silence-laboratories · sushisilence · Mar 10, 2024 · Mar 10, 2024 · Mar 10, 2024
diff --git a/Cargo.toml b/Cargo.toml
@@ -1,9 +1,10 @@
 [workspace]
 resolver = "2"
 members = [
-        "crates/sl-mpc-mate",
-        "crates/sl-oblivious",
-        "crates/sl-paillier"
+  "crates/sl-mpc-mate",
+  "crates/sl-oblivious",
+  "crates/sl-paillier",
+  "crates/sl-mpc-traits",
 ]
 
 [profile.bench]

diff --git a/crates/sl-mpc-traits/Cargo.toml b/crates/sl-mpc-traits/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "sl-mpc-traits"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bincode = { version = "1", optional = true }
+serde = { version = "1.0", default-features = false, features = [
+  "derive",
+], optional = true }
+
+[features]
+default = []
+serde = ["dep:serde", "dep:bincode"]
diff --git a/crates/sl-mpc-traits/src/lib.rs b/crates/sl-mpc-traits/src/lib.rs
@@ -0,0 +1,28 @@
+/// Trait that defines a state transition for any round based protocol.
+pub trait Round {
+    /// Output of the state transition.
+    type Output;
+    /// Input of the state transition.
+    type Input;
+    /// Transition to the next state.
+    fn process(self, messages: Self::Input) -> Self::Output;
+}
+
+#[cfg(feature = "serde")]
+use serde::{de::DeserializeOwned, Serialize};
+
+#[cfg(feature = "serde")]
+/// Trait that signifies a persistent object.
+/// Encoded using bincode.
+pub trait PersistentObject:
+    Serialize + DeserializeOwned + Send + 'static
+{
+    /// Serialize the object into bytes.
+    fn to_bytes(&self) -> Option<Vec<u8>> {
+        bincode::serialize(self).ok()
+    }
+    /// Deserialize the object from bytes.
+    fn from_bytes(bytes: &[u8]) -> Option<Self> {
+        bincode::deserialize(bytes).ok()
+    }
+}