flake.lock

@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1681202837,
+        "lastModified": 1685518550,
-        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
+        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
+        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
         "type": "github"
       },
       "original": {
@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1684922889,
+        "lastModified": 1686921029,
-        "narHash": "sha256-l0WZAmln8959O7RdYUJ3gnAIM9OPKFLKHKGX4q+Blrk=",
+        "narHash": "sha256-J1bX9plPCFhTSh6E3TWn9XSxggBh/zDD4xigyaIQBy8=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "04aaf8511678a0d0f347fdf1e8072fe01e4a509e",
+        "rev": "c7ff1b9b95620ce8728c0d7bd501c458e6da9e04",
         "type": "github"
       },
       "original": {
@@ -54,11 +54,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1684844536,
+        "lastModified": 1686960236,
-        "narHash": "sha256-M7HhXYVqAuNb25r/d3FOO0z4GxPqDIZp5UjHFbBgw0Q=",
+        "narHash": "sha256-AYCC9rXNLpUWzD9hm+askOfpliLEC9kwAo7ITJc4HIw=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "d30264c2691128adc261d7c9388033645f0e742b",
+        "rev": "04af42f3b31dba0ef742d254456dc4c14eedac86",
         "type": "github"
       },
       "original": {
@@ -98,11 +98,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1684894917,
+        "lastModified": 1687055571,
-        "narHash": "sha256-kwKCfmliHIxKuIjnM95TRcQxM/4AAEIZ+4A9nDJ6cJs=",
+        "narHash": "sha256-UvLoO6u5n9TzY80BpM4DaacxvyJl7u9mm9CA72d309g=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "9ea38d547100edcf0da19aaebbdffa2810585495",
+        "rev": "2de557c780dcb127128ae987fca9d6c2b0d7dc0f",
         "type": "github"
       },
       "original": {

src/config/mod.rs

@@ -2,11 +2,10 @@
 //! Configuration to initialize the Fenrir networking library
 
 use crate::{
-    connection::handshake::HandshakeID,
+    connection::handshake,
     enc::{
         asym::{KeyExchangeKind, KeyID, PrivKey, PubKey},
-        hkdf::HkdfKind,
+        hkdf, sym,
-        sym::CipherKind,
     },
 };
 use ::std::{
@@ -44,13 +43,13 @@ pub struct Config {
     /// List of DNS resolvers to use
     pub resolvers: Vec<SocketAddr>,
     /// Supported handshakes
-    pub handshakes: Vec<HandshakeID>,
+    pub handshakes: Vec<handshake::ID>,
     /// Supported key exchanges
     pub key_exchanges: Vec<KeyExchangeKind>,
     /// Supported Hkdfs
-    pub hkdfs: Vec<HkdfKind>,
+    pub hkdfs: Vec<hkdf::Kind>,
     /// Supported Ciphers
-    pub ciphers: Vec<CipherKind>,
+    pub ciphers: Vec<sym::Kind>,
     /// list of authentication servers
     /// clients will have this empty
     pub servers: Vec<AuthServer>,
@@ -73,10 +72,10 @@ impl Default for Config {
                 ),
             ],
             resolvers: Vec::new(),
-            handshakes: [HandshakeID::DirectorySynchronized].to_vec(),
+            handshakes: [handshake::ID::DirectorySynchronized].to_vec(),
             key_exchanges: [KeyExchangeKind::X25519DiffieHellman].to_vec(),
-            hkdfs: [HkdfKind::Sha3].to_vec(),
+            hkdfs: [hkdf::Kind::Sha3].to_vec(),
-            ciphers: [CipherKind::XChaCha20Poly1305].to_vec(),
+            ciphers: [sym::Kind::XChaCha20Poly1305].to_vec(),
             servers: Vec::new(),
             server_keys: Vec::new(),
         }

src/connection/handshake/dirsync/mod.rs

@@ -0,0 +1,77 @@
+//! Directory synchronized handshake
+//! 1-RTT connection
+//!
+//! The simplest, fastest handshake supported by Fenrir
+//! Downside: It does not offer protection from DDos,
+//! no perfect forward secrecy
+//!
+//! To grant a form of perfect forward secrecy, the server should periodically
+//! change the DNSSEC public/private keys
+
+use crate::enc::{
+    sym::{NonceLen, TagLen},
+    Random,
+};
+
+pub mod req;
+pub mod resp;
+
+// TODO: merge with crate::enc::sym::Nonce
+/// random nonce
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Nonce(pub(crate) [u8; 16]);
+
+impl Nonce {
+    /// Create a new random Nonce
+    pub fn new(rnd: &Random) -> Self {
+        use ::core::mem::MaybeUninit;
+        let mut out: MaybeUninit<[u8; 16]>;
+        #[allow(unsafe_code)]
+        unsafe {
+            out = MaybeUninit::uninit();
+            let _ = rnd.fill(out.assume_init_mut());
+            Self(out.assume_init())
+        }
+    }
+    /// Length of the serialized Nonce
+    pub const fn len() -> usize {
+        16
+    }
+}
+impl From<&[u8; 16]> for Nonce {
+    fn from(raw: &[u8; 16]) -> Self {
+        Self(raw.clone())
+    }
+}
+
+/// Parsed handshake
+#[derive(Debug, Clone, PartialEq)]
+pub enum DirSync {
+    /// Directory synchronized handshake: client request
+    Req(req::Req),
+    /// Directory synchronized handshake: server response
+    Resp(resp::Resp),
+}
+
+impl DirSync {
+    /// actual length of the dirsync handshake data
+    pub fn len(&self, head_len: NonceLen, tag_len: TagLen) -> usize {
+        match self {
+            DirSync::Req(req) => req.len(),
+            DirSync::Resp(resp) => resp.len(head_len, tag_len),
+        }
+    }
+    /// Serialize into raw bytes
+    /// NOTE: assumes that there is exactly asa much buffer as needed
+    pub fn serialize(
+        &self,
+        head_len: NonceLen,
+        tag_len: TagLen,
+        out: &mut [u8],
+    ) {
+        match self {
+            DirSync::Req(req) => req.serialize(head_len, tag_len, out),
+            DirSync::Resp(resp) => resp.serialize(head_len, tag_len, out),
+        }
+    }
+}

src/connection/handshake/dirsync/req.rs

@@ -1,85 +1,22 @@
-//! Directory synchronized handshake
+//! Directory synchronized handshake, Request parsing
-//! 1-RTT connection
-//!
-//! The simplest, fastest handshake supported by Fenrir
-//! Downside: It does not offer protection from DDos,
-//! no perfect forward secrecy
-//!
-//! To grant a form of perfect forward secrecy, the server should periodically
-//! change the DNSSEC public/private keys
 
-use super::{Error, HandshakeData};
 use crate::{
     auth,
-    connection::{ProtocolVersion, ID},
+    connection::{
+        handshake::{
+            self,
+            dirsync::{DirSync, Nonce},
+            Error,
+        },
+        ProtocolVersion, ID,
+    },
     enc::{
         asym::{ExchangePubKey, KeyExchangeKind, KeyID},
-        hkdf::HkdfKind,
+        hkdf,
-        sym::{CipherKind, HeadLen, TagLen},
+        sym::{self, NonceLen, TagLen},
-        Random, Secret,
     },
 };
 
-// TODO: merge with crate::enc::sym::Nonce
-/// random nonce
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub struct Nonce(pub(crate) [u8; 16]);
-
-impl Nonce {
-    /// Create a new random Nonce
-    pub fn new(rnd: &Random) -> Self {
-        use ::core::mem::MaybeUninit;
-        let mut out: MaybeUninit<[u8; 16]>;
-        #[allow(unsafe_code)]
-        unsafe {
-            out = MaybeUninit::uninit();
-            let _ = rnd.fill(out.assume_init_mut());
-            Self(out.assume_init())
-        }
-    }
-    /// Length of the serialized Nonce
-    pub const fn len() -> usize {
-        16
-    }
-}
-impl From<&[u8; 16]> for Nonce {
-    fn from(raw: &[u8; 16]) -> Self {
-        Self(raw.clone())
-    }
-}
-
-/// Parsed handshake
-#[derive(Debug, Clone, PartialEq)]
-pub enum DirSync {
-    /// Directory synchronized handshake: client request
-    Req(Req),
-    /// Directory synchronized handshake: server response
-    Resp(Resp),
-}
-
-impl DirSync {
-    /// actual length of the dirsync handshake data
-    pub fn len(&self, head_len: HeadLen, tag_len: TagLen) -> usize {
-        match self {
-            DirSync::Req(req) => req.len(),
-            DirSync::Resp(resp) => resp.len(head_len, tag_len),
-        }
-    }
-    /// Serialize into raw bytes
-    /// NOTE: assumes that there is exactly asa much buffer as needed
-    pub fn serialize(
-        &self,
-        head_len: HeadLen,
-        tag_len: TagLen,
-        out: &mut [u8],
-    ) {
-        match self {
-            DirSync::Req(req) => req.serialize(head_len, tag_len, out),
-            DirSync::Resp(resp) => resp.serialize(head_len, tag_len, out),
-        }
-    }
-}
-
 /// Client request of a directory synchronized handshake
 #[derive(Debug, Clone, PartialEq)]
 pub struct Req {
@@ -88,13 +25,13 @@ pub struct Req {
     /// Selected key exchange
     pub exchange: KeyExchangeKind,
     /// Selected hkdf
-    pub hkdf: HkdfKind,
+    pub hkdf: hkdf::Kind,
     /// Selected cipher
-    pub cipher: CipherKind,
+    pub cipher: sym::Kind,
     /// Client ephemeral public key used for key exchanges
     pub exchange_key: ExchangePubKey,
     /// encrypted data
-    pub data: ReqInner,
+    pub data: State,
     // SECURITY: TODO: Add padding to min: 1200 bytes
     //   to avoid amplification attaks
     //   also: 1200 < 1280 to allow better vpn compatibility
@@ -105,30 +42,30 @@ impl Req {
     /// NOTE: starts from the beginning of the fenrir packet
     pub fn encrypted_offset(&self) -> usize {
         ProtocolVersion::len()
-            + crate::handshake::HandshakeID::len()
+            + handshake::ID::len()
             + KeyID::len()
             + KeyExchangeKind::len()
-            + HkdfKind::len()
+            + hkdf::Kind::len()
-            + CipherKind::len()
+            + sym::Kind::len()
             + self.exchange_key.kind().pub_len()
     }
     /// return the total length of the cleartext data
     pub fn encrypted_length(
         &self,
-        head_len: HeadLen,
+        head_len: NonceLen,
         tag_len: TagLen,
     ) -> usize {
         match &self.data {
-            ReqInner::ClearText(data) => data.len() + head_len.0 + tag_len.0,
+            State::ClearText(data) => data.len() + head_len.0 + tag_len.0,
-            ReqInner::CipherText(length) => *length,
+            State::CipherText(length) => *length,
         }
     }
     /// actual length of the directory synchronized request
     pub fn len(&self) -> usize {
         KeyID::len()
             + KeyExchangeKind::len()
-            + HkdfKind::len()
+            + hkdf::Kind::len()
-            + CipherKind::len()
+            + sym::Kind::len()
             + self.exchange_key.kind().pub_len()
             + self.cipher.nonce_len().0
             + self.data.len()
@@ -138,7 +75,7 @@ impl Req {
     /// NOTE: assumes that there is exactly as much buffer as needed
     pub fn serialize(
         &self,
-        head_len: HeadLen,
+        head_len: NonceLen,
         tag_len: TagLen,
         out: &mut [u8],
     ) {
@@ -150,7 +87,7 @@ impl Req {
         let written_next = 5 + key_len;
         self.exchange_key.serialize_into(&mut out[5..written_next]);
         let written = written_next;
-        if let ReqInner::ClearText(data) = &self.data {
+        if let State::ClearText(data) = &self.data {
             let from = written + head_len.0;
             let to = out.len() - tag_len.0;
             data.serialize(&mut out[from..to]);
@@ -160,8 +97,8 @@ impl Req {
     }
 }
 
-impl super::HandshakeParsing for Req {
+impl handshake::Parsing for Req {
-    fn deserialize(raw: &[u8]) -> Result<HandshakeData, Error> {
+    fn deserialize(raw: &[u8]) -> Result<handshake::Data, Error> {
         const MIN_PKT_LEN: usize = 10;
         if raw.len() < MIN_PKT_LEN {
             return Err(Error::NotEnoughData);
@@ -173,25 +110,25 @@ impl super::HandshakeParsing for Req {
             Some(exchange) => exchange,
             None => return Err(Error::Parsing),
         };
-        let hkdf: HkdfKind = match HkdfKind::from_u8(raw[3]) {
+        let hkdf: hkdf::Kind = match hkdf::Kind::from_u8(raw[3]) {
             Some(exchange) => exchange,
             None => return Err(Error::Parsing),
         };
-        let cipher: CipherKind = match CipherKind::from_u8(raw[4]) {
+        let cipher: sym::Kind = match sym::Kind::from_u8(raw[4]) {
             Some(cipher) => cipher,
             None => return Err(Error::Parsing),
         };
         const CURR_SIZE: usize = KeyID::len()
             + KeyExchangeKind::len()
-            + HkdfKind::len()
+            + hkdf::Kind::len()
-            + CipherKind::len();
+            + sym::Kind::len();
         let (exchange_key, len) =
             match ExchangePubKey::deserialize(&raw[CURR_SIZE..]) {
                 Ok(exchange_key) => exchange_key,
                 Err(e) => return Err(e.into()),
             };
-        let data = ReqInner::CipherText(raw.len() - (CURR_SIZE + len));
+        let data = State::CipherText(raw.len() - (CURR_SIZE + len));
-        Ok(HandshakeData::DirSync(DirSync::Req(Self {
+        Ok(handshake::Data::DirSync(DirSync::Req(Self {
             key_id,
             exchange,
             hkdf,
@@ -204,18 +141,18 @@ impl super::HandshakeParsing for Req {
 
