Correctly fail back on outbound channel check for blinded HTLC
[rust-lightning] / lightning / src / ln / channel.rs
index 61e99c45a9c69e31fc9d586803aaead7a9414f84..46209a0c402d3a181c699579eb21daad00b50631 100644 (file)
@@ -37,7 +37,8 @@ use crate::chain::BestBlock;
 use crate::chain::chaininterface::{FeeEstimator, ConfirmationTarget, LowerBoundedFeeEstimator};
 use crate::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, LATENCY_GRACE_PERIOD_BLOCKS, CLOSED_CHANNEL_UPDATE_ID};
 use crate::chain::transaction::{OutPoint, TransactionData};
-use crate::sign::{EcdsaChannelSigner, WriteableEcdsaChannelSigner, EntropySource, ChannelSigner, SignerProvider, NodeSigner, Recipient};
+use crate::sign::ecdsa::{EcdsaChannelSigner, WriteableEcdsaChannelSigner};
+use crate::sign::{EntropySource, ChannelSigner, SignerProvider, NodeSigner, Recipient};
 use crate::events::ClosureReason;
 use crate::routing::gossip::NodeId;
 use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer};
@@ -55,6 +56,8 @@ use core::ops::Deref;
 use crate::sync::Mutex;
 use crate::sign::type_resolver::ChannelSignerType;
 
+use super::channel_keys::{DelayedPaymentBasepoint, HtlcBasepoint, RevocationBasepoint};
+
 #[cfg(test)]
 pub struct ChannelValueStat {
        pub value_to_self_msat: u64,
@@ -227,6 +230,7 @@ struct OutboundHTLCOutput {
        payment_hash: PaymentHash,
        state: OutboundHTLCState,
        source: HTLCSource,
+       blinding_point: Option<PublicKey>,
        skimmed_fee_msat: Option<u64>,
 }
 
@@ -241,6 +245,7 @@ enum HTLCUpdateAwaitingACK {
                onion_routing_packet: msgs::OnionPacket,
                // The extra fee we're skimming off the top of this HTLC.
                skimmed_fee_msat: Option<u64>,
+               blinding_point: Option<PublicKey>,
        },
        ClaimHTLC {
                payment_preimage: PaymentPreimage,
@@ -645,7 +650,7 @@ pub(super) enum ChannelPhase<SP: Deref> where SP::Target: SignerProvider {
 
 impl<'a, SP: Deref> ChannelPhase<SP> where
        SP::Target: SignerProvider,
-       <SP::Target as SignerProvider>::Signer: ChannelSigner,
+       <SP::Target as SignerProvider>::EcdsaSigner: ChannelSigner,
 {
        pub fn context(&'a self) -> &'a ChannelContext<SP> {
                match self {
@@ -723,7 +728,7 @@ pub(super) struct ChannelContext<SP: Deref> where SP::Target: SignerProvider {
 
        latest_monitor_update_id: u64,
 
-       holder_signer: ChannelSignerType<<SP::Target as SignerProvider>::Signer>,
+       holder_signer: ChannelSignerType<SP>,
        shutdown_scriptpubkey: Option<ShutdownScript>,
        destination_script: ScriptBuf,
 
@@ -1093,7 +1098,7 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider  {
 
        /// Returns the holder signer for this channel.
        #[cfg(test)]
-       pub fn get_signer(&self) -> &ChannelSignerType<<SP::Target as SignerProvider>::Signer> {
+       pub fn get_signer(&self) -> &ChannelSignerType<SP> {
                return &self.holder_signer
        }
 
@@ -2140,7 +2145,10 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider  {
                        ChannelSignerType::Ecdsa(ecdsa) => {
                                ecdsa.sign_counterparty_commitment(&counterparty_initial_commitment_tx, Vec::new(), &self.secp_ctx)
                                        .map(|(sig, _)| sig).ok()?
-                       }
+                       },
+                       // TODO (taproot|arik)
+                       #[cfg(taproot)]
+                       _ => todo!()
                };
 
                if self.signer_pending_funding {
@@ -2192,7 +2200,10 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider  {
 
