Associated type Hasher for QueryPreimage, StorePreimage and Bounded (#1720)

I hope it's enough to fix #1701 
the only solution I found to make it happen is to put an associated type
to the `Bounded` enum as well.
@liamaharon @kianenigma @bkchr 

Polkadot address: 12poSUQPtcF1HUPQGY3zZu2P8emuW9YnsPduA4XG3oCEfJVp

---------

Signed-off-by: muraca <mmuraca247@gmail.com>
Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

substrate/frame/democracy/src/benchmarking.rs

@@ -25,7 +25,6 @@ use frame_support::{
 	traits::{Currency, EnsureOrigin, Get, OnInitialize, UnfilteredDispatchable},
 };
 use frame_system::{pallet_prelude::BlockNumberFor, RawOrigin};
-use sp_core::H256;
 use sp_runtime::{traits::Bounded, BoundedVec};
 
 use crate::Pallet as Democracy;
@@ -46,7 +45,7 @@ fn make_proposal<T: Config>(n: u32) -> BoundedCallOf<T> {
 	<T as Config>::Preimages::bound(call).unwrap()
 }
 
-fn add_proposal<T: Config>(n: u32) -> Result<H256, &'static str> {
+fn add_proposal<T: Config>(n: u32) -> Result<T::Hash, &'static str> {
 	let other = funded_account::<T>("proposer", n);
 	let value = T::MinimumDeposit::get();
 	let proposal = make_proposal::<T>(n);
@@ -55,7 +54,7 @@ fn add_proposal<T: Config>(n: u32) -> Result<H256, &'static str> {
 }
 
 // add a referendum with a metadata.
-fn add_referendum<T: Config>(n: u32) -> (ReferendumIndex, H256, PreimageHash) {
+fn add_referendum<T: Config>(n: u32) -> (ReferendumIndex, T::Hash, T::Hash) {
 	let vote_threshold = VoteThreshold::SimpleMajority;
 	let proposal = make_proposal::<T>(n);
 	let hash = proposal.hash();
@@ -85,7 +84,7 @@ fn assert_has_event<T: Config>(generic_event: <T as Config>::RuntimeEvent) {
 }
 
 // note a new preimage.
-fn note_preimage<T: Config>() -> PreimageHash {
+fn note_preimage<T: Config>() -> T::Hash {
 	use core::sync::atomic::{AtomicU8, Ordering};
 	use sp_std::borrow::Cow;
 	// note a new preimage on every function invoke.

substrate/frame/democracy/src/lib.rs

@@ -159,9 +159,8 @@ use frame_support::{
 	traits::{
 		defensive_prelude::*,
 		schedule::{v3::Named as ScheduleNamed, DispatchTime},
-		Bounded, Currency, EnsureOrigin, Get, Hash as PreimageHash, LockIdentifier,
-		LockableCurrency, OnUnbalanced, QueryPreimage, ReservableCurrency, StorePreimage,
-		WithdrawReasons,
+		Bounded, Currency, EnsureOrigin, Get, LockIdentifier, LockableCurrency, OnUnbalanced,
+		QueryPreimage, ReservableCurrency, StorePreimage, WithdrawReasons,
 	},
 	weights::Weight,
 };
@@ -203,7 +202,7 @@ type NegativeImbalanceOf<T> = <<T as Config>::Currency as Currency<
 	<T as frame_system::Config>::AccountId,
 >>::NegativeImbalance;
 pub type CallOf<T> = <T as frame_system::Config>::RuntimeCall;
-pub type BoundedCallOf<T> = Bounded<CallOf<T>>;
+pub type BoundedCallOf<T> = Bounded<CallOf<T>, <T as frame_system::Config>::Hashing>;
 type AccountIdLookupOf<T> = <<T as frame_system::Config>::Lookup as StaticLookup>::Source;
 
 #[frame_support::pallet]
@@ -211,7 +210,6 @@ pub mod pallet {
 	use super::{DispatchResult, *};
 	use frame_support::pallet_prelude::*;
 	use frame_system::pallet_prelude::*;
-	use sp_core::H256;
 
 	/// The current storage version.
 	const STORAGE_VERSION: StorageVersion = StorageVersion::new(1);
@@ -226,10 +224,15 @@ pub mod pallet {
 		type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
 
 		/// The Scheduler.
-		type Scheduler: ScheduleNamed<BlockNumberFor<Self>, CallOf<Self>, Self::PalletsOrigin>;
+		type Scheduler: ScheduleNamed<
+			BlockNumberFor<Self>,
+			CallOf<Self>,
+			Self::PalletsOrigin,
+			Hasher = Self::Hashing,
+		>;
 
 		/// The Preimage provider.
-		type Preimages: QueryPreimage + StorePreimage;
+		type Preimages: QueryPreimage<H = Self::Hashing> + StorePreimage;
 
 		/// Currency type for this pallet.
 		type Currency: ReservableCurrency<Self::AccountId>
@@ -421,22 +424,22 @@ pub mod pallet {
 	pub type Blacklist<T: Config> = StorageMap<
 		_,
 		Identity,
-		H256,
+		T::Hash,
 		(BlockNumberFor<T>, BoundedVec<T::AccountId, T::MaxBlacklisted>),
 	>;
 
 	/// Record of all proposals that have been subject to emergency cancellation.
 	#[pallet::storage]
-	pub type Cancellations<T: Config> = StorageMap<_, Identity, H256, bool, ValueQuery>;
+	pub type Cancellations<T: Config> = StorageMap<_, Identity, T::Hash, bool, ValueQuery>;
 
 	/// General information concerning any proposal or referendum.
-	/// The `PreimageHash` refers to the preimage of the `Preimages` provider which can be a JSON
+	/// The `Hash` refers to the preimage of the `Preimages` provider which can be a JSON
 	/// dump or IPFS hash of a JSON file.
 	///
 	/// Consider a garbage collection for a metadata of finished referendums to `unrequest` (remove)
 	/// large preimages.
 	#[pallet::storage]
-	pub type MetadataOf<T: Config> = StorageMap<_, Blake2_128Concat, MetadataOwner, PreimageHash>;
+	pub type MetadataOf<T: Config> = StorageMap<_, Blake2_128Concat, MetadataOwner, T::Hash>;
 
 	#[pallet::genesis_config]
 	#[derive(frame_support::DefaultNoBound)]
@@ -476,9 +479,9 @@ pub mod pallet {
 		/// An account has cancelled a previous delegation operation.
 		Undelegated { account: T::AccountId },
 		/// An external proposal has been vetoed.
-		Vetoed { who: T::AccountId, proposal_hash: H256, until: BlockNumberFor<T> },
+		Vetoed { who: T::AccountId, proposal_hash: T::Hash, until: BlockNumberFor<T> },
 		/// A proposal_hash has been blacklisted permanently.
-		Blacklisted { proposal_hash: H256 },
+		Blacklisted { proposal_hash: T::Hash },
 		/// An account has voted in a referendum
 		Voted { voter: T::AccountId, ref_index: ReferendumIndex, vote: AccountVote<BalanceOf<T>> },
 		/// An account has secconded a proposal
@@ -490,14 +493,14 @@ pub mod pallet {
 			/// Metadata owner.
 			owner: MetadataOwner,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 		/// Metadata for a proposal or a referendum has been cleared.
 		MetadataCleared {
 			/// Metadata owner.
 			owner: MetadataOwner,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 		/// Metadata has been transferred to new owner.
 		MetadataTransferred {
@@ -506,7 +509,7 @@ pub mod pallet {
 			/// New metadata owner.
 			owner: MetadataOwner,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 	}
 