 /// Quick way to avoid mixing cipher and clear text
 #[derive(Debug, Clone, PartialEq)]
-pub enum ReqInner {
+pub enum State {
     /// Data is still encrytped, we only keep the length
     CipherText(usize),
     /// Client data, decrypted and parsed
-    ClearText(ReqData),
+    ClearText(Data),
 }
-impl ReqInner {
+impl State {
     /// The length of the data
     pub fn len(&self) -> usize {
         match self {
-            ReqInner::CipherText(len) => *len,
+            State::CipherText(len) => *len,
-            ReqInner::ClearText(data) => data.len(),
+            State::ClearText(data) => data.len(),
         }
     }
     /// parse the cleartext
@@ -224,19 +161,19 @@ impl ReqInner {
         raw: &[u8],
     ) -> Result<(), Error> {
         let clear = match self {
-            ReqInner::CipherText(len) => {
+            State::CipherText(len) => {
                 assert!(
                     *len > raw.len(),
-                    "DirSync::ReqInner::CipherText length mismatch"
+                    "DirSync::State::CipherText length mismatch"
                 );
-                match ReqData::deserialize(raw) {
+                match Data::deserialize(raw) {
                     Ok(clear) => clear,
                     Err(e) => return Err(e),
                 }
             }
             _ => return Err(Error::Parsing),
         };
-        *self = ReqInner::ClearText(clear);
+        *self = State::ClearText(clear);
         Ok(())
     }
 }
@@ -321,7 +258,7 @@ impl AuthInfo {
 
 /// Decrypted request data
 #[derive(Debug, Clone, PartialEq)]
-pub struct ReqData {
+pub struct Data {
     /// Random nonce, the client can use this to track multiple key exchanges
     pub nonce: Nonce,
     /// Client key id so the client can use and rotate keys
@@ -331,7 +268,7 @@ pub struct ReqData {
     /// Authentication data
     pub auth: AuthInfo,
 }
-impl ReqData {
+impl Data {
     /// actual length of the request data
     pub fn len(&self) -> usize {
         Nonce::len() + KeyID::len() + ID::len() + self.auth.len()
@@ -383,179 +320,3 @@ impl ReqData {
         })
     }
 }
-
-/// Quick way to avoid mixing cipher and clear text
-#[derive(Debug, Clone, PartialEq)]
-pub enum RespInner {
-    /// Server data, still in ciphertext
-    CipherText(usize),
-    /// Parsed, cleartext server data
-    ClearText(RespData),
-}
-impl RespInner {
-    /// The length of the data
-    pub fn len(&self) -> usize {
-        match self {
-            RespInner::CipherText(len) => *len,
-            RespInner::ClearText(_) => RespData::len(),
-        }
-    }
-    /// parse the cleartext
-    pub fn deserialize_as_cleartext(
-        &mut self,
-        raw: &[u8],
-    ) -> Result<(), Error> {
-        let clear = match self {
-            RespInner::CipherText(len) => {
-                assert!(
-                    *len > raw.len(),
-                    "DirSync::RespInner::CipherText length mismatch"
-                );
-                match RespData::deserialize(raw) {
-                    Ok(clear) => clear,
-                    Err(e) => return Err(e),
-                }
-            }
-            _ => return Err(Error::Parsing),
-        };
-        *self = RespInner::ClearText(clear);
-        Ok(())
-    }
-    /// Serialize the still cleartext data
-    pub fn serialize(&self, out: &mut [u8]) {
-        if let RespInner::ClearText(clear) = &self {
-            clear.serialize(out);
-        }
-    }
-}
-
-/// Server response in a directory synchronized handshake
-#[derive(Debug, Clone, PartialEq)]
-pub struct Resp {
-    /// Tells the client with which key the exchange was done
-    pub client_key_id: KeyID,
-    /// actual response data, might be encrypted
-    pub data: RespInner,
-}
-
-impl super::HandshakeParsing for Resp {
-    fn deserialize(raw: &[u8]) -> Result<HandshakeData, Error> {
-        const MIN_PKT_LEN: usize = 68;
-        if raw.len() < MIN_PKT_LEN {
-            return Err(Error::NotEnoughData);
-        }
-        let client_key_id: KeyID =
-            KeyID(u16::from_le_bytes(raw[0..KeyID::len()].try_into().unwrap()));
-        Ok(HandshakeData::DirSync(DirSync::Resp(Self {
-            client_key_id,
-            data: RespInner::CipherText(raw[KeyID::len()..].len()),
-        })))
-    }
-}
-
-impl Resp {
-    /// return the offset of the encrypted data
-    /// NOTE: starts from the beginning of the fenrir packet
-    pub fn encrypted_offset(&self) -> usize {
-        ProtocolVersion::len()
-            + crate::connection::handshake::HandshakeID::len()
-            + KeyID::len()
-    }
-    /// return the total length of the cleartext data
-    pub fn encrypted_length(
-        &self,
-        head_len: HeadLen,
-        tag_len: TagLen,
-    ) -> usize {
-        match &self.data {
-            RespInner::ClearText(_data) => {
-                RespData::len() + head_len.0 + tag_len.0
-            }
-            RespInner::CipherText(len) => *len,
-        }
-    }
-    /// Total length of the response handshake
-    pub fn len(&self, head_len: HeadLen, tag_len: TagLen) -> usize {
-        KeyID::len() + head_len.0 + self.data.len() + tag_len.0
-    }
-    /// Serialize into raw bytes
-    /// NOTE: assumes that there is exactly as much buffer as needed
-    pub fn serialize(
-        &self,
-        head_len: HeadLen,
-        _tag_len: TagLen,
-        out: &mut [u8],
-    ) {
-        out[0..KeyID::len()]
-            .copy_from_slice(&self.client_key_id.0.to_le_bytes());
-        let start_data = KeyID::len() + head_len.0;
-        let end_data = start_data + self.data.len();
-        self.data.serialize(&mut out[start_data..end_data]);
-    }
-}
-
-/// Decrypted response data
-#[derive(Debug, Clone, PartialEq)]
-pub struct RespData {
-    /// Client nonce, copied from the request
-    pub client_nonce: Nonce,
-    /// Server Connection ID
-    pub id: ID,
-    /// Service Connection ID
-    pub service_connection_id: ID,
-    /// Service encryption key
-    pub service_key: Secret,
-}
-
-impl RespData {
-    /// Return the expected length for buffer allocation
-    pub fn len() -> usize {
-        Nonce::len() + ID::len() + ID::len() + Secret::len()
-    }
-    /// Serialize the data into a buffer
-    /// NOTE: assumes that there is exactly asa much buffer as needed
-    pub fn serialize(&self, out: &mut [u8]) {
-        let mut start = 0;
-        let mut end = Nonce::len();
-        out[start..end].copy_from_slice(&self.client_nonce.0);
-        start = end;
-        end = end + ID::len();
-        self.id.serialize(&mut out[start..end]);
-        start = end;
-        end = end + ID::len();
-        self.service_connection_id.serialize(&mut out[start..end]);
-        start = end;
-        end = end + Secret::len();
-        out[start..end].copy_from_slice(self.service_key.as_ref());
-    }
-    /// Parse the cleartext raw data
-    pub fn deserialize(raw: &[u8]) -> Result<Self, Error> {
-        let raw_sized: &[u8; 16] = raw[..Nonce::len()].try_into().unwrap();
-        let client_nonce: Nonce = raw_sized.into();
-        let end = Nonce::len() + ID::len();
-        let id: ID =
-            u64::from_le_bytes(raw[Nonce::len()..end].try_into().unwrap())
-                .into();
-        if id.is_handshake() {
-            return Err(Error::Parsing);
-        }
-        let parsed = end;
-        let end = parsed + ID::len();
-        let service_connection_id: ID =
-            u64::from_le_bytes(raw[parsed..end].try_into().unwrap()).into();
-        if service_connection_id.is_handshake() {
-            return Err(Error::Parsing);
-        }
-        let parsed = end;
-        let end = parsed + Secret::len();
-        let raw_secret: &[u8; 32] = raw[parsed..end].try_into().unwrap();
-        let service_key = raw_secret.into();
-
-        Ok(Self {
-            client_nonce,
-            id,
-            service_connection_id,
-            service_key,
-        })
-    }
-}

src/connection/handshake/dirsync/resp.rs

@@ -0,0 +1,189 @@
+//! Directory synchronized handshake, Response parsing
+
+use crate::{
+    connection::{
+        handshake::{
+            self,
+            dirsync::{DirSync, Nonce},
+            Error,
+        },
+        ProtocolVersion, ID,
+    },
+    enc::{
+        asym::KeyID,
+        sym::{NonceLen, TagLen},
+        Secret,
+    },
+};
+
+/// Server response in a directory synchronized handshake
+#[derive(Debug, Clone, PartialEq)]
+pub struct Resp {
+    /// Tells the client with which key the exchange was done
+    pub client_key_id: KeyID,
+    /// actual response data, might be encrypted
+    pub data: State,
+}
+
+impl handshake::Parsing for Resp {
+    fn deserialize(raw: &[u8]) -> Result<handshake::Data, Error> {
+        const MIN_PKT_LEN: usize = 68;
+        if raw.len() < MIN_PKT_LEN {
+            return Err(Error::NotEnoughData);
+        }
+        let client_key_id: KeyID =
+            KeyID(u16::from_le_bytes(raw[0..KeyID::len()].try_into().unwrap()));
+        Ok(handshake::Data::DirSync(DirSync::Resp(Self {
+            client_key_id,
+            data: State::CipherText(raw[KeyID::len()..].len()),
+        })))
+    }
+}
+
+impl Resp {
+    /// return the offset of the encrypted data
+    /// NOTE: starts from the beginning of the fenrir packet
+    pub fn encrypted_offset(&self) -> usize {
+        ProtocolVersion::len() + handshake::ID::len() + KeyID::len()
+    }
+    /// return the total length of the cleartext data
+    pub fn encrypted_length(
+        &self,
+        head_len: NonceLen,
+        tag_len: TagLen,
+    ) -> usize {
+        match &self.data {
+            State::ClearText(_data) => Data::len() + head_len.0 + tag_len.0,
+            State::CipherText(len) => *len,
+        }
+    }
+    /// Total length of the response handshake
+    pub fn len(&self, head_len: NonceLen, tag_len: TagLen) -> usize {
+        KeyID::len() + head_len.0 + self.data.len() + tag_len.0
+    }
+    /// Serialize into raw bytes
+    /// NOTE: assumes that there is exactly as much buffer as needed
+    pub fn serialize(
+        &self,
+        head_len: NonceLen,
+        _tag_len: TagLen,
+        out: &mut [u8],
+    ) {
+        out[0..KeyID::len()]
+            .copy_from_slice(&self.client_key_id.0.to_le_bytes());
+        let start_data = KeyID::len() + head_len.0;
+        let end_data = start_data + self.data.len();
+        self.data.serialize(&mut out[start_data..end_data]);
+    }
+}
+
+/// Quick way to avoid mixing cipher and clear text
+#[derive(Debug, Clone, PartialEq)]
+pub enum State {
+    /// Server data, still in ciphertext
+    CipherText(usize),
+    /// Parsed, cleartext server data
+    ClearText(Data),
+}
+impl State {
+    /// The length of the data
+    pub fn len(&self) -> usize {
+        match self {
+            State::CipherText(len) => *len,
+            State::ClearText(_) => Data::len(),
+        }
+    }
+    /// parse the cleartext
+    pub fn deserialize_as_cleartext(
+        &mut self,
+        raw: &[u8],
+    ) -> Result<(), Error> {
+        let clear = match self {
+            State::CipherText(len) => {
+                assert!(
+                    *len > raw.len(),
+                    "DirSync::State::CipherText length mismatch"
+                );
+                match Data::deserialize(raw) {
+                    Ok(clear) => clear,
+                    Err(e) => return Err(e),
+                }
+            }
+            _ => return Err(Error::Parsing),
+        };
+        *self = State::ClearText(clear);
+        Ok(())
+    }
+    /// Serialize the still cleartext data
+    pub fn serialize(&self, out: &mut [u8]) {
+        if let State::ClearText(clear) = &self {
+            clear.serialize(out);
+        }
+    }
+}
+
+/// Decrypted response data
+#[derive(Debug, Clone, PartialEq)]
+pub struct Data {
+    /// Client nonce, copied from the request
+    pub client_nonce: Nonce,
+    /// Server Connection ID
+    pub id: ID,
+    /// Service Connection ID
+    pub service_connection_id: ID,
+    /// Service encryption key
+    pub service_key: Secret,
+}
+
+impl Data {
+    /// Return the expected length for buffer allocation
+    pub fn len() -> usize {
+        Nonce::len() + ID::len() + ID::len() + Secret::len()
+    }
+    /// Serialize the data into a buffer
+    /// NOTE: assumes that there is exactly asa much buffer as needed
+    pub fn serialize(&self, out: &mut [u8]) {
+        let mut start = 0;
+        let mut end = Nonce::len();
+        out[start..end].copy_from_slice(&self.client_nonce.0);
+        start = end;
+        end = end + ID::len();
+        self.id.serialize(&mut out[start..end]);
+        start = end;
+        end = end + ID::len();
+        self.service_connection_id.serialize(&mut out[start..end]);
+        start = end;
+        end = end + Secret::len();
+        out[start..end].copy_from_slice(self.service_key.as_ref());
+    }
+    /// Parse the cleartext raw data
+    pub fn deserialize(raw: &[u8]) -> Result<Self, Error> {
+        let raw_sized: &[u8; 16] = raw[..Nonce::len()].try_into().unwrap();
+        let client_nonce: Nonce = raw_sized.into();
+        let end = Nonce::len() + ID::len();
+        let id: ID =
+            u64::from_le_bytes(raw[Nonce::len()..end].try_into().unwrap())
+                .into();
+        if id.is_handshake() {
+            return Err(Error::Parsing);
+        }
+        let parsed = end;
+        let end = parsed + ID::len();
+        let service_connection_id: ID =
+            u64::from_le_bytes(raw[parsed..end].try_into().unwrap()).into();
+        if service_connection_id.is_handshake() {
+            return Err(Error::Parsing);
+        }
+        let parsed = end;
+        let end = parsed + Secret::len();
+        let raw_secret: &[u8; 32] = raw[parsed..end].try_into().unwrap();
+        let service_key = raw_secret.into();
+
+        Ok(Self {
+            client_nonce,
+            id,
+            service_connection_id,
+            service_key,
+        })
+    }
+}

src/connection/handshake/mod.rs

@@ -4,10 +4,11 @@ pub mod dirsync;
 #[cfg(test)]
 mod tests;
 pub(crate) mod tracker;
+pub(crate) use tracker::{Action, Tracker};
 
 use crate::{
     connection::ProtocolVersion,
-    enc::sym::{HeadLen, TagLen},
+    enc::sym::{NonceLen, TagLen},
 };
 use ::num_traits::FromPrimitive;
 