                                // We sign "counterparty" commitment transaction, allowing them to broadcast the tx if they wish.
                                (counterparty_initial_commitment_tx, funding_signed)
-                       }
+                       },
+                       // TODO (taproot|arik)
+                       #[cfg(taproot)]
+                       _ => todo!()
                }
        }
 }
@@ -2271,7 +2282,7 @@ struct CommitmentTxInfoCached {
 
 impl<SP: Deref> Channel<SP> where
        SP::Target: SignerProvider,
-       <SP::Target as SignerProvider>::Signer: WriteableEcdsaChannelSigner
+       <SP::Target as SignerProvider>::EcdsaSigner: WriteableEcdsaChannelSigner
 {
        fn check_remote_fee<F: Deref, L: Deref>(
                channel_type: &ChannelTypeFeatures, fee_estimator: &LowerBoundedFeeEstimator<F>,
@@ -2667,7 +2678,7 @@ impl<SP: Deref> Channel<SP> where
        /// If this call is successful, broadcast the funding transaction (and not before!)
        pub fn funding_signed<L: Deref>(
                &mut self, msg: &msgs::FundingSigned, best_block: BestBlock, signer_provider: &SP, logger: &L
-       ) -> Result<ChannelMonitor<<SP::Target as SignerProvider>::Signer>, ChannelError>
+       ) -> Result<ChannelMonitor<<SP::Target as SignerProvider>::EcdsaSigner>, ChannelError>
        where
                L::Target: Logger
        {
@@ -3174,9 +3185,9 @@ impl<SP: Deref> Channel<SP> where
                                let htlc_sighashtype = if self.context.channel_type.supports_anchors_zero_fee_htlc_tx() { EcdsaSighashType::SinglePlusAnyoneCanPay } else { EcdsaSighashType::All };
                                let htlc_sighash = hash_to_message!(&sighash::SighashCache::new(&htlc_tx).segwit_signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, htlc_sighashtype).unwrap()[..]);
                                log_trace!(logger, "Checking HTLC tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} in channel {}.",
-                                       log_bytes!(msg.htlc_signatures[idx].serialize_compact()[..]), log_bytes!(keys.countersignatory_htlc_key.serialize()),
+                                       log_bytes!(msg.htlc_signatures[idx].serialize_compact()[..]), log_bytes!(keys.countersignatory_htlc_key.to_public_key().serialize()),
                                        encode::serialize_hex(&htlc_tx), log_bytes!(htlc_sighash[..]), encode::serialize_hex(&htlc_redeemscript), &self.context.channel_id());
-                               if let Err(_) = self.context.secp_ctx.verify_ecdsa(&htlc_sighash, &msg.htlc_signatures[idx], &keys.countersignatory_htlc_key) {
+                               if let Err(_) = self.context.secp_ctx.verify_ecdsa(&htlc_sighash, &msg.htlc_signatures[idx], &keys.countersignatory_htlc_key.to_public_key()) {
                                        return Err(ChannelError::Close("Invalid HTLC tx signature from peer".to_owned()));
                                }
                                if !separate_nondust_htlc_sources {
@@ -3347,11 +3358,12 @@ impl<SP: Deref> Channel<SP> where
                                match &htlc_update {
                                        &HTLCUpdateAwaitingACK::AddHTLC {
                                                amount_msat, cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet,
-                                               skimmed_fee_msat, ..
+                                               skimmed_fee_msat, blinding_point, ..
                                        } => {
-                                               match self.send_htlc(amount_msat, *payment_hash, cltv_expiry, source.clone(),
-                                                       onion_routing_packet.clone(), false, skimmed_fee_msat, fee_estimator, logger)
-                                               {
+                                               match self.send_htlc(
+                                                       amount_msat, *payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone(),
+                                                       false, skimmed_fee_msat, blinding_point, fee_estimator, logger
+                                               ) {
                                                        Ok(_) => update_add_count += 1,
                                                        Err(e) => {
                                                                match e {
@@ -3483,7 +3495,10 @@ impl<SP: Deref> Channel<SP> where
                                        self.context.cur_counterparty_commitment_transaction_number + 1,
                                        &secret
                                ).map_err(|_| ChannelError::Close("Failed to validate revocation from peer".to_owned()))?;
-                       }
+                       },
+                       // TODO (taproot|arik)
+                       #[cfg(taproot)]
+                       _ => todo!()
                };
 
                self.context.commitment_secrets.provide_secret(self.context.cur_counterparty_commitment_transaction_number + 1, msg.per_commitment_secret)
@@ -4064,6 +4079,7 @@ impl<SP: Deref> Channel<SP> where
                                        cltv_expiry: htlc.cltv_expiry,
                                        onion_routing_packet: (**onion_packet).clone(),
                                        skimmed_fee_msat: htlc.skimmed_fee_msat,
+                                       blinding_point: htlc.blinding_point,
                                });
                        }
                }
@@ -4164,6 +4180,7 @@ impl<SP: Deref> Channel<SP> where
                        return Err(ChannelError::Close("Peer sent an invalid channel_reestablish to force close in a non-standard way".to_owned()));
                }
 