@@ -775,7 +778,7 @@ pub mod pallet {
 		#[pallet::weight(T::WeightInfo::fast_track())]
 		pub fn fast_track(
 			origin: OriginFor<T>,
-			proposal_hash: H256,
+			proposal_hash: T::Hash,
 			voting_period: BlockNumberFor<T>,
 			delay: BlockNumberFor<T>,
 		) -> DispatchResult {
@@ -827,7 +830,7 @@ pub mod pallet {
 		/// Weight: `O(V + log(V))` where V is number of `existing vetoers`
 		#[pallet::call_index(8)]
 		#[pallet::weight(T::WeightInfo::veto_external())]
-		pub fn veto_external(origin: OriginFor<T>, proposal_hash: H256) -> DispatchResult {
+		pub fn veto_external(origin: OriginFor<T>, proposal_hash: T::Hash) -> DispatchResult {
 			let who = T::VetoOrigin::ensure_origin(origin)?;
 
 			if let Some((ext_proposal, _)) = NextExternal::<T>::get() {
@@ -1042,7 +1045,7 @@ pub mod pallet {
 		#[pallet::weight((T::WeightInfo::blacklist(), DispatchClass::Operational))]
 		pub fn blacklist(
 			origin: OriginFor<T>,
-			proposal_hash: H256,
+			proposal_hash: T::Hash,
 			maybe_ref_index: Option<ReferendumIndex>,
 		) -> DispatchResult {
 			T::BlacklistOrigin::ensure_origin(origin)?;
@@ -1139,7 +1142,7 @@ pub mod pallet {
 		pub fn set_metadata(
 			origin: OriginFor<T>,
 			owner: MetadataOwner,
-			maybe_hash: Option<PreimageHash>,
+			maybe_hash: Option<T::Hash>,
 		) -> DispatchResult {
 			match owner {
 				MetadataOwner::External => {
@@ -1173,15 +1176,16 @@ pub mod pallet {
 }
 
 pub trait EncodeInto: Encode {
-	fn encode_into<T: AsMut<[u8]> + Default>(&self) -> T {
+	fn encode_into<T: AsMut<[u8]> + Default, H: sp_core::Hasher>(&self) -> T {
 		let mut t = T::default();
 		self.using_encoded(|data| {
 			if data.len() <= t.as_mut().len() {
 				t.as_mut()[0..data.len()].copy_from_slice(data);
 			} else {
-				// encoded self is too big to fit into a T. hash it and use the first bytes of that
-				// instead.
-				let hash = sp_io::hashing::blake2_256(data);
+				// encoded self is too big to fit into a T.
+				// hash it and use the first bytes of that instead.
+				let hash = H::hash(&data);
+				let hash = hash.as_ref();
 				let l = t.as_mut().len().min(hash.len());
 				t.as_mut()[0..l].copy_from_slice(&hash[0..l]);
 			}
@@ -1610,7 +1614,7 @@ impl<T: Config> Pallet<T> {
 			// Earliest it can be scheduled for is next block.
 			let when = now.saturating_add(status.delay.max(One::one()));
 			if T::Scheduler::schedule_named(
-				(DEMOCRACY_ID, index).encode_into(),
+				(DEMOCRACY_ID, index).encode_into::<_, T::Hashing>(),
 				DispatchTime::At(when),
 				None,
 				63,

substrate/frame/democracy/src/tests.rs

@@ -277,7 +277,7 @@ fn tally(r: ReferendumIndex) -> Tally<u64> {
 }
 
 /// note a new preimage without registering.
-fn note_preimage(who: u64) -> PreimageHash {
+fn note_preimage(who: u64) -> <Test as frame_system::Config>::Hash {
 	use std::sync::atomic::{AtomicU8, Ordering};
 	// note a new preimage on every function invoke.
 	static COUNTER: AtomicU8 = AtomicU8::new(0);

substrate/frame/democracy/src/tests/metadata.rs

@@ -22,9 +22,8 @@ use super::*;
 #[test]
 fn set_external_metadata_works() {
 	new_test_ext().execute_with(|| {
-		use frame_support::traits::Hash as PreimageHash;
 		// invalid preimage hash.
-		let invalid_hash: PreimageHash = [1u8; 32].into();
+		let invalid_hash: <Test as frame_system::Config>::Hash = [1u8; 32].into();
 		// metadata owner is an external proposal.
 		let owner = MetadataOwner::External;
 		// fails to set metadata if an external proposal does not exist.
@@ -83,9 +82,8 @@ fn clear_metadata_works() {
 #[test]
 fn set_proposal_metadata_works() {
 	new_test_ext().execute_with(|| {
-		use frame_support::traits::Hash as PreimageHash;
 		// invalid preimage hash.
-		let invalid_hash: PreimageHash = [1u8; 32].into();
+		let invalid_hash: <Test as frame_system::Config>::Hash = [1u8; 32].into();
 		// create an external proposal.
 		assert_ok!(propose_set_balance(1, 2, 5));
 		// metadata owner is a public proposal.

substrate/frame/preimage/src/lib.rs

@@ -49,8 +49,8 @@ use frame_support::{
 	ensure,
 	pallet_prelude::Get,
 	traits::{
-		Consideration, Currency, Defensive, FetchResult, Footprint, Hash as PreimageHash,
-		PreimageProvider, PreimageRecipient, QueryPreimage, ReservableCurrency, StorePreimage,
+		Consideration, Currency, Defensive, FetchResult, Footprint, PreimageProvider,
+		PreimageRecipient, QueryPreimage, ReservableCurrency, StorePreimage,
 	},
 	BoundedSlice, BoundedVec,
 };
@@ -531,7 +531,9 @@ impl<T: Config> PreimageRecipient<T::Hash> for Pallet<T> {
 	}
 }
 
-impl<T: Config<Hash = PreimageHash>> QueryPreimage for Pallet<T> {
+impl<T: Config> QueryPreimage for Pallet<T> {
+	type H = T::Hashing;
+
 	fn len(hash: &T::Hash) -> Option<u32> {
 		Pallet::<T>::len(hash)
 	}
@@ -555,7 +557,7 @@ impl<T: Config<Hash = PreimageHash>> QueryPreimage for Pallet<T> {
 	}
 }
 
