From 31124decc2d24a85456406e87d8cdd6081c3144b Mon Sep 17 00:00:00 2001
From: moana <moana@dusk.network>
Date: Mon, 12 Aug 2024 16:55:05 +0200
Subject: [PATCH] circuits: Add rkyv serialization for the circuit types

---
 .github/workflows/dusk_ci.yml |  2 +-
 circuits/CHANGELOG.md         |  3 +++
 circuits/Cargo.toml           |  9 +++++++++
 circuits/src/lib.rs           | 18 ++++++++++++++++++
 4 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/dusk_ci.yml b/.github/workflows/dusk_ci.yml
index 3b0b3b2..c443367 100644
--- a/.github/workflows/dusk_ci.yml
+++ b/.github/workflows/dusk_ci.yml
@@ -40,4 +40,4 @@ jobs:
     name: test cirucits no-default-features
     uses: dusk-network/.github/.github/workflows/run-tests.yml@main
     with:
-      test_flags: -p phoenix-circuits --no-default-features
+      test_flags: -p phoenix-circuits --no-default-features --features=rkyv-impl --no-run
diff --git a/circuits/CHANGELOG.md b/circuits/CHANGELOG.md
index 00d7431..bdf9b64 100644
--- a/circuits/CHANGELOG.md
+++ b/circuits/CHANGELOG.md
@@ -37,6 +37,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `dusk-bls12_381` dependency [#235]
 - Add `"plonk"` feature to add the `dusk-plonk` dependency [#235]
 - Add `"plonk"` feature as default feature [#235]
+- Add `"rkyv-impl"` feature
+- Add rkyv dependencies behind `rkyv-impl` feature
+- Add rkyv derives for `TxCircuit`, `InputNoteInfo` and `OutputNoteInfo`
 
 ## [0.2.1] - 2024-07-03
 
diff --git a/circuits/Cargo.toml b/circuits/Cargo.toml
index bb491c1..25850a4 100644
--- a/circuits/Cargo.toml
+++ b/circuits/Cargo.toml
@@ -17,6 +17,8 @@ dusk-jubjub = { version = "0.14", default-features = false }
 poseidon-merkle = { version = "0.6" }
 dusk-poseidon = { version = "0.39" }
 jubjub-schnorr = { version = "0.4" }
+rkyv = { version = "0.7", default-features = false, optional = true }
+bytecheck = { version = "0.6", default-features = false, optional = true }
 dusk-plonk = { version = "0.19", default-features = false, optional = true }
 
 [dev-dependencies]
@@ -32,3 +34,10 @@ plonk = [
     "dusk-poseidon/zk",
     "jubjub-schnorr/zk",
 ]
+rkyv-impl = [
+    "dusk-jubjub/rkyv-impl",
+    "jubjub-schnorr/rkyv-impl",
+    "dusk-bls12_381/rkyv-impl",
+    "rkyv",
+    "bytecheck"
+]
diff --git a/circuits/src/lib.rs b/circuits/src/lib.rs
index 45c32b9..a0aebad 100644
--- a/circuits/src/lib.rs
+++ b/circuits/src/lib.rs
@@ -27,6 +27,9 @@ use dusk_jubjub::{JubJubAffine, JubJubScalar};
 use jubjub_schnorr::{Signature as SchnorrSignature, SignatureDouble};
 use poseidon_merkle::{Item, Opening, Tree, ARITY};
 
+#[cfg(feature = "rkyv-impl")]
+use rkyv::{Archive, Deserialize, Serialize};
+
 use phoenix_core::{Note, PublicKey, SecretKey, OUTPUT_NOTES};
 
 extern crate alloc;
@@ -34,6 +37,11 @@ use alloc::vec::Vec;
 
 /// Declaration of the transaction circuit calling the [`gadget`].
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(
+    feature = "rkyv-impl",
+    derive(Archive, Serialize, Deserialize),
+    archive_attr(derive(bytecheck::CheckBytes))
+)]
 pub struct TxCircuit<const H: usize, const I: usize> {
     /// All information needed in relation to the transaction input-notes
     pub input_notes_info: [InputNoteInfo<H>; I],
@@ -201,6 +209,11 @@ impl<const H: usize, const I: usize> Default for TxCircuit<H, I> {
 /// Struct holding all information needed by the transfer circuit regarding the
 /// transaction input-notes.
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(
+    feature = "rkyv-impl",
+    derive(Archive, Serialize, Deserialize),
+    archive_attr(derive(bytecheck::CheckBytes))
+)]
 pub struct InputNoteInfo<const H: usize> {
     /// The merkle opening for the note
     pub merkle_opening: Opening<(), H>,
@@ -291,6 +304,11 @@ impl<const H: usize> InputNoteInfo<H> {
 /// Struct holding all information needed by the transfer circuit regarding the
 /// transaction output-notes.
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(
+    feature = "rkyv-impl",
+    derive(Archive, Serialize, Deserialize),
+    archive_attr(derive(bytecheck::CheckBytes))
+)]
 pub struct OutputNoteInfo {
     /// The value of the note
     pub value: u64,