+               let our_commitment_transaction = INITIAL_COMMITMENT_NUMBER - self.context.cur_holder_commitment_transaction_number - 1;
                if msg.next_remote_commitment_number > 0 {
                        let expected_point = self.context.holder_signer.as_ref().get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1, &self.context.secp_ctx);
                        let given_secret = SecretKey::from_slice(&msg.your_last_per_commitment_secret)
@@ -4171,7 +4188,7 @@ impl<SP: Deref> Channel<SP> where
                        if expected_point != PublicKey::from_secret_key(&self.context.secp_ctx, &given_secret) {
                                return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided".to_owned()));
                        }
-                       if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.context.cur_holder_commitment_transaction_number {
+                       if msg.next_remote_commitment_number > our_commitment_transaction {
                                macro_rules! log_and_panic {
                                        ($err_msg: expr) => {
                                                log_error!(logger, $err_msg, &self.context.channel_id, log_pubkey!(self.context.counterparty_node_id));
@@ -4191,11 +4208,12 @@ impl<SP: Deref> Channel<SP> where
 
                // Before we change the state of the channel, we check if the peer is sending a very old
                // commitment transaction number, if yes we send a warning message.
-               let our_commitment_transaction = INITIAL_COMMITMENT_NUMBER - self.context.cur_holder_commitment_transaction_number - 1;
-               if  msg.next_remote_commitment_number + 1 < our_commitment_transaction {
-                       return Err(
-                               ChannelError::Warn(format!("Peer attempted to reestablish channel with a very old local commitment transaction: {} (received) vs {} (expected)", msg.next_remote_commitment_number, our_commitment_transaction))
-                       );
+               if msg.next_remote_commitment_number + 1 < our_commitment_transaction {
+                       return Err(ChannelError::Warn(format!(
+                               "Peer attempted to reestablish channel with a very old local commitment transaction: {} (received) vs {} (expected)",
+                               msg.next_remote_commitment_number,
+                               our_commitment_transaction
+                       )));
                }
 
                // Go ahead and unmark PeerDisconnected as various calls we may make check for it (and all
@@ -4237,11 +4255,11 @@ impl<SP: Deref> Channel<SP> where
                        });
                }
 
-               let required_revoke = if msg.next_remote_commitment_number + 1 == INITIAL_COMMITMENT_NUMBER - self.context.cur_holder_commitment_transaction_number {
+               let required_revoke = if msg.next_remote_commitment_number == our_commitment_transaction {
                        // Remote isn't waiting on any RevokeAndACK from us!
                        // Note that if we need to repeat our ChannelReady we'll do that in the next if block.
                        None
-               } else if msg.next_remote_commitment_number + 1 == (INITIAL_COMMITMENT_NUMBER - 1) - self.context.cur_holder_commitment_transaction_number {
+               } else if msg.next_remote_commitment_number + 1 == our_commitment_transaction {
                        if self.context.channel_state & (ChannelState::MonitorUpdateInProgress as u32) != 0 {
                                self.context.monitor_pending_revoke_and_ack = true;
                                None
@@ -4249,7 +4267,12 @@ impl<SP: Deref> Channel<SP> where
                                Some(self.get_last_revoke_and_ack())
                        }
                } else {
-                       return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old local commitment transaction".to_owned()));
+                       debug_assert!(false, "All values should have been handled in the four cases above");
+                       return Err(ChannelError::Close(format!(
+                               "Peer attempted to reestablish channel expecting a future local commitment transaction: {} (received) vs {} (expected)",
+                               msg.next_remote_commitment_number,
+                               our_commitment_transaction
+                       )));
                };
 
                // We increment cur_counterparty_commitment_transaction_number only upon receipt of
@@ -4307,8 +4330,18 @@ impl<SP: Deref> Channel<SP> where
                                        order: self.context.resend_order.clone(),
                                })
                        }
+               } else if msg.next_local_commitment_number < next_counterparty_commitment_number {
+                       Err(ChannelError::Close(format!(
+                               "Peer attempted to reestablish channel with a very old remote commitment transaction: {} (received) vs {} (expected)",
+                               msg.next_local_commitment_number,
+                               next_counterparty_commitment_number,
+                       )))
                } else {
-                       Err(ChannelError::Close("Peer attempted to reestablish channel with a very old remote commitment transaction".to_owned()))
+                       Err(ChannelError::Close(format!(
+                               "Peer attempted to reestablish channel with a future remote commitment transaction: {} (received) vs {} (expected)",
+                               msg.next_local_commitment_number,
+                               next_counterparty_commitment_number,
+                       )))
                }
        }
 
@@ -4436,7 +4469,10 @@ impl<SP: Deref> Channel<SP> where
                                                max_fee_satoshis: our_max_fee,
                                        }),
                                }), None, None))
-                       }
+                       },
+                       // TODO (taproot|arik)
+                       #[cfg(taproot)]
+                       _ => todo!()
                }
        }
 