-impl<T: Config<Hash = PreimageHash>> StorePreimage for Pallet<T> {
+impl<T: Config> StorePreimage for Pallet<T> {
 	const MAX_LENGTH: usize = MAX_SIZE as usize;
 
 	fn note(bytes: Cow<[u8]>) -> Result<T::Hash, DispatchError> {

substrate/frame/preimage/src/tests.rs

@@ -24,25 +24,32 @@ use crate::mock::*;
 
 use frame_support::{
 	assert_err, assert_noop, assert_ok, assert_storage_noop,
-	traits::{fungible::InspectHold, Bounded, BoundedInline, Hash as PreimageHash},
+	traits::{fungible::InspectHold, Bounded, BoundedInline},
 	StorageNoopGuard,
 };
-use sp_core::{blake2_256, H256};
 use sp_runtime::{bounded_vec, TokenError};
 
 /// Returns one `Inline`, `Lookup` and `Legacy` item each with different data and hash.
-pub fn make_bounded_values() -> (Bounded<Vec<u8>>, Bounded<Vec<u8>>, Bounded<Vec<u8>>) {
+pub fn make_bounded_values() -> (
+	Bounded<Vec<u8>, <Test as frame_system::Config>::Hashing>,
+	Bounded<Vec<u8>, <Test as frame_system::Config>::Hashing>,
+	Bounded<Vec<u8>, <Test as frame_system::Config>::Hashing>,
+) {
 	let data: BoundedInline = bounded_vec![1];
-	let inline = Bounded::<Vec<u8>>::Inline(data);
+	let inline = Bounded::<Vec<u8>, <Test as frame_system::Config>::Hashing>::Inline(data);
 
 	let data = vec![1, 2];
-	let hash: H256 = blake2_256(&data[..]).into();
+	let hash = <Test as frame_system::Config>::Hashing::hash(&data[..]).into();
 	let len = data.len() as u32;
-	let lookup = Bounded::<Vec<u8>>::unrequested(hash, len);
+	let lookup =
+		Bounded::<Vec<u8>, <Test as frame_system::Config>::Hashing>::unrequested(hash, len);
 
 	let data = vec![1, 2, 3];
-	let hash: H256 = blake2_256(&data[..]).into();
-	let legacy = Bounded::<Vec<u8>>::Legacy { hash, dummy: Default::default() };
+	let hash = <Test as frame_system::Config>::Hashing::hash(&data[..]).into();
+	let legacy = Bounded::<Vec<u8>, <Test as frame_system::Config>::Hashing>::Legacy {
+		hash,
+		dummy: Default::default(),
+	};
 
 	(inline, lookup, legacy)
 }
@@ -303,7 +310,7 @@ fn query_and_store_preimage_workflow() {
 		let bound = Preimage::bound(data.clone()).unwrap();
 		let (len, hash) = (bound.len().unwrap(), bound.hash());
 
-		assert_eq!(hash, blake2_256(&encoded).into());
+		assert_eq!(hash, <Test as frame_system::Config>::Hashing::hash(&encoded).into());
 		assert_eq!(bound.len(), Some(len));
 		assert!(bound.lookup_needed(), "Should not be Inlined");
 		assert_eq!(bound.lookup_len(), Some(len));
@@ -364,7 +371,7 @@ fn query_preimage_request_works() {
 	new_test_ext().execute_with(|| {
 		let _guard = StorageNoopGuard::default();
 		let data: Vec<u8> = vec![1; 10];
-		let hash: PreimageHash = blake2_256(&data[..]).into();
+		let hash = <Test as frame_system::Config>::Hashing::hash(&data[..]).into();
 
 		// Request the preimage.
 		<Preimage as QueryPreimage>::request(&hash);
@@ -454,7 +461,7 @@ fn store_preimage_basic_works() {
 
 		// Cleanup.
 		<Preimage as StorePreimage>::unnote(&bound.hash());
-		let data_hash = blake2_256(&data);
+		let data_hash = <Test as frame_system::Config>::Hashing::hash(&data);
 		<Preimage as StorePreimage>::unnote(&data_hash.into());
 
 		// No storage changes remain. Checked by `StorageNoopGuard`.

substrate/frame/referenda/src/benchmarking.rs

@@ -25,7 +25,7 @@ use frame_benchmarking::v1::{
 };
 use frame_support::{
 	assert_ok,
-	traits::{Bounded, Currency, EnsureOrigin, EnsureOriginWithArg, UnfilteredDispatchable},
+	traits::{Currency, EnsureOrigin, EnsureOriginWithArg, UnfilteredDispatchable},
 };
 use frame_system::RawOrigin;
 use sp_runtime::traits::Bounded as ArithBounded;
@@ -42,7 +42,7 @@ fn funded_account<T: Config<I>, I: 'static>(name: &'static str, index: u32) -> T
 	caller
 }
 
-fn dummy_call<T: Config<I>, I: 'static>() -> Bounded<<T as Config<I>>::RuntimeCall> {
+fn dummy_call<T: Config<I>, I: 'static>() -> BoundedCallOf<T, I> {
 	let inner = frame_system::Call::remark { remark: vec![] };
 	let call = <T as Config<I>>::RuntimeCall::from(inner);
 	T::Preimages::bound(call).unwrap()

substrate/frame/referenda/src/lib.rs

@@ -73,8 +73,8 @@ use frame_support::{
 			v3::{Anon as ScheduleAnon, Named as ScheduleNamed},
 			DispatchTime,
 		},
-		Currency, Hash as PreimageHash, LockIdentifier, OnUnbalanced, OriginTrait, PollStatus,
-		Polling, QueryPreimage, ReservableCurrency, StorePreimage, VoteTally,
+		Currency, LockIdentifier, OnUnbalanced, OriginTrait, PollStatus, Polling, QueryPreimage,
+		ReservableCurrency, StorePreimage, VoteTally,
 	},
 	BoundedVec,
 };
@@ -163,8 +163,17 @@ pub mod pallet {
 		/// Weight information for extrinsics in this pallet.
 		type WeightInfo: WeightInfo;
 		/// The Scheduler.
-		type Scheduler: ScheduleAnon<BlockNumberFor<Self>, CallOf<Self, I>, PalletsOriginOf<Self>>
-			+ ScheduleNamed<BlockNumberFor<Self>, CallOf<Self, I>, PalletsOriginOf<Self>>;
+		type Scheduler: ScheduleAnon<
+				BlockNumberFor<Self>,
+				CallOf<Self, I>,
+				PalletsOriginOf<Self>,
+				Hasher = Self::Hashing,
+			> + ScheduleNamed<
+				BlockNumberFor<Self>,
+				CallOf<Self, I>,
+				PalletsOriginOf<Self>,
+				Hasher = Self::Hashing,
+			>;
 		/// Currency type for this pallet.
 		type Currency: ReservableCurrency<Self::AccountId>;
 		// Origins and unbalances.
@@ -226,7 +235,7 @@ pub mod pallet {
 			>;
 
 		/// The preimage provider.
-		type Preimages: QueryPreimage + StorePreimage;
+		type Preimages: QueryPreimage<H = Self::Hashing> + StorePreimage;
 	}
 
 	/// The next free referendum index, aka the number of referenda started so far.
@@ -257,14 +266,14 @@ pub mod pallet {
 		StorageMap<_, Twox64Concat, TrackIdOf<T, I>, u32, ValueQuery>;
 
