Remove unnecessary byte_utils helpers

Now that to_be_bytes is available under our current MSRV of 1.41, we
can use it instead of our own version.

lightning/src/chain/channelmonitor.rs

@@ -291,7 +291,7 @@ struct CounterpartyCommitmentParameters {
 
 impl Writeable for CounterpartyCommitmentParameters {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.write_all(&byte_utils::be64_to_array(0))?;
+		w.write_all(&(0 as u64).to_be_bytes())?;
 		write_tlv_fields!(w, {
 			(0, self.counterparty_delayed_payment_base_key, required),
 			(2, self.counterparty_htlc_base_key, required),
@@ -945,7 +945,7 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
 		self.channel_keys_id.write(writer)?;
 		self.holder_revocation_basepoint.write(writer)?;
 		writer.write_all(&self.funding_info.0.txid[..])?;
-		writer.write_all(&byte_utils::be16_to_array(self.funding_info.0.index))?;
+		writer.write_all(&self.funding_info.0.index.to_be_bytes())?;
 		self.funding_info.1.write(writer)?;
 		self.current_counterparty_commitment_txid.write(writer)?;
 		self.prev_counterparty_commitment_txid.write(writer)?;
@@ -972,24 +972,24 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
 			},
 		}
 
-		writer.write_all(&byte_utils::be16_to_array(self.on_holder_tx_csv))?;
+		writer.write_all(&self.on_holder_tx_csv.to_be_bytes())?;
 
 		self.commitment_secrets.write(writer)?;
 
 		macro_rules! serialize_htlc_in_commitment {
 			($htlc_output: expr) => {
 				writer.write_all(&[$htlc_output.offered as u8; 1])?;
-				writer.write_all(&byte_utils::be64_to_array($htlc_output.amount_msat))?;
-				writer.write_all(&byte_utils::be32_to_array($htlc_output.cltv_expiry))?;
+				writer.write_all(&$htlc_output.amount_msat.to_be_bytes())?;
+				writer.write_all(&$htlc_output.cltv_expiry.to_be_bytes())?;
 				writer.write_all(&$htlc_output.payment_hash.0[..])?;
 				$htlc_output.transaction_output_index.write(writer)?;
 			}
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.counterparty_claimable_outpoints.len() as u64))?;
+		writer.write_all(&(self.counterparty_claimable_outpoints.len() as u64).to_be_bytes())?;
 		for (ref txid, ref htlc_infos) in self.counterparty_claimable_outpoints.iter() {
 			writer.write_all(&txid[..])?;
-			writer.write_all(&byte_utils::be64_to_array(htlc_infos.len() as u64))?;
+			writer.write_all(&(htlc_infos.len() as u64).to_be_bytes())?;
 			for &(ref htlc_output, ref htlc_source) in htlc_infos.iter() {
 				debug_assert!(htlc_source.is_none() || Some(**txid) == self.current_counterparty_commitment_txid
 						|| Some(**txid) == self.prev_counterparty_commitment_txid,
@@ -999,13 +999,13 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
 			}
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.counterparty_commitment_txn_on_chain.len() as u64))?;
+		writer.write_all(&(self.counterparty_commitment_txn_on_chain.len() as u64).to_be_bytes())?;
 		for (ref txid, commitment_number) in self.counterparty_commitment_txn_on_chain.iter() {
 			writer.write_all(&txid[..])?;
 			writer.write_all(&byte_utils::be48_to_array(*commitment_number))?;
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.counterparty_hash_commitment_number.len() as u64))?;
+		writer.write_all(&(self.counterparty_hash_commitment_number.len() as u64).to_be_bytes())?;
 		for (ref payment_hash, commitment_number) in self.counterparty_hash_commitment_number.iter() {
 			writer.write_all(&payment_hash.0[..])?;
 			writer.write_all(&byte_utils::be48_to_array(*commitment_number))?;
@@ -1023,7 +1023,7 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
 		writer.write_all(&byte_utils::be48_to_array(self.current_counterparty_commitment_number))?;
 		writer.write_all(&byte_utils::be48_to_array(self.current_holder_commitment_number))?;
 
