakeState::New
-		}
-	}
-}
-
 struct Peer {
 	id: NodeId,
 	connection: Connection,
@@ -214,7 +175,7 @@ impl FindNodePacket {
     fn new(_endpoint: &NodeEndpoint, _id: &NodeId) -> FindNodePacket {
         FindNodePacket
     }
-    fn sign(&mut self, _secret: &SecretKey) {
+    fn sign(&mut self, _secret: &Secret) {
     }
 
     fn send(& self, _socket: &mut UdpSocket) {
@@ -236,11 +197,29 @@ pub enum HostMessage {
     Shutdown
 }
 
-pub struct Host {
+pub struct HostInfo {
-    secret: SecretKey,
+    keys: KeyPair,
-    node: Node,
-    sender: Sender<HostMessage>,
     config: NetworkConfiguration,
+	nonce: H256
+}
+
+impl HostInfo {
+	pub fn id(&self) -> &NodeId {
+		self.keys.public()
+	}
+
+	pub fn secret(&self) -> &Secret {
+		self.keys.secret()
+	}
+	pub fn next_nonce(&mut self) -> H256 {
+		self.nonce = self.nonce.sha3();
+		return self.nonce.clone();
+	}
+}
+
+pub struct Host {
+	info: HostInfo,
+    sender: Sender<HostMessage>,
     udp_socket: UdpSocket,
     listener: TcpListener,
     peers: Slab<Peer>,
@@ -282,9 +261,11 @@ impl Host {
         event_loop.timeout_ms(Token(NODETABLE_MAINTAIN), 7200).unwrap();
 
         let mut host = Host {
-            secret: SecretKey::new(),
+			info: HostInfo { 
-            node: Node::new(NodeId::new(), config.public_address.clone(), PeerType::Required), 
+				keys: KeyPair::create().unwrap(),
 				config: config,
+				nonce: H256::random()
+			},
             sender: sender,
             udp_socket: udp_socket,
             listener: listener,
@@ -338,7 +319,7 @@ impl Host {
         }
         let mut tried_count = 0;
         {
-            let nearest = Host::nearest_node_entries(&self.node.id, &self.discovery_id, &self.node_buckets).into_iter();
+            let nearest = Host::nearest_node_entries(&self.info.id(), &self.discovery_id, &self.node_buckets).into_iter();
             let nodes = RefCell::new(&mut self.discovery_nodes);
             let nearest = nearest.filter(|x| nodes.borrow().contains(&x)).take(ALPHA);
             for r in nearest {
@@ -380,14 +361,14 @@ impl Host {
         ret
     }
 
-    fn nearest_node_entries<'a>(source: &NodeId, target: &NodeId, buckets: &'a Vec<NodeBucket>) -> Vec<&'a NodeId>
+    fn nearest_node_entries<'b>(source: &NodeId, target: &NodeId, buckets: &'b Vec<NodeBucket>) -> Vec<&'b NodeId>
     {
         // send ALPHA FindNode packets to nodes we know, closest to target
         const LAST_BIN: u32 = NODE_BINS - 1;
         let mut head = Host::distance(source, target);
         let mut tail = if head == 0  { LAST_BIN } else { (head - 1) % NODE_BINS };
 
-        let mut found: BTreeMap<u32, Vec<&'a NodeId>> = BTreeMap::new();
+        let mut found: BTreeMap<u32, Vec<&'b NodeId>> = BTreeMap::new();
         let mut count = 0;
 
         // if d is 0, then we roll look forward, if last, we reverse, else, spread from d
@@ -463,7 +444,6 @@ impl Host {
     }
 
     fn maintain_network(&mut self, event_loop: &mut EventLoop<Host>) {
-        self.keep_alive();
         self.connect_peers(event_loop);
     }
 
@@ -491,7 +471,7 @@ impl Host {
 			if connected && required {
 				req_conn += 1;
 			}
-			else if !connected && (!self.config.pin || required) {
+			else if !connected && (!self.info.config.pin || required) {
 				to_connect.push(n);
 			}
 		}
@@ -505,7 +485,7 @@ impl Host {
 			}
 		}
 		
-		if !self.config.pin
+		if !self.info.config.pin
 		{
 			let pending_count = 0; //TODO:
 			let peer_count = 0;
@@ -532,56 +512,88 @@ impl Host {
 			warn!("Aborted connect. Node already connecting.");
 			return;
 		}
+
+		let socket = {
 			let node = self.nodes.get_mut(id).unwrap();
 			node.last_attempted = Some(::time::now());
 			
 			
 			//blog(NetConnect) << "Attempting connection to node" << _p->id << "@" << ep << "from" << id();
-		let socket = match TcpStream::connect(&node.endpoint.address) {
+			match TcpStream::connect(&node.endpoint.address) {
 				Ok(socket) => socket,
 				Err(_) => {
 					warn!("Cannot connect to node");
 					return;
 				}
-		};
-		let handshake = Handshake::new(id.clone(), socket);
-		match self.connecting.insert(handshake) {
-			Ok(token) => event_loop.register_opt(&self.connecting[token].connection.socket, token, EventSet::all(), PollOpt::edge()).unwrap(),
-			Err(_) => warn!("Max connections reached")
-		};
 			}
+		};
 