 	/// The metadata is a general information concerning the referendum.
-	/// The `PreimageHash` refers to the preimage of the `Preimages` provider which can be a JSON
+	/// The `Hash` refers to the preimage of the `Preimages` provider which can be a JSON
 	/// dump or IPFS hash of a JSON file.
 	///
 	/// Consider a garbage collection for a metadata of finished referendums to `unrequest` (remove)
 	/// large preimages.
 	#[pallet::storage]
 	pub type MetadataOf<T: Config<I>, I: 'static = ()> =
-		StorageMap<_, Blake2_128Concat, ReferendumIndex, PreimageHash>;
+		StorageMap<_, Blake2_128Concat, ReferendumIndex, T::Hash>;
 
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
@@ -376,14 +385,14 @@ pub mod pallet {
 			/// Index of the referendum.
 			index: ReferendumIndex,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 		/// Metadata for a referendum has been cleared.
 		MetadataCleared {
 			/// Index of the referendum.
 			index: ReferendumIndex,
 			/// Preimage hash.
-			hash: PreimageHash,
+			hash: T::Hash,
 		},
 	}
 
@@ -691,7 +700,7 @@ pub mod pallet {
 		pub fn set_metadata(
 			origin: OriginFor<T>,
 			index: ReferendumIndex,
-			maybe_hash: Option<PreimageHash>,
+			maybe_hash: Option<T::Hash>,
 		) -> DispatchResult {
 			let who = ensure_signed(origin)?;
 			if let Some(hash) = maybe_hash {

substrate/frame/referenda/src/mock.rs

@@ -473,7 +473,7 @@ impl RefState {
 }
 
 /// note a new preimage without registering.
-pub fn note_preimage(who: u64) -> PreimageHash {
+pub fn note_preimage(who: u64) -> <Test as frame_system::Config>::Hash {
 	use std::sync::atomic::{AtomicU8, Ordering};
 	// note a new preimage on every function invoke.
 	static COUNTER: AtomicU8 = AtomicU8::new(0);

substrate/frame/referenda/src/tests.rs

@@ -599,9 +599,8 @@ fn curve_handles_all_inputs() {
 #[test]
 fn set_metadata_works() {
 	ExtBuilder::default().build_and_execute(|| {
-		use frame_support::traits::Hash as PreimageHash;
 		// invalid preimage hash.
-		let invalid_hash: PreimageHash = [1u8; 32].into();
+		let invalid_hash: <Test as frame_system::Config>::Hash = [1u8; 32].into();
 		// fails to set metadata for a finished referendum.
 		assert_ok!(Referenda::submit(
 			RuntimeOrigin::signed(1),

substrate/frame/referenda/src/types.rs

@@ -34,7 +34,8 @@ pub type NegativeImbalanceOf<T, I> = <<T as Config<I>>::Currency as Currency<
 	<T as frame_system::Config>::AccountId,
 >>::NegativeImbalance;
 pub type CallOf<T, I> = <T as Config<I>>::RuntimeCall;
-pub type BoundedCallOf<T, I> = Bounded<<T as Config<I>>::RuntimeCall>;
+pub type BoundedCallOf<T, I> =
+	Bounded<<T as Config<I>>::RuntimeCall, <T as frame_system::Config>::Hashing>;
 pub type VotesOf<T, I> = <T as Config<I>>::Votes;
 pub type TallyOf<T, I> = <T as Config<I>>::Tally;
 pub type PalletsOriginOf<T> =

substrate/frame/scheduler/src/benchmarking.rs

@@ -82,13 +82,13 @@ fn make_task<T: Config>(
 	Scheduled { maybe_id, priority, call, maybe_periodic, origin, _phantom: PhantomData }
 }
 
-fn bounded<T: Config>(len: u32) -> Option<Bounded<<T as Config>::RuntimeCall>> {
+fn bounded<T: Config>(len: u32) -> Option<BoundedCallOf<T>> {
 	let call =
 		<<T as Config>::RuntimeCall>::from(SystemCall::remark { remark: vec![0; len as usize] });
 	T::Preimages::bound(call).ok()
 }
 
-fn make_call<T: Config>(maybe_lookup_len: Option<u32>) -> Bounded<<T as Config>::RuntimeCall> {
+fn make_call<T: Config>(maybe_lookup_len: Option<u32>) -> BoundedCallOf<T> {
 	let bound = BoundedInline::bound() as u32;
 	let mut len = match maybe_lookup_len {
 		Some(len) => len.min(T::Preimages::MAX_LENGTH as u32 - 2).max(bound) - 3,

substrate/frame/scheduler/src/lib.rs

@@ -91,8 +91,8 @@ use frame_support::{
 	ensure,
 	traits::{
 		schedule::{self, DispatchTime, MaybeHashed},
-		Bounded, CallerTrait, EnsureOrigin, Get, Hash as PreimageHash, IsType, OriginTrait,
-		PalletInfoAccess, PrivilegeCmp, QueryPreimage, StorageVersion, StorePreimage,
+		Bounded, CallerTrait, EnsureOrigin, Get, IsType, OriginTrait, PalletInfoAccess,
+		PrivilegeCmp, QueryPreimage, StorageVersion, StorePreimage,
 	},
 	weights::{Weight, WeightMeter},
 };
@@ -119,6 +119,9 @@ pub type TaskAddress<BlockNumber> = (BlockNumber, u32);
 pub type CallOrHashOf<T> =
 	MaybeHashed<<T as Config>::RuntimeCall, <T as frame_system::Config>::Hash>;
 
+pub type BoundedCallOf<T> =
+	Bounded<<T as Config>::RuntimeCall, <T as frame_system::Config>::Hashing>;
+
 #[cfg_attr(any(feature = "std", test), derive(PartialEq, Eq))]
 #[derive(Clone, RuntimeDebug, Encode, Decode)]
 struct ScheduledV1<Call, BlockNumber> {
@@ -165,7 +168,7 @@ pub type ScheduledV3Of<T> = ScheduledV3<
 
 pub type ScheduledOf<T> = Scheduled<
 	TaskName,
-	Bounded<<T as Config>::RuntimeCall>,
+	BoundedCallOf<T>,
 	BlockNumberFor<T>,
 	<T as Config>::PalletsOrigin,
 	<T as frame_system::Config>::AccountId,
@@ -254,7 +257,7 @@ pub mod pallet {
 		type WeightInfo: WeightInfo;
 
 		/// The preimage provider with which we look up call hashes to get the call.
-		type Preimages: QueryPreimage + StorePreimage;
+		type Preimages: QueryPreimage<H = Self::Hashing> + StorePreimage;
 	}
 