@@ -56,7 +57,7 @@ pub enum Error {
     ::strum_macros::IntoStaticStr,
 )]
 #[repr(u8)]
-pub enum HandshakeID {
+pub enum ID {
     /// 1-RTT Directory synchronized handshake. Fast, no forward secrecy
     #[strum(serialize = "directory_synchronized")]
     DirectorySynchronized = 0,
@@ -67,7 +68,7 @@ pub enum HandshakeID {
     #[strum(serialize = "stateless")]
     Stateless,
 }
-impl HandshakeID {
+impl ID {
     /// The length of the serialized field
     pub const fn len() -> usize {
         1
@@ -75,28 +76,28 @@ impl HandshakeID {
 }
 /// Parsed handshake
 #[derive(Debug, Clone, PartialEq)]
-pub enum HandshakeData {
+pub enum Data {
     /// Directory synchronized handhsake
     DirSync(dirsync::DirSync),
 }
 
-impl HandshakeData {
+impl Data {
     /// actual length of the handshake data
-    pub fn len(&self, head_len: HeadLen, tag_len: TagLen) -> usize {
+    pub fn len(&self, head_len: NonceLen, tag_len: TagLen) -> usize {
         match self {
-            HandshakeData::DirSync(d) => d.len(head_len, tag_len),
+            Data::DirSync(d) => d.len(head_len, tag_len),
         }
     }
     /// Serialize into raw bytes
     /// NOTE: assumes that there is exactly asa much buffer as needed
     pub fn serialize(
         &self,
-        head_len: HeadLen,
+        head_len: NonceLen,
         tag_len: TagLen,
         out: &mut [u8],
     ) {
         match self {
-            HandshakeData::DirSync(d) => d.serialize(head_len, tag_len, out),
+            Data::DirSync(d) => d.serialize(head_len, tag_len, out),
         }
     }
 }
@@ -133,19 +134,19 @@ pub struct Handshake {
     /// Fenrir Protocol version
     pub fenrir_version: ProtocolVersion,
     /// enum for the parsed data
-    pub data: HandshakeData,
+    pub data: Data,
 }
 
 impl Handshake {
     /// Build new handshake from the data
-    pub fn new(data: HandshakeData) -> Self {
+    pub fn new(data: Data) -> Self {
         Handshake {
             fenrir_version: ProtocolVersion::V0,
             data,
         }
     }
     /// return the total length of the handshake
-    pub fn len(&self, head_len: HeadLen, tag_len: TagLen) -> usize {
+    pub fn len(&self, head_len: NonceLen, tag_len: TagLen) -> usize {
         ProtocolVersion::len()
             + HandshakeKind::len()
             + self.data.len(head_len, tag_len)
@@ -165,9 +166,11 @@ impl Handshake {
             None => return Err(Error::Parsing),
         };
         let data = match handshake_kind {
-            HandshakeKind::DirSyncReq => dirsync::Req::deserialize(&raw[2..])?,
+            HandshakeKind::DirSyncReq => {
+                dirsync::req::Req::deserialize(&raw[2..])?
+            }
             HandshakeKind::DirSyncResp => {
-                dirsync::Resp::deserialize(&raw[2..])?
+                dirsync::resp::Resp::deserialize(&raw[2..])?
             }
         };
         Ok(Self {
@@ -179,13 +182,13 @@ impl Handshake {
     /// NOTE: assumes that there is exactly as much buffer as needed
     pub fn serialize(
         &self,
-        head_len: HeadLen,
+        head_len: NonceLen,
         tag_len: TagLen,
         out: &mut [u8],
     ) {
         out[0] = self.fenrir_version as u8;
         out[1] = match &self.data {
-            HandshakeData::DirSync(d) => match d {
+            Data::DirSync(d) => match d {
                 dirsync::DirSync::Req(_) => HandshakeKind::DirSyncReq,
                 dirsync::DirSync::Resp(_) => HandshakeKind::DirSyncResp,
             },
@@ -194,6 +197,6 @@ impl Handshake {
     }
 }
 
-trait HandshakeParsing {
+trait Parsing {
-    fn deserialize(raw: &[u8]) -> Result<HandshakeData, Error>;
+    fn deserialize(raw: &[u8]) -> Result<Data, Error>;
 }

src/connection/handshake/tests.rs

@@ -1,13 +1,16 @@
 use crate::{
     auth,
-    connection::{handshake::*, ID},
+    connection::{
+        handshake::{self, dirsync, Handshake},
+        ID,
+    },
     enc::{self, asym::KeyID},
 };
 
 #[test]
 fn test_handshake_dirsync_req() {
     let rand = enc::Random::new();
-    let cipher = enc::sym::CipherKind::XChaCha20Poly1305;
+    let cipher = enc::sym::Kind::XChaCha20Poly1305;
 
     let (_, exchange_key) =
         match enc::asym::KeyExchangeKind::X25519DiffieHellman.new_keypair(&rand)
@@ -19,11 +22,11 @@ fn test_handshake_dirsync_req() {
             }
         };
 
-    let data = dirsync::ReqInner::ClearText(dirsync::ReqData {
+    let data = dirsync::req::State::ClearText(dirsync::req::Data {
         nonce: dirsync::Nonce::new(&rand),
         client_key_id: KeyID(2424),
         id: ID::ID(::core::num::NonZeroU64::new(424242).unwrap()),
-        auth: dirsync::AuthInfo {
+        auth: dirsync::req::AuthInfo {
             user: auth::UserID::new(&rand),
             token: auth::Token::new_anonymous(&rand),
             service_id: auth::SERVICEID_AUTH,
@@ -31,16 +34,16 @@ fn test_handshake_dirsync_req() {
         },
     });
 
-    let h_req = Handshake::new(HandshakeData::DirSync(dirsync::DirSync::Req(
+    let h_req = Handshake::new(handshake::Data::DirSync(
-        dirsync::Req {
+        dirsync::DirSync::Req(dirsync::req::Req {
             key_id: KeyID(4224),
             exchange: enc::asym::KeyExchangeKind::X25519DiffieHellman,
-            hkdf: enc::hkdf::HkdfKind::Sha3,
+            hkdf: enc::hkdf::Kind::Sha3,
-            cipher: enc::sym::CipherKind::XChaCha20Poly1305,
+            cipher: enc::sym::Kind::XChaCha20Poly1305,
             exchange_key,
             data,
-        },
+        }),
-    )));
+    ));
 
     let mut bytes = Vec::<u8>::with_capacity(
         h_req.len(cipher.nonce_len(), cipher.tag_len()),
@@ -55,7 +58,7 @@ fn test_handshake_dirsync_req() {
             return;
         }
     };
-    if let HandshakeData::DirSync(dirsync::DirSync::Req(r_a)) =
+    if let handshake::Data::DirSync(dirsync::DirSync::Req(r_a)) =
         &mut deserialized.data
     {
         let enc_start = r_a.encrypted_offset() + cipher.nonce_len().0;
@@ -74,11 +77,11 @@ fn test_handshake_dirsync_req() {
 #[test]
 fn test_handshake_dirsync_reqsp() {
     let rand = enc::Random::new();
-    let cipher = enc::sym::CipherKind::XChaCha20Poly1305;
+    let cipher = enc::sym::Kind::XChaCha20Poly1305;
 
     let service_key = enc::Secret::new_rand(&rand);
 
-    let data = dirsync::RespInner::ClearText(dirsync::RespData {
+    let data = dirsync::resp::State::ClearText(dirsync::resp::Data {
         client_nonce: dirsync::Nonce::new(&rand),
         id: ID::ID(::core::num::NonZeroU64::new(424242).unwrap()),
         service_connection_id: ID::ID(
@@ -87,8 +90,8 @@ fn test_handshake_dirsync_reqsp() {
         service_key,
     });
 
-    let h_resp = Handshake::new(HandshakeData::DirSync(
+    let h_resp = Handshake::new(handshake::Data::DirSync(
-        dirsync::DirSync::Resp(dirsync::Resp {
+        dirsync::DirSync::Resp(dirsync::resp::Resp {
             client_key_id: KeyID(4444),
             data,
         }),
@@ -107,7 +110,7 @@ fn test_handshake_dirsync_reqsp() {
             return;
         }
     };
-    if let HandshakeData::DirSync(dirsync::DirSync::Resp(r_a)) =
+    if let handshake::Data::DirSync(dirsync::DirSync::Resp(r_a)) =
         &mut deserialized.data
     {
         let enc_start = r_a.encrypted_offset() + cipher.nonce_len().0;

src/connection/handshake/tracker.rs

@@ -3,22 +3,21 @@
 use crate::{
     auth::{Domain, ServiceID},
     connection::{
-        self,
         handshake::{self, Error, Handshake},
-        Connection, IDRecv, IDSend,
+        Conn, IDRecv, IDSend,
     },
     enc::{
         self,
         asym::{self, KeyID, PrivKey, PubKey},
-        hkdf::{Hkdf, HkdfKind},
+        hkdf::{self, Hkdf},
-        sym::{CipherKind, CipherRecv},
+        sym::{self, CipherRecv},
     },
     inner::ThreadTracker,
 };
 
 use ::tokio::sync::oneshot;
 
-pub(crate) struct HandshakeServer {
+pub(crate) struct Server {
     pub id: KeyID,
     pub key: PrivKey,
     pub domains: Vec<Domain>,
@@ -26,10 +25,10 @@ pub(crate) struct HandshakeServer {
 
 pub(crate) type ConnectAnswer = Result<(KeyID, IDSend), crate::Error>;
 
-pub(crate) struct HandshakeClient {
+pub(crate) struct Client {
     pub service_id: ServiceID,
     pub service_conn_id: IDRecv,
-    pub connection: Connection,
+    pub connection: Conn,
     pub timeout: Option<::tokio::task::JoinHandle<()>>,
     pub answer: oneshot::Sender<ConnectAnswer>,
     pub srv_key_id: KeyID,
@@ -37,13 +36,13 @@ pub(crate) struct HandshakeClient {
 
 /// Tracks the keys used by the client and the handshake
 /// they are associated with
-pub(crate) struct HandshakeClientList {
+pub(crate) struct ClientList {
     used: Vec<::bitmaps::Bitmap<1024>>, // index = KeyID
     keys: Vec<Option<(PrivKey, PubKey)>>,
-    list: Vec<Option<HandshakeClient>>,
+    list: Vec<Option<Client>>,
 }
 