@@ -4687,7 +4723,10 @@ impl<SP: Deref> Channel<SP> where
                                                                max_fee_satoshis: our_max_fee,
                                                        }),
                                                }), signed_tx, shutdown_result))
-                                       }
+                                       },
+                                       // TODO (taproot|arik)
+                                       #[cfg(taproot)]
+                                       _ => todo!()
                                }
                        }
                }
@@ -4799,7 +4838,7 @@ impl<SP: Deref> Channel<SP> where
        }
 
        #[cfg(test)]
-       pub fn get_signer(&self) -> &ChannelSignerType<<SP::Target as SignerProvider>::Signer> {
+       pub fn get_signer(&self) -> &ChannelSignerType<SP> {
                &self.context.holder_signer
        }
 
@@ -5318,7 +5357,10 @@ impl<SP: Deref> Channel<SP> where
                                        node_signature: our_node_sig,
                                        bitcoin_signature: our_bitcoin_sig,
                                })
-                       }
+                       },
+                       // TODO (taproot|arik)
+                       #[cfg(taproot)]
+                       _ => todo!()
                }
        }
 
@@ -5345,7 +5387,10 @@ impl<SP: Deref> Channel<SP> where
                                                bitcoin_signature_2: if were_node_one { their_bitcoin_sig } else { our_bitcoin_sig },
                                                contents: announcement,
                                        })
-                               }
+                               },
+                               // TODO (taproot|arik)
+                               #[cfg(taproot)]
+                               _ => todo!()
                        }
                } else {
                        Err(ChannelError::Ignore("Attempted to sign channel announcement before we'd received announcement_signatures".to_string()))
@@ -5463,13 +5508,13 @@ impl<SP: Deref> Channel<SP> where
        pub fn queue_add_htlc<F: Deref, L: Deref>(
                &mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
                onion_routing_packet: msgs::OnionPacket, skimmed_fee_msat: Option<u64>,
-               fee_estimator: &LowerBoundedFeeEstimator<F>, logger: &L
+               blinding_point: Option<PublicKey>, fee_estimator: &LowerBoundedFeeEstimator<F>, logger: &L
        ) -> Result<(), ChannelError>
        where F::Target: FeeEstimator, L::Target: Logger
        {
                self
                        .send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet, true,
-                               skimmed_fee_msat, fee_estimator, logger)
+                               skimmed_fee_msat, blinding_point, fee_estimator, logger)
                        .map(|msg_opt| assert!(msg_opt.is_none(), "We forced holding cell?"))
                        .map_err(|err| {
                                if let ChannelError::Ignore(_) = err { /* fine */ }
@@ -5497,7 +5542,8 @@ impl<SP: Deref> Channel<SP> where
        fn send_htlc<F: Deref, L: Deref>(
                &mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
                onion_routing_packet: msgs::OnionPacket, mut force_holding_cell: bool,
-               skimmed_fee_msat: Option<u64>, fee_estimator: &LowerBoundedFeeEstimator<F>, logger: &L
+               skimmed_fee_msat: Option<u64>, blinding_point: Option<PublicKey>,
+               fee_estimator: &LowerBoundedFeeEstimator<F>, logger: &L
        ) -> Result<Option<msgs::UpdateAddHTLC>, ChannelError>
        where F::Target: FeeEstimator, L::Target: Logger
        {
@@ -5554,6 +5600,7 @@ impl<SP: Deref> Channel<SP> where
                                source,
                                onion_routing_packet,
                                skimmed_fee_msat,
+                               blinding_point,
                        });
                        return Ok(None);
                }
@@ -5565,6 +5612,7 @@ impl<SP: Deref> Channel<SP> where
                        cltv_expiry,
                        state: OutboundHTLCState::LocalAnnounced(Box::new(onion_routing_packet.clone())),
                        source,
+                       blinding_point,
                        skimmed_fee_msat,
                });
 
@@ -5576,6 +5624,7 @@ impl<SP: Deref> Channel<SP> where
                        cltv_expiry,
                        onion_routing_packet,
                        skimmed_fee_msat,
+                       blinding_point,
                };
                self.context.next_holder_htlc_id += 1;
 
@@ -5706,7 +5755,7 @@ impl<SP: Deref> Channel<SP> where
                                                log_trace!(logger, "Signed remote HTLC tx {} with redeemscript {} with pubkey {} -> {} in channel {}",
                                                        encode::serialize_hex(&chan_utils::build_htlc_transaction(&counterparty_commitment_txid, commitment_stats.feerate_per_kw, self.context.get_holder_selected_contest_delay(), htlc, &self.context.channel_type, &counterparty_keys.broadcaster_delayed_payment_key, &counterparty_keys.revocation_key)),
                                                        encode::serialize_hex(&chan_utils::get_htlc_redeemscript(&htlc, &self.context.channel_type, &counterparty_keys)),
-                                                       log_bytes!(counterparty_keys.broadcaster_htlc_key.serialize()),
+                                                       log_bytes!(counterparty_keys.broadcaster_htlc_key.to_public_key().serialize()),
                                                        log_bytes!(htlc_sig.serialize_compact()[..]), &self.context.channel_id());
                                        }
                                }
@@ -5718,7 +5767,10 @@ impl<SP: Deref> Channel<SP> where
                                        #[cfg(taproot)]
                                        partial_signature_with_nonce: None,
                                }, (counterparty_commitment_txid, commitment_stats.htlcs_included)))
-                       }
+                       },
+                       // TODO (taproot|arik)
+                       #[cfg(taproot)]
+                       _ => todo!()
                }
        }
 