-		writer.write_all(&byte_utils::be64_to_array(self.payment_preimages.len() as u64))?;
+		writer.write_all(&(self.payment_preimages.len() as u64).to_be_bytes())?;
 		for payment_preimage in self.payment_preimages.values() {
 			writer.write_all(&payment_preimage.0[..])?;
 		}
@@ -1044,15 +1044,15 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
 			}
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.pending_events.len() as u64))?;
+		writer.write_all(&(self.pending_events.len() as u64).to_be_bytes())?;
 		for event in self.pending_events.iter() {
 			event.write(writer)?;
 		}
 
 		self.best_block.block_hash().write(writer)?;
-		writer.write_all(&byte_utils::be32_to_array(self.best_block.height()))?;
+		writer.write_all(&self.best_block.height().to_be_bytes())?;
 
-		writer.write_all(&byte_utils::be64_to_array(self.onchain_events_awaiting_threshold_conf.len() as u64))?;
+		writer.write_all(&(self.onchain_events_awaiting_threshold_conf.len() as u64).to_be_bytes())?;
 		for ref entry in self.onchain_events_awaiting_threshold_conf.iter() {
 			entry.write(writer)?;
 		}

lightning/src/chain/keysinterface.rs

@@ -31,7 +31,7 @@ use bitcoin::secp256k1::ecdh::SharedSecret;
 use bitcoin::secp256k1::ecdsa::RecoverableSignature;
 use bitcoin::{PackedLockTime, secp256k1, Sequence, Witness};
 
-use crate::util::{byte_utils, transaction_utils};
+use crate::util::transaction_utils;
 use crate::util::crypto::{hkdf_extract_expand_twice, sign};
 use crate::util::ser::{Writeable, Writer, Readable, ReadableArgs};
 
@@ -43,6 +43,7 @@ use crate::ln::msgs::UnsignedChannelAnnouncement;
 use crate::ln::script::ShutdownScript;
 
 use crate::prelude::*;
+use core::convert::TryInto;
 use core::sync::atomic::{AtomicUsize, Ordering};
 use crate::io::{self, Error};
 use crate::ln::msgs::{DecodeError, MAX_VALUE_MSAT};
@@ -973,8 +974,8 @@ impl KeysManager {
 				inbound_pmt_key_bytes.copy_from_slice(&inbound_payment_key[..]);
 
 				let mut rand_bytes_unique_start = Sha256::engine();
-				rand_bytes_unique_start.input(&byte_utils::be64_to_array(starting_time_secs));
-				rand_bytes_unique_start.input(&byte_utils::be32_to_array(starting_time_nanos));
+				rand_bytes_unique_start.input(&starting_time_secs.to_be_bytes());
+				rand_bytes_unique_start.input(&starting_time_nanos.to_be_bytes());
 				rand_bytes_unique_start.input(seed);
 
 				let mut res = KeysManager {
@@ -1006,7 +1007,7 @@ impl KeysManager {
 	}
 	/// Derive an old Sign containing per-channel secrets based on a key derivation parameters.
 	pub fn derive_channel_keys(&self, channel_value_satoshis: u64, params: &[u8; 32]) -> InMemorySigner {
-		let chan_id = byte_utils::slice_to_be64(&params[0..8]);
+		let chan_id = u64::from_be_bytes(params[0..8].try_into().unwrap());
 		let mut unique_start = Sha256::engine();
 		unique_start.input(params);
 		unique_start.input(&self.seed);

lightning/src/chain/onchaintx.rs

@@ -37,7 +37,6 @@ use crate::chain::package::PackageSolvingData;
 use crate::chain::package::PackageTemplate;
 use crate::util::logger::Logger;
 use crate::util::ser::{Readable, ReadableArgs, MaybeReadable, Writer, Writeable, VecWriter};
-use crate::util::byte_utils;
 
 use crate::io;
 use crate::prelude::*;
@@ -272,29 +271,29 @@ impl<ChannelSigner: Sign> OnchainTxHandler<ChannelSigner> {
 		(key_data.0.len() as u32).write(writer)?;
 		writer.write_all(&key_data.0[..])?;
 