-impl HandshakeClientList {
+impl ClientList {
     pub(crate) fn new() -> Self {
         Self {
             used: [::bitmaps::Bitmap::<1024>::new()].to_vec(),
@@ -51,13 +50,13 @@ impl HandshakeClientList {
             list: Vec::with_capacity(16),
         }
     }
-    pub(crate) fn get(&self, id: KeyID) -> Option<&HandshakeClient> {
+    pub(crate) fn get(&self, id: KeyID) -> Option<&Client> {
         if id.0 as usize >= self.list.len() {
             return None;
         }
         self.list[id.0 as usize].as_ref()
     }
-    pub(crate) fn remove(&mut self, id: KeyID) -> Option<HandshakeClient> {
+    pub(crate) fn remove(&mut self, id: KeyID) -> Option<Client> {
         if id.0 as usize >= self.list.len() {
             return None;
         }
@@ -79,11 +78,10 @@ impl HandshakeClientList {
         pub_key: PubKey,
         service_id: ServiceID,
         service_conn_id: IDRecv,
-        connection: Connection,
+        connection: Conn,
         answer: oneshot::Sender<ConnectAnswer>,
         srv_key_id: KeyID,
-    ) -> Result<(KeyID, &mut HandshakeClient), oneshot::Sender<ConnectAnswer>>
+    ) -> Result<(KeyID, &mut Client), oneshot::Sender<ConnectAnswer>> {
-    {
         let maybe_free_key_idx =
             self.used.iter().enumerate().find_map(|(idx, bmap)| {
                 match bmap.first_false_index() {
@@ -112,7 +110,7 @@ impl HandshakeClientList {
             self.list.push(None);
         }
         self.keys[free_key_idx] = Some((priv_key, pub_key));
-        self.list[free_key_idx] = Some(HandshakeClient {
+        self.list[free_key_idx] = Some(Client {
             service_id,
             service_conn_id,
             connection,
@@ -144,8 +142,8 @@ pub(crate) struct ClientConnectInfo {
     pub service_connection_id: IDRecv,
     /// Parsed handshake packet
     pub handshake: Handshake,
-    /// Connection
+    /// Conn
-    pub connection: Connection,
+    pub connection: Conn,
     /// where to wake up the waiting client
     pub answer: oneshot::Sender<ConnectAnswer>,
     /// server public key id that we used on the handshake
@@ -153,7 +151,7 @@ pub(crate) struct ClientConnectInfo {
 }
 /// Intermediate actions to be taken while parsing the handshake
 #[derive(Debug)]
-pub(crate) enum HandshakeAction {
+pub(crate) enum Action {
     /// Parsing finished, all ok, nothing to do
     Nothing,
     /// Packet parsed, now go perform authentication
@@ -167,20 +165,20 @@ pub(crate) enum HandshakeAction {
 /// Each of them will handle a subset of all handshakes.
 /// Each handshake is routed to a different tracker by checking
 /// core = (udp_src_sender_port % total_threads) - 1
-pub(crate) struct HandshakeTracker {
+pub(crate) struct Tracker {
     thread_id: ThreadTracker,
     key_exchanges: Vec<asym::KeyExchangeKind>,
-    ciphers: Vec<CipherKind>,
+    ciphers: Vec<sym::Kind>,
     /// ephemeral keys used server side in key exchange
-    keys_srv: Vec<HandshakeServer>,
+    keys_srv: Vec<Server>,
     /// ephemeral keys used client side in key exchange
-    hshake_cli: HandshakeClientList,
+    hshake_cli: ClientList,
 }
 
-impl HandshakeTracker {
+impl Tracker {
     pub(crate) fn new(
         thread_id: ThreadTracker,
-        ciphers: Vec<CipherKind>,
+        ciphers: Vec<sym::Kind>,
         key_exchanges: Vec<asym::KeyExchangeKind>,
     ) -> Self {
         Self {
@@ -188,7 +186,7 @@ impl HandshakeTracker {
             ciphers,
             key_exchanges,
             keys_srv: Vec::new(),
-            hshake_cli: HandshakeClientList::new(),
+            hshake_cli: ClientList::new(),
         }
     }
     pub(crate) fn add_server_key(
@@ -199,7 +197,7 @@ impl HandshakeTracker {
         if self.keys_srv.iter().find(|&k| k.id == id).is_some() {
             return Err(());
         }
-        self.keys_srv.push(HandshakeServer {
+        self.keys_srv.push(Server {
             id,
             key,
             domains: Vec::new(),
@@ -233,11 +231,10 @@ impl HandshakeTracker {
         pub_key: PubKey,
         service_id: ServiceID,
         service_conn_id: IDRecv,
-        connection: Connection,
+        connection: Conn,
         answer: oneshot::Sender<ConnectAnswer>,
         srv_key_id: KeyID,
-    ) -> Result<(KeyID, &mut HandshakeClient), oneshot::Sender<ConnectAnswer>>
+    ) -> Result<(KeyID, &mut Client), oneshot::Sender<ConnectAnswer>> {
-    {
         self.hshake_cli.add(
             priv_key,
             pub_key,
@@ -248,10 +245,7 @@ impl HandshakeTracker {
             srv_key_id,
         )
     }
-    pub(crate) fn remove_client(
+    pub(crate) fn remove_client(&mut self, key_id: KeyID) -> Option<Client> {
-        &mut self,
-        key_id: KeyID,
-    ) -> Option<HandshakeClient> {
         self.hshake_cli.remove(key_id)
     }
     pub(crate) fn timeout_client(
@@ -269,10 +263,10 @@ impl HandshakeTracker {
         &mut self,
         mut handshake: Handshake,
         handshake_raw: &mut [u8],
-    ) -> Result<HandshakeAction, Error> {
+    ) -> Result<Action, Error> {
-        use connection::handshake::{dirsync::DirSync, HandshakeData};
+        use handshake::dirsync::DirSync;
         match handshake.data {
-            HandshakeData::DirSync(ref mut ds) => match ds {
+            handshake::Data::DirSync(ref mut ds) => match ds {
                 DirSync::Req(ref mut req) => {
                     if !self.key_exchanges.contains(&req.exchange) {
                         return Err(enc::Error::UnsupportedKeyExchange.into());
@@ -310,7 +304,8 @@ impl HandshakeTracker {
                         Ok(shared_key) => shared_key,
                         Err(e) => return Err(handshake::Error::Key(e).into()),
                     };
-                    let hkdf = Hkdf::new(HkdfKind::Sha3, b"fenrir", shared_key);
+                    let hkdf =
+                        Hkdf::new(hkdf::Kind::Sha3, b"fenrir", shared_key);
                     let secret_recv = hkdf.get_secret(b"to_server");
                     let cipher_recv = CipherRecv::new(req.cipher, secret_recv);
                     use crate::enc::sym::AAD;
@@ -334,7 +329,7 @@ impl HandshakeTracker {
                         }
                     }
 
-                    return Ok(HandshakeAction::AuthNeeded(AuthNeededInfo {
+                    return Ok(Action::AuthNeeded(AuthNeededInfo {
                         handshake,
                         hkdf,
                     }));
@@ -374,16 +369,14 @@ impl HandshakeTracker {
                     if let Some(timeout) = hshake.timeout {
                         timeout.abort();
                     }
-                    return Ok(HandshakeAction::ClientConnect(
+                    return Ok(Action::ClientConnect(ClientConnectInfo {
-                        ClientConnectInfo {
                         service_id: hshake.service_id,
                         service_connection_id: hshake.service_conn_id,
                         handshake,
                         connection: hshake.connection,
                         answer: hshake.answer,
                         srv_key_id: hshake.srv_key_id,
-                        },
+                    }));
-                    ));
                 }
             },
         }

src/connection/mod.rs

@@ -3,30 +3,109 @@
 pub mod handshake;
 pub mod packet;
 pub mod socket;
+pub mod stream;
 
 use ::std::{rc::Rc, vec::Vec};
 
-pub use crate::connection::{
+pub use crate::connection::{handshake::Handshake, packet::Packet};
-    handshake::Handshake,
-    packet::{ConnectionID as ID, Packet, PacketData},
-};
 
 use crate::{
     dnssec,
     enc::{
         asym::PubKey,
         hkdf::Hkdf,
-        sym::{CipherKind, CipherRecv, CipherSend},
+        sym::{self, CipherRecv, CipherSend},
         Random,
     },
     inner::ThreadTracker,
 };
+use ::std::rc;
+
+/// Fenrir Connection ID
+///
+/// 0 is special as it represents the handshake  
+/// Connection IDs are to be considered u64 little endian
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub enum ID {
+    /// Connection id 0 represent the handshake
+    Handshake,
+    /// Non-zero id can represent any connection
+    ID(::core::num::NonZeroU64),
+}
+
+impl ID {
+    /// Set the conenction id to handshake
+    pub fn new_handshake() -> Self {
+        Self::Handshake
+    }
+    /// New id from u64. PLZ NON ZERO
+    pub(crate) fn new_u64(raw: u64) -> Self {
+        #[allow(unsafe_code)]
+        unsafe {
+            ID::ID(::core::num::NonZeroU64::new_unchecked(raw))
+        }
+    }
+    pub(crate) fn as_u64(&self) -> u64 {
+        match self {
+            ID::Handshake => 0,
+            ID::ID(id) => id.get(),
+        }
+    }
+    /// New random service ID
+    pub fn new_rand(rand: &Random) -> Self {
+        let mut raw = [0; 8];
+        let mut num = 0;
+        while num == 0 {
+            rand.fill(&mut raw);
+            num = u64::from_le_bytes(raw);
+        }
+        #[allow(unsafe_code)]
+        unsafe {
+            ID::ID(::core::num::NonZeroU64::new_unchecked(num))
+        }
+    }
+    /// Quick check to know if this is an handshake
+    pub fn is_handshake(&self) -> bool {
+        *self == ID::Handshake
+    }
+    /// length if the connection ID in bytes
+    pub const fn len() -> usize {
+        8
+    }
+    /// write the ID to a buffer
+    pub fn serialize(&self, out: &mut [u8]) {
+        match self {
+            ID::Handshake => out[..8].copy_from_slice(&[0; 8]),
+            ID::ID(id) => out[..8].copy_from_slice(&id.get().to_le_bytes()),
+        }
+    }
+}
+
+impl From<u64> for ID {
+    fn from(raw: u64) -> Self {
+        if raw == 0 {
+            ID::Handshake
+        } else {
+            #[allow(unsafe_code)]
+            unsafe {
+                ID::ID(::core::num::NonZeroU64::new_unchecked(raw))
+            }
+        }
+    }
+}
+
+impl From<[u8; 8]> for ID {
+    fn from(raw: [u8; 8]) -> Self {
+        let raw_u64 = u64::from_le_bytes(raw);
+        raw_u64.into()
+    }
+}
 
 /// strong typedef for receiving connection id
-#[derive(Debug, Copy, Clone, PartialEq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct IDRecv(pub ID);
 /// strong typedef for sending connection id
-#[derive(Debug, Copy, Clone, PartialEq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct IDSend(pub ID);
 
 /// Version of the fenrir protocol in use
@@ -47,12 +126,16 @@ impl ProtocolVersion {
     }
 }
 
+/// The connection, as seen from a user of libFenrir
+#[derive(Debug)]
+pub struct Connection(rc::Weak<Conn>);
+
 /// A single connection and its data
 #[derive(Debug)]
-pub struct Connection {
+pub(crate) struct Conn {
-    /// Receiving Connection ID
+    /// Receiving Conn ID
     pub id_recv: IDRecv,
-    /// Sending Connection ID
+    /// Sending Conn ID
     pub id_send: IDSend,
     /// The main hkdf used for all secrets in this connection
     pub hkdf: Hkdf,
@@ -62,9 +145,12 @@ pub struct Connection {
     pub cipher_send: CipherSend,
 }
 
-/// Role: used to set the correct secrets
+/// Role: track the connection direction
-/// * Server: Connection is Incoming
+///
-/// * Client: Connection is Outgoing
+/// The Role is used to select the correct secrets, and track the direction
+/// of the connection
+/// * Server: Conn is Incoming
+/// * Client: Conn is Outgoing
 #[derive(Debug, Copy, Clone)]
 #[repr(u8)]
 pub enum Role {
@@ -74,10 +160,10 @@ pub enum Role {
     Client,
 }
 
-impl Connection {
+impl Conn {
     pub(crate) fn new(
         hkdf: Hkdf,
-        cipher: CipherKind,
+        cipher: sym::Kind,
         role: Role,
         rand: &Random,
     ) -> Self {
@@ -102,11 +188,9 @@ impl Connection {
     }
 }
 
-// PERF: Arc<RwLock<ConnList>> loks a bit too much, need to find
-// faster ways to do this
 pub(crate) struct ConnList {
     thread_id: ThreadTracker,
-    connections: Vec<Option<Rc<Connection>>>,
+    connections: Vec<Option<Rc<Conn>>>,
     /// Bitmap to track which connection ids are used or free
     ids_used: Vec<::bitmaps::Bitmap<1024>>,
 }
@@ -177,7 +261,7 @@ impl ConnList {
         new_id
     }
     /// NOTE: does NOT check if the connection has been previously reserved!
-    pub(crate) fn track(&mut self, conn: Rc<Connection>) -> Result<(), ()> {
+    pub(crate) fn track(&mut self, conn: Rc<Conn>) -> Result<(), ()> {
         let conn_id = match conn.id_recv {
             IDRecv(ID::Handshake) => {
                 return Err(());

src/connection/packet.rs

@@ -1,125 +1,44 @@
 //
 //! Raw packet handling, encryption, decryption, parsing
 
-use crate::enc::{
+use crate::{
-    sym::{HeadLen, TagLen},
+    connection,
-    Random,
+    enc::sym::{NonceLen, TagLen},
 };
 