@@ -5735,7 +5787,7 @@ impl<SP: Deref> Channel<SP> where
        where F::Target: FeeEstimator, L::Target: Logger
        {
                let send_res = self.send_htlc(amount_msat, payment_hash, cltv_expiry, source,
-                       onion_routing_packet, false, skimmed_fee_msat, fee_estimator, logger);
+                       onion_routing_packet, false, skimmed_fee_msat, None, fee_estimator, logger);
                if let Err(e) = &send_res { if let ChannelError::Ignore(_) = e {} else { debug_assert!(false, "Sending cannot trigger channel failure"); } }
                match send_res? {
                        Some(_) => {
@@ -6242,10 +6294,10 @@ impl<SP: Deref> OutboundV1Channel<SP> where SP::Target: SignerProvider {
                        to_self_delay: self.context.get_holder_selected_contest_delay(),
                        max_accepted_htlcs: self.context.holder_max_accepted_htlcs,
                        funding_pubkey: keys.funding_pubkey,
-                       revocation_basepoint: keys.revocation_basepoint,
+                       revocation_basepoint: keys.revocation_basepoint.to_public_key(),
                        payment_point: keys.payment_point,
-                       delayed_payment_basepoint: keys.delayed_payment_basepoint,
-                       htlc_basepoint: keys.htlc_basepoint,
+                       delayed_payment_basepoint: keys.delayed_payment_basepoint.to_public_key(),
+                       htlc_basepoint: keys.htlc_basepoint.to_public_key(),
                        first_per_commitment_point,
                        channel_flags: if self.context.config.announced_channel {1} else {0},
                        shutdown_scriptpubkey: Some(match &self.context.shutdown_scriptpubkey {
@@ -6367,10 +6419,10 @@ impl<SP: Deref> OutboundV1Channel<SP> where SP::Target: SignerProvider {
 
                let counterparty_pubkeys = ChannelPublicKeys {
                        funding_pubkey: msg.funding_pubkey,
-                       revocation_basepoint: msg.revocation_basepoint,
+                       revocation_basepoint: RevocationBasepoint::from(msg.revocation_basepoint),
                        payment_point: msg.payment_point,
-                       delayed_payment_basepoint: msg.delayed_payment_basepoint,
-                       htlc_basepoint: msg.htlc_basepoint
+                       delayed_payment_basepoint: DelayedPaymentBasepoint::from(msg.delayed_payment_basepoint),
+                       htlc_basepoint: HtlcBasepoint::from(msg.htlc_basepoint)
                };
 
                self.context.channel_transaction_parameters.counterparty_parameters = Some(CounterpartyChannelTransactionParameters {
@@ -6443,10 +6495,10 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
                let pubkeys = holder_signer.pubkeys().clone();
                let counterparty_pubkeys = ChannelPublicKeys {
                        funding_pubkey: msg.funding_pubkey,
-                       revocation_basepoint: msg.revocation_basepoint,
+                       revocation_basepoint: RevocationBasepoint::from(msg.revocation_basepoint),
                        payment_point: msg.payment_point,
-                       delayed_payment_basepoint: msg.delayed_payment_basepoint,
-                       htlc_basepoint: msg.htlc_basepoint
+                       delayed_payment_basepoint: DelayedPaymentBasepoint::from(msg.delayed_payment_basepoint),
+                       htlc_basepoint: HtlcBasepoint::from(msg.htlc_basepoint)
                };
 
                if config.channel_handshake_config.our_to_self_delay < BREAKDOWN_TIMEOUT {
@@ -6776,10 +6828,10 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
                        to_self_delay: self.context.get_holder_selected_contest_delay(),
                        max_accepted_htlcs: self.context.holder_max_accepted_htlcs,
                        funding_pubkey: keys.funding_pubkey,
-                       revocation_basepoint: keys.revocation_basepoint,
+                       revocation_basepoint: keys.revocation_basepoint.to_public_key(),
                        payment_point: keys.payment_point,
-                       delayed_payment_basepoint: keys.delayed_payment_basepoint,
-                       htlc_basepoint: keys.htlc_basepoint,
+                       delayed_payment_basepoint: keys.delayed_payment_basepoint.to_public_key(),
+                       htlc_basepoint: keys.htlc_basepoint.to_public_key(),
                        first_per_commitment_point,
                        shutdown_scriptpubkey: Some(match &self.context.shutdown_scriptpubkey {
                                Some(script) => script.clone().into_inner(),
@@ -6820,7 +6872,7 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
 