-		writer.write_all(&byte_utils::be64_to_array(self.pending_claim_requests.len() as u64))?;
+		writer.write_all(&(self.pending_claim_requests.len() as u64).to_be_bytes())?;
 		for (ref ancestor_claim_txid, request) in self.pending_claim_requests.iter() {
 			ancestor_claim_txid.write(writer)?;
 			request.write(writer)?;
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.claimable_outpoints.len() as u64))?;
+		writer.write_all(&(self.claimable_outpoints.len() as u64).to_be_bytes())?;
 		for (ref outp, ref claim_and_height) in self.claimable_outpoints.iter() {
 			outp.write(writer)?;
 			claim_and_height.0.write(writer)?;
 			claim_and_height.1.write(writer)?;
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.locktimed_packages.len() as u64))?;
+		writer.write_all(&(self.locktimed_packages.len() as u64).to_be_bytes())?;
 		for (ref locktime, ref packages) in self.locktimed_packages.iter() {
 			locktime.write(writer)?;
-			writer.write_all(&byte_utils::be64_to_array(packages.len() as u64))?;
+			writer.write_all(&(packages.len() as u64).to_be_bytes())?;
 			for ref package in packages.iter() {
 				package.write(writer)?;
 			}
 		}
 
-		writer.write_all(&byte_utils::be64_to_array(self.onchain_events_awaiting_threshold_conf.len() as u64))?;
+		writer.write_all(&(self.onchain_events_awaiting_threshold_conf.len() as u64).to_be_bytes())?;
 		for ref entry in self.onchain_events_awaiting_threshold_conf.iter() {
 			entry.write(writer)?;
 		}

lightning/src/chain/package.rs

@@ -27,7 +27,6 @@ use crate::ln::msgs::DecodeError;
 use crate::chain::chaininterface::{FeeEstimator, ConfirmationTarget, MIN_RELAY_FEE_SAT_PER_1000_WEIGHT};
 use crate::chain::keysinterface::Sign;
 use crate::chain::onchaintx::OnchainTxHandler;
-use crate::util::byte_utils;
 use crate::util::logger::Logger;
 use crate::util::ser::{Readable, Writer, Writeable};
 
@@ -774,7 +773,7 @@ impl PackageTemplate {
 
 impl Writeable for PackageTemplate {
 	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
-		writer.write_all(&byte_utils::be64_to_array(self.inputs.len() as u64))?;
+		writer.write_all(&(self.inputs.len() as u64).to_be_bytes())?;
 		for (ref outpoint, ref rev_outp) in self.inputs.iter() {
 			outpoint.write(writer)?;
 			rev_outp.write(writer)?;

lightning/src/ln/chan_utils.rs

@@ -24,7 +24,7 @@ use bitcoin::hash_types::{Txid, PubkeyHash};
 use crate::ln::{PaymentHash, PaymentPreimage};
 use crate::ln::msgs::DecodeError;
 use crate::util::ser::{Readable, Writeable, Writer};
-use crate::util::{byte_utils, transaction_utils};
+use crate::util::transaction_utils;
 
 use bitcoin::secp256k1::{SecretKey, PublicKey, Scalar};
 use bitcoin::secp256k1::{Secp256k1, ecdsa::Signature, Message};
@@ -310,7 +310,7 @@ impl Writeable for CounterpartyCommitmentSecrets {
 	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 		for &(ref secret, ref idx) in self.old_secrets.iter() {
 			writer.write_all(secret)?;
-			writer.write_all(&byte_utils::be64_to_array(*idx))?;
+			writer.write_all(&idx.to_be_bytes())?;
 		}
 		write_tlv_fields!(writer, {});
 		Ok(())