-/// Fenrir Connection id
-/// 0 is special as it represents the handshake
-/// Connection IDs are to be considered u64 little endian
-#[derive(Debug, Copy, Clone, PartialEq)]
-pub enum ConnectionID {
-    /// Connection id 0 represent the handshake
-    Handshake,
-    /// Non-zero id can represent any connection
-    ID(::core::num::NonZeroU64),
-}
-
-impl ConnectionID {
-    /// Set the conenction id to handshake
-    pub fn new_handshake() -> Self {
-        Self::Handshake
-    }
-    /// New id from u64. PLZ NON ZERO
-    pub(crate) fn new_u64(raw: u64) -> Self {
-        #[allow(unsafe_code)]
-        unsafe {
-            ConnectionID::ID(::core::num::NonZeroU64::new_unchecked(raw))
-        }
-    }
-    pub(crate) fn as_u64(&self) -> u64 {
-        match self {
-            ConnectionID::Handshake => 0,
-            ConnectionID::ID(id) => id.get(),
-        }
-    }
-    /// New random service ID
-    pub fn new_rand(rand: &Random) -> Self {
-        let mut raw = [0; 8];
-        let mut num = 0;
-        while num == 0 {
-            rand.fill(&mut raw);
-            num = u64::from_le_bytes(raw);
-        }
-        #[allow(unsafe_code)]
-        unsafe {
-            ConnectionID::ID(::core::num::NonZeroU64::new_unchecked(num))
-        }
-    }
-    /// Quick check to know if this is an handshake
-    pub fn is_handshake(&self) -> bool {
-        *self == ConnectionID::Handshake
-    }
-    /// length if the connection ID in bytes
-    pub const fn len() -> usize {
-        8
-    }
-    /// write the ID to a buffer
-    pub fn serialize(&self, out: &mut [u8]) {
-        match self {
-            ConnectionID::Handshake => out[..8].copy_from_slice(&[0; 8]),
-            ConnectionID::ID(id) => {
-                out[..8].copy_from_slice(&id.get().to_le_bytes())
-            }
-        }
-    }
-}
-
-impl From<u64> for ConnectionID {
-    fn from(raw: u64) -> Self {
-        if raw == 0 {
-            ConnectionID::Handshake
-        } else {
-            #[allow(unsafe_code)]
-            unsafe {
-                ConnectionID::ID(::core::num::NonZeroU64::new_unchecked(raw))
-            }
-        }
-    }
-}
-
-impl From<[u8; 8]> for ConnectionID {
-    fn from(raw: [u8; 8]) -> Self {
-        let raw_u64 = u64::from_le_bytes(raw);
-        raw_u64.into()
-    }
-}
-
 /// Enumerate the possible data in a fenrir packet
 #[derive(Debug, Clone)]
-pub enum PacketData {
+pub enum Data {
     /// A parsed handshake packet
     Handshake(super::Handshake),
     /// Raw packet. we only have the connection ID and packet length
     Raw(usize),
 }
 
-impl PacketData {
+impl Data {
     /// total length of the data in bytes
-    pub fn len(&self, head_len: HeadLen, tag_len: TagLen) -> usize {
+    pub fn len(&self, head_len: NonceLen, tag_len: TagLen) -> usize {
         match self {
-            PacketData::Handshake(h) => h.len(head_len, tag_len),
+            Data::Handshake(h) => h.len(head_len, tag_len),
-            PacketData::Raw(len) => *len,
+            Data::Raw(len) => *len,
         }
     }
     /// serialize data into bytes
     /// NOTE: assumes that there is exactly asa much buffer as needed
     pub fn serialize(
         &self,
-        head_len: HeadLen,
+        head_len: NonceLen,
         tag_len: TagLen,
         out: &mut [u8],
     ) {
         assert!(
             self.len(head_len, tag_len) == out.len(),
-            "PacketData: wrong buffer length"
+            "Data: wrong buffer length"
         );
         match self {
-            PacketData::Handshake(h) => h.serialize(head_len, tag_len, out),
+            Data::Handshake(h) => h.serialize(head_len, tag_len, out),
-            PacketData::Raw(_) => {
+            Data::Raw(_) => {
-                ::tracing::error!("Tried to serialize a raw PacketData!");
+                ::tracing::error!("Tried to serialize a raw Data!");
             }
         }
     }
@@ -131,9 +50,9 @@ const MIN_PACKET_BYTES: usize = 16;
 #[derive(Debug, Clone)]
 pub struct Packet {
     /// Id of the Fenrir connection.
-    pub id: ConnectionID,
+    pub id: connection::ID,
     /// actual data inside the packet
-    pub data: PacketData,
+    pub data: Data,
 }
 
 impl Packet {
@@ -146,27 +65,30 @@ impl Packet {
         let raw_id: [u8; 8] = (raw[..8]).try_into().expect("unreachable");
         Ok(Packet {
             id: raw_id.into(),
-            data: PacketData::Raw(raw.len()),
+            data: Data::Raw(raw.len()),
         })
     }
     /// get the total length of the packet
-    pub fn len(&self, head_len: HeadLen, tag_len: TagLen) -> usize {
+    pub fn len(&self, head_len: NonceLen, tag_len: TagLen) -> usize {
-        ConnectionID::len() + self.data.len(head_len, tag_len)
+        connection::ID::len() + self.data.len(head_len, tag_len)
     }
     /// serialize packet into buffer
     /// NOTE: assumes that there is exactly asa much buffer as needed
     pub fn serialize(
         &self,
-        head_len: HeadLen,
+        head_len: NonceLen,
         tag_len: TagLen,
         out: &mut [u8],
     ) {
         assert!(
-            out.len() > ConnectionID::len(),
+            out.len() > connection::ID::len(),
             "Packet: not enough buffer to serialize"
         );
-        self.id.serialize(&mut out[0..ConnectionID::len()]);
+        self.id.serialize(&mut out[0..connection::ID::len()]);
-        self.data
+        self.data.serialize(
-            .serialize(head_len, tag_len, &mut out[ConnectionID::len()..]);
+            head_len,
+            tag_len,
+            &mut out[connection::ID::len()..],
+        );
     }
 }

src/connection/stream/errors.rs

@@ -0,0 +1,10 @@
+//! Errors while parsing streams
+
+
+/// Crypto errors
+#[derive(::thiserror::Error, Debug, Copy, Clone)]
+pub enum Error {
+    /// Error while parsing key material
+    #[error("Not enough data for stream chunk: {0}")]
+    NotEnoughData(usize),
+}

src/connection/stream/mod.rs

@@ -0,0 +1,183 @@
+//! Here we implement the multiplexing stream feature of Fenrir
+//!
+//! For now we will only have the TCP-like, reliable, in-order delivery
+
+mod errors;
+mod rob;
+pub use errors::Error;
+
+use crate::{connection::stream::rob::ReliableOrderedBytestream, enc::Random};
+
+/// Kind of stream. any combination of:
+/// reliable/unreliable ordered/unordered, bytestream/datagram
+#[derive(Debug, Copy, Clone)]
+#[repr(u8)]
+pub enum Kind {
+    /// ROB: Reliable, Ordered, Bytestream
+    /// AKA: TCP-like
+    ROB = 0,
+}
+
+/// Id of the stream
+#[derive(Debug, Copy, Clone)]
+pub struct ID(pub u16);
+
+impl ID {
+    /// Length of the serialized field
+    pub const fn len() -> usize {
+        2
+    }
+}
+
+/// length of the chunk
+#[derive(Debug, Copy, Clone)]
+pub struct ChunkLen(pub u16);
+
+impl ChunkLen {
+    /// Length of the serialized field
+    pub const fn len() -> usize {
+        2
+    }
+}
+
+/// Sequence number to rebuild the stream correctly
+#[derive(Debug, Copy, Clone)]
+pub struct Sequence(pub ::core::num::Wrapping<u32>);
+
+impl Sequence {
+    const SEQ_NOFLAG: u32 = 0x3FFFFFFF;
+    /// return a new sequence number, starting at random
+    pub fn new(rand: &Random) -> Self {
+        let seq: u32 = 0;
+        rand.fill(&mut seq.to_le_bytes());
+        Self(::core::num::Wrapping(seq & Self::SEQ_NOFLAG))
+    }
+    /// Length of the serialized field
+    pub const fn len() -> usize {
+        4
+    }
+}
+
+/// Chunk of data representing a stream
+/// Every chunk is as follows:
+/// | id (2 bytes) | length (2 bytes) |
+/// | flag_start (1 BIT) | flag_end (1 BIT) | sequence (30 bits) |
+#[derive(Debug, Clone)]
+pub struct Chunk<'a> {
+    /// Id of the stream this chunk is part of
+    pub id: ID,
+    /// Is this the beginning of a message?
+    pub flag_start: bool,
+    /// Is this the end of a message?
+    pub flag_end: bool,
+    /// Sequence number to reconstruct the Stream
+    pub sequence: Sequence,
+    data: &'a [u8],
+}
+
+impl<'a> Chunk<'a> {
+    const FLAGS_EXCLUDED_BITMASK: u8 = 0x3F;
+    const FLAG_START_BITMASK: u8 = 0x80;
+    const FLAG_END_BITMASK: u8 = 0x40;
+    /// Returns the total length of the chunk, including headers
+    pub fn len(&self) -> usize {
+        ID::len() + ChunkLen::len() + Sequence::len() + self.data.len()
+    }
+    /// deserialize a chunk of a stream
+    pub fn deserialize(raw: &'a [u8]) -> Result<Self, Error> {
+        if raw.len() <= ID::len() + ChunkLen::len() + Sequence::len() {
+            return Err(Error::NotEnoughData(0));
+        }
+
+        let id = ID(u16::from_le_bytes(raw[0..ID::len()].try_into().unwrap()));
+
+        let mut bytes_next = ID::len() + ChunkLen::len();
+        let length = ChunkLen(u16::from_le_bytes(
+            raw[ID::len()..bytes_next].try_into().unwrap(),
+        ));
+        if ID::len() + ChunkLen::len() + Sequence::len() + length.0 as usize
+            > raw.len()
+        {
+            return Err(Error::NotEnoughData(4));
+        }
+
+        let flag_start = (raw[bytes_next] & Self::FLAG_START_BITMASK) != 0;
+        let flag_end = (raw[bytes_next] & Self::FLAG_END_BITMASK) != 0;
+
+        let bytes = bytes_next + 1;
+        bytes_next = bytes + Sequence::len();
+        let mut sequence_bytes: [u8; Sequence::len()] =
+            raw[bytes..bytes_next].try_into().unwrap();
+        sequence_bytes[0] = sequence_bytes[0] & Self::FLAGS_EXCLUDED_BITMASK;
+        let sequence =
+            Sequence(::core::num::Wrapping(u32::from_le_bytes(sequence_bytes)));
+
+        Ok(Self {
+            id,
+            flag_start,
+            flag_end,
+            sequence,
+            data: &raw[bytes_next..(bytes_next + length.0 as usize)],
+        })
+    }
+    /// serialize a chunk of a stream
+    pub fn serialize(&self, raw_out: &mut [u8]) {
+        raw_out[0..ID::len()].copy_from_slice(&self.id.0.to_le_bytes());
+        let mut bytes_next = ID::len() + ChunkLen::len();
+        raw_out[ID::len()..bytes_next]
+            .copy_from_slice(&(self.data.len() as u16).to_le_bytes());
+        let bytes = bytes_next;
+        bytes_next = bytes_next + Sequence::len();
+        raw_out[bytes..bytes_next]
+            .copy_from_slice(&self.sequence.0 .0.to_le_bytes());
+        let mut flag_byte = raw_out[bytes] & Self::FLAGS_EXCLUDED_BITMASK;
+        if self.flag_start {
+            flag_byte = flag_byte | Self::FLAG_START_BITMASK;
+        }
+        if self.flag_end {
+            flag_byte = flag_byte | Self::FLAG_END_BITMASK;
+        }
+        raw_out[bytes] = flag_byte;
+        let bytes = bytes_next;
+        bytes_next = bytes_next + self.data.len();
+        raw_out[bytes..bytes_next].copy_from_slice(&self.data);
+    }
+}
+
+/// Kind of stream. any combination of:
+/// reliable/unreliable ordered/unordered, bytestream/datagram
+/// differences from Kind:
+///  * not public
+///  * has actual data
+#[derive(Debug, Clone)]
+pub(crate) enum Tracker {
+    /// ROB: Reliable, Ordered, Bytestream
+    /// AKA: TCP-like
+    ROB(ReliableOrderedBytestream),
+}
+
+impl Tracker {
+    pub(crate) fn new(kind: Kind, rand: &Random) -> Self {
+        match kind {
+            Kind::ROB => Tracker::ROB(ReliableOrderedBytestream::new(rand)),
+        }
+    }
+}
+
+/// Actual stream-tracking structure
+#[derive(Debug, Clone)]
+pub(crate) struct Stream {
+    id: ID,
+    data: Tracker,
+}
+
+impl Stream {
+    pub(crate) fn new(kind: Kind, rand: &Random) -> Self {
+        let id: u16 = 0;
+        rand.fill(&mut id.to_le_bytes());
+        Self {
+            id: ID(id),
+            data: Tracker::new(kind, rand),
+        }
+    }
+}

src/connection/stream/rob.rs

@@ -0,0 +1,29 @@
+//! Implementation of the Reliable, Ordered, Bytestream transmission model
+//! AKA: TCP-like
+
+use crate::{
+    connection::stream::{Chunk, Error, Sequence},
+    enc::Random,
+};
+
+/// Reliable, Ordered, Bytestream stream tracker
+/// AKA: TCP-like
+#[derive(Debug, Clone)]
+pub(crate) struct ReliableOrderedBytestream {
+    window_start: Sequence,
+    window_len: usize,
+    data: Vec<u8>,
+}
+
+impl ReliableOrderedBytestream {
+    pub(crate) fn new(rand: &Random) -> Self {
+        Self {
+            window_start: Sequence::new(rand),
+            window_len: 1048576, // 1MB. should be enough for anybody. (lol)
+            data: Vec::new(),
+        }
+    }
+    pub(crate) fn recv(&mut self, chunk: Chunk) -> Result<(), Error> {
+        todo!()
+    }
+}

src/dnssec/record.rs

@@ -43,12 +43,11 @@
 //! ]
 
