1 files changed, 242 insertions, 0 deletions
diff --git a/src/handshake/messages.rs b/src/handshake/messages.rs
new file mode 100644
index 0000000..8fa08b3
--- /dev/null
+++ b/src/handshake/messages.rs
@@ -0,0 +1,242 @@
+#[cfg(test)]
+use hex;
+
+#[cfg(test)]
+use std::fmt;
+
+use byteorder::LittleEndian;
+use zerocopy::byteorder::U32;
+use zerocopy::{AsBytes, ByteSlice, FromBytes, LayoutVerified};
+
+use super::macs::MacsFooter;
+use super::timestamp;
+use super::types::*;
+
+const SIZE_TAG: usize = 16; // poly1305 tag
+const SIZE_NONCE: usize = 16; // xchacha20 nonce
+const SIZE_COOKIE: usize = 16; //
+const SIZE_X25519_POINT: usize = 32; // x25519 public key
+
+pub const TYPE_INITIATION: u8 = 1;
+pub const TYPE_RESPONSE: u8 = 2;
+pub const TYPE_COOKIEREPLY: u8 = 3;
+
+#[repr(C)]
+#[derive(Copy, Clone, FromBytes, AsBytes)]
+pub struct Initiation {
+    f_type: U32<LittleEndian>,
+    pub f_sender: U32<LittleEndian>,
+    pub f_ephemeral: [u8; SIZE_X25519_POINT],
+    pub f_static: [u8; SIZE_X25519_POINT],
+    pub f_static_tag: [u8; SIZE_TAG],
+    pub f_timestamp: timestamp::TAI64N,
+    pub f_timestamp_tag: [u8; SIZE_TAG],
+    pub f_macs: MacsFooter,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, FromBytes, AsBytes)]
+pub struct Response {
+    f_type: U32<LittleEndian>,
+    pub f_sender: U32<LittleEndian>,
+    pub f_receiver: U32<LittleEndian>,
+    pub f_ephemeral: [u8; SIZE_X25519_POINT],
+    pub f_empty_tag: [u8; SIZE_TAG],
+    pub f_macs: MacsFooter,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, FromBytes, AsBytes)]
+pub struct CookieReply {
+    f_type: U32<LittleEndian>,
+    pub f_receiver: U32<LittleEndian>,
+    pub f_nonce: [u8; SIZE_NONCE],
+    pub f_cookie: [u8; SIZE_COOKIE],
+    pub f_cookie_tag: [u8; SIZE_TAG],
+}
+
+impl Default for Initiation {
+    fn default() -> Self {
+        Self {
+            f_type: <U32<LittleEndian>>::new(TYPE_INITIATION as u32),
+
+            f_sender: <U32<LittleEndian>>::ZERO,
+            f_ephemeral: [0u8; SIZE_X25519_POINT],
+            f_static: [0u8; SIZE_X25519_POINT],
+            f_static_tag: [0u8; SIZE_TAG],
+            f_timestamp: timestamp::ZERO,
+            f_timestamp_tag: [0u8; SIZE_TAG],
+            f_macs: Default::default(),
+        }
+    }
+}
+
+impl Initiation {
+    pub fn parse<B: ByteSlice>(bytes: B) -> Result<LayoutVerified<B, Self>, HandshakeError> {
+        let msg: LayoutVerified<B, Self> =
+            LayoutVerified::new(bytes).ok_or(HandshakeError::InvalidMessageFormat)?;
+
+        if msg.f_type.get() != (TYPE_INITIATION as u32) {
+            return Err(HandshakeError::InvalidMessageFormat);
+        }
+
+        Ok(msg)
+    }
+}
+
+#[cfg(test)]
+impl fmt::Debug for Initiation {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f,
+            "MessageInitiation {{ type = {}, sender = {}, ephemeral = {}, static = {}|{}, timestamp = {}|{} }}",
+            self.f_type.get(),
+            self.f_sender.get(),
+            hex::encode(self.f_ephemeral),
+            hex::encode(self.f_static),
+            hex::encode(self.f_static_tag),
+            hex::encode(self.f_timestamp),
+            hex::encode(self.f_timestamp_tag)
+        )
+    }
+}
+
+#[cfg(test)]
+impl PartialEq for Initiation {
+    fn eq(&self, other: &Self) -> bool {
+        self.f_type.get() == other.f_type.get()
+            && self.f_sender.get() == other.f_sender.get()
+            && self.f_ephemeral[..] == other.f_ephemeral[..]
+            && self.f_static[..] == other.f_static[..]
+            && self.f_static_tag[..] == other.f_static_tag[..]