        pub fn funding_created<L: Deref>(
                mut self, msg: &msgs::FundingCreated, best_block: BestBlock, signer_provider: &SP, logger: &L
-       ) -> Result<(Channel<SP>, Option<msgs::FundingSigned>, ChannelMonitor<<SP::Target as SignerProvider>::Signer>), (Self, ChannelError)>
+       ) -> Result<(Channel<SP>, Option<msgs::FundingSigned>, ChannelMonitor<<SP::Target as SignerProvider>::EcdsaSigner>), (Self, ChannelError)>
        where
                L::Target: Logger
        {
@@ -7045,6 +7097,7 @@ impl<SP: Deref> Writeable for Channel<SP> where SP::Target: SignerProvider {
 
                let mut preimages: Vec<&Option<PaymentPreimage>> = vec![];
                let mut pending_outbound_skimmed_fees: Vec<Option<u64>> = Vec::new();
+               let mut pending_outbound_blinding_points: Vec<Option<PublicKey>> = Vec::new();
 
                (self.context.pending_outbound_htlcs.len() as u64).write(writer)?;
                for (idx, htlc) in self.context.pending_outbound_htlcs.iter().enumerate() {
@@ -7091,15 +7144,17 @@ impl<SP: Deref> Writeable for Channel<SP> where SP::Target: SignerProvider {
                        } else if !pending_outbound_skimmed_fees.is_empty() {
                                pending_outbound_skimmed_fees.push(None);
                        }
+                       pending_outbound_blinding_points.push(htlc.blinding_point);
                }
 
                let mut holding_cell_skimmed_fees: Vec<Option<u64>> = Vec::new();
+               let mut holding_cell_blinding_points: Vec<Option<PublicKey>> = Vec::new();
                (self.context.holding_cell_htlc_updates.len() as u64).write(writer)?;
                for (idx, update) in self.context.holding_cell_htlc_updates.iter().enumerate() {
                        match update {
                                &HTLCUpdateAwaitingACK::AddHTLC {
                                        ref amount_msat, ref cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet,
-                                       skimmed_fee_msat,
+                                       blinding_point, skimmed_fee_msat,
                                } => {
                                        0u8.write(writer)?;
                                        amount_msat.write(writer)?;
@@ -7114,6 +7169,8 @@ impl<SP: Deref> Writeable for Channel<SP> where SP::Target: SignerProvider {
                                                }
                                                holding_cell_skimmed_fees.push(Some(skimmed_fee));
                                        } else if !holding_cell_skimmed_fees.is_empty() { holding_cell_skimmed_fees.push(None); }
+
+                                       holding_cell_blinding_points.push(blinding_point);
                                },
                                &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, ref htlc_id } => {
                                        1u8.write(writer)?;
@@ -7283,6 +7340,8 @@ impl<SP: Deref> Writeable for Channel<SP> where SP::Target: SignerProvider {
                        (35, pending_outbound_skimmed_fees, optional_vec),
                        (37, holding_cell_skimmed_fees, optional_vec),
                        (38, self.context.is_batch_funding, option),
+                       (39, pending_outbound_blinding_points, optional_vec),
+                       (41, holding_cell_blinding_points, optional_vec),
                });
 
                Ok(())
@@ -7394,6 +7453,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                                        _ => return Err(DecodeError::InvalidValue),
                                },
                                skimmed_fee_msat: None,
+                               blinding_point: None,
                        });
                }
 
@@ -7408,6 +7468,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                                        source: Readable::read(reader)?,
                                        onion_routing_packet: Readable::read(reader)?,
                                        skimmed_fee_msat: None,
+                                       blinding_point: None,
                                },
                                1 => HTLCUpdateAwaitingACK::ClaimHTLC {
                                        payment_preimage: Readable::read(reader)?,
@@ -7568,6 +7629,9 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
 
                let mut is_batch_funding: Option<()> = None;
 