 use crate::{
-    connection::handshake::HandshakeID,
+    connection::handshake,
     enc::{
         self,
         asym::{KeyExchangeKind, KeyID, PubKey},
-        hkdf::HkdfKind,
+        hkdf, sym,
-        sym::CipherKind,
     },
 };
 use ::core::num::NonZeroU16;
@@ -180,7 +179,7 @@ pub struct Address {
     /// Weight of this address in the priority group
     pub weight: AddressWeight,
     /// List of supported handshakes
-    pub handshake_ids: Vec<HandshakeID>,
+    pub handshake_ids: Vec<handshake::ID>,
     /// Public key IDs used by this address
     pub public_key_idx: Vec<PubKeyIdx>,
 }
@@ -331,7 +330,7 @@ impl Address {
         for raw_handshake_id in
             raw[bytes_parsed..(bytes_parsed + num_handshake_ids)].iter()
         {
-            match HandshakeID::from_u8(*raw_handshake_id) {
+            match handshake::ID::from_u8(*raw_handshake_id) {
                 Some(h_id) => handshake_ids.push(h_id),
                 None => {
                     ::tracing::warn!(
@@ -392,9 +391,9 @@ pub struct Record {
     /// List of supported key exchanges
     pub key_exchanges: Vec<KeyExchangeKind>,
     /// List of supported key exchanges
-    pub hkdfs: Vec<HkdfKind>,
+    pub hkdfs: Vec<hkdf::Kind>,
     /// List of supported ciphers
-    pub ciphers: Vec<CipherKind>,
+    pub ciphers: Vec<sym::Kind>,
 }
 
 impl Record {
@@ -597,7 +596,7 @@ impl Record {
             num_key_exchanges = num_key_exchanges - 1;
         }
         while num_hkdfs > 0 {
-            let hkdf = match HkdfKind::from_u8(raw[bytes_parsed]) {
+            let hkdf = match hkdf::Kind::from_u8(raw[bytes_parsed]) {
                 Some(hkdf) => hkdf,
                 None => {
                     // continue parsing. This could be a new hkdf type
@@ -615,7 +614,7 @@ impl Record {
             num_hkdfs = num_hkdfs - 1;
         }
         while num_ciphers > 0 {
-            let cipher = match CipherKind::from_u8(raw[bytes_parsed]) {
+            let cipher = match sym::Kind::from_u8(raw[bytes_parsed]) {
                 Some(cipher) => cipher,
                 None => {
                     // continue parsing. This could be a new cipher type

src/dnssec/tests.rs

@@ -12,7 +12,7 @@ fn test_dnssec_serialization() {
                 return;
             }
         };
-    use crate::{connection::handshake::HandshakeID, enc};
+    use crate::{connection::handshake, enc};
 
     let record = Record {
         public_keys: [(
@@ -25,14 +25,14 @@ fn test_dnssec_serialization() {
             port: Some(::core::num::NonZeroU16::new(31337).unwrap()),
             priority: record::AddressPriority::P1,
             weight: record::AddressWeight::W1,
-            handshake_ids: [HandshakeID::DirectorySynchronized].to_vec(),
+            handshake_ids: [handshake::ID::DirectorySynchronized].to_vec(),
             public_key_idx: [record::PubKeyIdx(0)].to_vec(),
         }]
         .to_vec(),
         key_exchanges: [enc::asym::KeyExchangeKind::X25519DiffieHellman]
             .to_vec(),
-        hkdfs: [enc::hkdf::HkdfKind::Sha3].to_vec(),
+        hkdfs: [enc::hkdf::Kind::Sha3].to_vec(),
-        ciphers: [enc::sym::CipherKind::XChaCha20Poly1305].to_vec(),
+        ciphers: [enc::sym::Kind::XChaCha20Poly1305].to_vec(),
     };
     let encoded = match record.encode() {
         Ok(encoded) => encoded,

src/enc/asym.rs

@@ -45,7 +45,7 @@ impl ::std::fmt::Display for KeyID {
 
 /// Capabilities of each key
 #[derive(Debug, Clone, Copy)]
-pub enum KeyCapabilities {
+pub enum Capabilities {
     /// signing *only*
     Sign,
     /// encrypt *only*
@@ -61,13 +61,13 @@ pub enum KeyCapabilities {
     /// All: sign, encrypt, Key Exchange
     SignEncryptExchage,
 }
-impl KeyCapabilities {
+impl Capabilities {
     /// Check if this key supports eky exchage
     pub fn has_exchange(&self) -> bool {
         match self {
-            KeyCapabilities::Exchange
+            Capabilities::Exchange
-            | KeyCapabilities::SignExchange
+            | Capabilities::SignExchange
-            | KeyCapabilities::SignEncryptExchage => true,
+            | Capabilities::SignEncryptExchage => true,
             _ => false,
         }
     }
@@ -85,7 +85,7 @@ impl KeyCapabilities {
 )]
 #[non_exhaustive]
 #[repr(u8)]
-pub enum KeyKind {
+pub enum Kind {
     /// Ed25519 Public key (sign only)
     #[strum(serialize = "ed25519")]
     Ed25519 = 0,
@@ -93,25 +93,25 @@ pub enum KeyKind {
     #[strum(serialize = "x25519")]
     X25519,
 }
-impl KeyKind {
+impl Kind {
     /// Length of the serialized field
     pub const fn len() -> usize {
         1
     }
     /// return the expected length of the public key
     pub fn pub_len(&self) -> usize {
-        KeyKind::len()
+        Kind::len()
             + match self {
                 // FIXME: 99% wrong size
-                KeyKind::Ed25519 => ::ring::signature::ED25519_PUBLIC_KEY_LEN,
+                Kind::Ed25519 => ::ring::signature::ED25519_PUBLIC_KEY_LEN,
-                KeyKind::X25519 => 32,
+                Kind::X25519 => 32,
             }
     }
     /// Get the capabilities of this key type
-    pub fn capabilities(&self) -> KeyCapabilities {
+    pub fn capabilities(&self) -> Capabilities {
         match self {
-            KeyKind::Ed25519 => KeyCapabilities::Sign,
+            Kind::Ed25519 => Capabilities::Sign,
-            KeyKind::X25519 => KeyCapabilities::Exchange,
+            Kind::X25519 => Capabilities::Exchange,
         }
     }
     /// Returns the key exchanges supported by this key
@@ -120,8 +120,8 @@ impl KeyKind {
         const X25519_KEY_EXCHANGES: [KeyExchangeKind; 1] =
             [KeyExchangeKind::X25519DiffieHellman];
         match self {
-            KeyKind::Ed25519 => &EMPTY,
+            Kind::Ed25519 => &EMPTY,
-            KeyKind::X25519 => &X25519_KEY_EXCHANGES,
+            Kind::X25519 => &X25519_KEY_EXCHANGES,
         }
     }
     /// generate new keypair
@@ -193,21 +193,21 @@ impl PubKey {
         }
     }
     /// return the kind of public key
-    pub fn kind(&self) -> KeyKind {
+    pub fn kind(&self) -> Kind {
         match self {
             // FIXME: lie, we don't fully support this
-            PubKey::Signing => KeyKind::Ed25519,
+            PubKey::Signing => Kind::Ed25519,
             PubKey::Exchange(ex) => ex.kind(),
         }
     }
     /// generate new keypair
     fn new_keypair(
-        kind: KeyKind,
+        kind: Kind,
         rnd: &Random,
     ) -> Result<(PrivKey, PubKey), Error> {
         match kind {
-            KeyKind::Ed25519 => todo!(),
+            Kind::Ed25519 => todo!(),
-            KeyKind::X25519 => {
+            Kind::X25519 => {
                 let (priv_key, pub_key) =
                     KeyExchangeKind::X25519DiffieHellman.new_keypair(rnd)?;
                 Ok((PrivKey::Exchange(priv_key), PubKey::Exchange(pub_key)))
@@ -231,7 +231,7 @@ impl PubKey {
         if raw.len() < 1 {
             return Err(Error::NotEnoughData(0));
         }
-        let kind: KeyKind = match KeyKind::from_u8(raw[0]) {
+        let kind: Kind = match Kind::from_u8(raw[0]) {
             Some(kind) => kind,
             None => return Err(Error::UnsupportedKey(1)),
         };
@@ -239,11 +239,11 @@ impl PubKey {
             return Err(Error::NotEnoughData(1));
         }
         match kind {
-            KeyKind::Ed25519 => {
+            Kind::Ed25519 => {
                 ::tracing::error!("ed25519 keys are not yet supported");
                 return Err(Error::Parsing);
             }
-            KeyKind::X25519 => {
+            Kind::X25519 => {
                 let pub_key: ::x25519_dalek::PublicKey =
                     //match ::bincode::deserialize(&raw[1..(1 + kind.pub_len())])
                     match ::bincode::deserialize(&raw[1..])
@@ -284,7 +284,7 @@ impl PrivKey {
         }
     }
     /// return the kind of public key
-    pub fn kind(&self) -> KeyKind {
+    pub fn kind(&self) -> Kind {
         match self {
             PrivKey::Signing => todo!(),
             PrivKey::Exchange(ex) => ex.kind(),
@@ -322,13 +322,13 @@ impl ExchangePrivKey {
     /// Get the serialized key length
     pub fn len(&self) -> usize {
         match self {
-            ExchangePrivKey::X25519(_) => KeyKind::X25519.pub_len(),
+            ExchangePrivKey::X25519(_) => Kind::X25519.pub_len(),
         }
     }
     /// Get the kind of key
-    pub fn kind(&self) -> KeyKind {
+    pub fn kind(&self) -> Kind {
         match self {
-            ExchangePrivKey::X25519(_) => KeyKind::X25519,
+            ExchangePrivKey::X25519(_) => Kind::X25519,
         }
     }
     /// Run the key exchange between two keys of the same kind
@@ -372,13 +372,13 @@ impl ExchangePubKey {
     /// Get the serialized key length
     pub fn len(&self) -> usize {
         match self {
-            ExchangePubKey::X25519(_) => KeyKind::X25519.pub_len(),
+            ExchangePubKey::X25519(_) => Kind::X25519.pub_len(),
         }
     }
     /// Get the kind of key
-    pub fn kind(&self) -> KeyKind {
+    pub fn kind(&self) -> Kind {
         match self {
-            ExchangePubKey::X25519(_) => KeyKind::X25519,
+            ExchangePubKey::X25519(_) => Kind::X25519,
         }
     }
     /// serialize the key into the buffer
@@ -396,13 +396,13 @@ impl ExchangePubKey {
     /// The riesult is "unparsed" since we don't verify
     /// the actual key
     pub fn deserialize(raw: &[u8]) -> Result<(Self, usize), Error> {
-        match KeyKind::from_u8(raw[0]) {
+        match Kind::from_u8(raw[0]) {
             Some(kind) => match kind {
-                KeyKind::Ed25519 => {
+                Kind::Ed25519 => {
                     ::tracing::error!("ed25519 keys are not yet supported");
                     return Err(Error::Parsing);
                 }
-                KeyKind::X25519 => {
+                Kind::X25519 => {
                     let pub_key: ::x25519_dalek::PublicKey =
                         match ::bincode::deserialize(
                             &raw[1..(1 + kind.pub_len())],

src/enc/hkdf.rs

@@ -18,12 +18,12 @@ use crate::{config::Config, enc::Secret};
 )]
 #[non_exhaustive]
 #[repr(u8)]
-pub enum HkdfKind {
+pub enum Kind {
     /// Sha3
     #[strum(serialize = "sha3")]
     Sha3 = 0,
 }
-impl HkdfKind {
+impl Kind {
     /// Length of the serialized type
     pub const fn len() -> usize {
         1
@@ -34,7 +34,7 @@ impl HkdfKind {
 #[derive(Clone)]
 pub enum Hkdf {
     /// Sha3 based
-    Sha3(HkdfSha3),
+    Sha3(Sha3),
 }
 
 // Fake debug implementation to avoid leaking secrets
@@ -49,9 +49,9 @@ impl ::core::fmt::Debug for Hkdf {
 
 impl Hkdf {
     /// New Hkdf
-    pub fn new(kind: HkdfKind, salt: &[u8], key: Secret) -> Self {
+    pub fn new(kind: Kind, salt: &[u8], key: Secret) -> Self {
         match kind {
-            HkdfKind::Sha3 => Self::Sha3(HkdfSha3::new(salt, key)),
+            Kind::Sha3 => Self::Sha3(Sha3::new(salt, key)),
         }
     }
     /// Get a secret generated from the key and a given context
@@ -61,9 +61,9 @@ impl Hkdf {
         }
     }
     /// get the kind of this Hkdf
-    pub fn kind(&self) -> HkdfKind {
+    pub fn kind(&self) -> Kind {
         match self {
-            Hkdf::Sha3(_) => HkdfKind::Sha3,
+            Hkdf::Sha3(_) => Kind::Sha3,
         }
     }
 }
@@ -106,11 +106,11 @@ impl Clone for HkdfInner {
 
 /// Sha3 based HKDF
 #[derive(Clone)]
-pub struct HkdfSha3 {
+pub struct Sha3 {
     inner: HkdfInner,
 }
 
-impl HkdfSha3 {
+impl Sha3 {
     /// Instantiate a new HKDF with Sha3-256
     pub(crate) fn new(salt: &[u8], key: Secret) -> Self {
         let hkdf = ::hkdf::Hkdf::<Sha3_256>::new(Some(salt), key.as_ref());
@@ -132,7 +132,7 @@ impl HkdfSha3 {
 }
 