+            && self.f_timestamp[..] == other.f_timestamp
+            && self.f_timestamp_tag[..] == other.f_timestamp_tag
+    }
+}
+
+#[cfg(test)]
+impl Eq for Initiation {}
+
+impl Response {
+    pub fn parse<B: ByteSlice>(bytes: B) -> Result<LayoutVerified<B, Self>, HandshakeError> {
+        let msg: LayoutVerified<B, Self> =
+            LayoutVerified::new(bytes).ok_or(HandshakeError::InvalidMessageFormat)?;
+
+        if msg.f_type.get() != (TYPE_RESPONSE as u32) {
+            return Err(HandshakeError::InvalidMessageFormat);
+        }
+
+        Ok(msg)
+    }
+}
+
+impl Default for Response {
+    fn default() -> Self {
+        Self {
+            f_type: <U32<LittleEndian>>::new(TYPE_RESPONSE as u32),
+            f_sender: <U32<LittleEndian>>::ZERO,
+            f_receiver: <U32<LittleEndian>>::ZERO,
+            f_ephemeral: [0u8; SIZE_X25519_POINT],
+            f_empty_tag: [0u8; SIZE_TAG],
+            f_macs: Default::default(),
+        }
+    }
+}
+
+#[cfg(test)]
+impl fmt::Debug for Response {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f,
+            "MessageResponse {{ type = {}, sender = {}, receiver = {}, ephemeral = {}, empty = |{}  }}",
+            self.f_type,
+            self.f_sender,
+            self.f_receiver,
+            hex::encode(self.f_ephemeral),
+            hex::encode(self.f_empty_tag)
+        )
+    }
+}
+
+#[cfg(test)]
+impl PartialEq for Response {
+    fn eq(&self, other: &Self) -> bool {
+        self.f_type == other.f_type
+            && self.f_sender == other.f_sender
+            && self.f_receiver == other.f_receiver
+            && self.f_ephemeral == other.f_ephemeral
+            && self.f_empty_tag == other.f_empty_tag
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn message_response_identity() {
+        let mut msg: Response = Default::default();
+
+        msg.f_sender.set(146252);
+        msg.f_receiver.set(554442);
+        msg.f_ephemeral = [
+            0xc1, 0x66, 0x0a, 0x0c, 0xdc, 0x0f, 0x6c, 0x51, 0x0f, 0xc2, 0xcc, 0x51, 0x52, 0x0c,
+            0xde, 0x1e, 0xf7, 0xf1, 0xca, 0x90, 0x86, 0x72, 0xad, 0x67, 0xea, 0x89, 0x45, 0x44,
+            0x13, 0x56, 0x52, 0x1f,
+        ];
+        msg.f_empty_tag = [
+            0x60, 0x0e, 0x1e, 0x95, 0x41, 0x6b, 0x52, 0x05, 0xa2, 0x09, 0xe1, 0xbf, 0x40, 0x05,
+            0x2f, 0xde,
+        ];
+        msg.f_macs.f_mac1 = [
+            0xf2, 0xad, 0x40, 0xb5, 0xf7, 0xde, 0x77, 0x35, 0x89, 0x19, 0xb7, 0x5c, 0xf9, 0x54,
+            0x69, 0x29,
+        ];
+        msg.f_macs.f_mac2 = [
+            0x4f, 0xd2, 0x1b, 0xfe, 0x77, 0xe6, 0x2e, 0xc9, 0x07, 0xe2, 0x87, 0x17, 0xbb, 0xe5,
+            0xdf, 0xbb,
+        ];
+
+        let buf: Vec<u8> = msg.as_bytes().to_vec();
+        let msg_p = Response::parse(&buf[..]).unwrap();
+        assert_eq!(msg, *msg_p.into_ref());
+    }
+
+    #[test]
+    fn message_initiate_identity() {
+        let mut msg: Initiation = Default::default();
+
+        msg.f_sender.set(575757);
+        msg.f_ephemeral = [
+            0xc1, 0x66, 0x0a, 0x0c, 0xdc, 0x0f, 0x6c, 0x51, 0x0f, 0xc2, 0xcc, 0x51, 0x52, 0x0c,
+            0xde, 0x1e, 0xf7, 0xf1, 0xca, 0x90, 0x86, 0x72, 0xad, 0x67, 0xea, 0x89, 0x45, 0x44,
+            0x13, 0x56, 0x52, 0x1f,
+        ];
+        msg.f_static = [
+            0xdc, 0x33, 0x90, 0x15, 0x8f, 0x82, 0x3e, 0x06, 0x44, 0xa0, 0xde, 0x4c, 0x15, 0x6c,
+            0x5d, 0xa4, 0x65, 0x99, 0xf6, 0x6c, 0xa1, 0x14, 0x77, 0xf9, 0xeb, 0x6a, 0xec, 0xc3,
+            0x3c, 0xda, 0x47, 0xe1,
+        ];
+        msg.f_static_tag = [
+            0x45, 0xac, 0x8d, 0x43, 0xea, 0x1b, 0x2f, 0x02, 0x45, 0x5d, 0x86, 0x37, 0xee, 0x83,
+            0x6b, 0x42,
+        ];
+        msg.f_timestamp = [
+            0x4f, 0x1c, 0x60, 0xec, 0x0e, 0xf6, 0x36, 0xf0, 0x78, 0x28, 0x57, 0x42,
+        ];
+        msg.f_timestamp_tag = [
+            0x60, 0x0e, 0x1e, 0x95, 0x41, 0x6b, 0x52, 0x05, 0xa2, 0x09, 0xe1, 0xbf, 0x40, 0x05,
+            0x2f, 0xde,
+        ];
+        msg.f_macs.f_mac1 = [
+            0xf2, 0xad, 0x40, 0xb5, 0xf7, 0xde, 0x77, 0x35, 0x89, 0x19, 0xb7, 0x5c, 0xf9, 0x54,
+            0x69, 0x29,
+        ];
+        msg.f_macs.f_mac2 = [
+            0x4f, 0xd2, 0x1b, 0xfe, 0x77, 0xe6, 0x2e, 0xc9, 0x07, 0xe2, 0x87, 0x17, 0xbb, 0xe5,
+            0xdf, 0xbb,
+        ];
+
+        let buf: Vec<u8> = msg.as_bytes().to_vec();
+        let msg_p = Initiation::parse(&buf[..]).unwrap();
+        assert_eq!(msg, *msg_p.into_ref());
+    }
+}