1 files changed, 54 insertions, 0 deletions
diff --git a/src/machine.rs b/src/machine.rs
new file mode 100644
index 0000000..a9a3904
--- /dev/null
+++ b/src/machine.rs
@@ -0,0 +1,54 @@
+use x25519_dalek::PublicKey;
+use x25519_dalek::StaticSecret;
+use x25519_dalek::SharedSecret;
+
+/* Mutable part of handshake state */
+enum StateMutable {
+    Reset,
+    InitiationSent,
+    InitiationProcessed,
+    ReponseSent
+}
+
+/* Immutable part of the handshake state */
+struct StateFixed {
+    sk : StaticSecret,
+    pk : PublicKey,
+    ss : SharedSecret
+}
+
+struct State {
+    m : StateMutable,
+    f : StateFixed,
+}
+
+struct KeyPair {
+    send : [u8; 32],
+    recv : [u8; 32]
+}
+
+impl State {
+    /* Initialize a new handshake state machine
+     */
+    fn new(sk : StaticSecret, pk : PublicKey) -> State {
+        let ss = sk.diffie_hellman(&pk);
+        State {
+            m : StateMutable::Reset,
+            f : StateFixed{sk, pk, ss}
+        }
+    }
+
+    /* Begin a new handshake, returns the initial handshake message
+     */
+    fn begin(&self) -> Vec<u8> {
+        vec![]
+    }
+
+    /* Process a handshake message.
+     *
+     * Result is either a new state (and optionally a new key pair) or an error
+     */
+    fn process(&self, msg : &[u8]) -> Result<(State, Option<KeyPair>), ()> {
+        Err(())
+    }
+}