enable our chain extension

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

parachain-runtime/Cargo.toml

@@ -76,6 +76,10 @@ pallet-contracts-primitives = { workspace = true }
 pallet-insecure-randomness-collective-flip = { workspace = true }
 pallet-assets = { workspace = true }
 
+# Chain extension
+bn = { workspace = true, default-features = false }
+ff_wasm_unknown_unknown = { workspace = true, features = ["derive"] }
+
 [features]
 default = [
 	"std",

runtime/Cargo.toml

@@ -53,8 +53,8 @@ pallet-insecure-randomness-collective-flip = { workspace = true }
 pallet-assets = { workspace = true }
 
 # Chain extension
-bn = { package = "substrate-bn", version = "0.6", default-features = false }
-ff_wasm_unknown_unknown = { features = ["derive"], version = "0.12.2" }
+bn = { workspace = true, default-features = false }
+ff_wasm_unknown_unknown = { workspace = true, features = ["derive"] }
 
 # Used for the node template's RPCs
 frame-system-rpc-runtime-api = { workspace = true }

runtime/src/chain_ext.rs

@@ -8,8 +8,8 @@ use pallet_contracts::chain_extension::{
 use sp_core::crypto::UncheckedFrom;
 use sp_runtime::DispatchError;
 
-use super::Randomness;
 use crate::{mimc::mimc_feistel, Runtime};
+use frame_support::traits::Randomness;
 
 pub(crate) enum InvalidArgument {
 	NotInField = 1,

runtime/src/contracts_config.rs

@@ -61,7 +61,7 @@ impl pallet_contracts::Config for Runtime {
 	type CallStack = [pallet_contracts::Frame<Self>; 23];
 	type WeightPrice = pallet_transaction_payment::Pallet<Self>;
 	type WeightInfo = pallet_contracts::weights::SubstrateWeight<Self>;
-	type ChainExtension = ();
+	type ChainExtension = crate::chain_ext::FetchRandomExtension;
 	type Schedule = Schedule;
 	type AddressGenerator = pallet_contracts::DefaultAddressGenerator;
 	// This node is geared towards development and testing of contracts.

runtime/src/lib.rs

@@ -9,6 +9,10 @@ include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
 mod assets_config;
 mod contracts_config;
 
+mod bn128;
+mod chain_ext;
+mod mimc;
+
 use frame_support::dispatch::DispatchClass;
 use frame_system::limits::{BlockLength, BlockWeights};
 use polkadot_runtime_common::SlowAdjustingFeeUpdate;