 	#[pallet::storage]
@@ -440,7 +443,7 @@ pub mod pallet {
 	}
 }
 
-impl<T: Config<Hash = PreimageHash>> Pallet<T> {
+impl<T: Config> Pallet<T> {
 	/// Migrate storage format from V1 to V4.
 	///
 	/// Returns the weight consumed by this migration.
@@ -627,7 +630,7 @@ impl<T: Config<Hash = PreimageHash>> Pallet<T> {
 										>(&bounded)
 										{
 											log::error!(
-												"Dropping undecodable call {}: {:?}",
+												"Dropping undecodable call {:?}: {:?}",
 												&h,
 												&err
 											);
@@ -695,7 +698,7 @@ impl<T: Config> Pallet<T> {
 				Option<
 					Scheduled<
 						TaskName,
-						Bounded<<T as Config>::RuntimeCall>,
+						BoundedCallOf<T>,
 						BlockNumberFor<T>,
 						OldOrigin,
 						T::AccountId,
@@ -797,7 +800,7 @@ impl<T: Config> Pallet<T> {
 		maybe_periodic: Option<schedule::Period<BlockNumberFor<T>>>,
 		priority: schedule::Priority,
 		origin: T::PalletsOrigin,
-		call: Bounded<<T as Config>::RuntimeCall>,
+		call: BoundedCallOf<T>,
 	) -> Result<TaskAddress<BlockNumberFor<T>>, DispatchError> {
 		let when = Self::resolve_time(when)?;
 
@@ -886,7 +889,7 @@ impl<T: Config> Pallet<T> {
 		maybe_periodic: Option<schedule::Period<BlockNumberFor<T>>>,
 		priority: schedule::Priority,
 		origin: T::PalletsOrigin,
-		call: Bounded<<T as Config>::RuntimeCall>,
+		call: BoundedCallOf<T>,
 	) -> Result<TaskAddress<BlockNumberFor<T>>, DispatchError> {
 		// ensure id it is unique
 		if Lookup::<T>::contains_key(&id) {
@@ -1191,8 +1194,8 @@ impl<T: Config> Pallet<T> {
 	}
 }
 
-impl<T: Config<Hash = PreimageHash>>
-	schedule::v2::Anon<BlockNumberFor<T>, <T as Config>::RuntimeCall, T::PalletsOrigin> for Pallet<T>
+impl<T: Config> schedule::v2::Anon<BlockNumberFor<T>, <T as Config>::RuntimeCall, T::PalletsOrigin>
+	for Pallet<T>
 {
 	type Address = TaskAddress<BlockNumberFor<T>>;
 	type Hash = T::Hash;
@@ -1225,8 +1228,8 @@ impl<T: Config<Hash = PreimageHash>>
 	}
 }
 
-impl<T: Config<Hash = PreimageHash>>
-	schedule::v2::Named<BlockNumberFor<T>, <T as Config>::RuntimeCall, T::PalletsOrigin> for Pallet<T>
+impl<T: Config> schedule::v2::Named<BlockNumberFor<T>, <T as Config>::RuntimeCall, T::PalletsOrigin>
+	for Pallet<T>
 {
 	type Address = TaskAddress<BlockNumberFor<T>>;
 	type Hash = T::Hash;
@@ -1270,13 +1273,14 @@ impl<T: Config> schedule::v3::Anon<BlockNumberFor<T>, <T as Config>::RuntimeCall
 	for Pallet<T>
 {
 	type Address = TaskAddress<BlockNumberFor<T>>;
+	type Hasher = T::Hashing;
 
 	fn schedule(
 		when: DispatchTime<BlockNumberFor<T>>,
 		maybe_periodic: Option<schedule::Period<BlockNumberFor<T>>>,
 		priority: schedule::Priority,
 		origin: T::PalletsOrigin,
-		call: Bounded<<T as Config>::RuntimeCall>,
+		call: BoundedCallOf<T>,
 	) -> Result<Self::Address, DispatchError> {
 		Self::do_schedule(when, maybe_periodic, priority, origin, call)
 	}
@@ -1308,6 +1312,7 @@ impl<T: Config> schedule::v3::Named<BlockNumberFor<T>, <T as Config>::RuntimeCal
 	for Pallet<T>
 {
 	type Address = TaskAddress<BlockNumberFor<T>>;
+	type Hasher = T::Hashing;
 
 	fn schedule_named(
 		id: TaskName,
@@ -1315,7 +1320,7 @@ impl<T: Config> schedule::v3::Named<BlockNumberFor<T>, <T as Config>::RuntimeCal
 		maybe_periodic: Option<schedule::Period<BlockNumberFor<T>>>,
 		priority: schedule::Priority,
 		origin: T::PalletsOrigin,
-		call: Bounded<<T as Config>::RuntimeCall>,
+		call: BoundedCallOf<T>,
 	) -> Result<Self::Address, DispatchError> {
 		Self::do_schedule_named(id, when, maybe_periodic, priority, origin, call)
 	}

substrate/frame/scheduler/src/migration.rs

@@ -83,7 +83,7 @@ pub mod v3 {
 	/// Migrate the scheduler pallet from V3 to V4.
 	pub struct MigrateToV4<T>(sp_std::marker::PhantomData<T>);
 
-	impl<T: Config<Hash = PreimageHash>> OnRuntimeUpgrade for MigrateToV4<T> {
+	impl<T: Config> OnRuntimeUpgrade for MigrateToV4<T> {
 		#[cfg(feature = "try-runtime")]
 		fn pre_upgrade() -> Result<Vec<u8>, TryRuntimeError> {
 			ensure!(StorageVersion::get::<Pallet<T>>() == 3, "Can only upgrade from version 3");

substrate/frame/scheduler/src/tests.rs

@@ -1019,7 +1019,7 @@ fn test_migrate_origin() {
 	new_test_ext().execute_with(|| {
 		for i in 0..3u64 {
 			let k = i.twox_64_concat();
-			let old: Vec<Option<Scheduled<[u8; 32], Bounded<RuntimeCall>, u64, u32, u64>>> = vec![
+			let old: Vec<Option<Scheduled<[u8; 32], BoundedCallOf<Test>, u64, u32, u64>>> = vec![
 				Some(Scheduled {
 					maybe_id: None,
 					priority: i as u8 + 10,

substrate/frame/support/src/traits.rs

@@ -107,7 +107,7 @@ mod voting;
 pub use voting::{ClassCountOf, PollStatus, Polling, VoteTally};
 
 mod preimages;
-pub use preimages::{Bounded, BoundedInline, FetchResult, Hash, QueryPreimage, StorePreimage};
+pub use preimages::{Bounded, BoundedInline, FetchResult, QueryPreimage, StorePreimage};
 
 mod messages;
 pub use messages::{

substrate/frame/support/src/traits/preimages.rs

@@ -15,16 +15,17 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Stuff for dealing with 32-byte hashed preimages.
+//! Stuff for dealing with hashed preimages.
 
 use codec::{Decode, Encode, EncodeLike, MaxEncodedLen};
 use scale_info::TypeInfo;
-use sp_core::{RuntimeDebug, H256};
-use sp_io::hashing::blake2_256;
-use sp_runtime::{traits::ConstU32, DispatchError};
+use sp_core::RuntimeDebug;
+use sp_runtime::{
+	traits::{ConstU32, Hash},
+	DispatchError,
+};
 use sp_std::borrow::Cow;
 
-pub type Hash = H256;
 pub type BoundedInline = crate::BoundedVec<u8, ConstU32<128>>;
 