 // Fake debug implementation to avoid leaking secrets
-impl ::core::fmt::Debug for HkdfSha3 {
+impl ::core::fmt::Debug for Sha3 {
     fn fmt(
         &self,
         f: &mut core::fmt::Formatter<'_>,
@@ -146,8 +146,8 @@ impl ::core::fmt::Debug for HkdfSha3 {
 /// Give priority to our list
 pub fn server_select_hkdf(
     cfg: &Config,
-    client_supported: &Vec<HkdfKind>,
+    client_supported: &Vec<Kind>,
-) -> Option<HkdfKind> {
+) -> Option<Kind> {
     cfg.hkdfs
         .iter()
         .find(|h| client_supported.contains(h))
@@ -159,8 +159,8 @@ pub fn server_select_hkdf(
 /// this is used only in the directory synchronized handshake
 pub fn client_select_hkdf(
     cfg: &Config,
-    server_supported: &Vec<HkdfKind>,
+    server_supported: &Vec<Kind>,
-) -> Option<HkdfKind> {
+) -> Option<Kind> {
     server_supported
         .iter()
         .find(|h| cfg.hkdfs.contains(h))

src/enc/sym.rs

@@ -17,20 +17,20 @@ use crate::{
     ::strum_macros::IntoStaticStr,
 )]
 #[repr(u8)]
-pub enum CipherKind {
+pub enum Kind {
     /// XChaCha20_Poly1305
     #[strum(serialize = "xchacha20poly1305")]
     XChaCha20Poly1305 = 0,
 }
 
-impl CipherKind {
+impl Kind {
     /// length of the serialized id for the cipher kind field
     pub const fn len() -> usize {
         1
     }
     /// required length of the nonce
-    pub fn nonce_len(&self) -> HeadLen {
+    pub fn nonce_len(&self) -> NonceLen {
-        HeadLen(Nonce::len())
+        Nonce::len()
     }
     /// required length of the key
     pub fn key_len(&self) -> usize {
@@ -48,21 +48,10 @@ impl CipherKind {
 #[derive(Debug)]
 pub struct AAD<'a>(pub &'a [u8]);
 
-/// Cipher direction, to make sure we don't reuse the same cipher
-/// for both decrypting and encrypting
-#[derive(Debug, Copy, Clone)]
-#[repr(u8)]
-pub enum CipherDirection {
-    /// Receive, to decrypt only
-    Recv = 0,
-    /// Send, to encrypt only
-    Send,
-}
-
 /// strong typedef for header length
 /// aka: nonce length in the encrypted data)
 #[derive(Debug, Copy, Clone)]
-pub struct HeadLen(pub usize);
+pub struct NonceLen(pub usize);
 /// strong typedef for the Tag length
 /// aka: cryptographic authentication tag length at the end
 /// of the encrypted data
@@ -77,21 +66,21 @@ enum Cipher {
 
 impl Cipher {
     /// Build a new Cipher
-    fn new(kind: CipherKind, secret: Secret) -> Self {
+    fn new(kind: Kind, secret: Secret) -> Self {
         match kind {
-            CipherKind::XChaCha20Poly1305 => {
+            Kind::XChaCha20Poly1305 => {
                 Self::XChaCha20Poly1305(XChaCha20Poly1305::new(secret))
             }
         }
     }
-    pub fn kind(&self) -> CipherKind {
+    pub fn kind(&self) -> Kind {
         match self {
-            Cipher::XChaCha20Poly1305(_) => CipherKind::XChaCha20Poly1305,
+            Cipher::XChaCha20Poly1305(_) => Kind::XChaCha20Poly1305,
         }
     }
-    fn nonce_len(&self) -> HeadLen {
+    fn nonce_len(&self) -> NonceLen {
         match self {
-            Cipher::XChaCha20Poly1305(_) => HeadLen(Nonce::len()),
+            Cipher::XChaCha20Poly1305(_) => Nonce::len(),
         }
     }
     fn tag_len(&self) -> TagLen {
@@ -117,7 +106,7 @@ impl Cipher {
                         return Err(Error::NotEnoughData(raw_data.len()));
                     }
                     let (nonce_bytes, data_and_tag) =
-                        raw_data.split_at_mut(Nonce::len());
+                        raw_data.split_at_mut(Nonce::len().0);
                     let (data_notag, tag_bytes) = data_and_tag.split_at_mut(
                         data_and_tag.len()
                             - ::ring::aead::CHACHA20_POLY1305.tag_len(),
@@ -137,20 +126,20 @@ impl Cipher {
                 };
                 //data.drain(..Nonce::len());
                 //data.truncate(final_len);
-                Ok(&raw_data[Nonce::len()..Nonce::len() + final_len])
+                Ok(&raw_data[Nonce::len().0..Nonce::len().0 + final_len])
             }
         }
     }
     fn overhead(&self) -> usize {
         match self {
             Cipher::XChaCha20Poly1305(_) => {
-                let cipher = CipherKind::XChaCha20Poly1305;
+                let cipher = Kind::XChaCha20Poly1305;
                 cipher.nonce_len().0 + cipher.tag_len().0
             }
         }
     }
     fn encrypt(
-        &self,
+        &mut self,
         nonce: &Nonce,
         aad: AAD,
         data: &mut [u8],
@@ -162,13 +151,13 @@ impl Cipher {
                 let tag_len: usize = ::ring::aead::CHACHA20_POLY1305.tag_len();
                 let data_len_notag = data.len() - tag_len;
                 // write nonce
-                data[..Nonce::len()].copy_from_slice(nonce.as_bytes());
+                data[..Nonce::len().0].copy_from_slice(nonce.as_bytes());
 
                 // encrypt data
                 match cipher.cipher.encrypt_in_place_detached(
                     nonce.as_bytes().into(),
                     aad.0,
-                    &mut data[Nonce::len()..data_len_notag],
+                    &mut data[Nonce::len().0..data_len_notag],
                 ) {
                     Ok(tag) => {
                         data[data_len_notag..].copy_from_slice(tag.as_slice());
@@ -194,11 +183,11 @@ impl ::core::fmt::Debug for CipherRecv {
 
 impl CipherRecv {
     /// Build a new Cipher
-    pub fn new(kind: CipherKind, secret: Secret) -> Self {
+    pub fn new(kind: Kind, secret: Secret) -> Self {
         Self(Cipher::new(kind, secret))
     }
     /// Get the length of the nonce  for this cipher
-    pub fn nonce_len(&self) -> HeadLen {
+    pub fn nonce_len(&self) -> NonceLen {
         self.0.nonce_len()
     }
     /// Get the length of the nonce  for this cipher
@@ -215,14 +204,14 @@ impl CipherRecv {
         self.0.decrypt(aad, data)
     }
     /// return the underlying cipher id
-    pub fn kind(&self) -> CipherKind {
+    pub fn kind(&self) -> Kind {
         self.0.kind()
     }
 }
 
 /// Send only cipher
 pub struct CipherSend {
-    nonce: NonceSync,
+    nonce: Nonce,
     cipher: Cipher,
 }
 impl ::core::fmt::Debug for CipherSend {
@@ -236,20 +225,20 @@ impl ::core::fmt::Debug for CipherSend {
 
 impl CipherSend {
     /// Build a new Cipher
-    pub fn new(kind: CipherKind, secret: Secret, rand: &Random) -> Self {
+    pub fn new(kind: Kind, secret: Secret, rand: &Random) -> Self {
         Self {
-            nonce: NonceSync::new(rand),
+            nonce: Nonce::new(rand),
             cipher: Cipher::new(kind, secret),
         }
     }
     /// Encrypt the given data
-    pub fn encrypt(&self, aad: AAD, data: &mut [u8]) -> Result<(), Error> {
+    pub fn encrypt(&mut self, aad: AAD, data: &mut [u8]) -> Result<(), Error> {
         let old_nonce = self.nonce.advance();
         self.cipher.encrypt(&old_nonce, aad, data)?;
         Ok(())
     }
     /// return the underlying cipher id
-    pub fn kind(&self) -> CipherKind {
+    pub fn kind(&self) -> Kind {
         self.cipher.kind()
     }
 }
@@ -285,7 +274,7 @@ struct NonceNum {
 #[repr(C)]
 pub union Nonce {
     num: NonceNum,
-    raw: [u8; Self::len()],
+    raw: [u8; Self::len().0],
 }
 
 impl ::core::fmt::Debug for Nonce {
@@ -303,17 +292,17 @@ impl ::core::fmt::Debug for Nonce {
 impl Nonce {
     /// Generate a new random Nonce
     pub fn new(rand: &Random) -> Self {
-        let mut raw = [0; Self::len()];
+        let mut raw = [0; Self::len().0];
         rand.fill(&mut raw);
         Self { raw }
     }
     /// Length of this nonce in bytes
-    pub const fn len() -> usize {
+    pub const fn len() -> NonceLen {
         // FIXME: was:12. xchacha20poly1305 requires 24.
         // but we should change keys much earlier than that, and our
         // nonces are not random, but sequential.
         // we should change keys every 2^30 bytes to be sure (stream max window)
-        return 24;
+        return NonceLen(24);
     }
     /// Get reference to the nonce bytes
     pub fn as_bytes(&self) -> &[u8] {
@@ -323,11 +312,12 @@ impl Nonce {
         }
     }
     /// Create Nonce from array
-    pub fn from_slice(raw: [u8; Self::len()]) -> Self {
+    pub fn from_slice(raw: [u8; Self::len().0]) -> Self {
         Self { raw }
     }
     /// Go to the next nonce
-    pub fn advance(&mut self) {
+    pub fn advance(&mut self) -> Self {
+        let old_nonce = self.clone();
         #[allow(unsafe_code)]
         unsafe {
             let old_low = self.num.low;
@@ -336,40 +326,17 @@ impl Nonce {
                 self.num.high = self.num.high;
             }
         }
-    }
-}
-
-/// Synchronize the mutex acess with a nonce for multithread safety
-// TODO: remove mutex, not needed anymore
-#[derive(Debug)]
-pub struct NonceSync {
-    nonce: ::std::sync::Mutex<Nonce>,
-}
-impl NonceSync {
-    /// Create a new thread safe nonce
-    pub fn new(rand: &Random) -> Self {
-        Self {
-            nonce: ::std::sync::Mutex::new(Nonce::new(rand)),
-        }
-    }
-    /// Advance the nonce and return the *old* value
-    pub fn advance(&self) -> Nonce {
-        let old_nonce: Nonce;
-        {
-            let mut nonce = self.nonce.lock().unwrap();
-            old_nonce = *nonce;
-            nonce.advance();
-        }
         old_nonce
     }
 }
+
 /// Select the best cipher from our supported list
 /// and the other endpoint supported list.
 /// Give priority to our list
 pub fn server_select_cipher(
     cfg: &Config,
-    client_supported: &Vec<CipherKind>,
+    client_supported: &Vec<Kind>,
-) -> Option<CipherKind> {
+) -> Option<Kind> {
     cfg.ciphers
         .iter()
         .find(|c| client_supported.contains(c))
@@ -381,8 +348,8 @@ pub fn server_select_cipher(
 /// This is used only in the Directory synchronized handshake
 pub fn client_select_cipher(
     cfg: &Config,
-    server_supported: &Vec<CipherKind>,
+    server_supported: &Vec<Kind>,
-) -> Option<CipherKind> {
+) -> Option<Kind> {
     server_supported
         .iter()
         .find(|c| cfg.ciphers.contains(c))

src/enc/tests.rs

@@ -1,24 +1,26 @@
 use crate::{
-    auth,
+    connection::{
-    connection::{handshake::*, ID},
+        handshake::{self, *},
+        ID,
+    },
     enc::{self, asym::KeyID},
 };
 
 #[test]
 fn test_simple_encrypt_decrypt() {
     let rand = enc::Random::new();
-    let cipher = enc::sym::CipherKind::XChaCha20Poly1305;
+    let cipher = enc::sym::Kind::XChaCha20Poly1305;
     let secret = enc::Secret::new_rand(&rand);
     let secret2 = secret.clone();
 
-    let cipher_send = enc::sym::CipherSend::new(cipher, secret, &rand);
+    let mut cipher_send = enc::sym::CipherSend::new(cipher, secret, &rand);
     let cipher_recv = enc::sym::CipherRecv::new(cipher, secret2);
 
     let mut data = Vec::new();
     let tot_len = cipher_recv.nonce_len().0 + 1234 + cipher_recv.tag_len().0;
     data.resize(tot_len, 0);
     rand.fill(&mut data);
-    data[..enc::sym::Nonce::len()].copy_from_slice(&[0; 24]);
+    data[..enc::sym::Nonce::len().0].copy_from_slice(&[0; 24]);
     let last = data.len() - cipher_recv.tag_len().0;
     data[last..].copy_from_slice(&[0; 16]);
     let orig = data.clone();
@@ -31,7 +33,7 @@ fn test_simple_encrypt_decrypt() {
     if cipher_recv.decrypt(aad2, &mut data).is_err() {
         assert!(false, "Decrypt failed");
     }
-    data[..enc::sym::Nonce::len()].copy_from_slice(&[0; 24]);
+    data[..enc::sym::Nonce::len().0].copy_from_slice(&[0; 24]);
     let last = data.len() - cipher_recv.tag_len().0;
     data[last..].copy_from_slice(&[0; 16]);
     assert!(orig == data, "DIFFERENT!\n{:?}\n{:?}\n", orig, data);
@@ -40,18 +42,18 @@ fn test_simple_encrypt_decrypt() {
 #[test]
 fn test_encrypt_decrypt() {
     let rand = enc::Random::new();
-    let cipher = enc::sym::CipherKind::XChaCha20Poly1305;
+    let cipher = enc::sym::Kind::XChaCha20Poly1305;
     let secret = enc::Secret::new_rand(&rand);
     let secret2 = secret.clone();
 