-    fn keep_alive(&mut self) {
+		let nonce = self.info.next_nonce();
+		match self.connecting.insert_with(|token| Handshake::new(token, id, socket, &nonce).expect("Can't create handshake")) {
+			Some(token) => { 
+				self.connecting[token].register(event_loop).expect("Handshake token regisration failed"); 
+				self.connecting[token].start(&self.info, true);
+			},
+			None => { warn!("Max connections reached") }
+		}
 	}
-
 
 
 	fn accept(&mut self, _event_loop: &mut EventLoop<Host>) {
-		warn!(target "net", "accept");
+		warn!(target: "net", "accept");
 	}
 
-	fn start_handshake(&mut self, token: Token,  _event_loop: &mut EventLoop<Host>) {
+	fn handshake_writable(&mut self, token: Token, event_loop: &mut EventLoop<Host>) {
-		let handshake = match self.handshakes.get(&token) {
+		if !{
+			let handshake = match self.connecting.get_mut(token) {
 				Some(h) => h,
 				None => {
-				warn!(target "net", "Received event for unknown handshake");
+					warn!(target: "net", "Received event for unknown handshake");
 					return;
 				}
 			};
-
+			match handshake.writable(event_loop, &self.info) {
-
+				Err(e) => {
-
+					debug!(target: "net", "Handshake read error: {:?}", e);
-
+					false
+				},
+				Ok(_) => true
+			}
+		} {
+			self.kill_handshake(token, event_loop);
+		}
+	}
+	fn handshake_readable(&mut self, token: Token, event_loop: &mut EventLoop<Host>) {
+		if !{
+			let handshake = match self.connecting.get_mut(token) {
+				Some(h) => h,
+				None => {
+					warn!(target: "net", "Received event for unknown handshake");
+					return;
+				}
+			};
+			match handshake.writable(event_loop, &self.info) {
+				Err(e) => {
+					debug!(target: "net", "Handshake read error: {:?}", e);
+					false
+				},
+				Ok(_) => true
+			}
+		} {
+			self.kill_handshake(token, event_loop);
+		}
+	}
+	fn handshake_timeout(&mut self, token: Token, event_loop: &mut EventLoop<Host>) {
+		self.kill_handshake(token, event_loop)
+	}
+	fn kill_handshake(&mut self, token: Token, _event_loop: &mut EventLoop<Host>) {
+		self.connecting.remove(token);
 	}
 
-	fn read_handshake(&mut self, _event_loop: &mut EventLoop<Host>) {
+	fn read_connection(&mut self, _token: Token, _event_loop: &mut EventLoop<Host>) {
-				warn!(target "net", "accept");
 	}
 
-	fn read_connection(&mut self, _event_loop: &mut EventLoop<Host>) {
+	fn write_connection(&mut self, _token: Token, _event_loop: &mut EventLoop<Host>) {
-	}
-
-	fn write_connection(&mut self, _event_loop: &mut EventLoop<Host>) {
 	}
 }
 
@@ -594,16 +606,16 @@ impl Handler for Host {
 			match token.as_usize() {
 				TCP_ACCEPT =>  self.accept(event_loop),
 				IDLE => self.maintain_network(event_loop),
-				FIRST_CONNECTION ... LAST_CONNECTION => self.read_connection(event_loop),
+				FIRST_CONNECTION ... LAST_CONNECTION => self.read_connection(token, event_loop),
-				FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.read_handshake(event_loop),
+				FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.handshake_readable(token, event_loop),
 				NODETABLE_RECEIVE => {},
 				_ => panic!("Received unknown readable token"),
 			}
 		}
         else if events.is_writable() {
 			match token.as_usize() {
-				FIRST_CONNECTION ... LAST_CONNECTION => self.write_connection(event_loop),
+				FIRST_CONNECTION ... LAST_CONNECTION => self.write_connection(token, event_loop),
-				FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.start_handshake(event_loop),
+				FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.handshake_writable(token, event_loop),
 				_ => panic!("Received unknown writable token"),
 			}
 		}
@@ -612,6 +624,7 @@ impl Handler for Host {
 	fn timeout(&mut self, event_loop: &mut EventLoop<Host>, token: Token) {
 		match token.as_usize() {
 			IDLE => self.maintain_network(event_loop),
+			FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.handshake_timeout(token, event_loop),
 			NODETABLE_DISCOVERY => {},
 			NODETABLE_MAINTAIN => {},
 			_ => panic!("Received unknown timer token"),

src/network/mod.rs

@@ -1,2 +1,24 @@
 extern crate mio;
 pub mod host;
+pub mod connection;
+pub mod handshake;
+
+
+#[derive(Debug)]
+pub enum Error {
+	Crypto(::crypto::CryptoError),
+	Io(::std::io::Error),
+}
+
+impl From<::std::io::Error> for Error {
+	fn from(err: ::std::io::Error) -> Error {
+		Error::Io(err)
+	}
+}
+
+impl From<::crypto::CryptoError> for Error {
+	fn from(err: ::crypto::CryptoError) -> Error {
+		Error::Crypto(err)
+	}
+}
+

src/sha3.rs

@@ -5,6 +5,7 @@ use hash::{FixedHash, H256};
 
 pub trait Hashable {
 	fn sha3(&self) -> H256;
+	fn sha3_into(&self, dest: &mut [u8]);
 }
 
 impl<T> Hashable for T where T: BytesConvertable {
@@ -15,6 +16,9 @@ impl<T> Hashable for T where T: BytesConvertable {
 			ret
 		}
 	}
+	fn sha3_into(&self, dest: &mut [u8]) {
+		keccak_256(self.bytes(), dest);
+	}
 }
 
 #[test]