+               let mut pending_outbound_blinding_points_opt: Option<Vec<Option<PublicKey>>> = None;
+               let mut holding_cell_blinding_points_opt: Option<Vec<Option<PublicKey>>> = None;
+
                read_tlv_fields!(reader, {
                        (0, announcement_sigs, option),
                        (1, minimum_depth, option),
@@ -7594,6 +7658,8 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                        (35, pending_outbound_skimmed_fees_opt, optional_vec),
                        (37, holding_cell_skimmed_fees_opt, optional_vec),
                        (38, is_batch_funding, option),
+                       (39, pending_outbound_blinding_points_opt, optional_vec),
+                       (41, holding_cell_blinding_points_opt, optional_vec),
                });
 
                let (channel_keys_id, holder_signer) = if let Some(channel_keys_id) = channel_keys_id {
@@ -7670,6 +7736,24 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                        // We expect all skimmed fees to be consumed above
                        if iter.next().is_some() { return Err(DecodeError::InvalidValue) }
                }
+               if let Some(blinding_pts) = pending_outbound_blinding_points_opt {
+                       let mut iter = blinding_pts.into_iter();
+                       for htlc in pending_outbound_htlcs.iter_mut() {
+                               htlc.blinding_point = iter.next().ok_or(DecodeError::InvalidValue)?;
+                       }
+                       // We expect all blinding points to be consumed above
+                       if iter.next().is_some() { return Err(DecodeError::InvalidValue) }
+               }
+               if let Some(blinding_pts) = holding_cell_blinding_points_opt {
+                       let mut iter = blinding_pts.into_iter();
+                       for htlc in holding_cell_htlc_updates.iter_mut() {
+                               if let HTLCUpdateAwaitingACK::AddHTLC { ref mut blinding_point, .. } = htlc {
+                                       *blinding_point = iter.next().ok_or(DecodeError::InvalidValue)?;
+                               }
+                       }
+                       // We expect all blinding points to be consumed above
+                       if iter.next().is_some() { return Err(DecodeError::InvalidValue) }
+               }
 
                Ok(Channel {
                        context: ChannelContext {
@@ -7806,15 +7890,15 @@ mod tests {
        use bitcoin::blockdata::opcodes;
        use bitcoin::network::constants::Network;
        use crate::ln::PaymentHash;
-       use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
+       use crate::ln::channel_keys::{RevocationKey, RevocationBasepoint};
+use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
        use crate::ln::channel::InitFeatures;
        use crate::ln::channel::{ChannelState, InboundHTLCOutput, OutboundV1Channel, InboundV1Channel, OutboundHTLCOutput, InboundHTLCState, OutboundHTLCState, HTLCCandidate, HTLCInitiator, commit_tx_fee_msat};
        use crate::ln::channel::{MAX_FUNDING_SATOSHIS_NO_WUMBO, TOTAL_BITCOIN_SUPPLY_SATOSHIS, MIN_THEIR_CHAN_RESERVE_SATOSHIS};
        use crate::ln::features::ChannelTypeFeatures;
        use crate::ln::msgs::{ChannelUpdate, DecodeError, UnsignedChannelUpdate, MAX_VALUE_MSAT};
        use crate::ln::script::ShutdownScript;
-       use crate::ln::chan_utils;
-       use crate::ln::chan_utils::{htlc_success_tx_weight, htlc_timeout_tx_weight};
+       use crate::ln::chan_utils::{self, htlc_success_tx_weight, htlc_timeout_tx_weight};
        use crate::chain::BestBlock;
        use crate::chain::chaininterface::{FeeEstimator, LowerBoundedFeeEstimator, ConfirmationTarget};
        use crate::sign::{ChannelSigner, InMemorySigner, EntropySource, SignerProvider};
@@ -7860,17 +7944,19 @@ mod tests {
        }
 
        impl SignerProvider for Keys {
-               type Signer = InMemorySigner;
+               type EcdsaSigner = InMemorySigner;
+               #[cfg(taproot)]
+               type TaprootSigner = InMemorySigner;
 
                fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
                        self.signer.channel_keys_id()
                }
 
-               fn derive_channel_signer(&self, _channel_value_satoshis: u64, _channel_keys_id: [u8; 32]) -> Self::Signer {
+               fn derive_channel_signer(&self, _channel_value_satoshis: u64, _channel_keys_id: [u8; 32]) -> Self::EcdsaSigner {
                        self.signer.clone()
                }
 
-               fn read_chan_signer(&self, _data: &[u8]) -> Result<Self::Signer, DecodeError> { panic!(); }
+               fn read_chan_signer(&self, _data: &[u8]) -> Result<Self::EcdsaSigner, DecodeError> { panic!(); }
 
                fn get_destination_script(&self, _channel_keys_id: [u8; 32]) -> Result<ScriptBuf, ()> {
                        let secp_ctx = Secp256k1::signing_only();
@@ -8007,6 +8093,7 @@ mod tests {
                                payment_id: PaymentId([42; 32]),
                        },
                        skimmed_fee_msat: None,
+                       blinding_point: None,
                });
 
