Remove KeysInterface trait.

fuzz/src/chanmon_consistency.rs

@@ -36,7 +36,7 @@ use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, chainmonitor, chan
 use lightning::chain::channelmonitor::{ChannelMonitor, MonitorEvent};
 use lightning::chain::transaction::OutPoint;
 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
-use lightning::chain::keysinterface::{KeyMaterial, KeysInterface, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
+use lightning::chain::keysinterface::{KeyMaterial, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
 use lightning::ln::channelmanager::{self, ChainParameters, ChannelDetails, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId};
 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
@@ -270,8 +270,6 @@ impl SignerProvider for KeyProvider {
 	}
 }
 
-impl KeysInterface for KeyProvider {}
-
 impl KeyProvider {
 	fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 		let mut revoked_commitments = self.enforcement_states.lock().unwrap();

fuzz/src/full_stack.rs

@@ -33,7 +33,7 @@ use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, Confirm, Listen};
 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
 use lightning::chain::chainmonitor;
 use lightning::chain::transaction::OutPoint;
-use lightning::chain::keysinterface::{InMemorySigner, Recipient, KeyMaterial, KeysInterface, EntropySource, NodeSigner, SignerProvider};
+use lightning::chain::keysinterface::{InMemorySigner, Recipient, KeyMaterial, EntropySource, NodeSigner, SignerProvider};
 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
 use lightning::ln::channelmanager::{ChainParameters, ChannelDetails, ChannelManager, PaymentId};
 use lightning::ln::peer_handler::{MessageHandler,PeerManager,SocketDescriptor,IgnoringMessageHandler};
@@ -387,8 +387,6 @@ impl SignerProvider for KeyProvider {
 	}
 }
 
-impl KeysInterface for KeyProvider {}
-
 #[inline]
 pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
 	let input = Arc::new(InputData {
@@ -444,7 +442,7 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
 		best_block: BestBlock::from_genesis(network),
 	};
 	let channelmanager = Arc::new(ChannelManager::new(fee_est.clone(), monitor.clone(), broadcast.clone(), &router, Arc::clone(&logger), keys_manager.clone(), config, params));
-	// Adding new calls to `KeysInterface::get_secure_random_bytes` during startup can change all the
+	// Adding new calls to `EntropySource::get_secure_random_bytes` during startup can change all the
 	// keys subsequently generated in this test. Rather than regenerating all the messages manually,
 	// it's easier to just increment the counter here so the keys don't change.
 	keys_manager.counter.fetch_sub(3, Ordering::AcqRel);

fuzz/src/onion_message.rs

@@ -5,7 +5,7 @@ use bitcoin::secp256k1::{PublicKey, Scalar, Secp256k1, SecretKey};
 use bitcoin::secp256k1::ecdh::SharedSecret;
 use bitcoin::secp256k1::ecdsa::RecoverableSignature;
 
-use lightning::chain::keysinterface::{Recipient, KeyMaterial, KeysInterface, EntropySource, NodeSigner, SignerProvider};
+use lightning::chain::keysinterface::{Recipient, KeyMaterial, EntropySource, NodeSigner, SignerProvider};
 use lightning::ln::msgs::{self, DecodeError, OnionMessageHandler};
 use lightning::ln::script::ShutdownScript;
 use lightning::util::enforcing_trait_impls::EnforcingSigner;
@@ -140,8 +140,6 @@ impl SignerProvider for KeyProvider {
 	fn get_shutdown_scriptpubkey(&self) -> ShutdownScript { unreachable!() }
 }
 
-impl KeysInterface for KeyProvider {}
-
 #[cfg(test)]
 mod tests {
 	use lightning::util::logger::{Logger, Record};

lightning-background-processor/src/lib.rs

@@ -17,7 +17,7 @@ extern crate lightning_rapid_gossip_sync;
 use lightning::chain;
 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
 use lightning::chain::chainmonitor::{ChainMonitor, Persist};
-use lightning::chain::keysinterface::{KeysInterface, SignerProvider};
+use lightning::chain::keysinterface::{EntropySource, NodeSigner, SignerProvider};
 use lightning::ln::channelmanager::ChannelManager;
 use lightning::ln::msgs::{ChannelMessageHandler, OnionMessageHandler, RoutingMessageHandler};
 use lightning::ln::peer_handler::{CustomMessageHandler, PeerManager, SocketDescriptor};
@@ -374,7 +374,7 @@ where
 	CF::Target: 'static + chain::Filter,
 	CW::Target: 'static + chain::Watch<<K::Target as SignerProvider>::Signer>,
 	T::Target: 'static + BroadcasterInterface,
-	K::Target: 'static + KeysInterface,
+	K::Target: 'static + EntropySource + NodeSigner + SignerProvider,
 	F::Target: 'static + FeeEstimator,
 	R::Target: 'static + Router,
 	L::Target: 'static + Logger,
@@ -490,7 +490,7 @@ impl BackgroundProcessor {
 		CF::Target: 'static + chain::Filter,
 		CW::Target: 'static + chain::Watch<<K::Target as SignerProvider>::Signer>,
 		T::Target: 'static + BroadcasterInterface,
-		K::Target: 'static + KeysInterface,
+		K::Target: 'static + EntropySource + NodeSigner + SignerProvider,
 		F::Target: 'static + FeeEstimator,
 		R::Target: 'static + Router,
 		L::Target: 'static + Logger,
@@ -575,7 +575,7 @@ mod tests {
 	use bitcoin::network::constants::Network;
 	use lightning::chain::{BestBlock, Confirm, chainmonitor};
 	use lightning::chain::channelmonitor::ANTI_REORG_DELAY;
-	use lightning::chain::keysinterface::{InMemorySigner, Recipient, EntropySource, KeysInterface, KeysManager, NodeSigner};
+	use lightning::chain::keysinterface::{InMemorySigner, Recipient, EntropySource, KeysManager, NodeSigner};
 	use lightning::chain::transaction::OutPoint;
 	use lightning::get_event_msg;
 	use lightning::ln::channelmanager::{self, BREAKDOWN_TIMEOUT, ChainParameters, ChannelManager, SimpleArcChannelManager};

lightning-block-sync/src/init.rs

@@ -48,7 +48,7 @@ BlockSourceResult<ValidatedBlockHeader> where B::Target: BlockSource {
 /// use lightning::chain::chaininterface::BroadcasterInterface;
 /// use lightning::chain::chaininterface::FeeEstimator;
 /// use lightning::chain::keysinterface;
-/// use lightning::chain::keysinterface::KeysInterface;
+/// use lightning::chain::keysinterface::{EntropySource, NodeSigner, SignerProvider};
 /// use lightning::ln::channelmanager::{ChannelManager, ChannelManagerReadArgs};
 /// use lightning::routing::router::Router;
 /// use lightning::util::config::UserConfig;
@@ -61,7 +61,7 @@ BlockSourceResult<ValidatedBlockHeader> where B::Target: BlockSource {
 ///
 /// async fn init_sync<
 /// 	B: BlockSource,
-/// 	K: KeysInterface,
+/// 	K: EntropySource + NodeSigner + SignerProvider,
 /// 	T: BroadcasterInterface,
 /// 	F: FeeEstimator,
 /// 	R: Router,

lightning-invoice/src/utils.rs

@@ -8,7 +8,7 @@ use bech32::ToBase32;
 use bitcoin_hashes::Hash;
 use lightning::chain;
 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
-use lightning::chain::keysinterface::{Recipient, KeysInterface, NodeSigner, SignerProvider};
+use lightning::chain::keysinterface::{Recipient, NodeSigner, SignerProvider, EntropySource};
 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
 use lightning::ln::channelmanager::{ChannelDetails, ChannelManager, PaymentId, PaymentSendFailure, MIN_FINAL_CLTV_EXPIRY};
 #[cfg(feature = "std")]
@@ -42,7 +42,7 @@ use core::time::Duration;
 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 /// in excess of the current time.
 ///
-/// Note that the provided `keys_manager`'s `KeysInterface` implementation must support phantom
+/// Note that the provided `keys_manager`'s `NodeSigner` implementation must support phantom
 /// invoices in its `sign_invoice` implementation ([`PhantomKeysManager`] satisfies this
 /// requirement).
 ///
@@ -57,7 +57,7 @@ pub fn create_phantom_invoice<K: Deref, L: Deref>(
 	logger: L, network: Currency,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-	K::Target: KeysInterface,
+	K::Target: EntropySource + NodeSigner,
 	L::Target: Logger,
 {
 	let description = Description::new(description).map_err(SignOrCreationError::CreationError)?;
@@ -91,7 +91,7 @@ where
 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 /// in excess of the current time.
 ///
-/// Note that the provided `keys_manager`'s `KeysInterface` implementation must support phantom
+/// Note that the provided `keys_manager`'s `NodeSigner` implementation must support phantom
 /// invoices in its `sign_invoice` implementation ([`PhantomKeysManager`] satisfies this
 /// requirement).
 ///
@@ -106,7 +106,7 @@ pub fn create_phantom_invoice_with_description_hash<K: Deref, L: Deref>(
 	logger: L, network: Currency
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-	K::Target: KeysInterface,
+	K::Target: EntropySource + NodeSigner,
 	L::Target: Logger,
 {
 	_create_phantom_invoice::<K, L>(
@@ -122,7 +122,7 @@ fn _create_phantom_invoice<K: Deref, L: Deref>(
 	logger: L, network: Currency,
 ) -> Result<Invoice, SignOrCreationError<()>>
 where
-	K::Target: KeysInterface,
+	K::Target: EntropySource + NodeSigner,
 	L::Target: Logger,
 {
 	use std::time::{SystemTime, UNIX_EPOCH};
@@ -239,7 +239,7 @@ pub fn create_invoice_from_channelmanager<M: Deref, T: Deref, K: Deref, F: Deref
 where
 	M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 	T::Target: BroadcasterInterface,
-	K::Target: KeysInterface,
+	K::Target: EntropySource + NodeSigner + SignerProvider,
 	F::Target: FeeEstimator,
 	R::Target: Router,
 	L::Target: Logger,
@@ -271,7 +271,7 @@ pub fn create_invoice_from_channelmanager_with_description_hash<M: Deref, T: Der
 where
 	M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 	T::Target: BroadcasterInterface,
-	K::Target: KeysInterface,
+	K::Target: EntropySource + NodeSigner + SignerProvider,
 	F::Target: FeeEstimator,
 	R::Target: Router,
 	L::Target: Logger,
@@ -299,7 +299,7 @@ pub fn create_invoice_from_channelmanager_with_description_hash_and_duration_sin
 		where
 			M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 			T::Target: BroadcasterInterface,
-			K::Target: KeysInterface,
+			K::Target: EntropySource + NodeSigner + SignerProvider,
 			F::Target: FeeEstimator,
 			R::Target: Router,
 			L::Target: Logger,
@@ -322,7 +322,7 @@ pub fn create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T:
 		where
 			M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 			T::Target: BroadcasterInterface,
-			K::Target: KeysInterface,
+			K::Target: EntropySource + NodeSigner + SignerProvider,
 			F::Target: FeeEstimator,
 			R::Target: Router,
 			L::Target: Logger,
@@ -344,7 +344,7 @@ fn _create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T: Der
 		where
 			M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 			T::Target: BroadcasterInterface,
-			K::Target: KeysInterface,
+			K::Target: EntropySource + NodeSigner + SignerProvider,
 			F::Target: FeeEstimator,
 			R::Target: Router,
 			L::Target: Logger,
@@ -370,7 +370,7 @@ pub fn create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_
 	where
 		M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 		T::Target: BroadcasterInterface,
-		K::Target: KeysInterface,
+		K::Target: EntropySource + NodeSigner + SignerProvider,
 		F::Target: FeeEstimator,
 		R::Target: Router,
 		L::Target: Logger,
@@ -395,7 +395,7 @@ fn _create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_has
 	where
 		M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 		T::Target: BroadcasterInterface,
-		K::Target: KeysInterface,
+		K::Target: EntropySource + NodeSigner + SignerProvider,
 		F::Target: FeeEstimator,
 		R::Target: Router,
 		L::Target: Logger,
@@ -576,7 +576,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> Payer for Chann
 where
 	M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
 	T::Target: BroadcasterInterface,
-	K::Target: KeysInterface,
+	K::Target: EntropySource + NodeSigner + SignerProvider,
 	F::Target: FeeEstimator,
 	R::Target: Router,
 	L::Target: Logger,
@@ -630,7 +630,6 @@ mod test {
 	use lightning::util::events::{MessageSendEvent, MessageSendEventsProvider, Event};
 	use lightning::util::test_utils;
 	use lightning::util::config::UserConfig;
-	use lightning::chain::keysinterface::KeysInterface;
 	use crate::utils::create_invoice_from_channelmanager_and_duration_since_epoch;
 	use std::collections::HashSet;
 

lightning-persister/src/lib.rs

@@ -20,7 +20,7 @@ extern crate libc;
 use bitcoin::hash_types::{BlockHash, Txid};
 use bitcoin::hashes::hex::FromHex;
 use lightning::chain::channelmonitor::ChannelMonitor;
-use lightning::chain::keysinterface::{KeysInterface, SignerProvider};
+use lightning::chain::keysinterface::{EntropySource, SignerProvider};
 use lightning::util::ser::{ReadableArgs, Writeable};
 use lightning::util::persist::KVStorePersister;
 use std::fs;
@@ -62,7 +62,7 @@ impl FilesystemPersister {
 	pub fn read_channelmonitors<K: Deref> (
 		&self, keys_manager: K
 	) -> std::io::Result<Vec<(BlockHash, ChannelMonitor<<K::Target as SignerProvider>::Signer>)>>
-		where K::Target: KeysInterface + Sized,
+		where K::Target: EntropySource + SignerProvider + Sized,
 	{
 		let mut path = PathBuf::from(&self.path_to_channel_data);
 		path.push("monitors");

lightning/src/chain/channelmonitor.rs

@@ -42,7 +42,7 @@ use crate::chain;
 use crate::chain::{BestBlock, WatchedOutput};
 use crate::chain::chaininterface::{BroadcasterInterface, FeeEstimator, LowerBoundedFeeEstimator};
 use crate::chain::transaction::{OutPoint, TransactionData};
-use crate::chain::keysinterface::{SpendableOutputDescriptor, StaticPaymentOutputDescriptor, DelayedPaymentOutputDescriptor, Sign, KeysInterface};
+use crate::chain::keysinterface::{SpendableOutputDescriptor, StaticPaymentOutputDescriptor, DelayedPaymentOutputDescriptor, Sign, SignerProvider, EntropySource};
 #[cfg(anchors)]
 use crate::chain::onchaintx::ClaimEvent;
 use crate::chain::onchaintx::OnchainTxHandler;
@@ -3704,7 +3704,7 @@ where
 
 const MAX_ALLOC_SIZE: usize = 64*1024;
 
-impl<'a, K: KeysInterface> ReadableArgs<&'a K>
+impl<'a, K: EntropySource + SignerProvider> ReadableArgs<&'a K>
 		for (BlockHash, ChannelMonitor<K::Signer>) {
 	fn read<R: io::Read>(reader: &mut R, keys_manager: &'a K) -> Result<Self, DecodeError> {
 		macro_rules! unwrap_obj {

lightning/src/chain/keysinterface.rs

@@ -137,7 +137,7 @@ impl_writeable_tlv_based!(StaticPaymentOutputDescriptor, {
 /// [`SpendableOutputs`]: crate::util::events::Event::SpendableOutputs
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum SpendableOutputDescriptor {
-	/// An output to a script which was provided via [`KeysInterface`] directly, either from
+	/// An output to a script which was provided via [`SignerProvider`] directly, either from
 	/// [`get_destination_script`] or [`get_shutdown_scriptpubkey`], thus you should already
 	/// know how to spend it. No secret keys are provided as LDK was never given any key.
 	/// These may include outputs from a transaction punishing our counterparty or claiming an HTLC
@@ -517,7 +517,7 @@ pub trait SignerProvider {
 	/// [`BaseSign::channel_keys_id`].
 	fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer;
 
-	/// Reads a [`Signer`] for this [`KeysInterface`] from the given input stream.
+	/// Reads a [`Signer`] for this [`SignerProvider`] from the given input stream.
 	/// This is only called during deserialization of other objects which contain
 	/// [`Sign`]-implementing objects (i.e., [`ChannelMonitor`]s and [`ChannelManager`]s).
 	/// The bytes are exactly those which `<Self::Signer as Writeable>::write()` writes, and
@@ -545,9 +545,6 @@ pub trait SignerProvider {
 	fn get_shutdown_scriptpubkey(&self) -> ShutdownScript;
 }
 
-/// A trait to describe an object which can get user secrets and key material.
-pub trait KeysInterface: EntropySource + NodeSigner + SignerProvider {}
-
 #[derive(Clone)]
 /// A simple implementation of [`Sign`] that just keeps the private keys in memory.
 ///
@@ -954,8 +951,8 @@ impl ReadableArgs<SecretKey> for InMemorySigner {
 	}
 }
 
-/// Simple [`KeysInterface`] implementation that takes a 32-byte seed for use as a BIP 32 extended
-/// key and derives keys from that.
+/// Simple implementation of [`EntropySource`], [`NodeSigner`], and [`SignerProvider`] that takes a
+/// 32-byte seed for use as a BIP 32 extended key and derives keys from that.
 ///
 /// Your `node_id` is seed/0'.
 /// Unilateral closes may use seed/1'.
@@ -1331,8 +1328,6 @@ impl SignerProvider for KeysManager {
 	}
 }
 
-impl KeysInterface for KeysManager {}
-
 /// Similar to [`KeysManager`], but allows the node using this struct to receive phantom node
 /// payments.
 ///
@@ -1425,8 +1420,6 @@ impl SignerProvider for PhantomKeysManager {
 	}
 }
 
-impl KeysInterface for PhantomKeysManager {}
-
 impl PhantomKeysManager {
 	/// Constructs a [`PhantomKeysManager`] given a 32-byte seed and an additional `cross_node_seed`
 	/// that is shared across all nodes that intend to participate in [phantom node payments]

lightning/src/chain/onchaintx.rs

@@ -21,7 +21,7 @@ use bitcoin::hash_types::{Txid, BlockHash};
 use bitcoin::secp256k1::{Secp256k1, ecdsa::Signature};
 use bitcoin::secp256k1;
 
-use crate::chain::keysinterface::BaseSign;
+use crate::chain::keysinterface::{BaseSign, EntropySource, SignerProvider};
 use crate::ln::msgs::DecodeError;
 use crate::ln::PaymentPreimage;
 #[cfg(anchors)]
@@ -31,7 +31,7 @@ use crate::ln::chan_utils::{ChannelTransactionParameters, HolderCommitmentTransa
 use crate::chain::chaininterface::ConfirmationTarget;
 use crate::chain::chaininterface::{FeeEstimator, BroadcasterInterface, LowerBoundedFeeEstimator};
 use crate::chain::channelmonitor::{ANTI_REORG_DELAY, CLTV_SHARED_CLAIM_BUFFER};
-use crate::chain::keysinterface::{Sign, KeysInterface};
+use crate::chain::keysinterface::Sign;
 #[cfg(anchors)]
 use crate::chain::package::PackageSolvingData;
 use crate::chain::package::PackageTemplate;
@@ -322,7 +322,7 @@ impl<ChannelSigner: Sign> OnchainTxHandler<ChannelSigner> {
 	}
 }
 
-impl<'a, K: KeysInterface> ReadableArgs<(&'a K, u64, [u8; 32])> for OnchainTxHandler<K::Signer> {
+impl<'a, K: EntropySource + SignerProvider> ReadableArgs<(&'a K, u64, [u8; 32])> for OnchainTxHandler<K::Signer> {
 	fn read<R: io::Read>(reader: &mut R, args: (&'a K, u64, [u8; 32])) -> Result<Self, DecodeError> {
 		let keys_manager = args.0;
 		let channel_value_satoshis = args.1;

lightning/src/ln/chan_utils.rs

@@ -1635,7 +1635,7 @@ mod tests {
 	use crate::ln::chan_utils::{get_htlc_redeemscript, get_to_countersignatory_with_anchors_redeemscript, CommitmentTransaction, TxCreationKeys, ChannelTransactionParameters, CounterpartyChannelTransactionParameters, HTLCOutputInCommitment};
 	use bitcoin::secp256k1::{PublicKey, SecretKey, Secp256k1};
 	use crate::util::test_utils;
-	use crate::chain::keysinterface::{KeysInterface, BaseSign, SignerProvider};
+	use crate::chain::keysinterface::{BaseSign, SignerProvider};
 	use bitcoin::{Network, Txid};
 	use bitcoin::hashes::Hash;
 	use crate::ln::PaymentHash;