 /// The maximum we expect a single legacy hash lookup to be.
@@ -32,29 +33,29 @@ const MAX_LEGACY_LEN: u32 = 1_000_000;
 
 #[derive(Encode, Decode, MaxEncodedLen, Clone, Eq, PartialEq, TypeInfo, RuntimeDebug)]
 #[codec(mel_bound())]
-pub enum Bounded<T> {
-	/// A Blake2 256 hash with no preimage length. We
-	/// do not support creation of this except for transitioning from legacy state.
-	/// In the future we will make this a pure `Dummy` item storing only the final `dummy` field.
-	Legacy { hash: Hash, dummy: sp_std::marker::PhantomData<T> },
+pub enum Bounded<T, H: Hash> {
+	/// A hash with no preimage length. We do not support creation of this except
+	/// for transitioning from legacy state. In the future we will make this a pure
+	/// `Dummy` item storing only the final `dummy` field.
+	Legacy { hash: H::Output, dummy: sp_std::marker::PhantomData<T> },
 	/// A an bounded `Call`. Its encoding must be at most 128 bytes.
 	Inline(BoundedInline),
-	/// A Blake2-256 hash of the call together with an upper limit for its size.
-	Lookup { hash: Hash, len: u32 },
+	/// A hash of the call together with an upper limit for its size.`
+	Lookup { hash: H::Output, len: u32 },
 }
 
-impl<T> Bounded<T> {
+impl<T, H: Hash> Bounded<T, H> {
 	/// Casts the wrapped type into something that encodes alike.
 	///
 	/// # Examples
 	/// ```
-	/// use frame_support::traits::Bounded;
+	/// use frame_support::{traits::Bounded, sp_runtime::traits::BlakeTwo256};
 	///
 	/// // Transmute from `String` to `&str`.
-	/// let x: Bounded<String> = Bounded::Inline(Default::default());
-	/// let _: Bounded<&str> = x.transmute();
+	/// let x: Bounded<String, BlakeTwo256> = Bounded::Inline(Default::default());
+	/// let _: Bounded<&str, BlakeTwo256> = x.transmute();
 	/// ```
-	pub fn transmute<S: Encode>(self) -> Bounded<S>
+	pub fn transmute<S: Encode>(self) -> Bounded<S, H>
 	where
 		T: Encode + EncodeLike<S>,
 	{
@@ -69,18 +70,18 @@ impl<T> Bounded<T> {
 	/// Returns the hash of the preimage.
 	///
 	/// The hash is re-calculated every time if the preimage is inlined.
-	pub fn hash(&self) -> Hash {
+	pub fn hash(&self) -> H::Output {
 		use Bounded::*;
 		match self {
 			Lookup { hash, .. } | Legacy { hash, .. } => *hash,
-			Inline(x) => blake2_256(x.as_ref()).into(),
+			Inline(x) => <H as Hash>::hash(x.as_ref()),
 		}
 	}
 
 	/// Returns the hash to lookup the preimage.
 	///
 	/// If this is a `Bounded::Inline`, `None` is returned as no lookup is required.
-	pub fn lookup_hash(&self) -> Option<Hash> {
+	pub fn lookup_hash(&self) -> Option<H::Output> {
 		use Bounded::*;
 		match self {
 			Lookup { hash, .. } | Legacy { hash, .. } => Some(*hash),
@@ -115,13 +116,13 @@ impl<T> Bounded<T> {
 	}
 
 	/// Constructs a `Lookup` bounded item.
-	pub fn unrequested(hash: Hash, len: u32) -> Self {
+	pub fn unrequested(hash: H::Output, len: u32) -> Self {
 		Self::Lookup { hash, len }
 	}
 
 	/// Constructs a `Legacy` bounded item.
 	#[deprecated = "This API is only for transitioning to Scheduler v3 API"]
-	pub fn from_legacy_hash(hash: impl Into<Hash>) -> Self {
+	pub fn from_legacy_hash(hash: impl Into<H::Output>) -> Self {
 		Self::Legacy { hash: hash.into(), dummy: sp_std::marker::PhantomData }
 	}
 }
@@ -130,24 +131,27 @@ pub type FetchResult = Result<Cow<'static, [u8]>, DispatchError>;
 
 /// A interface for looking up preimages from their hash on chain.
 pub trait QueryPreimage {
+	/// The hasher used in the runtime.
+	type H: Hash;
+
 	/// Returns whether a preimage exists for a given hash and if so its length.
-	fn len(hash: &Hash) -> Option<u32>;
+	fn len(hash: &<Self::H as sp_core::Hasher>::Out) -> Option<u32>;
 
 	/// Returns the preimage for a given hash. If given, `len` must be the size of the preimage.
-	fn fetch(hash: &Hash, len: Option<u32>) -> FetchResult;
+	fn fetch(hash: &<Self::H as sp_core::Hasher>::Out, len: Option<u32>) -> FetchResult;
 
 	/// Returns whether a preimage request exists for a given hash.
-	fn is_requested(hash: &Hash) -> bool;
+	fn is_requested(hash: &<Self::H as sp_core::Hasher>::Out) -> bool;
 
 	/// Request that someone report a preimage. Providers use this to optimise the economics for
 	/// preimage reporting.
-	fn request(hash: &Hash);
+	fn request(hash: &<Self::H as sp_core::Hasher>::Out);
 
 	/// Cancel a previous preimage request.
-	fn unrequest(hash: &Hash);
+	fn unrequest(hash: &<Self::H as sp_core::Hasher>::Out);
 
 	/// Request that the data required for decoding the given `bounded` value is made available.
-	fn hold<T>(bounded: &Bounded<T>) {
+	fn hold<T>(bounded: &Bounded<T, Self::H>) {
 		use Bounded::*;
 		match bounded {
 			Inline(..) => {},
@@ -157,7 +161,7 @@ pub trait QueryPreimage {
 
 	/// No longer request that the data required for decoding the given `bounded` value is made
 	/// available.
-	fn drop<T>(bounded: &Bounded<T>) {
+	fn drop<T>(bounded: &Bounded<T, Self::H>) {
 		use Bounded::*;
 		match bounded {
 			Inline(..) => {},
@@ -167,7 +171,7 @@ pub trait QueryPreimage {
 