-    let cipher_send = enc::sym::CipherSend::new(cipher, secret, &rand);
+    let mut cipher_send = enc::sym::CipherSend::new(cipher, secret, &rand);
     let cipher_recv = enc::sym::CipherRecv::new(cipher, secret2);
     let nonce_len = cipher_recv.nonce_len();
     let tag_len = cipher_recv.tag_len();
 
     let service_key = enc::Secret::new_rand(&rand);
 
-    let data = dirsync::RespInner::ClearText(dirsync::RespData {
+    let data = dirsync::resp::State::ClearText(dirsync::resp::Data {
         client_nonce: dirsync::Nonce::new(&rand),
         id: ID::ID(::core::num::NonZeroU64::new(424242).unwrap()),
         service_connection_id: ID::ID(
@@ -60,7 +62,7 @@ fn test_encrypt_decrypt() {
         service_key,
     });
 
-    let resp = dirsync::Resp {
+    let resp = dirsync::resp::Resp {
         client_key_id: KeyID(4444),
         data,
     };
@@ -68,7 +70,7 @@ fn test_encrypt_decrypt() {
     let encrypt_to = encrypt_from + resp.encrypted_length(nonce_len, tag_len);
 
     let h_resp =
-        Handshake::new(HandshakeData::DirSync(dirsync::DirSync::Resp(resp)));
+        Handshake::new(handshake::Data::DirSync(dirsync::DirSync::Resp(resp)));
 
     let mut bytes = Vec::<u8>::with_capacity(
         h_resp.len(cipher.nonce_len(), cipher.tag_len()),
@@ -117,7 +119,7 @@ fn test_encrypt_decrypt() {
         }
     };
     // reparse
-    if let HandshakeData::DirSync(dirsync::DirSync::Resp(r_a)) =
+    if let handshake::Data::DirSync(dirsync::DirSync::Resp(r_a)) =
         &mut deserialized.data
     {
         let enc_start = r_a.encrypted_offset() + cipher.nonce_len().0;

src/inner/worker.rs

@@ -7,16 +7,16 @@ use crate::{
         handshake::{
             self,
             dirsync::{self, DirSync},
-            tracker::{HandshakeAction, HandshakeTracker},
+            Handshake,
-            Handshake, HandshakeData,
         },
+        packet::{self, Packet},
         socket::{UdpClient, UdpServer},
-        ConnList, Connection, IDSend, Packet,
+        Conn, ConnList, IDSend,
     },
     dnssec,
     enc::{
         asym::{self, KeyID, PrivKey, PubKey},
-        hkdf::{self, Hkdf, HkdfKind},
+        hkdf::{self, Hkdf},
         sym, Random, Secret,
     },
     inner::ThreadTracker,
@@ -68,7 +68,7 @@ pub struct Worker {
     queue_timeouts_send: mpsc::UnboundedSender<Work>,
     thread_channels: Vec<::async_channel::Sender<Work>>,
     connections: ConnList,
-    handshakes: HandshakeTracker,
+    handshakes: handshake::Tracker,
 }
 
 #[allow(unsafe_code)]
@@ -85,7 +85,7 @@ impl Worker {
     ) -> ::std::io::Result<Self> {
         let (queue_timeouts_send, queue_timeouts_recv) =
             mpsc::unbounded_channel();
-        let mut handshakes = HandshakeTracker::new(
+        let mut handshakes = handshake::Tracker::new(
             thread_id,
             cfg.ciphers.clone(),
             cfg.key_exchanges.clone(),
@@ -125,6 +125,7 @@ impl Worker {
             handshakes,
         })
     }
+
     /// Continuously loop and process work as needed
     pub async fn work_loop(&mut self) {
         'mainloop: loop {
@@ -292,7 +293,7 @@ impl Worker {
                         // are PubKey::Exchange
                         unreachable!()
                     }
-                    let mut conn = Connection::new(
+                    let mut conn = Conn::new(
                         hkdf,
                         cipher_selected,
                         connection::Role::Client,
@@ -325,39 +326,39 @@ impl Worker {
                     };
 
                     // build request
-                    let auth_info = dirsync::AuthInfo {
+                    let auth_info = dirsync::req::AuthInfo {
                         user: UserID::new_anonymous(),
                         token: Token::new_anonymous(&self.rand),
                         service_id: conn_info.service_id,
                         domain: conn_info.domain,
                     };
-                    let req_data = dirsync::ReqData {
+                    let req_data = dirsync::req::Data {
                         nonce: dirsync::Nonce::new(&self.rand),
                         client_key_id,
                         id: auth_recv_id.0, //FIXME: is zero
                         auth: auth_info,
                     };
-                    let req = dirsync::Req {
+                    let req = dirsync::req::Req {
                         key_id: key.0,
                         exchange,
                         hkdf: hkdf_selected,
                         cipher: cipher_selected,
                         exchange_key: pub_key,
-                        data: dirsync::ReqInner::ClearText(req_data),
+                        data: dirsync::req::State::ClearText(req_data),
                     };
-                    let encrypt_start = ID::len() + req.encrypted_offset();
+                    let encrypt_start =
+                        connection::ID::len() + req.encrypted_offset();
                     let encrypt_end = encrypt_start
                         + req.encrypted_length(
                             cipher_selected.nonce_len(),
                             cipher_selected.tag_len(),
                         );
-                    let h_req = Handshake::new(HandshakeData::DirSync(
+                    let h_req = Handshake::new(handshake::Data::DirSync(
                         DirSync::Req(req),
                     ));
-                    use connection::{PacketData, ID};
                     let packet = Packet {
-                        id: ID::Handshake,
+                        id: connection::ID::Handshake,
-                        data: PacketData::Handshake(h_req),
+                        data: packet::Data::Handshake(h_req),
                     };
 
                     let tot_len = packet.len(
@@ -448,9 +449,9 @@ impl Worker {
                 }
             };
             match action {
-                HandshakeAction::AuthNeeded(authinfo) => {
+                handshake::Action::AuthNeeded(authinfo) => {
                     let req;
-                    if let HandshakeData::DirSync(DirSync::Req(r)) =
+                    if let handshake::Data::DirSync(DirSync::Req(r)) =
                         authinfo.handshake.data
                     {
                         req = r;
@@ -458,9 +459,8 @@ impl Worker {
                         ::tracing::error!("AuthInfo on non DS::Req");
                         return;
                     }
-                    use dirsync::ReqInner;
                     let req_data = match req.data {
-                        ReqInner::ClearText(req_data) => req_data,
+                        dirsync::req::State::ClearText(req_data) => req_data,
                         _ => {
                             ::tracing::error!("AuthNeeded: expected ClearText");
                             assert!(false, "AuthNeeded: unreachable");
@@ -510,12 +510,12 @@ impl Worker {
                     // Client has correctly authenticated
                     // TODO: contact the service, get the key and
                     // connection ID
-                    let srv_conn_id = ID::new_rand(&self.rand);
+                    let srv_conn_id = connection::ID::new_rand(&self.rand);
                     let srv_secret = Secret::new_rand(&self.rand);
                     let head_len = req.cipher.nonce_len();
                     let tag_len = req.cipher.tag_len();
 
-                    let mut auth_conn = Connection::new(
+                    let mut auth_conn = Conn::new(
                         authinfo.hkdf,
                         req.cipher,
                         connection::Role::Server,
@@ -526,7 +526,7 @@ impl Worker {
                     let auth_id_recv = self.connections.reserve_first();
                     auth_conn.id_recv = auth_id_recv;
 
-                    let resp_data = dirsync::RespData {
+                    let resp_data = dirsync::resp::Data {
                         client_nonce: req_data.nonce,
                         id: auth_conn.id_recv.0,
                         service_connection_id: srv_conn_id,
@@ -536,21 +536,20 @@ impl Worker {
                     // no aad for now
                     let aad = AAD(&mut []);
 
-                    use dirsync::RespInner;
+                    let resp = dirsync::resp::Resp {
-                    let resp = dirsync::Resp {
                         client_key_id: req_data.client_key_id,
-                        data: RespInner::ClearText(resp_data),
+                        data: dirsync::resp::State::ClearText(resp_data),
                     };
-                    let encrypt_from = ID::len() + resp.encrypted_offset();
+                    let encrypt_from =
+                        connection::ID::len() + resp.encrypted_offset();
                     let encrypt_until =
                         encrypt_from + resp.encrypted_length(head_len, tag_len);
                     let resp_handshake = Handshake::new(
-                        HandshakeData::DirSync(DirSync::Resp(resp)),
+                        handshake::Data::DirSync(DirSync::Resp(resp)),
                     );
-                    use connection::{PacketData, ID};
                     let packet = Packet {
-                        id: ID::new_handshake(),
+                        id: connection::ID::new_handshake(),
-                        data: PacketData::Handshake(resp_handshake),
+                        data: packet::Data::Handshake(resp_handshake),
                     };
                     let tot_len = packet.len(head_len, tag_len);
                     let mut raw_out = Vec::<u8>::with_capacity(tot_len);
@@ -566,9 +565,9 @@ impl Worker {
                     }
                     self.send_packet(raw_out, udp.src, udp.dst).await;
                 }
-                HandshakeAction::ClientConnect(cci) => {
+                handshake::Action::ClientConnect(cci) => {
                     let ds_resp;
-                    if let HandshakeData::DirSync(DirSync::Resp(resp)) =
+                    if let handshake::Data::DirSync(DirSync::Resp(resp)) =
                         cci.handshake.data
                     {
                         ds_resp = resp;
@@ -578,7 +577,8 @@ impl Worker {
                     }
                     // track connection
                     let resp_data;
-                    if let dirsync::RespInner::ClearText(r_data) = ds_resp.data
+                    if let dirsync::resp::State::ClearText(r_data) =
+                        ds_resp.data
                     {
                         resp_data = r_data;
                     } else {
@@ -607,11 +607,11 @@ impl Worker {
                         //FIXME: the Secret should be XORed with the client
                         // stored secret (if any)
                         let hkdf = Hkdf::new(
-                            HkdfKind::Sha3,
+                            hkdf::Kind::Sha3,
                             cci.service_id.as_bytes(),
                             resp_data.service_key,
                         );
-                        let mut service_connection = Connection::new(
+                        let mut service_connection = Conn::new(
                             hkdf,
                             cipher,
                             connection::Role::Client,
@@ -626,7 +626,7 @@ impl Worker {
                     let _ =
                         cci.answer.send(Ok((cci.srv_key_id, auth_srv_conn)));
                 }
-                HandshakeAction::Nothing => {}
+                handshake::Action::Nothing => {}
             };
         }
     }

src/lib.rs

@@ -39,6 +39,7 @@ use crate::{
     },
 };
 pub use config::Config;
+pub use connection::Connection;
 
 /// Main fenrir library errors
 #[derive(::thiserror::Error, Debug)]
@@ -332,7 +333,7 @@ impl Fenrir {
             let data: Vec<u8> = buffer[..bytes].to_vec();
 
             // we very likely have multiple threads, pinned to different cpus.
-            // use the ConnectionID to send the same connection
+            // use the connection::ID to send the same connection
             // to the same thread.
             // Handshakes have connection ID 0, so we use the sender's UDP port
 
@@ -341,13 +342,12 @@ impl Fenrir {
                 Err(_) => continue, // packet way too short, ignore.
             };
             let thread_idx: usize = {
-                use connection::packet::ConnectionID;
                 match packet.id {
-                    ConnectionID::Handshake => {
+                    connection::ID::Handshake => {
                         let send_port = sock_sender.0.port() as u64;
                         (send_port % queues_num) as usize
                     }
-                    ConnectionID::ID(id) => (id.get() % queues_num) as usize,
+                    connection::ID::ID(id) => (id.get() % queues_num) as usize,
                 }
             };
             let _ = work_queues[thread_idx]

src/tests.rs

@@ -62,10 +62,7 @@ async fn test_connection_dirsync() {
         rt.block_on(local_thread);
     });
 
-    use crate::{
+    use crate::dnssec::{record, Record};
-        connection::handshake::HandshakeID,
-        dnssec::{record, Record},
-    };
 
     let port: u16 = server.addresses()[0].port();
 
@@ -76,14 +73,14 @@ async fn test_connection_dirsync() {
             port: Some(::core::num::NonZeroU16::new(port).unwrap()),
             priority: record::AddressPriority::P1,
             weight: record::AddressWeight::W1,
-            handshake_ids: [HandshakeID::DirectorySynchronized].to_vec(),
+            handshake_ids: [handshake::ID::DirectorySynchronized].to_vec(),
             public_key_idx: [record::PubKeyIdx(0)].to_vec(),
         }]
         .to_vec(),
         key_exchanges: [enc::asym::KeyExchangeKind::X25519DiffieHellman]
             .to_vec(),
-        hkdfs: [enc::hkdf::HkdfKind::Sha3].to_vec(),
+        hkdfs: [enc::hkdf::Kind::Sha3].to_vec(),
-        ciphers: [enc::sym::CipherKind::XChaCha20Poly1305].to_vec(),
+        ciphers: [enc::sym::Kind::XChaCha20Poly1305].to_vec(),
     };
 
     ::tokio::time::sleep(::std::time::Duration::from_millis(500)).await;