                // Make sure when Node A calculates their local commitment transaction, none of the HTLCs pass
@@ -8341,9 +8428,10 @@ mod tests {
                use bitcoin::hashes::hex::FromHex;
                use bitcoin::hash_types::Txid;
                use bitcoin::secp256k1::Message;
-               use crate::sign::{ChannelDerivationParameters, HTLCDescriptor, EcdsaChannelSigner};
+               use crate::sign::{ChannelDerivationParameters, HTLCDescriptor, ecdsa::EcdsaChannelSigner};
                use crate::ln::PaymentPreimage;
                use crate::ln::channel::{HTLCOutputInCommitment ,TxCreationKeys};
+               use crate::ln::channel_keys::{DelayedPaymentBasepoint, HtlcBasepoint};
                use crate::ln::chan_utils::{ChannelPublicKeys, HolderCommitmentTransaction, CounterpartyChannelTransactionParameters};
                use crate::util::logger::Logger;
                use crate::sync::Arc;
@@ -8385,10 +8473,10 @@ mod tests {
 
                let counterparty_pubkeys = ChannelPublicKeys {
                        funding_pubkey: public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13"),
-                       revocation_basepoint: PublicKey::from_slice(&<Vec<u8>>::from_hex("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap(),
+                       revocation_basepoint: RevocationBasepoint::from(PublicKey::from_slice(&<Vec<u8>>::from_hex("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap()),
                        payment_point: public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444"),
-                       delayed_payment_basepoint: public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13"),
-                       htlc_basepoint: public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444")
+                       delayed_payment_basepoint: DelayedPaymentBasepoint::from(public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13")),
+                       htlc_basepoint: HtlcBasepoint::from(public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444"))
                };
                chan.context.channel_transaction_parameters.counterparty_parameters = Some(
                        CounterpartyChannelTransactionParameters {
@@ -8404,7 +8492,7 @@ mod tests {
                assert_eq!(counterparty_pubkeys.funding_pubkey.serialize()[..],
                           <Vec<u8>>::from_hex("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
 
-               assert_eq!(counterparty_pubkeys.htlc_basepoint.serialize()[..],
+               assert_eq!(counterparty_pubkeys.htlc_basepoint.to_public_key().serialize()[..],
                           <Vec<u8>>::from_hex("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
 
                // We can't just use build_holder_transaction_keys here as the per_commitment_secret is not
@@ -8489,7 +8577,7 @@ mod tests {
                                        let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, $opt_anchors, &keys);
                                        let htlc_sighashtype = if $opt_anchors.supports_anchors_zero_fee_htlc_tx() { EcdsaSighashType::SinglePlusAnyoneCanPay } else { EcdsaSighashType::All };
                                        let htlc_sighash = Message::from_slice(&sighash::SighashCache::new(&htlc_tx).segwit_signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, htlc_sighashtype).unwrap()[..]).unwrap();
-                                       assert!(secp_ctx.verify_ecdsa(&htlc_sighash, &remote_signature, &keys.countersignatory_htlc_key).is_ok(), "verify counterparty htlc sig");
+                                       assert!(secp_ctx.verify_ecdsa(&htlc_sighash, &remote_signature, &keys.countersignatory_htlc_key.to_public_key()).is_ok(), "verify counterparty htlc sig");
 
                                        let mut preimage: Option<PaymentPreimage> = None;
                                        if !htlc.offered {
@@ -8580,6 +8668,7 @@ mod tests {
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
                                skimmed_fee_msat: None,
+                               blinding_point: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&<Vec<u8>>::from_hex("0202020202020202020202020202020202020202020202020202020202020202").unwrap()).to_byte_array();
                        out
@@ -8593,6 +8682,7 @@ mod tests {
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
                                skimmed_fee_msat: None,
+                               blinding_point: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&<Vec<u8>>::from_hex("0303030303030303030303030303030303030303030303030303030303030303").unwrap()).to_byte_array();
                        out
@@ -9004,6 +9094,7 @@ mod tests {
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
                                skimmed_fee_msat: None,
+                               blinding_point: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&<Vec<u8>>::from_hex("0505050505050505050505050505050505050505050505050505050505050505").unwrap()).to_byte_array();
                        out
@@ -9017,6 +9108,7 @@ mod tests {
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
                                skimmed_fee_msat: None,
+                               blinding_point: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&<Vec<u8>>::from_hex("0505050505050505050505050505050505050505050505050505050505050505").unwrap()).to_byte_array();
                        out
@@ -9098,13 +9190,10 @@ mod tests {
                let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
                assert_eq!(per_commitment_point.serialize()[..], <Vec<u8>>::from_hex("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
 
-               assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).serialize()[..],
-                               <Vec<u8>>::from_hex("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
-
                assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret),
                                SecretKey::from_slice(&<Vec<u8>>::from_hex("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
 
-               assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).serialize()[..],
+               assert_eq!(RevocationKey::from_basepoint(&secp_ctx, &RevocationBasepoint::from(base_point), &per_commitment_point).to_public_key().serialize()[..],
                                <Vec<u8>>::from_hex("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
 
                assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret),