use bitcoin::blockdata::block::BlockHeader;
use bitcoin::blockdata::script::{Script,Builder};
use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
use bitcoin::blockdata::opcodes;
use bitcoin::util::uint::Uint256;
use bitcoin::util::hash::{Sha256dHash, Hash160};
use bitcoin::util::bip143;
use bitcoin::network::serialize::BitcoinHash;
use secp256k1::key::{PublicKey,SecretKey};
use secp256k1::{Secp256k1,Message,Signature};
use secp256k1;
use crypto::digest::Digest;
use crypto::hkdf::{hkdf_extract,hkdf_expand};
use ln::msgs;
use ln::msgs::{HandleError, MsgEncodable};
use ln::channelmonitor::ChannelMonitor;
use ln::channelmanager::{PendingForwardHTLCInfo, HTLCFailReason};
use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment,HTLC_SUCCESS_TX_WEIGHT,HTLC_TIMEOUT_TX_WEIGHT};
use ln::chan_utils;
use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
use util::{transaction_utils,rng};
use util::sha2::Sha256;
use std::default::Default;
use std::{cmp,mem};
use std::time::Instant;
pub struct ChannelKeys {
pub funding_key: SecretKey,
pub revocation_base_key: SecretKey,
pub payment_base_key: SecretKey,
pub delayed_payment_base_key: SecretKey,
pub htlc_base_key: SecretKey,
pub channel_close_key: SecretKey,
pub channel_monitor_claim_key: SecretKey,
pub commitment_seed: [u8; 32],
}
impl ChannelKeys {
pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
let mut prk = [0; 32];
hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
let secp_ctx = Secp256k1::without_caps();
let mut okm = [0; 32];
hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
let funding_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning revocation base key info", &mut okm);
let revocation_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning payment base key info", &mut okm);
let payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning delayed payment base key info", &mut okm);
let delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
Ok(ChannelKeys {
funding_key: funding_key,
revocation_base_key: revocation_base_key,
payment_base_key: payment_base_key,
delayed_payment_base_key: delayed_payment_base_key,
htlc_base_key: htlc_base_key,
channel_close_key: channel_close_key,
channel_monitor_claim_key: channel_monitor_claim_key,
commitment_seed: okm
})
}
}
#[derive(PartialEq)]
enum HTLCState {
/// Added by remote, to be included in next local commitment tx.
RemoteAnnounced,
/// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
/// the remote side hasn't yet revoked their previous state, which we need them to do before we
/// accept this HTLC. Implies AwaitingRemoteRevoke.
/// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
/// a remote revoke_and_ack on a previous state before we can do so.
AwaitingRemoteRevokeToAnnounce,
/// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
/// the remote side hasn't yet revoked their previous state, which we need them to do before we
/// accept this HTLC. Implies AwaitingRemoteRevoke.
/// We have included this HTLC in our latest commitment_signed and are now just waiting on a
/// revoke_and_ack.
AwaitingAnnouncedRemoteRevoke,
/// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
/// created it we would have put it in the holding cell instead). When they next revoke_and_ack
/// we will promote to Committed (note that they may not accept it until the next time we
/// revoke, but we dont really care about that:
/// * they've revoked, so worst case we can announce an old state and get our (option on)
/// money back (though we wont), and,
/// * we'll send them a revoke when they send a commitment_signed, and since only they're
/// allowed to remove it, the "can only be removed once committed on both sides" requirement
/// doesn't matter to us and its up to them to enforce it, worst-case they jump ahead but
/// we'll never get out of sync).
LocalAnnounced,
Committed,
/// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
/// the change (though they'll need to revoke before we fail the payment).
RemoteRemoved,
/// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
/// the remote side hasn't yet revoked their previous state, which we need them to do before we
/// can do any backwards failing. Implies AwaitingRemoteRevoke.
/// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
/// remote revoke_and_ack on a previous state before we can do so.
AwaitingRemoteRevokeToRemove,
/// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
/// the remote side hasn't yet revoked their previous state, which we need them to do before we
/// can do any backwards failing. Implies AwaitingRemoteRevoke.
/// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
/// revoke_and_ack to drop completely.
AwaitingRemovedRemoteRevoke,
/// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
/// created it we would have put it in the holding cell instead). When they next revoke_and_ack
/// we'll promote to LocalRemovedAwaitingCommitment if we fulfilled, otherwise we'll drop at
/// that point.
/// Note that we have to keep an eye on the HTLC until we've received a broadcastable
/// commitment transaction without it as otherwise we'll have to force-close the channel to
/// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
/// anyway).
LocalRemoved,
/// Removed by us, sent a new commitment_signed and got a revoke_and_ack. Just waiting on an
/// updated local commitment transaction.
LocalRemovedAwaitingCommitment,
}
struct HTLCOutput { //TODO: Refactor into Outbound/InboundHTLCOutput (will save memory and fewer panics)
outbound: bool, // ie to an HTLC-Timeout transaction
htlc_id: u64,
amount_msat: u64,
cltv_expiry: u32,
payment_hash: [u8; 32],
state: HTLCState,
/// If we're in a Remote* removed state, set if they failed, otherwise None
fail_reason: Option<HTLCFailReason>,
/// If we're in LocalRemoved*, set to true if we fulfilled the HTLC, and can claim money
local_removed_fulfilled: bool,
/// state pre-committed Remote* implies pending_forward_state, otherwise it must be None
pending_forward_state: Option<PendingForwardHTLCInfo>,
}
impl HTLCOutput {
fn get_in_commitment(&self, offered: bool) -> HTLCOutputInCommitment {
HTLCOutputInCommitment {
offered: offered,
amount_msat: self.amount_msat,
cltv_expiry: self.cltv_expiry,
payment_hash: self.payment_hash,
transaction_output_index: 0
}
}
}
/// See AwaitingRemoteRevoke ChannelState for more info
enum HTLCUpdateAwaitingACK {
AddHTLC {
// always outbound
amount_msat: u64,
cltv_expiry: u32,
payment_hash: [u8; 32],
onion_routing_packet: msgs::OnionPacket,
time_created: Instant, //TODO: Some kind of timeout thing-a-majig
},
ClaimHTLC {
payment_preimage: [u8; 32],
payment_hash: [u8; 32], // Only here for effecient duplicate detection
},
FailHTLC {
payment_hash: [u8; 32],
err_packet: msgs::OnionErrorPacket,
},
}
enum ChannelState {
/// Implies we have (or are prepared to) send our open_channel/accept_channel message
OurInitSent = (1 << 0),
/// Implies we have received their open_channel/accept_channel message
TheirInitSent = (1 << 1),
/// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
/// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
/// upon receipt of funding_created, so simply skip this state.
FundingCreated = 4,
/// Set when we have received/sent funding_created and funding_signed and are thus now waiting
/// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
/// and our counterparty consider the funding transaction confirmed.
FundingSent = 8,
/// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
/// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
TheirFundingLocked = (1 << 4),
/// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
/// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
OurFundingLocked = (1 << 5),
ChannelFunded = 64,
/// Flag which implies that we have sent a commitment_signed but are awaiting the responding
/// revoke_and_ack message. During this time period, we can't generate new commitment_signed
/// messages as then we will be unable to determine which HTLCs they included in their
/// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
/// later.
/// Flag is set on ChannelFunded.
AwaitingRemoteRevoke = (1 << 7),
/// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
/// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
/// to respond with our own shutdown message when possible.
RemoteShutdownSent = (1 << 8),
/// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
/// point, we may not add any new HTLCs to the channel.
/// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
/// us their shutdown.
LocalShutdownSent = (1 << 9),
/// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
/// to drop us, but we store this anyway.
ShutdownComplete = (1 << 10),
}
const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
// TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
// has been completed, and then turn into a Channel to get compiler-time enforcement of things like
// calling get_channel_id() before we're set up or things like get_outbound_funding_signed on an
// inbound channel.
pub struct Channel {
user_id: u64,
channel_id: Uint256,
channel_state: u32,
channel_outbound: bool,
secp_ctx: Secp256k1,
announce_publicly: bool,
channel_value_satoshis: u64,
local_keys: ChannelKeys,
cur_local_commitment_transaction_number: u64,
cur_remote_commitment_transaction_number: u64,
value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
pending_htlcs: Vec<HTLCOutput>,
holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
next_local_htlc_id: u64,
next_remote_htlc_id: u64,
channel_update_count: u32,
feerate_per_kw: u64,
#[cfg(test)]
// Used in ChannelManager's tests to send a revoked transaction
pub last_local_commitment_txn: Vec<Transaction>,
#[cfg(not(test))]
last_local_commitment_txn: Vec<Transaction>,
last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
/// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
/// to detect unconfirmation after a serialize-unserialize roudtrip where we may not see a full
/// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
/// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
funding_tx_confirmed_in: Sha256dHash,
short_channel_id: Option<u64>,
/// Used to deduplicate block_connected callbacks
last_block_connected: Sha256dHash,
funding_tx_confirmations: u64,
their_dust_limit_satoshis: u64,
our_dust_limit_satoshis: u64,
their_max_htlc_value_in_flight_msat: u64,
//get_our_max_htlc_value_in_flight_msat(): u64,
their_channel_reserve_satoshis: u64,
//get_our_channel_reserve_satoshis(): u64,
their_htlc_minimum_msat: u64,
our_htlc_minimum_msat: u64,
their_to_self_delay: u16,
//implied by BREAKDOWN_TIMEOUT: our_to_self_delay: u16,
their_max_accepted_htlcs: u16,
//implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
their_funding_pubkey: PublicKey,
their_revocation_basepoint: PublicKey,
their_payment_basepoint: PublicKey,
their_delayed_payment_basepoint: PublicKey,
their_htlc_basepoint: PublicKey,
their_cur_commitment_point: PublicKey,
their_prev_commitment_point: Option<PublicKey>,
their_node_id: PublicKey,
their_shutdown_scriptpubkey: Option<Script>,
channel_monitor: ChannelMonitor,
}
const OUR_MAX_HTLCS: u16 = 5; //TODO
const CONF_TARGET: u32 = 12; //TODO: Should be much higher
/// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
/// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
/// really allow for this, so instead we're stuck closing it out at that point.
const UNCONF_THRESHOLD: u32 = 6;
/// The amount of time we require our counterparty wait to claim their money (ie time between when
/// we, or our watchtower, must check for them having broadcast a theft transaction).
const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
/// The amount of time we're willing to wait to claim money back to us
const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
const B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT: u64 = 104; // prevout: 40, nSequence: 4, script len: 1, witness lengths: 3/4, sig: 73/4, pubkey: 33/4, output: 31 (TODO: Wrong? Useless?)
macro_rules! secp_call {
( $res: expr, $err: expr ) => {
match $res {
Ok(key) => key,
//TODO: make the error a parameter
Err(_) => return Err(HandleError{err: $err, msg: Some(msgs::ErrorAction::DisconnectPeer{})})
}
};
}
macro_rules! secp_derived_key {
( $res: expr ) => {
secp_call!($res, "Derived invalid key, peer is maliciously selecting parameters")
}
}
impl Channel {
// Convert constants + channel value to limits:
fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
channel_value_satoshis * 1000 / 10 //TODO
}
/// Guaranteed to return a value no larger than channel_value_satoshis
fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
cmp::min(channel_value_satoshis, 10) //TODO
}
fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT //TODO
}
fn derive_our_htlc_minimum_msat(_at_open_channel_feerate_per_kw: u64) -> u64 {
1000 // TODO
}
// Constructors:
/// panics if channel_value_satoshis is >= (1 << 24)
pub fn new_outbound(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, channel_value_satoshis: u64, announce_publicly: bool, user_id: u64) -> Channel {
if channel_value_satoshis >= (1 << 24) {
panic!("funding value > 2^24");
}
let feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal);
let background_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
let secp_ctx = Secp256k1::new();
let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).unwrap().serialize());
let our_channel_monitor_claim_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script();
let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
&PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
&chan_keys.htlc_base_key,
BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
Channel {
user_id: user_id,
channel_id: rng::rand_uint256(),
channel_state: ChannelState::OurInitSent as u32,
channel_outbound: true,
secp_ctx: secp_ctx,
announce_publicly: announce_publicly,
channel_value_satoshis: channel_value_satoshis,
local_keys: chan_keys,
cur_local_commitment_transaction_number: (1 << 48) - 1,
cur_remote_commitment_transaction_number: (1 << 48) - 1,
value_to_self_msat: channel_value_satoshis * 1000, //TODO: give them something on open? Parameterize it?
pending_htlcs: Vec::new(),
holding_cell_htlc_updates: Vec::new(),
next_local_htlc_id: 0,
next_remote_htlc_id: 0,
channel_update_count: 1,
last_local_commitment_txn: Vec::new(),
last_sent_closing_fee: None,
funding_tx_confirmed_in: Default::default(),
short_channel_id: None,
last_block_connected: Default::default(),
funding_tx_confirmations: 0,
feerate_per_kw: feerate * 250,
their_dust_limit_satoshis: 0,
our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
their_max_htlc_value_in_flight_msat: 0,
their_channel_reserve_satoshis: 0,
their_htlc_minimum_msat: 0,
our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(feerate * 250),
their_to_self_delay: 0,
their_max_accepted_htlcs: 0,
their_funding_pubkey: PublicKey::new(),
their_revocation_basepoint: PublicKey::new(),
their_payment_basepoint: PublicKey::new(),
their_delayed_payment_basepoint: PublicKey::new(),
their_htlc_basepoint: PublicKey::new(),
their_cur_commitment_point: PublicKey::new(),
their_prev_commitment_point: None,
their_node_id: their_node_id,
their_shutdown_scriptpubkey: None,
channel_monitor: channel_monitor,
}
}
fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), HandleError> {
if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background) * 250 {
return Err(HandleError{err: "Peer's feerate much too low", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::HighPriority) * 375 { // 375 = 250 * 1.5x
return Err(HandleError{err: "Peer's feerate much too high", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
Ok(())
}
/// Creates a new channel from a remote sides' request for one.
/// Assumes chain_hash has already been checked and corresponds with what we expect!
/// Generally prefers to take the DisconnectPeer action on failure, as a notice to the sender
/// that we're rejecting the new channel.
pub fn new_from_req(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, announce_publicly: bool) -> Result<Channel, HandleError> {
// Check sanity of message fields:
if msg.funding_satoshis >= (1 << 24) {
return Err(HandleError{err: "funding value > 2^24", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.funding_satoshis > 21000000 * 100000000 {
return Err(HandleError{err: "More funding_satoshis than there are satoshis!", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.channel_reserve_satoshis > msg.funding_satoshis {
return Err(HandleError{err: "Bogus channel_reserve_satoshis", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
return Err(HandleError{err: "push_msat more than highest possible value", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.dust_limit_satoshis > msg.funding_satoshis {
return Err(HandleError{err: "Peer never wants payout outputs?", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.max_htlc_value_in_flight_msat > msg.funding_satoshis * 1000 {
return Err(HandleError{err: "Bogus max_htlc_value_in_flight_satoshis", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
return Err(HandleError{err: "Minimum htlc value is full channel value", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if msg.max_accepted_htlcs < 1 {
return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
if (msg.channel_flags & 254) != 0 {
return Err(HandleError{err: "unknown channel_flags", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
}
// Convert things into internal flags and prep our state:
let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
let background_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
let secp_ctx = Secp256k1::new();
let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).unwrap().serialize());
let our_channel_monitor_claim_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script();
let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
&PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
&chan_keys.htlc_base_key,
BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
channel_monitor.set_their_htlc_base_key(&msg.htlc_basepoint);
channel_monitor.set_their_to_self_delay(msg.to_self_delay);
let mut chan = Channel {
user_id: user_id,
channel_id: msg.temporary_channel_id,
channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
channel_outbound: false,
secp_ctx: secp_ctx,
announce_publicly: their_announce && announce_publicly,
local_keys: chan_keys,
cur_local_commitment_transaction_number: (1 << 48) - 1,
cur_remote_commitment_transaction_number: (1 << 48) - 1,
value_to_self_msat: msg.push_msat,
pending_htlcs: Vec::new(),
holding_cell_htlc_updates: Vec::new(),
next_local_htlc_id: 0,
next_remote_htlc_id: 0,
channel_update_count: 1,
last_local_commitment_txn: Vec::new(),
last_sent_closing_fee: None,
funding_tx_confirmed_in: Default::default(),
short_channel_id: None,
last_block_connected: Default::default(),
funding_tx_confirmations: 0,
feerate_per_kw: msg.feerate_per_kw as u64,
channel_value_satoshis: msg.funding_satoshis,
their_dust_limit_satoshis: msg.dust_limit_satoshis,
our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
their_max_htlc_value_in_flight_msat: msg.max_htlc_value_in_flight_msat,
their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
their_htlc_minimum_msat: msg.htlc_minimum_msat,
our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
their_to_self_delay: msg.to_self_delay,
their_max_accepted_htlcs: msg.max_accepted_htlcs,
their_funding_pubkey: msg.funding_pubkey,
their_revocation_basepoint: msg.revocation_basepoint,
their_payment_basepoint: msg.payment_basepoint,
their_delayed_payment_basepoint: msg.delayed_payment_basepoint,
their_htlc_basepoint: msg.htlc_basepoint,
their_cur_commitment_point: msg.first_per_commitment_point,
their_prev_commitment_point: None,
their_node_id: their_node_id,
their_shutdown_scriptpubkey: None,
channel_monitor: channel_monitor,
};
let obscure_factor = chan.get_commitment_transaction_number_obscure_factor();
chan.channel_monitor.set_commitment_obscure_factor(obscure_factor);
Ok(chan)
}
// Utilities to derive keys:
fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, idx);
SecretKey::from_slice(&self.secp_ctx, &res).unwrap()
}
// Utilities to build transactions:
fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
let mut sha = Sha256::new();
let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap();
if self.channel_outbound {
sha.input(&our_payment_basepoint.serialize());
sha.input(&self.their_payment_basepoint.serialize());
} else {
sha.input(&self.their_payment_basepoint.serialize());
sha.input(&our_payment_basepoint.serialize());
}
let mut res = [0; 32];
sha.result(&mut res);
((res[26] as u64) << 5*8) |
((res[27] as u64) << 4*8) |
((res[28] as u64) << 3*8) |
((res[29] as u64) << 2*8) |
((res[30] as u64) << 1*8) |
((res[31] as u64) << 0*8)
}
/// Transaction nomenclature is somewhat confusing here as there are many different cases - a
/// transaction is referred to as "a's transaction" implying that a will be able to broadcast
/// the transaction. Thus, b will generally be sending a signature over such a transaction to
/// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
/// such, a transaction is generally the result of b increasing the amount paid to a (or adding
/// an HTLC to a).
/// @local is used only to convert relevant internal structures which refer to remote vs local
/// to decide value of outputs and direction of HTLCs.
/// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
/// state may indicate that one peer has informed the other that they'd like to add an HTLC but
/// have not yet committed it. Such HTLCs will only be included in transactions which are being
/// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
/// which peer generated this transaction and "to whom" this transaction flows.
#[inline]
fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool) -> (Transaction, Vec<HTLCOutputInCommitment>) {
let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ commitment_number;
let txins = {
let mut ins: Vec<TxIn> = Vec::new();
ins.push(TxIn {
prev_hash: self.channel_monitor.get_funding_txo().unwrap().0,
prev_index: self.channel_monitor.get_funding_txo().unwrap().1 as u32,
script_sig: Script::new(),
sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
witness: Vec::new(),
});
ins
};
let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::new();
let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
let mut remote_htlc_total_msat = 0;
let mut local_htlc_total_msat = 0;
let mut value_to_self_msat_offset = 0;
for ref htlc in self.pending_htlcs.iter() {
let include = match htlc.state {
HTLCState::RemoteAnnounced => !generated_by_local,
HTLCState::AwaitingRemoteRevokeToAnnounce => !generated_by_local,
HTLCState::AwaitingAnnouncedRemoteRevoke => true,
HTLCState::LocalAnnounced => generated_by_local,
HTLCState::Committed => true,
HTLCState::RemoteRemoved => generated_by_local,
HTLCState::AwaitingRemoteRevokeToRemove => generated_by_local,
HTLCState::AwaitingRemovedRemoteRevoke => false,
HTLCState::LocalRemoved => !generated_by_local,
HTLCState::LocalRemovedAwaitingCommitment => false,
};
if include {
if htlc.outbound == local { // "offered HTLC output"
if htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
let htlc_in_tx = htlc.get_in_commitment(true);
txouts.push((TxOut {
script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
value: htlc.amount_msat / 1000
}, Some(htlc_in_tx)));
}
} else {
if htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
let htlc_in_tx = htlc.get_in_commitment(false);
txouts.push((TxOut { // "received HTLC output"
script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
value: htlc.amount_msat / 1000
}, Some(htlc_in_tx)));
}
};
if htlc.outbound {
local_htlc_total_msat += htlc.amount_msat;
} else {
remote_htlc_total_msat += htlc.amount_msat;
}
} else {
match htlc.state {
HTLCState::AwaitingRemoteRevokeToRemove|HTLCState::AwaitingRemovedRemoteRevoke => {
if generated_by_local && htlc.fail_reason.is_none() {
value_to_self_msat_offset -= htlc.amount_msat as i64;
}
},
HTLCState::LocalRemoved => {
if !generated_by_local && htlc.local_removed_fulfilled {
value_to_self_msat_offset += htlc.amount_msat as i64;
}
},
HTLCState::LocalRemovedAwaitingCommitment => {
value_to_self_msat_offset += htlc.amount_msat as i64;
},
_ => {},
}
}
}
let total_fee: u64 = self.feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
let value_to_self: i64 = ((self.value_to_self_msat - local_htlc_total_msat) as i64 + value_to_self_msat_offset) / 1000 - if self.channel_outbound { total_fee as i64 } else { 0 };
let value_to_remote: i64 = (((self.channel_value_satoshis * 1000 - self.value_to_self_msat - remote_htlc_total_msat) as i64 - value_to_self_msat_offset) / 1000) - if self.channel_outbound { 0 } else { total_fee as i64 };
let value_to_a = if local { value_to_self } else { value_to_remote };
let value_to_b = if local { value_to_remote } else { value_to_self };
if value_to_a >= (dust_limit_satoshis as i64) {
txouts.push((TxOut {
script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
&keys.a_delayed_payment_key).to_v0_p2wsh(),
value: value_to_a as u64
}, None));
}
if value_to_b >= (dust_limit_satoshis as i64) {
txouts.push((TxOut {
script_pubkey: Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
.push_slice(&Hash160::from_data(&keys.b_payment_key.serialize())[..])
.into_script(),
value: value_to_b as u64
}, None));
}
transaction_utils::sort_outputs(&mut txouts);
let mut outputs: Vec<TxOut> = Vec::new();
let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::new();
for (idx, out) in txouts.drain(..).enumerate() {
outputs.push(out.0);
if let Some(out_htlc) = out.1 {
htlcs_used.push(out_htlc);
htlcs_used.last_mut().unwrap().transaction_output_index = idx as u32;
}
}
(Transaction {
version: 2,
lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
input: txins,
output: outputs,
}, htlcs_used)
}
#[inline]
fn get_closing_scriptpubkey(&self) -> Script {
let our_channel_close_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.channel_close_key).unwrap().serialize());
Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
}
#[inline]
fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
(4 + 1 + 36 + 4 + 1 + 1 + 2*(8+1) + 4 + a_scriptpubkey.len() as u64 + b_scriptpubkey.len() as u64)*4 + 2 + 1 + 1 + 2*(1 + 72)
}
#[inline]
fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
let txins = {
let mut ins: Vec<TxIn> = Vec::new();
ins.push(TxIn {
prev_hash: self.channel_monitor.get_funding_txo().unwrap().0,
prev_index: self.channel_monitor.get_funding_txo().unwrap().1 as u32,
script_sig: Script::new(),
sequence: 0xffffffff,
witness: Vec::new(),
});
ins
};
assert!(self.pending_htlcs.is_empty());
let mut txouts: Vec<(TxOut, ())> = Vec::new();
let mut total_fee_satoshis = proposed_total_fee_satoshis;
let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
let value_to_remote: i64 = ((self.channel_value_satoshis * 1000 - self.value_to_self_msat) as i64 / 1000) - if self.channel_outbound { 0 } else { total_fee_satoshis as i64 };
if value_to_self < 0 {
assert!(self.channel_outbound);
total_fee_satoshis += (-value_to_self) as u64;
} else if value_to_remote < 0 {
assert!(!self.channel_outbound);
total_fee_satoshis += (-value_to_remote) as u64;
}
if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
txouts.push((TxOut {
script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
value: value_to_remote as u64
}, ()));
}
if value_to_self as u64 > self.our_dust_limit_satoshis {
txouts.push((TxOut {
script_pubkey: self.get_closing_scriptpubkey(),
value: value_to_self as u64
}, ()));
}
transaction_utils::sort_outputs(&mut txouts);
let mut outputs: Vec<TxOut> = Vec::new();
for out in txouts.drain(..) {
outputs.push(out.0);
}
(Transaction {
version: 2,
lock_time: 0,
input: txins,
output: outputs,
}, total_fee_satoshis)
}
#[inline]
/// Creates a set of keys for build_commitment_transaction to generate a transaction which our
/// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
/// our counterparty!)
/// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
/// TODO Some magic rust shit to compile-time check this?
fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, HandleError> {
let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number)).unwrap();
let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key).unwrap();
let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap();
Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &self.their_revocation_basepoint, &self.their_payment_basepoint, &self.their_htlc_basepoint)))
}
#[inline]
/// Creates a set of keys for build_commitment_transaction to generate a transaction which we
/// will sign and send to our counterparty.
fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, HandleError> {
//TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
//may see payments to it!
let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap();
let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key).unwrap();
let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap();
Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point, &self.their_delayed_payment_basepoint, &self.their_htlc_basepoint, &revocation_basepoint, &payment_basepoint, &htlc_basepoint)))
}
/// Gets the redeemscript for the funding transaction output (ie the funding transaction output
/// pays to get_funding_redeemscript().to_v0_p2wsh()).
pub fn get_funding_redeemscript(&self) -> Script {
let builder = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2);
let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap().serialize();
let their_funding_key = self.their_funding_pubkey.serialize();
if our_funding_key[..] < their_funding_key[..] {
builder.push_slice(&our_funding_key)
.push_slice(&their_funding_key)
} else {
builder.push_slice(&their_funding_key)
.push_slice(&our_funding_key)
}.push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script()
}
fn sign_commitment_transaction(&self, tx: &mut Transaction, their_sig: &Signature) -> Signature {
if tx.input.len() != 1 {
panic!("Tried to sign commitment transaction that had input count != 1!");
}
if tx.input[0].witness.len() != 0 {
panic!("Tried to re-sign commitment transaction");
}
let funding_redeemscript = self.get_funding_redeemscript();
let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key).unwrap();
tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap().serialize();
let their_funding_key = self.their_funding_pubkey.serialize();
if our_funding_key[..] < their_funding_key[..] {
tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
} else {
tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
}
tx.input[0].witness[1].push(SigHashType::All as u8);
tx.input[0].witness[2].push(SigHashType::All as u8);
tx.input[0].witness.push(funding_redeemscript.into_vec());
our_sig
}
/// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
/// @local is used only to convert relevant internal structures which refer to remote vs local
/// to decide value of outputs and direction of HTLCs.
fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys) -> Transaction {
chan_utils::build_htlc_transaction(prev_hash, self.feerate_per_kw, if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
}
fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), HandleError> {
if tx.input.len() != 1 {
panic!("Tried to sign HTLC transaction that had input count != 1!");
}
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &keys.per_commitment_point, &self.local_keys.htlc_base_key));
let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key).unwrap() == keys.a_htlc_key;
Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key).unwrap(), is_local_tx))
}
/// Signs a transaction created by build_htlc_transaction. If the transaction is an
/// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, HandleError> {
if tx.input.len() != 1 {
panic!("Tried to sign HTLC transaction that had input count != 1!");
}
if tx.input[0].witness.len() != 0 {
panic!("Tried to re-sign HTLC transaction");
}
let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
if local_tx { // b, then a
tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
} else {
tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
}
tx.input[0].witness[1].push(SigHashType::All as u8);
tx.input[0].witness[2].push(SigHashType::All as u8);
if htlc.offered {
tx.input[0].witness.push(Vec::new());
} else {
tx.input[0].witness.push(preimage.unwrap().to_vec());
}
tx.input[0].witness.push(htlc_redeemscript.into_vec());
Ok(our_sig)
}
pub fn get_update_fulfill_htlc(&mut self, payment_preimage_arg: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, ChannelMonitor)>, HandleError> {
// Either ChannelFunded got set (which means it wont bet unset) or there is no way any
// caller thought we could have something claimed (cause we wouldn't have accepted in an
// incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
// either.
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
}
assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
let mut sha = Sha256::new();
sha.input(&payment_preimage_arg);
let mut payment_hash_calc = [0; 32];
sha.result(&mut payment_hash_calc);
// Now update local state:
if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
for pending_update in self.holding_cell_htlc_updates.iter() {
match pending_update {
&HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, .. } => {
if payment_preimage_arg == *payment_preimage {
return Ok(None);
}
},
&HTLCUpdateAwaitingACK::FailHTLC { ref payment_hash, .. } => {
if payment_hash_calc == *payment_hash {
return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
}
},
_ => {}
}
}
self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
payment_preimage: payment_preimage_arg, payment_hash: payment_hash_calc,
});
return Ok(None);
}
let mut htlc_id = 0;
let mut htlc_amount_msat = 0;
for htlc in self.pending_htlcs.iter_mut() {
if !htlc.outbound && htlc.payment_hash == payment_hash_calc {
if htlc_id != 0 {
panic!("Duplicate HTLC payment_hash, you probably re-used payment preimages, NEVER DO THIS!");
}
htlc_id = htlc.htlc_id;
htlc_amount_msat += htlc.amount_msat;
if htlc.state == HTLCState::Committed {
htlc.state = HTLCState::LocalRemoved;
htlc.local_removed_fulfilled = true;
} else if htlc.state == HTLCState::RemoteAnnounced {
panic!("Somehow forwarded HTLC prior to remote revocation!");
} else if htlc.state == HTLCState::LocalRemoved || htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
} else {
panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
}
}
}
if htlc_amount_msat == 0 {
return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
}
self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
Ok(Some((msgs::UpdateFulfillHTLC {
channel_id: self.channel_id(),
htlc_id: htlc_id,
payment_preimage: payment_preimage_arg,
}, self.channel_monitor.clone())))
}
pub fn get_update_fulfill_htlc_and_commit(&mut self, payment_preimage: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
match self.get_update_fulfill_htlc(payment_preimage)? {
Some(update_fulfill_htlc) => {
let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
Ok(Some((update_fulfill_htlc.0, commitment, monitor_update)))
},
None => Ok(None)
}
}
pub fn get_update_fail_htlc(&mut self, payment_hash_arg: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Was asked to fail an HTLC when channel was not in an operational state", msg: None});
}
assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
// Now update local state:
if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
for pending_update in self.holding_cell_htlc_updates.iter() {
match pending_update {
&HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_hash, .. } => {
if *payment_hash_arg == *payment_hash {
return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
}
},
&HTLCUpdateAwaitingACK::FailHTLC { ref payment_hash, .. } => {
if *payment_hash_arg == *payment_hash {
return Ok(None);
}
},
_ => {}
}
}
self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
payment_hash: payment_hash_arg.clone(),
err_packet,
});
return Ok(None);
}
let mut htlc_id = 0;
let mut htlc_amount_msat = 0;
for htlc in self.pending_htlcs.iter_mut() {
if !htlc.outbound && htlc.payment_hash == *payment_hash_arg {
if htlc_id != 0 {
panic!("Duplicate HTLC payment_hash, you probably re-used payment preimages, NEVER DO THIS!");
}
htlc_id = htlc.htlc_id;
htlc_amount_msat += htlc.amount_msat;
if htlc.state == HTLCState::Committed {
htlc.state = HTLCState::LocalRemoved;
} else if htlc.state == HTLCState::RemoteAnnounced {
panic!("Somehow forwarded HTLC prior to remote revocation!");
} else if htlc.state == HTLCState::LocalRemoved || htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
} else {
panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
}
}
}
if htlc_amount_msat == 0 {
return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
}
Ok(Some(msgs::UpdateFailHTLC {
channel_id: self.channel_id(),
htlc_id,
reason: err_packet
}))
}
pub fn get_update_fail_htlc_and_commit(&mut self, payment_hash: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
match self.get_update_fail_htlc(payment_hash, err_packet)? {
Some(update_fail_htlc) => {
let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
Ok(Some((update_fail_htlc, commitment, monitor_update)))
},
None => Ok(None)
}
}
// Message handlers:
pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
// Check sanity of message fields:
if !self.channel_outbound {
return Err(HandleError{err: "Got an accept_channel message from an inbound peer", msg: None});
}
if self.channel_state != ChannelState::OurInitSent as u32 {
return Err(HandleError{err: "Got an accept_channel message at a strange time", msg: None});
}
if msg.dust_limit_satoshis > 21000000 * 100000000 {
return Err(HandleError{err: "Peer never wants payout outputs?", msg: None});
}
if msg.max_htlc_value_in_flight_msat > self.channel_value_satoshis * 1000 {
return Err(HandleError{err: "Bogus max_htlc_value_in_flight_satoshis", msg: None});
}
if msg.channel_reserve_satoshis > self.channel_value_satoshis {
return Err(HandleError{err: "Bogus channel_reserve_satoshis", msg: None});
}
if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
return Err(HandleError{err: "Minimum htlc value is full channel value", msg: None});
}
//TODO do something with minimum_depth
if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: None});
}
if msg.max_accepted_htlcs < 1 {
return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", msg: None});
}
self.channel_monitor.set_their_htlc_base_key(&msg.htlc_basepoint);
self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
self.their_max_htlc_value_in_flight_msat = msg.max_htlc_value_in_flight_msat;
self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
self.their_to_self_delay = msg.to_self_delay;
self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
self.their_funding_pubkey = msg.funding_pubkey;
self.their_revocation_basepoint = msg.revocation_basepoint;
self.their_payment_basepoint = msg.payment_basepoint;
self.their_delayed_payment_basepoint = msg.delayed_payment_basepoint;
self.their_htlc_basepoint = msg.htlc_basepoint;
self.their_cur_commitment_point = msg.first_per_commitment_point;
let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
Ok(())
}
fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, Signature), HandleError> {
let funding_script = self.get_funding_redeemscript();
let remote_keys = self.build_remote_transaction_keys()?;
let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
// They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
secp_call!(self.secp_ctx.verify(&local_sighash, &sig, &self.their_funding_pubkey), "Invalid funding_created signature from peer");
// We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
Ok((remote_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap()))
}
pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), HandleError> {
if self.channel_outbound {
return Err(HandleError{err: "Received funding_created for an outbound channel?", msg: None});
}
if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
return Err(HandleError{err: "Received funding_created after we got the channel!", msg: None});
}
if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
}
self.channel_monitor.set_funding_info(msg.funding_txid, msg.funding_output_index);
let (remote_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
Ok(res) => res,
Err(e) => {
self.channel_monitor.unset_funding_info();
return Err(e);
}
};
// Now that we're past error-generating stuff, update our local state:
self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new());
self.channel_state = ChannelState::FundingSent as u32;
let funding_txo = self.channel_monitor.get_funding_txo().unwrap();
self.channel_id = funding_txo.0.into_be() ^ Uint256::from_u64(funding_txo.1 as u64).unwrap(); //TODO: or le?
self.cur_remote_commitment_transaction_number -= 1;
self.cur_local_commitment_transaction_number -= 1;
Ok((msgs::FundingSigned {
channel_id: self.channel_id,
signature: our_signature
}, self.channel_monitor.clone()))
}
/// Handles a funding_signed message from the remote end.
/// If this call is successful, broadcast the funding transaction (and not before!)
pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, HandleError> {
if !self.channel_outbound {
return Err(HandleError{err: "Received funding_signed for an inbound channel?", msg: None});
}
if self.channel_state != ChannelState::FundingCreated as u32 {
return Err(HandleError{err: "Received funding_signed in strange state!", msg: None});
}
if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 2 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
}
let funding_script = self.get_funding_redeemscript();
let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
// They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey), "Invalid funding_signed signature from peer");
self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
self.last_local_commitment_txn = vec![local_initial_commitment_tx];
self.channel_state = ChannelState::FundingSent as u32;
self.cur_local_commitment_transaction_number -= 1;
Ok(self.channel_monitor.clone())
}
pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), HandleError> {
let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
if non_shutdown_state == ChannelState::FundingSent as u32 {
self.channel_state |= ChannelState::TheirFundingLocked as u32;
} else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
self.channel_update_count += 1;
} else {
return Err(HandleError{err: "Peer sent a funding_locked at a strange time", msg: None});
}
self.their_prev_commitment_point = Some(self.their_cur_commitment_point);
self.their_cur_commitment_point = msg.next_per_commitment_point;
Ok(())
}
/// Returns (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
/// If its for a remote update check, we need to be more lax about checking against messages we
/// sent but they may not have received/processed before they sent this message. Further, for
/// our own sends, we're more conservative and even consider things they've removed against
/// totals, though there is little reason to outside of further avoiding any race condition
/// issues.
fn get_pending_htlc_stats(&self, for_remote_update_check: bool) -> (u32, u32, u64, u64) {
let mut inbound_htlc_count: u32 = 0;
let mut outbound_htlc_count: u32 = 0;
let mut htlc_outbound_value_msat = 0;
let mut htlc_inbound_value_msat = 0;
for ref htlc in self.pending_htlcs.iter() {
match htlc.state {
HTLCState::RemoteAnnounced => {},
HTLCState::AwaitingRemoteRevokeToAnnounce => {},
HTLCState::AwaitingAnnouncedRemoteRevoke => {},
HTLCState::LocalAnnounced => { if for_remote_update_check { continue; } },
HTLCState::Committed => {},
HTLCState::RemoteRemoved => { if for_remote_update_check { continue; } },
HTLCState::AwaitingRemoteRevokeToRemove => { if for_remote_update_check { continue; } },
HTLCState::AwaitingRemovedRemoteRevoke => { if for_remote_update_check { continue; } },
HTLCState::LocalRemoved => {},
HTLCState::LocalRemovedAwaitingCommitment => { if for_remote_update_check { continue; } },
}
if !htlc.outbound {
inbound_htlc_count += 1;
htlc_inbound_value_msat += htlc.amount_msat;
} else {
outbound_htlc_count += 1;
htlc_outbound_value_msat += htlc.amount_msat;
}
}
(inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
}
pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingForwardHTLCInfo) -> Result<(), HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
}
if msg.amount_msat > self.channel_value_satoshis * 1000 {
return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", msg: None});
}
if msg.amount_msat < self.our_htlc_minimum_msat {
return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", msg: None});
}
let (inbound_htlc_count, _, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(true);
if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", msg: None});
}
//TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
// Check our_max_htlc_value_in_flight_msat
if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", msg: None});
}
// Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
// the reserve_satoshis we told them to always have as direct payment so that they lose
// something if we punish them for broadcasting an old state).
if htlc_inbound_value_msat + htlc_outbound_value_msat + msg.amount_msat + self.value_to_self_msat > (self.channel_value_satoshis - Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis)) * 1000 {
return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", msg: None});
}
if self.next_remote_htlc_id != msg.htlc_id {
return Err(HandleError{err: "Remote skipped HTLC ID", msg: None});
}
if msg.cltv_expiry >= 500000000 {
return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", msg: None});
}
//TODO: Check msg.cltv_expiry further? Do this in channel manager?
// Now update local state:
self.next_remote_htlc_id += 1;
self.pending_htlcs.push(HTLCOutput {
outbound: false,
htlc_id: msg.htlc_id,
amount_msat: msg.amount_msat,
payment_hash: msg.payment_hash,
cltv_expiry: msg.cltv_expiry,
state: HTLCState::RemoteAnnounced,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: Some(pending_forward_state),
});
Ok(())
}
/// Removes an outbound HTLC which has been commitment_signed by the remote end
#[inline]
fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<[u8; 32], HandleError> {
for mut htlc in self.pending_htlcs.iter_mut() {
if htlc.outbound && htlc.htlc_id == htlc_id {
match check_preimage {
None => {},
Some(payment_hash) =>
if payment_hash != htlc.payment_hash {
return Err(HandleError{err: "Remote tried to fulfill HTLC with an incorrect preimage", msg: None});
}
};
if htlc.state == HTLCState::LocalAnnounced {
return Err(HandleError{err: "Remote tried to fulfill HTLC before it had been committed", msg: None});
} else if htlc.state == HTLCState::Committed {
htlc.state = HTLCState::RemoteRemoved;
htlc.fail_reason = fail_reason;
} else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove || htlc.state == HTLCState::AwaitingRemovedRemoteRevoke || htlc.state == HTLCState::RemoteRemoved {
return Err(HandleError{err: "Remote tried to fulfill HTLC that they'd already fulfilled", msg: None});
} else {
panic!("Got a non-outbound state on an outbound HTLC");
}
return Ok(htlc.payment_hash.clone());
}
}
Err(HandleError{err: "Remote tried to fulfill/fail an HTLC we couldn't find", msg: None})
}
pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<ChannelMonitor, HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
}
let mut sha = Sha256::new();
sha.input(&msg.payment_preimage);
let mut payment_hash = [0; 32];
sha.result(&mut payment_hash);
self.channel_monitor.provide_payment_preimage(&payment_hash, &msg.payment_preimage);
self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)?;
Ok(self.channel_monitor.clone())
}
pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<[u8; 32], HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
}
self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
}
pub fn update_fail_malformed_htlc(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<(), HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
}
self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
Ok(())
}
pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitor), HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", msg: None});
}
let funding_script = self.get_funding_redeemscript();
let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false);
let local_commitment_txid = local_commitment_tx.0.txid();
let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_commitment_tx.0).sighash_all(&local_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey), "Invalid commitment tx signature from peer");
if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", msg: None});
}
let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
new_local_commitment_txn.push(local_commitment_tx.0.clone());
let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys);
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
secp_call!(self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key), "Invalid HTLC tx siganture from peer");
let htlc_sig = if htlc.offered {
let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
new_local_commitment_txn.push(htlc_tx);
htlc_sig
} else {
self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
};
htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
}
let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1)).unwrap();
let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
// Update state now that we've passed all the can-fail calls...
self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
let mut need_our_commitment = false;
for htlc in self.pending_htlcs.iter_mut() {
if htlc.state == HTLCState::RemoteAnnounced {
htlc.state = HTLCState::AwaitingRemoteRevokeToAnnounce;
need_our_commitment = true;
} else if htlc.state == HTLCState::RemoteRemoved {
htlc.state = HTLCState::AwaitingRemoteRevokeToRemove;
need_our_commitment = true;
}
}
// Finally delete all the LocalRemovedAwaitingCommitment HTLCs
// We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
let mut claimed_value_msat = 0;
self.pending_htlcs.retain(|htlc| {
if htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
claimed_value_msat += htlc.amount_msat;
false
} else { true }
});
self.value_to_self_msat += claimed_value_msat;
self.cur_local_commitment_transaction_number -= 1;
self.last_local_commitment_txn = new_local_commitment_txn;
let (our_commitment_signed, monitor_update) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
// If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
// we'll send one right away when we get the revoke_and_ack when we
// free_holding_cell_htlcs().
let (msg, monitor) = self.send_commitment_no_status_check()?;
(Some(msg), monitor)
} else { (None, self.channel_monitor.clone()) };
Ok((msgs::RevokeAndACK {
channel_id: self.channel_id,
per_commitment_secret: per_commitment_secret,
next_per_commitment_point: next_per_commitment_point,
}, our_commitment_signed, monitor_update))
}
/// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
/// fulfilling or failing the last pending HTLC)
fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, HandleError> {
if self.holding_cell_htlc_updates.len() != 0 {
let mut htlc_updates = Vec::new();
mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
let mut err = None;
for htlc_update in htlc_updates.drain(..) {
// Note that this *can* fail, though it should be due to rather-rare conditions on
// fee races with adding too many outputs which push our total payments just over
// the limit. In case its less rare than I anticipate, we may want to revisit
// handling this case better and maybe fufilling some of the HTLCs while attempting
// to rebalance channels.
if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
self.holding_cell_htlc_updates.push(htlc_update);
} else {
match &htlc_update {
&HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, payment_hash, ref onion_routing_packet, ..} => {
match self.send_htlc(amount_msat, payment_hash, cltv_expiry, onion_routing_packet.clone()) {
Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
Err(e) => {
err = Some(e);
}
}
},
&HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, .. } => {
match self.get_update_fulfill_htlc(payment_preimage) {
Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap().0),
Err(e) => {
err = Some(e);
}
}
},
&HTLCUpdateAwaitingACK::FailHTLC { payment_hash, ref err_packet } => {
match self.get_update_fail_htlc(&payment_hash, err_packet.clone()) {
Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
Err(e) => {
err = Some(e);
}
}
},
}
if err.is_some() {
self.holding_cell_htlc_updates.push(htlc_update);
}
}
}
//TODO: Need to examine the type of err - if its a fee issue or similar we may want to
//fail it back the route, if its a temporary issue we can ignore it...
match err {
None => {
let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
Ok(Some((msgs::CommitmentUpdate {
update_add_htlcs,
update_fulfill_htlcs,
update_fail_htlcs,
commitment_signed,
}, monitor_update)))
},
Some(e) => Err(e)
}
} else {
Ok(None)
}
}
/// Handles receiving a remote's revoke_and_ack. Note that we may return a new
/// commitment_signed message here in case we had pending outbound HTLCs to add which were
/// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
/// generating an appropriate error *after* the channel state has been updated based on the
/// revoke_and_ack message.
pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<PendingForwardHTLCInfo>, Vec<([u8; 32], HTLCFailReason)>, ChannelMonitor), HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", msg: None});
}
if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
if PublicKey::from_secret_key(&self.secp_ctx, &secp_call!(SecretKey::from_slice(&self.secp_ctx, &msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret")).unwrap() != their_prev_commitment_point {
return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", msg: None});
}
}
self.channel_monitor.provide_secret(self.cur_remote_commitment_transaction_number + 1, msg.per_commitment_secret, Some((self.cur_remote_commitment_transaction_number - 1, msg.next_per_commitment_point)))?;
// Update state now that we've passed all the can-fail calls...
// (note that we may still fail to generate the new commitment_signed message, but that's
// OK, we step the channel here and *then* if the new generation fails we can fail the
// channel based on that, but stepping stuff here should be safe either way.
self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
self.their_prev_commitment_point = Some(self.their_cur_commitment_point);
self.their_cur_commitment_point = msg.next_per_commitment_point;
self.cur_remote_commitment_transaction_number -= 1;
let mut to_forward_infos = Vec::new();
let mut revoked_htlcs = Vec::new();
let mut require_commitment = false;
let mut value_to_self_msat_diff: i64 = 0;
// We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
self.pending_htlcs.retain(|htlc| {
if htlc.state == HTLCState::LocalRemoved {
if htlc.local_removed_fulfilled { true } else { false }
} else if htlc.state == HTLCState::AwaitingRemovedRemoteRevoke {
if let Some(reason) = htlc.fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
revoked_htlcs.push((htlc.payment_hash, reason));
} else {
// They fulfilled, so we sent them money
value_to_self_msat_diff -= htlc.amount_msat as i64;
}
false
} else { true }
});
for htlc in self.pending_htlcs.iter_mut() {
if htlc.state == HTLCState::LocalAnnounced {
htlc.state = HTLCState::Committed;
} else if htlc.state == HTLCState::AwaitingRemoteRevokeToAnnounce {
htlc.state = HTLCState::AwaitingAnnouncedRemoteRevoke;
require_commitment = true;
} else if htlc.state == HTLCState::AwaitingAnnouncedRemoteRevoke {
htlc.state = HTLCState::Committed;
to_forward_infos.push(htlc.pending_forward_state.take().unwrap());
} else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove {
htlc.state = HTLCState::AwaitingRemovedRemoteRevoke;
require_commitment = true;
} else if htlc.state == HTLCState::LocalRemoved {
assert!(htlc.local_removed_fulfilled);
htlc.state = HTLCState::LocalRemovedAwaitingCommitment;
}
}
self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
match self.free_holding_cell_htlcs()? {
Some(commitment_update) => {
Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, commitment_update.1))
},
None => {
if require_commitment {
let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
Ok((Some(msgs::CommitmentUpdate {
update_add_htlcs: Vec::new(),
update_fulfill_htlcs: Vec::new(),
update_fail_htlcs: Vec::new(),
commitment_signed
}), to_forward_infos, revoked_htlcs, monitor_update))
} else {
Ok((None, to_forward_infos, revoked_htlcs, self.channel_monitor.clone()))
}
}
}
}
pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
if self.channel_outbound {
return Err(HandleError{err: "Non-funding remote tried to update channel fee", msg: None});
}
Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
self.channel_update_count += 1;
self.feerate_per_kw = msg.feerate_per_kw as u64;
Ok(())
}
pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<[u8; 32]>), HandleError> {
if self.channel_state < ChannelState::FundingSent as u32 {
self.channel_state = ChannelState::ShutdownComplete as u32;
self.channel_update_count += 1;
return Ok((None, None, Vec::new()));
}
for htlc in self.pending_htlcs.iter() {
if htlc.state == HTLCState::RemoteAnnounced {
return Err(HandleError{err: "Got shutdown with remote pending HTLCs", msg: None});
}
}
if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
return Err(HandleError{err: "Remote peer sent duplicate shutdown message", msg: None});
}
assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
// BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
// 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
if self.channel_outbound && msg.scriptpubkey.len() > 34 {
return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", msg: None});
}
//TODO: Check shutdown_scriptpubkey form as BOLT says we must? WHYYY
if self.their_shutdown_scriptpubkey.is_some() {
if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", msg: None});
}
} else {
self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
}
let our_closing_script = self.get_closing_scriptpubkey();
let (proposed_feerate, proposed_fee, our_sig) = if self.channel_outbound && self.pending_htlcs.is_empty() {
let mut proposed_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
if self.feerate_per_kw > proposed_feerate * 250 {
proposed_feerate = self.feerate_per_kw / 250;
}
let tx_weight = Self::get_closing_transaction_weight(&our_closing_script, &msg.scriptpubkey);
let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 4;
let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
let funding_redeemscript = self.get_funding_redeemscript();
let sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
(Some(proposed_feerate), Some(total_fee_satoshis), Some(self.secp_ctx.sign(&sighash, &self.local_keys.funding_key).unwrap()))
} else { (None, None, None) };
// From here on out, we may not fail!
self.channel_state |= ChannelState::RemoteShutdownSent as u32;
self.channel_update_count += 1;
// We can't send our shutdown until we've committed all of our pending HTLCs, but the
// remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
// cell HTLCs and return them to fail the payment.
let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
self.holding_cell_htlc_updates.retain(|htlc_update| {
match htlc_update {
&HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, .. } => {
dropped_outbound_htlcs.push(payment_hash.clone());
false
},
_ => true
}
});
for htlc in self.pending_htlcs.iter() {
if htlc.state == HTLCState::LocalAnnounced {
return Ok((None, None, dropped_outbound_htlcs));
}
}
let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
None
} else {
Some(msgs::Shutdown {
channel_id: self.channel_id,
scriptpubkey: our_closing_script,
})
};
self.channel_state |= ChannelState::LocalShutdownSent as u32;
self.channel_update_count += 1;
if self.pending_htlcs.is_empty() && self.channel_outbound {
// There are no more HTLCs and we're the funder, this means we start the closing_signed
// dance with an initial fee proposal!
self.last_sent_closing_fee = Some((proposed_feerate.unwrap(), proposed_fee.unwrap()));
Ok((our_shutdown, Some(msgs::ClosingSigned {
channel_id: self.channel_id,
fee_satoshis: proposed_fee.unwrap(),
signature: our_sig.unwrap(),
}), dropped_outbound_htlcs))
} else {
Ok((our_shutdown, None, dropped_outbound_htlcs))
}
}
pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), HandleError> {
if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", msg: None});
}
if !self.pending_htlcs.is_empty() {
return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", msg: None});
}
if msg.fee_satoshis > 21000000 * 10000000 {
return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", msg: None});
}
let funding_redeemscript = self.get_funding_redeemscript();
let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
if used_total_fee != msg.fee_satoshis {
return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", msg: None});
}
let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
match self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey) {
Ok(_) => {},
Err(_) => {
// The remote end may have decided to revoke their output due to inconsistent dust
// limits, so check for that case by re-checking the signature here.
closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
secp_call!(self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey), "Invalid closing tx signature from peer");
},
};
if let Some((_, last_fee)) = self.last_sent_closing_fee {
if last_fee == msg.fee_satoshis {
self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
self.channel_state = ChannelState::ShutdownComplete as u32;
self.channel_update_count += 1;
return Ok((None, Some(closing_tx)));
}
}
macro_rules! propose_new_feerate {
($new_feerate: expr) => {
let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 4, false);
sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key).unwrap();
self.last_sent_closing_fee = Some(($new_feerate, used_total_fee));
return Ok((Some(msgs::ClosingSigned {
channel_id: self.channel_id,
fee_satoshis: used_total_fee,
signature: our_sig,
}), None))
}
}
let proposed_sat_per_vbyte = msg.fee_satoshis * 4 / closing_tx.get_weight();
if self.channel_outbound {
let our_max_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal);
if proposed_sat_per_vbyte > our_max_feerate {
if let Some((last_feerate, _)) = self.last_sent_closing_fee {
if our_max_feerate <= last_feerate {
return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", msg: None});
}
}
propose_new_feerate!(our_max_feerate);
}
} else {
let our_min_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
if proposed_sat_per_vbyte < our_min_feerate {
if let Some((last_feerate, _)) = self.last_sent_closing_fee {
if our_min_feerate >= last_feerate {
return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", msg: None});
}
}
propose_new_feerate!(our_min_feerate);
}
}
let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
self.channel_state = ChannelState::ShutdownComplete as u32;
self.channel_update_count += 1;
Ok((Some(msgs::ClosingSigned {
channel_id: self.channel_id,
fee_satoshis: msg.fee_satoshis,
signature: our_sig,
}), Some(closing_tx)))
}
// Public utilities:
pub fn channel_id(&self) -> Uint256 {
self.channel_id
}
/// Gets the "user_id" value passed into the construction of this channel. It has no special
/// meaning and exists only to allow users to have a persistent identifier of a channel.
pub fn get_user_id(&self) -> u64 {
self.user_id
}
pub fn channel_monitor(&self) -> ChannelMonitor {
if self.channel_state < ChannelState::FundingCreated as u32 {
panic!("Can't get a channel monitor until funding has been created");
}
self.channel_monitor.clone()
}
/// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
/// is_usable() returns true).
pub fn get_short_channel_id(&self) -> Option<u64> {
self.short_channel_id
}
/// Returns the funding_txo we either got from our peer, or were given by
/// get_outbound_funding_created.
pub fn get_funding_txo(&self) -> Option<(Sha256dHash, u16)> {
self.channel_monitor.get_funding_txo()
}
pub fn get_their_node_id(&self) -> PublicKey {
self.their_node_id
}
pub fn get_our_htlc_minimum_msat(&self) -> u64 {
self.our_htlc_minimum_msat
}
pub fn get_value_satoshis(&self) -> u64 {
self.channel_value_satoshis
}
pub fn get_channel_update_count(&self) -> u32 {
self.channel_update_count
}
/// Gets the fee we'd want to charge for adding an HTLC output to this Channel
pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
// For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
// output value back into a transaction with the regular channel output:
// the fee cost of the HTLC-Success/HTLC-Timeout transaction:
let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT);
if self.channel_outbound {
// + the marginal fee increase cost to us in the commitment transaction:
res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC;
}
// + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
res += fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT * 250;
res as u32
}
/// Returns true if this channel is fully established and not known to be closing.
pub fn is_usable(&self) -> bool {
let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
(self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
}
/// Returns true if this channel is currently available for use. This is a superset of
/// is_usable() and considers things like the channel being temporarily disabled.
pub fn is_live(&self) -> bool {
self.is_usable()
}
/// Returns true if this channel is fully shut down. True here implies that no further actions
/// may/will be taken on this channel, and thus this object should be freed. Any future changes
/// will be handled appropriately by the chain monitor.
pub fn is_shutdown(&self) -> bool {
if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32 {
assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
true
} else { false }
}
/// Called by channelmanager based on chain blocks being connected.
/// Note that we only need to use this to detect funding_signed, anything else is handled by
/// the channel_monitor.
pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Option<msgs::FundingLocked> {
let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
if self.funding_tx_confirmations > 0 {
if header.bitcoin_hash() != self.last_block_connected {
self.last_block_connected = header.bitcoin_hash();
self.funding_tx_confirmations += 1;
if self.funding_tx_confirmations == CONF_TARGET as u64 {
if non_shutdown_state == ChannelState::FundingSent as u32 {
self.channel_state |= ChannelState::OurFundingLocked as u32;
} else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
self.channel_update_count += 1;
//TODO: Something about a state where we "lost confirmation"
} else if self.channel_state < ChannelState::ChannelFunded as u32 {
panic!("Started confirming a channel in a state pre-FundingSent?");
}
self.funding_tx_confirmed_in = header.bitcoin_hash();
//TODO: Note that this must be a duplicate of the previous commitment point they sent us,
//as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
//they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
//a protocol oversight, but I assume I'm just missing something.
let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret).unwrap();
return Some(msgs::FundingLocked {
channel_id: self.channel_id,
next_per_commitment_point: next_per_commitment_point,
});
}
}
}
if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().0 {
let txo_idx = self.channel_monitor.get_funding_txo().unwrap().1 as usize;
if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
tx.output[txo_idx].value != self.channel_value_satoshis {
self.channel_state = ChannelState::ShutdownComplete as u32;
self.channel_update_count += 1;
} else {
self.funding_tx_confirmations = 1;
self.short_channel_id = Some(((height as u64) << (5*8)) |
((*index_in_block as u64) << (2*8)) |
((self.channel_monitor.get_funding_txo().unwrap().1 as u64) << (2*8)));
}
}
}
}
None
}
/// Called by channelmanager based on chain blocks being disconnected.
/// Returns true if we need to close the channel now due to funding transaction
/// unconfirmation/reorg.
pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
if self.funding_tx_confirmations > 0 {
self.funding_tx_confirmations -= 1;
if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
return true;
}
}
if header.bitcoin_hash() == self.funding_tx_confirmed_in {
self.funding_tx_confirmations = CONF_TARGET as u64 - 1;
}
false
}
// Methods to get unprompted messages to send to the remote end (or where we already returned
// something in the handler for the message that prompted this message):
pub fn get_open_channel(&self, chain_hash: Sha256dHash, fee_estimator: &FeeEstimator) -> Result<msgs::OpenChannel, HandleError> {
if !self.channel_outbound {
panic!("Tried to open a channel for an inbound channel?");
}
if self.channel_state != ChannelState::OurInitSent as u32 {
return Err(HandleError{err: "Cannot generate an open_channel after we've moved forward", msg: None});
}
if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
panic!("Tried to send an open_channel for a channel that has already advanced");
}
let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
Ok(msgs::OpenChannel {
chain_hash: chain_hash,
temporary_channel_id: self.channel_id,
funding_satoshis: self.channel_value_satoshis,
push_msat: 0, //TODO: Something about feerate?
dust_limit_satoshis: self.our_dust_limit_satoshis,
max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
htlc_minimum_msat: self.our_htlc_minimum_msat,
feerate_per_kw: fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background) as u32 * 250,
to_self_delay: BREAKDOWN_TIMEOUT,
max_accepted_htlcs: OUR_MAX_HTLCS,
funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap(),
revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key).unwrap(),
payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap(),
delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key).unwrap(),
htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap(),
first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret).unwrap(),
channel_flags: if self.announce_publicly {1} else {0},
shutdown_scriptpubkey: None,
})
}
pub fn get_accept_channel(&self) -> Result<msgs::AcceptChannel, HandleError> {
if self.channel_outbound {
panic!("Tried to send accept_channel for an outbound channel?");
}
if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
panic!("Tried to send accept_channel after channel had moved forward");
}
if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
panic!("Tried to send an accept_channel for a channel that has already advanced");
}
let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
Ok(msgs::AcceptChannel {
temporary_channel_id: self.channel_id,
dust_limit_satoshis: self.our_dust_limit_satoshis,
max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
htlc_minimum_msat: self.our_htlc_minimum_msat,
minimum_depth: CONF_TARGET,
to_self_delay: BREAKDOWN_TIMEOUT,
max_accepted_htlcs: OUR_MAX_HTLCS,
funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap(),
revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key).unwrap(),
payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap(),
delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key).unwrap(),
htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap(),
first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret).unwrap(),
shutdown_scriptpubkey: None,
})
}
fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), HandleError> {
let funding_script = self.get_funding_redeemscript();
let remote_keys = self.build_remote_transaction_keys()?;
let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
// We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap(), remote_initial_commitment_tx))
}
/// Updates channel state with knowledge of the funding transaction's txid/index, and generates
/// a funding_created message for the remote peer.
/// Panics if called at some time other than immediately after initial handshake, if called twice,
/// or if called on an inbound channel.
/// Note that channel_id changes during this call!
/// Do NOT broadcast the funding transaction until after a successful funding_signed call!
pub fn get_outbound_funding_created(&mut self, funding_txid: Sha256dHash, funding_output_index: u16) -> Result<(msgs::FundingCreated, ChannelMonitor), HandleError> {
if !self.channel_outbound {
panic!("Tried to create outbound funding_created message on an inbound channel!");
}
if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
panic!("Tried to get a funding_created messsage at a time other than immediately after initial handshake completion (or tried to get funding_created twice)");
}
if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
}
self.channel_monitor.set_funding_info(funding_txid, funding_output_index);
let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
Ok(res) => res,
Err(e) => {
self.channel_monitor.unset_funding_info();
return Err(e);
}
};
let temporary_channel_id = self.channel_id;
// Now that we're past error-generating stuff, update our local state:
self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new());
self.channel_state = ChannelState::FundingCreated as u32;
let funding_txo = self.channel_monitor.get_funding_txo().unwrap();
self.channel_id = funding_txo.0.into_be() ^ Uint256::from_u64(funding_txo.1 as u64).unwrap(); //TODO: or le?
self.cur_remote_commitment_transaction_number -= 1;
Ok((msgs::FundingCreated {
temporary_channel_id: temporary_channel_id,
funding_txid: funding_txid,
funding_output_index: funding_output_index,
signature: our_signature
}, self.channel_monitor.clone()))
}
/// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
/// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
/// available for use (have exchanged FundingLocked messages in both directions. Should be used
/// for both loose and in response to an AnnouncementSignatures message from the remote peer.
/// Note that you can get an announcement for a channel which is closing, though you should
/// likely not announce such a thing. In case its already been announced, a channel_update
/// message can mark the channel disabled.
pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), HandleError> {
if !self.announce_publicly {
return Err(HandleError{err: "Channel is not available for public announcements", msg: None});
}
if self.channel_state & (ChannelState::ChannelFunded as u32) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Cannot get a ChannelAnnouncement until the channel funding has been locked", msg: None});
}
let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap();
let msg = msgs::UnsignedChannelAnnouncement {
features: msgs::GlobalFeatures::new(),
chain_hash: chain_hash,
short_channel_id: self.get_short_channel_id().unwrap(),
node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey },
bitcoin_key_2: if were_node_one { self.their_funding_pubkey } else { our_bitcoin_key },
};
let msghash = Message::from_slice(&Sha256dHash::from_data(&msg.encode()[..])[..]).unwrap();
let sig = self.secp_ctx.sign(&msghash, &self.local_keys.funding_key).unwrap();
Ok((msg, sig))
}
// Send stuff to our remote peers:
/// Adds a pending outbound HTLC to this channel, note that you probably want
/// send_htlc_and_commit instead cause you'll want both messages at once.
/// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
/// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
/// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", msg: None});
}
if amount_msat > self.channel_value_satoshis * 1000 {
return Err(HandleError{err: "Cannot send more than the total value of the channel", msg: None});
}
if amount_msat < self.their_htlc_minimum_msat {
return Err(HandleError{err: "Cannot send less than their minimum HTLC value", msg: None});
}
let (_, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(false);
if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", msg: None});
}
//TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
// Check their_max_htlc_value_in_flight_msat
if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", msg: None});
}
// Check their_channel_reserve_satoshis:
if htlc_inbound_value_msat + htlc_outbound_value_msat + amount_msat + (self.channel_value_satoshis * 1000 - self.value_to_self_msat) > (self.channel_value_satoshis - self.their_channel_reserve_satoshis) * 1000 {
return Err(HandleError{err: "Cannot send value that would put us over our reserve value", msg: None});
}
//TODO: Check cltv_expiry? Do this in channel manager?
// Now update local state:
if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
//TODO: Check the limits *including* other pending holding cell HTLCs!
self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
amount_msat: amount_msat,
payment_hash: payment_hash,
cltv_expiry: cltv_expiry,
onion_routing_packet: onion_routing_packet,
time_created: Instant::now(),
});
return Ok(None);
}
self.pending_htlcs.push(HTLCOutput {
outbound: true,
htlc_id: self.next_local_htlc_id,
amount_msat: amount_msat,
payment_hash: payment_hash.clone(),
cltv_expiry: cltv_expiry,
state: HTLCState::LocalAnnounced,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: None
});
let res = msgs::UpdateAddHTLC {
channel_id: self.channel_id,
htlc_id: self.next_local_htlc_id,
amount_msat: amount_msat,
payment_hash: payment_hash,
cltv_expiry: cltv_expiry,
onion_routing_packet: onion_routing_packet,
};
self.next_local_htlc_id += 1;
Ok(Some(res))
}
/// Creates a signed commitment transaction to send to the remote peer.
pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(HandleError{err: "Cannot create commitment tx until channel is fully established", msg: None});
}
if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
return Err(HandleError{err: "Cannot create commitment tx until remote revokes their previous commitment", msg: None});
}
let mut have_updates = false; // TODO initialize with "have we sent a fee update?"
for htlc in self.pending_htlcs.iter() {
if htlc.state == HTLCState::LocalAnnounced {
have_updates = true;
}
if have_updates { break; }
}
if !have_updates {
return Err(HandleError{err: "Cannot create commitment tx until we have some updates to send", msg: None});
}
self.send_commitment_no_status_check()
}
/// Only fails in case of bad keys
fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
let funding_script = self.get_funding_redeemscript();
// We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
// fail to generate this, we still are at least at a position where upgrading their status
// is acceptable.
for htlc in self.pending_htlcs.iter_mut() {
if htlc.state == HTLCState::AwaitingRemoteRevokeToAnnounce {
htlc.state = HTLCState::AwaitingAnnouncedRemoteRevoke;
} else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove {
htlc.state = HTLCState::AwaitingRemovedRemoteRevoke;
}
}
let remote_keys = self.build_remote_transaction_keys()?;
let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true);
let remote_commitment_txid = remote_commitment_tx.0.txid();
let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_commitment_tx.0).sighash_all(&remote_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
let our_sig = self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap();
let mut htlc_sigs = Vec::new();
for ref htlc in remote_commitment_tx.1.iter() {
let htlc_tx = self.build_htlc_transaction(&remote_commitment_txid, htlc, false, &remote_keys);
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &remote_keys);
let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &remote_keys.per_commitment_point, &self.local_keys.htlc_base_key));
htlc_sigs.push(self.secp_ctx.sign(&htlc_sighash, &our_htlc_key).unwrap());
}
// Update state now that we've passed all the can-fail calls...
self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1);
self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
Ok((msgs::CommitmentSigned {
channel_id: self.channel_id,
signature: our_sig,
htlc_signatures: htlc_sigs,
}, self.channel_monitor.clone()))
}
/// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
/// to send to the remote peer in one go.
/// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
/// more info.
pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
match self.send_htlc(amount_msat, payment_hash, cltv_expiry, onion_routing_packet)? {
Some(update_add_htlc) => {
let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
},
None => Ok(None)
}
}
/// Begins the shutdown process, getting a message for the remote peer and returning all
/// holding cell HTLCs for payment failure.
pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<[u8; 32]>), HandleError> {
for htlc in self.pending_htlcs.iter() {
if htlc.state == HTLCState::LocalAnnounced {
return Err(HandleError{err: "Cannot begin shutdown with pending HTLCs, call send_commitment first", msg: None});
}
}
if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
return Err(HandleError{err: "Shutdown already in progress", msg: None});
}
assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
let our_closing_script = self.get_closing_scriptpubkey();
// From here on out, we may not fail!
if self.channel_state < ChannelState::FundingSent as u32 {
self.channel_state = ChannelState::ShutdownComplete as u32;
} else {
self.channel_state |= ChannelState::LocalShutdownSent as u32;
}
self.channel_update_count += 1;
// We can't send our shutdown until we've committed all of our pending HTLCs, but the
// remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
// cell HTLCs and return them to fail the payment.
let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
self.holding_cell_htlc_updates.retain(|htlc_update| {
match htlc_update {
&HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, .. } => {
dropped_outbound_htlcs.push(payment_hash.clone());
false
},
_ => true
}
});
Ok((msgs::Shutdown {
channel_id: self.channel_id,
scriptpubkey: our_closing_script,
}, dropped_outbound_htlcs))
}
/// Gets the latest commitment transaction and any dependant transactions for relay (forcing
/// shutdown of this channel - no more calls into this Channel may be made afterwards.
pub fn force_shutdown(&mut self) -> Vec<Transaction> {
assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
self.channel_state = ChannelState::ShutdownComplete as u32;
self.channel_update_count += 1;
let mut res = Vec::new();
mem::swap(&mut res, &mut self.last_local_commitment_txn);
res
}
}
#[cfg(test)]
mod tests {
use bitcoin::util::misc::hex_bytes;
use bitcoin::util::hash::Sha256dHash;
use bitcoin::util::bip143;
use bitcoin::network::serialize::serialize;
use bitcoin::blockdata::transaction::Transaction;
use ln::channel::{Channel,ChannelKeys,HTLCOutput,HTLCState,HTLCOutputInCommitment,TxCreationKeys};
use ln::chan_utils;
use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
use secp256k1::{Secp256k1,Message,Signature};
use secp256k1::key::{SecretKey,PublicKey};
use crypto::sha2::Sha256;
use crypto::digest::Digest;
struct TestFeeEstimator {
fee_est: u64
}
impl FeeEstimator for TestFeeEstimator {
fn get_est_sat_per_vbyte(&self, _: ConfirmationTarget) -> u64 {
self.fee_est
}
}
#[test]
fn outbound_commitment_test() {
// Test vectors from BOLT 3 Appendix C:
let feeest = TestFeeEstimator{fee_est: 15000/250};
let secp_ctx = Secp256k1::new();
let chan_keys = ChannelKeys {
funding_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
payment_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
// These aren't set in the test vectors:
revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
channel_close_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
channel_monitor_claim_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
commitment_seed: [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff],
};
assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).unwrap().serialize()[..],
hex_bytes("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
let mut chan = Channel::new_outbound(&feeest, chan_keys, PublicKey::new(), 10000000, false, 42); // Nothing uses their network key in this test
chan.their_to_self_delay = 144;
chan.our_dust_limit_satoshis = 546;
chan.channel_monitor.set_funding_info(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
chan.their_payment_basepoint = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()).unwrap();
assert_eq!(chan.their_payment_basepoint.serialize()[..],
hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
chan.their_funding_pubkey = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13").unwrap()[..]).unwrap()).unwrap();
assert_eq!(chan.their_funding_pubkey.serialize()[..],
hex_bytes("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
chan.their_htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()).unwrap();
assert_eq!(chan.their_htlc_basepoint.serialize()[..],
hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
chan.their_revocation_basepoint = PublicKey::from_slice(&secp_ctx, &hex_bytes("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap();
// We can't just use build_local_transaction_keys here as the per_commitment_secret is not
// derived from a commitment_seed, so instead we copy it here and call
// build_commitment_transaction.
let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.delayed_payment_base_key).unwrap();
let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex_bytes("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret).unwrap();
let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.htlc_base_key).unwrap();
let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &chan.their_revocation_basepoint, &chan.their_payment_basepoint, &chan.their_htlc_basepoint).unwrap();
let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
macro_rules! test_commitment {
( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
unsigned_tx = chan.build_commitment_transaction(42, &keys, true, false);
let their_signature = Signature::from_der(&secp_ctx, &hex_bytes($their_sig_hex).unwrap()[..]).unwrap();
let sighash = Message::from_slice(&bip143::SighashComponents::new(&unsigned_tx.0).sighash_all(&unsigned_tx.0.input[0], &chan.get_funding_redeemscript(), chan.channel_value_satoshis)[..]).unwrap();
secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey).unwrap();
chan.sign_commitment_transaction(&mut unsigned_tx.0, &their_signature);
assert_eq!(serialize(&unsigned_tx.0).unwrap()[..],
hex_bytes($tx_hex).unwrap()[..]);
};
}
macro_rules! test_htlc_output {
( $htlc_idx: expr, $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr ) => {
let remote_signature = Signature::from_der(&secp_ctx, &hex_bytes($their_sig_hex).unwrap()[..]).unwrap();
let ref htlc = unsigned_tx.1[$htlc_idx];
let mut htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys);
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
let mut preimage: Option<[u8; 32]> = None;
if !htlc.offered {
for i in 0..5 {
let mut sha = Sha256::new();
sha.input(&[i; 32]);
let mut out = [0; 32];
sha.result(&mut out);
if out == htlc.payment_hash {
preimage = Some([i; 32]);
}
}
assert!(preimage.is_some());
}
chan.sign_htlc_transaction(&mut htlc_tx, &remote_signature, &preimage, &htlc, &keys).unwrap();
assert_eq!(serialize(&htlc_tx).unwrap()[..],
hex_bytes($tx_hex).unwrap()[..]);
};
}
{
// simple commitment tx with no HTLCs
chan.value_to_self_msat = 7000000000;
test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
"3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
"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");
}
chan.pending_htlcs.push({
let mut out = HTLCOutput{
htlc_id: 0,
outbound: false,
amount_msat: 1000000,
cltv_expiry: 500,
payment_hash: [0; 32],
state: HTLCState::Committed,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: None,
};
let mut sha = Sha256::new();
sha.input(&hex_bytes("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
sha.result(&mut out.payment_hash);
out
});
chan.pending_htlcs.push({
let mut out = HTLCOutput{
htlc_id: 1,
outbound: false,
amount_msat: 2000000,
cltv_expiry: 501,
payment_hash: [0; 32],
state: HTLCState::Committed,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: None,
};
let mut sha = Sha256::new();
sha.input(&hex_bytes("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
sha.result(&mut out.payment_hash);
out
});
chan.pending_htlcs.push({
let mut out = HTLCOutput{
htlc_id: 2,
outbound: true,
amount_msat: 2000000,
cltv_expiry: 502,
payment_hash: [0; 32],
state: HTLCState::Committed,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: None,
};
let mut sha = Sha256::new();
sha.input(&hex_bytes("0202020202020202020202020202020202020202020202020202020202020202").unwrap());
sha.result(&mut out.payment_hash);
out
});
chan.pending_htlcs.push({
let mut out = HTLCOutput{
htlc_id: 3,
outbound: true,
amount_msat: 3000000,
cltv_expiry: 503,
payment_hash: [0; 32],
state: HTLCState::Committed,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: None,
};
let mut sha = Sha256::new();
sha.input(&hex_bytes("0303030303030303030303030303030303030303030303030303030303030303").unwrap());
sha.result(&mut out.payment_hash);
out
});
chan.pending_htlcs.push({
let mut out = HTLCOutput{
htlc_id: 4,
outbound: false,
amount_msat: 4000000,
cltv_expiry: 504,
payment_hash: [0; 32],
state: HTLCState::Committed,
fail_reason: None,
local_removed_fulfilled: false,
pending_forward_state: None,
};
let mut sha = Sha256::new();
sha.input(&hex_bytes("0404040404040404040404040404040404040404040404040404040404040404").unwrap());
sha.result(&mut out.payment_hash);
out
});
{
// commitment tx with all five HTLCs untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 0;
test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
"30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
"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");
assert_eq!(unsigned_tx.1.len(), 5);
test_htlc_output!(0,
"304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
"304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
"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");
test_htlc_output!(1,
"3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
"3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
"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");
test_htlc_output!(2,
"304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
"3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
"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");
test_htlc_output!(3,
"3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
"30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
"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");
test_htlc_output!(4,
"304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
"30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
"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");
}
{
// commitment tx with seven outputs untrimmed (maximum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 647;
test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
"304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
"02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8007e80300000000000022002052bfef0479d7b293c27e0f1eb294bea154c63a3294ef092c19af51409bce0e2ad007000000000000220020403d394747cae42e98ff01734ad5c08f82ba123d3d9a620abda88989651e2ab5d007000000000000220020748eba944fedc8827f6b06bc44678f93c0f9e6078b35c6331ed31e75f8ce0c2db80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de843110e09c6a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e040048304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d116301483045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b01475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
assert_eq!(unsigned_tx.1.len(), 5);
test_htlc_output!(0,
"30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
"304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
"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");
test_htlc_output!(1,
"304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
"304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
"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");
test_htlc_output!(2,
"304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
"3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
"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");
test_htlc_output!(3,
"30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
"3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
"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");
test_htlc_output!(4,
"3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
"304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
"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");
}
{
// commitment tx with six outputs untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 648;
test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
"3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
"02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8006d007000000000000220020403d394747cae42e98ff01734ad5c08f82ba123d3d9a620abda88989651e2ab5d007000000000000220020748eba944fedc8827f6b06bc44678f93c0f9e6078b35c6331ed31e75f8ce0c2db80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de8431104e9d6a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0400483045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de01473044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b05701475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
assert_eq!(unsigned_tx.1.len(), 4);
test_htlc_output!(0,
"3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
"3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
"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");
test_htlc_output!(1,
"3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
"304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
"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");
test_htlc_output!(2,
"3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
"304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
"02000000000101579c183eca9e8236a5d7f5dcd79cfec32c497fdc0ec61533cde99ecd436cadd1020000000000000000010b0a0000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c20147304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda301008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000");
test_htlc_output!(3,
"3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
"304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
"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");
}
{
// commitment tx with six outputs untrimmed (maximum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 2069;
test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
"304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
"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");
assert_eq!(unsigned_tx.1.len(), 4);
test_htlc_output!(0,
"3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
"3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
"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");
test_htlc_output!(1,
"3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
"3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
"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");
test_htlc_output!(2,
"3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
"304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
"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");
test_htlc_output!(3,
"30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
"304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
"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");
}
{
// commitment tx with five outputs untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 2070;
test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
"30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
"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");
assert_eq!(unsigned_tx.1.len(), 3);
test_htlc_output!(0,
"3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
"3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
"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");
test_htlc_output!(1,
"3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
"3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
"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");
test_htlc_output!(2,
"3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
"304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
"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");
}
{
// commitment tx with five outputs untrimmed (maximum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 2194;
test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
"304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
"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");
assert_eq!(unsigned_tx.1.len(), 3);
test_htlc_output!(0,
"30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
"3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
"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");
test_htlc_output!(1,
"30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
"304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
"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");
test_htlc_output!(2,
"3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
"3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
"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");
}
{
// commitment tx with four outputs untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 2195;
test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
"304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
"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");
assert_eq!(unsigned_tx.1.len(), 2);
test_htlc_output!(0,
"3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
"3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
"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");
test_htlc_output!(1,
"3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
"30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
"020000000001014e16c488fa158431c1a82e8f661240ec0a71ba0ce92f2721a6538c510226ad5c0100000000000000000199090000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92014730440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
}
{
// commitment tx with four outputs untrimmed (maximum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 3702;
test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
"304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
"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");
assert_eq!(unsigned_tx.1.len(), 2);
test_htlc_output!(0,
"3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
"304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
"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");
test_htlc_output!(1,
"3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
"30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
"02000000000101b8de11eb51c22498fe39722c7227b6e55ff1a94146cf638458cb9bc6a060d3a30100000000000000000176050000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9014730440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
}
{
// commitment tx with three outputs untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 3703;
test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
"3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
"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");
assert_eq!(unsigned_tx.1.len(), 1);
test_htlc_output!(0,
"3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
"3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
"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");
}
{
// commitment tx with three outputs untrimmed (maximum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 4914;
test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
"304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
"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");
assert_eq!(unsigned_tx.1.len(), 1);
test_htlc_output!(0,
"3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
"304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
"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");
}
{
// commitment tx with two outputs untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 4915;
test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
"3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
"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");
assert_eq!(unsigned_tx.1.len(), 0);
}
{
// commitment tx with two outputs untrimmed (maximum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 9651180;
test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
"30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
"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");
assert_eq!(unsigned_tx.1.len(), 0);
}
{
// commitment tx with one output untrimmed (minimum feerate)
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 9651181;
test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
"3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
"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");
assert_eq!(unsigned_tx.1.len(), 0);
}
{
// commitment tx with fee greater than funder amount
chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
chan.feerate_per_kw = 9651936;
test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
"3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
"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");
assert_eq!(unsigned_tx.1.len(), 0);
}
}
#[test]
fn test_per_commitment_secret_gen() {
// Test vectors from BOLT 3 Appendix D:
let mut seed = [0; 32];
seed[0..32].clone_from_slice(&hex_bytes("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
seed[0..32].clone_from_slice(&hex_bytes("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
hex_bytes("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
hex_bytes("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
seed[0..32].clone_from_slice(&hex_bytes("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
assert_eq!(chan_utils::build_commitment_secret(seed, 1),
hex_bytes("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
}
#[test]
fn test_key_derivation() {
// Test vectors from BOLT 3 Appendix E:
let secp_ctx = Secp256k1::new();
let base_secret = SecretKey::from_slice(&secp_ctx, &hex_bytes("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex_bytes("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret).unwrap();
assert_eq!(base_point.serialize()[..], hex_bytes("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret).unwrap();
assert_eq!(per_commitment_point.serialize()[..], hex_bytes("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
hex_bytes("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
SecretKey::from_slice(&secp_ctx, &hex_bytes("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
hex_bytes("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
SecretKey::from_slice(&secp_ctx, &hex_bytes("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());
}
}