lightning/src/ln/channelmanager.rs

@@ -54,7 +54,7 @@ use crate::ln::wire::Encode;
 use crate::chain::keysinterface::{Sign, KeysInterface, KeysManager, Recipient};
 use crate::util::config::{UserConfig, ChannelConfig};
 use crate::util::events::{Event, EventHandler, EventsProvider, MessageSendEvent, MessageSendEventsProvider, ClosureReason, HTLCDestination};
-use crate::util::{byte_utils, events};
+use crate::util::events;
 use crate::util::wakers::{Future, Notifier};
 use crate::util::scid_utils::fake_scid;
 use crate::util::ser::{BigSize, FixedLengthReader, Readable, ReadableArgs, MaybeReadable, Writeable, Writer, VecWriter};
@@ -2041,7 +2041,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 			return Err(ReceiveError {
 				msg: "Upstream node set CLTV to the wrong value",
 				err_code: 18,
-				err_data: byte_utils::be32_to_array(cltv_expiry).to_vec()
+				err_data: cltv_expiry.to_be_bytes().to_vec()
 			})
 		}
 		// final_expiry_too_soon
@@ -2060,7 +2060,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 		if hop_data.amt_to_forward > amt_msat {
 			return Err(ReceiveError {
 				err_code: 19,
-				err_data: byte_utils::be64_to_array(amt_msat).to_vec(),
+				err_data: amt_msat.to_be_bytes().to_vec(),
 				msg: "Upstream node sent less than we were supposed to receive in payment",
 			});
 		}
@@ -3439,9 +3439,9 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
 								macro_rules! fail_htlc {
 									($htlc: expr, $payment_hash: expr) => {
-										let mut htlc_msat_height_data = byte_utils::be64_to_array($htlc.value).to_vec();
+										let mut htlc_msat_height_data = $htlc.value.to_be_bytes().to_vec();
 										htlc_msat_height_data.extend_from_slice(
-											&byte_utils::be32_to_array(self.best_block.read().unwrap().height()),
+											&self.best_block.read().unwrap().height().to_be_bytes(),
 										);
 										failed_forwards.push((HTLCSource::PreviousHopData(HTLCPreviousHopData {
 												short_channel_id: $htlc.prev_hop.short_channel_id,
@@ -3895,9 +3895,8 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 		let removed_source = self.claimable_htlcs.lock().unwrap().remove(payment_hash);
 		if let Some((_, mut sources)) = removed_source {
 			for htlc in sources.drain(..) {
-				let mut htlc_msat_height_data = byte_utils::be64_to_array(htlc.value).to_vec();
-				htlc_msat_height_data.extend_from_slice(&byte_utils::be32_to_array(
-						self.best_block.read().unwrap().height()));
+				let mut htlc_msat_height_data = htlc.value.to_be_bytes().to_vec();
+				htlc_msat_height_data.extend_from_slice(&self.best_block.read().unwrap().height().to_be_bytes());
 				self.fail_htlc_backwards_internal(
 						HTLCSource::PreviousHopData(htlc.prev_hop), payment_hash,
 						HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: htlc_msat_height_data },
@@ -4291,9 +4290,8 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 			mem::drop(channel_state_lock);
 			if !valid_mpp {
 				for htlc in sources.drain(..) {
-					let mut htlc_msat_height_data = byte_utils::be64_to_array(htlc.value).to_vec();
-					htlc_msat_height_data.extend_from_slice(&byte_utils::be32_to_array(
-						self.best_block.read().unwrap().height()));
+					let mut htlc_msat_height_data = htlc.value.to_be_bytes().to_vec();
+					htlc_msat_height_data.extend_from_slice(&self.best_block.read().unwrap().height().to_be_bytes());
 					self.fail_htlc_backwards_internal(
 						HTLCSource::PreviousHopData(htlc.prev_hop), &payment_hash,
 						HTLCFailReason::Reason { failure_code: 0x4000|15, data: htlc_msat_height_data },
@@ -6267,8 +6265,8 @@ where
 					// number of blocks we generally consider it to take to do a commitment update,
 					// just give up on it and fail the HTLC.
 					if height >= htlc.cltv_expiry - HTLC_FAIL_BACK_BUFFER {
-						let mut htlc_msat_height_data = byte_utils::be64_to_array(htlc.value).to_vec();
-						htlc_msat_height_data.extend_from_slice(&byte_utils::be32_to_array(height));
+						let mut htlc_msat_height_data = htlc.value.to_be_bytes().to_vec();
+						htlc_msat_height_data.extend_from_slice(&height.to_be_bytes());
 						timed_out_htlcs.push((HTLCSource::PreviousHopData(htlc.prev_hop.clone()), payment_hash.clone(), HTLCFailReason::Reason {
 							failure_code: 0x4000 | 15,
 							data: htlc_msat_height_data

lightning/src/util/byte_utils.rs

@@ -17,34 +17,6 @@ pub fn slice_to_be48(v: &[u8]) -> u64 {
 	((v[5] as u64) << 8*0)
 }
 #[inline]
-pub fn slice_to_be64(v: &[u8]) -> u64 {
-	((v[0] as u64) << 8*7) |
-	((v[1] as u64) << 8*6) |
-	((v[2] as u64) << 8*5) |
-	((v[3] as u64) << 8*4) |
-	((v[4] as u64) << 8*3) |
-	((v[5] as u64) << 8*2) |
-	((v[6] as u64) << 8*1) |
-	((v[7] as u64) << 8*0)
-}
-
-#[inline]
-pub fn be16_to_array(u: u16) -> [u8; 2] {
-	let mut v = [0; 2];
-	v[0] = ((u >> 8*1) & 0xff) as u8;
-	v[1] = ((u >> 8*0) & 0xff) as u8;
-	v
-}
-#[inline]
-pub fn be32_to_array(u: u32) -> [u8; 4] {
-	let mut v = [0; 4];
-	v[0] = ((u >> 8*3) & 0xff) as u8;
-	v[1] = ((u >> 8*2) & 0xff) as u8;
-	v[2] = ((u >> 8*1) & 0xff) as u8;
-	v[3] = ((u >> 8*0) & 0xff) as u8;
-	v
-}
-#[inline]
 pub fn be48_to_array(u: u64) -> [u8; 6] {
 	assert!(u & 0xffff_0000_0000_0000 == 0);
 	let mut v = [0; 6];
@@ -56,19 +28,6 @@ pub fn be48_to_array(u: u64) -> [u8; 6] {
 	v[5] = ((u >> 8*0) & 0xff) as u8;
 	v
 }
-#[inline]
-pub fn be64_to_array(u: u64) -> [u8; 8] {
-	let mut v = [0; 8];
-	v[0] = ((u >> 8*7) & 0xff) as u8;
-	v[1] = ((u >> 8*6) & 0xff) as u8;
-	v[2] = ((u >> 8*5) & 0xff) as u8;
-	v[3] = ((u >> 8*4) & 0xff) as u8;
-	v[4] = ((u >> 8*3) & 0xff) as u8;
-	v[5] = ((u >> 8*2) & 0xff) as u8;
-	v[6] = ((u >> 8*1) & 0xff) as u8;
-	v[7] = ((u >> 8*0) & 0xff) as u8;
-	v
-}
 
 #[cfg(test)]
 mod tests {
@@ -77,10 +36,6 @@ mod tests {
 	#[test]
 	fn test_all() {
 		assert_eq!(slice_to_be48(&[0xde, 0xad, 0xbe, 0xef, 0x1b, 0xad]), 0xdeadbeef1bad);
-		assert_eq!(slice_to_be64(&[0xde, 0xad, 0xbe, 0xef, 0x1b, 0xad, 0x1d, 0xea]), 0xdeadbeef1bad1dea);
-		assert_eq!(be16_to_array(0xdead), [0xde, 0xad]);
-		assert_eq!(be32_to_array(0xdeadbeef), [0xde, 0xad, 0xbe, 0xef]);
 		assert_eq!(be48_to_array(0xdeadbeef1bad), [0xde, 0xad, 0xbe, 0xef, 0x1b, 0xad]);
-		assert_eq!(be64_to_array(0xdeadbeef1bad1dea), [0xde, 0xad, 0xbe, 0xef, 0x1b, 0xad, 0x1d, 0xea]);
 	}
 }