 	/// Check to see if all data required for the given `bounded` value is available for its
 	/// decoding.
-	fn have<T>(bounded: &Bounded<T>) -> bool {
+	fn have<T>(bounded: &Bounded<T, Self::H>) -> bool {
 		use Bounded::*;
 		match bounded {
 			Inline(..) => true,
@@ -180,7 +184,7 @@ pub trait QueryPreimage {
 	/// It also directly requests the given `hash` using [`Self::request`].
 	///
 	/// This may not be `peek`-able or `realize`-able.
-	fn pick<T>(hash: Hash, len: u32) -> Bounded<T> {
+	fn pick<T>(hash: <Self::H as sp_core::Hasher>::Out, len: u32) -> Bounded<T, Self::H> {
 		Self::request(&hash);
 		Bounded::Lookup { hash, len }
 	}
@@ -190,7 +194,7 @@ pub trait QueryPreimage {
 	///
 	/// NOTE: This does not remove any data needed for realization. If you will no longer use the
 	/// `bounded`, call `realize` instead or call `drop` afterwards.
-	fn peek<T: Decode>(bounded: &Bounded<T>) -> Result<(T, Option<u32>), DispatchError> {
+	fn peek<T: Decode>(bounded: &Bounded<T, Self::H>) -> Result<(T, Option<u32>), DispatchError> {
 		use Bounded::*;
 		match bounded {
 			Inline(data) => T::decode(&mut &data[..]).ok().map(|x| (x, None)),
@@ -209,7 +213,9 @@ pub trait QueryPreimage {
 	/// Convert the given `bounded` value back into its original instance. If successful,
 	/// `drop` any data backing it. This will not break the realisability of independently
 	/// created instances of `Bounded` which happen to have identical data.
-	fn realize<T: Decode>(bounded: &Bounded<T>) -> Result<(T, Option<u32>), DispatchError> {
+	fn realize<T: Decode>(
+		bounded: &Bounded<T, Self::H>,
+	) -> Result<(T, Option<u32>), DispatchError> {
 		let r = Self::peek(bounded)?;
 		Self::drop(bounded);
 		Ok(r)
@@ -230,11 +236,11 @@ pub trait StorePreimage: QueryPreimage {
 	/// Request and attempt to store the bytes of a preimage on chain.
 	///
 	/// May return `DispatchError::Exhausted` if the preimage is just too big.
-	fn note(bytes: Cow<[u8]>) -> Result<Hash, DispatchError>;
+	fn note(bytes: Cow<[u8]>) -> Result<<Self::H as sp_core::Hasher>::Out, DispatchError>;
 
 	/// Attempt to clear a previously noted preimage. Exactly the same as `unrequest` but is
 	/// provided for symmetry.
-	fn unnote(hash: &Hash) {
+	fn unnote(hash: &<Self::H as sp_core::Hasher>::Out) {
 		Self::unrequest(hash)
 	}
 
@@ -244,7 +250,7 @@ pub trait StorePreimage: QueryPreimage {
 	///
 	/// NOTE: Once this API is used, you should use either `drop` or `realize`.
 	/// The value is also noted using [`Self::note`].
-	fn bound<T: Encode>(t: T) -> Result<Bounded<T>, DispatchError> {
+	fn bound<T: Encode>(t: T) -> Result<Bounded<T, Self::H>, DispatchError> {
 		let data = t.encode();
 		let len = data.len() as u32;
 		Ok(match BoundedInline::try_from(data) {
@@ -255,22 +261,24 @@ pub trait StorePreimage: QueryPreimage {
 }
 
 impl QueryPreimage for () {
-	fn len(_: &Hash) -> Option<u32> {
+	type H = sp_runtime::traits::BlakeTwo256;
+
+	fn len(_: &sp_core::H256) -> Option<u32> {
 		None
 	}
-	fn fetch(_: &Hash, _: Option<u32>) -> FetchResult {
+	fn fetch(_: &sp_core::H256, _: Option<u32>) -> FetchResult {
 		Err(DispatchError::Unavailable)
 	}
-	fn is_requested(_: &Hash) -> bool {
+	fn is_requested(_: &sp_core::H256) -> bool {
 		false
 	}
-	fn request(_: &Hash) {}
-	fn unrequest(_: &Hash) {}
+	fn request(_: &sp_core::H256) {}
+	fn unrequest(_: &sp_core::H256) {}
 }
 
 impl StorePreimage for () {
 	const MAX_LENGTH: usize = 0;
-	fn note(_: Cow<[u8]>) -> Result<Hash, DispatchError> {
+	fn note(_: Cow<[u8]>) -> Result<sp_core::H256, DispatchError> {
 		Err(DispatchError::Exhausted)
 	}
 }
@@ -279,22 +287,22 @@ impl StorePreimage for () {
 mod tests {
 	use super::*;
 	use crate::BoundedVec;
-	use sp_runtime::bounded_vec;
+	use sp_runtime::{bounded_vec, traits::BlakeTwo256};
 
 	#[test]
 	fn bounded_size_is_correct() {
-		assert_eq!(<Bounded<Vec<u8>> as MaxEncodedLen>::max_encoded_len(), 131);
+		assert_eq!(<Bounded<Vec<u8>, BlakeTwo256> as MaxEncodedLen>::max_encoded_len(), 131);
 	}
 
 	#[test]
 	fn bounded_basic_works() {
 		let data: BoundedVec<u8, _> = bounded_vec![b'a', b'b', b'c'];
 		let len = data.len() as u32;
-		let hash = blake2_256(&data).into();
+		let hash = BlakeTwo256::hash(&data).into();
 
 		// Inline works
 		{
-			let bound: Bounded<Vec<u8>> = Bounded::Inline(data.clone());
+			let bound: Bounded<Vec<u8>, BlakeTwo256> = Bounded::Inline(data.clone());
 			assert_eq!(bound.hash(), hash);
 			assert_eq!(bound.len(), Some(len));
 			assert!(!bound.lookup_needed());
@@ -302,7 +310,8 @@ mod tests {
 		}
 		// Legacy works
 		{
-			let bound: Bounded<Vec<u8>> = Bounded::Legacy { hash, dummy: Default::default() };
+			let bound: Bounded<Vec<u8>, BlakeTwo256> =
+				Bounded::Legacy { hash, dummy: Default::default() };
 			assert_eq!(bound.hash(), hash);
 			assert_eq!(bound.len(), None);
 			assert!(bound.lookup_needed());
@@ -310,7 +319,8 @@ mod tests {
 		}
 		// Lookup works
 		{
-			let bound: Bounded<Vec<u8>> = Bounded::Lookup { hash, len: data.len() as u32 };
+			let bound: Bounded<Vec<u8>, BlakeTwo256> =
+				Bounded::Lookup { hash, len: data.len() as u32 };
 			assert_eq!(bound.hash(), hash);
 			assert_eq!(bound.len(), Some(len));
 			assert!(bound.lookup_needed());
@@ -323,8 +333,8 @@ mod tests {
 		let data: BoundedVec<u8, _> = bounded_vec![b'a', b'b', b'c'];
 
 		// Transmute a `String` into a `&str`.
-		let x: Bounded<String> = Bounded::Inline(data.clone());
-		let y: Bounded<&str> = x.transmute();
+		let x: Bounded<String, BlakeTwo256> = Bounded::Inline(data.clone());
+		let y: Bounded<&str, BlakeTwo256> = x.transmute();
 		assert_eq!(y, Bounded::Inline(data));
 	}
 }

substrate/frame/support/src/traits/schedule.rs

@@ -387,6 +387,8 @@ pub mod v3 {
 	pub trait Anon<BlockNumber, Call, Origin> {
 		/// An address which can be used for removing a scheduled task.
 		type Address: Codec + MaxEncodedLen + Clone + Eq + EncodeLike + Debug + TypeInfo;
+		/// The hasher used in the runtime.
+		type Hasher: sp_runtime::traits::Hash;
 
 		/// Schedule a dispatch to happen at the beginning of some block in the future.
 		///
@@ -396,7 +398,7 @@ pub mod v3 {
 			maybe_periodic: Option<Period<BlockNumber>>,
 			priority: Priority,
 			origin: Origin,
-			call: Bounded<Call>,
+			call: Bounded<Call, Self::Hasher>,
 		) -> Result<Self::Address, DispatchError>;
 
 		/// Cancel a scheduled task. If periodic, then it will cancel all further instances of that,
@@ -434,6 +436,8 @@ pub mod v3 {
 	pub trait Named<BlockNumber, Call, Origin> {
 		/// An address which can be used for removing a scheduled task.
 		type Address: Codec + MaxEncodedLen + Clone + Eq + EncodeLike + sp_std::fmt::Debug;
+		/// The hasher used in the runtime.
+		type Hasher: sp_runtime::traits::Hash;
 
 		/// Schedule a dispatch to happen at the beginning of some block in the future.
 		///
@@ -446,7 +450,7 @@ pub mod v3 {
 			maybe_periodic: Option<Period<BlockNumber>>,
 			priority: Priority,
 			origin: Origin,
-			call: Bounded<Call>,
+			call: Bounded<Call, Self::Hasher>,
 		) -> Result<Self::Address, DispatchError>;
 
 		/// Cancel a scheduled, named task. If periodic, then it will cancel all further instances

substrate/frame/whitelist/src/benchmarking.rs

@@ -79,7 +79,7 @@ benchmarks! {
 		let call_weight = call.get_dispatch_info().weight;
 		let encoded_call = call.encode();
 		let call_encoded_len = encoded_call.len() as u32;
-		let call_hash = call.blake2_256().into();
+		let call_hash = T::Hashing::hash_of(&call);
 
 		Pallet::<T>::whitelist_call(origin.clone(), call_hash)
 			.expect("whitelisting call must be successful");
@@ -106,7 +106,7 @@ benchmarks! {
 		let remark = sp_std::vec![1u8; n as usize];
 
 		let call: <T as Config>::RuntimeCall = frame_system::Call::remark { remark }.into();
-		let call_hash = call.blake2_256().into();
+		let call_hash = T::Hashing::hash_of(&call);
 
 		Pallet::<T>::whitelist_call(origin.clone(), call_hash)
 			.expect("whitelisting call must be successful");

substrate/frame/whitelist/src/lib.rs

@@ -44,12 +44,11 @@ use codec::{DecodeLimit, Encode, FullCodec};
 use frame_support::{
 	dispatch::{GetDispatchInfo, PostDispatchInfo},
 	ensure,
-	traits::{Hash as PreimageHash, QueryPreimage, StorePreimage},
+	traits::{QueryPreimage, StorePreimage},
 	weights::Weight,
-	Hashable,
 };
 use scale_info::TypeInfo;
-use sp_runtime::traits::Dispatchable;
+use sp_runtime::traits::{Dispatchable, Hash};
 use sp_std::prelude::*;
 
 pub use pallet::*;
@@ -81,7 +80,7 @@ pub mod pallet {
 		type DispatchWhitelistedOrigin: EnsureOrigin<Self::RuntimeOrigin>;
 
 		/// The handler of pre-images.
-		type Preimages: QueryPreimage + StorePreimage;
+		type Preimages: QueryPreimage<H = Self::Hashing> + StorePreimage;
 
 		/// The weight information for this pallet.
 		type WeightInfo: WeightInfo;
@@ -93,9 +92,9 @@ pub mod pallet {
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
-		CallWhitelisted { call_hash: PreimageHash },
-		WhitelistedCallRemoved { call_hash: PreimageHash },
-		WhitelistedCallDispatched { call_hash: PreimageHash, result: DispatchResultWithPostInfo },
+		CallWhitelisted { call_hash: T::Hash },
+		WhitelistedCallRemoved { call_hash: T::Hash },
+		WhitelistedCallDispatched { call_hash: T::Hash, result: DispatchResultWithPostInfo },
 	}
 
 	#[pallet::error]
@@ -113,14 +112,13 @@ pub mod pallet {
 	}
 
 	#[pallet::storage]
-	pub type WhitelistedCall<T: Config> =
-		StorageMap<_, Twox64Concat, PreimageHash, (), OptionQuery>;
+	pub type WhitelistedCall<T: Config> = StorageMap<_, Twox64Concat, T::Hash, (), OptionQuery>;
 
 	#[pallet::call]
 	impl<T: Config> Pallet<T> {
 		#[pallet::call_index(0)]
 		#[pallet::weight(T::WeightInfo::whitelist_call())]
-		pub fn whitelist_call(origin: OriginFor<T>, call_hash: PreimageHash) -> DispatchResult {
+		pub fn whitelist_call(origin: OriginFor<T>, call_hash: T::Hash) -> DispatchResult {
 			T::WhitelistOrigin::ensure_origin(origin)?;
 
 			ensure!(
@@ -138,10 +136,7 @@ pub mod pallet {
 
 		#[pallet::call_index(1)]
 		#[pallet::weight(T::WeightInfo::remove_whitelisted_call())]
-		pub fn remove_whitelisted_call(
-			origin: OriginFor<T>,
-			call_hash: PreimageHash,
-		) -> DispatchResult {
+		pub fn remove_whitelisted_call(origin: OriginFor<T>, call_hash: T::Hash) -> DispatchResult {
 			T::WhitelistOrigin::ensure_origin(origin)?;
 
 			WhitelistedCall::<T>::take(call_hash).ok_or(Error::<T>::CallIsNotWhitelisted)?;
@@ -160,7 +155,7 @@ pub mod pallet {
 		)]
 		pub fn dispatch_whitelisted_call(
 			origin: OriginFor<T>,
-			call_hash: PreimageHash,
+			call_hash: T::Hash,
 			call_encoded_len: u32,
 			call_weight_witness: Weight,
 		) -> DispatchResultWithPostInfo {
@@ -206,7 +201,7 @@ pub mod pallet {
 		) -> DispatchResultWithPostInfo {
 			T::DispatchWhitelistedOrigin::ensure_origin(origin)?;
 
-			let call_hash = call.blake2_256().into();
+			let call_hash = T::Hashing::hash_of(&call).into();
 
 			ensure!(
 				WhitelistedCall::<T>::contains_key(call_hash),
@@ -227,10 +222,7 @@ impl<T: Config> Pallet<T> {
 	/// Clean whitelisting/preimage and dispatch call.
 	///
 	/// Return the call actual weight of the dispatched call if there is some.
-	fn clean_and_dispatch(
-		call_hash: PreimageHash,
-		call: <T as Config>::RuntimeCall,
-	) -> Option<Weight> {
+	fn clean_and_dispatch(call_hash: T::Hash, call: <T as Config>::RuntimeCall) -> Option<Weight> {
 		WhitelistedCall::<T>::remove(call_hash);
 
 		T::Preimages::unrequest(&call_hash);