use ln::{PaymentHash, PaymentPreimage};
use ln::msgs::DecodeError;
-use util::ser::{Readable, Writeable, Writer, MAX_BUF_SIZE};
+use util::ser::{Readable, Writeable, Writer};
use util::byte_utils;
use bitcoin::hash_types::WPubkeyHash;
use bitcoin::secp256k1::Error as SecpError;
use bitcoin::secp256k1;
+use io;
use prelude::*;
use core::cmp;
use ln::chan_utils;
use util::transaction_utils::sort_outputs;
use ln::channel::INITIAL_COMMITMENT_NUMBER;
-use std::io::Read;
use core::ops::Deref;
use chain;
-// Maximum size of a serialized HTLCOutputInCommitment
-pub(crate) const HTLC_OUTPUT_IN_COMMITMENT_SIZE: usize = 1 + 8 + 4 + 32 + 5;
-
pub(crate) const MAX_HTLCS: u16 = 483;
-// This checks that the buffer size is greater than the maximum possible size for serialized HTLCS
-const _EXCESS_BUFFER_SIZE: usize = MAX_BUF_SIZE - MAX_HTLCS as usize * HTLC_OUTPUT_IN_COMMITMENT_SIZE;
-
pub(super) const HTLC_SUCCESS_TX_WEIGHT: u64 = 703;
pub(super) const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663;
}
impl Writeable for CounterpartyCommitmentSecrets {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
for &(ref secret, ref idx) in self.old_secrets.iter() {
writer.write_all(secret)?;
writer.write_all(&byte_utils::be64_to_array(*idx))?;
}
- write_tlv_fields!(writer, {}, {});
+ write_tlv_fields!(writer, {});
Ok(())
}
}
impl Readable for CounterpartyCommitmentSecrets {
- fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
+ fn read<R: io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
let mut old_secrets = [([0; 32], 1 << 48); 49];
for &mut (ref mut secret, ref mut idx) in old_secrets.iter_mut() {
*secret = Readable::read(reader)?;
*idx = Readable::read(reader)?;
}
- read_tlv_fields!(reader, {}, {});
+ read_tlv_fields!(reader, {});
Ok(Self { old_secrets })
}
}
}
impl_writeable_tlv_based!(TxCreationKeys, {
- (0, per_commitment_point),
- (2, revocation_key),
- (4, broadcaster_htlc_key),
- (6, countersignatory_htlc_key),
- (8, broadcaster_delayed_payment_key),
-}, {}, {});
+ (0, per_commitment_point, required),
+ (2, revocation_key, required),
+ (4, broadcaster_htlc_key, required),
+ (6, countersignatory_htlc_key, required),
+ (8, broadcaster_delayed_payment_key, required),
+});
/// One counterparty's public keys which do not change over the life of a channel.
#[derive(Clone, PartialEq)]
}
impl_writeable_tlv_based!(ChannelPublicKeys, {
- (0, funding_pubkey),
- (2, revocation_basepoint),
- (4, payment_point),
- (6, delayed_payment_basepoint),
- (8, htlc_basepoint),
-}, {}, {});
+ (0, funding_pubkey, required),
+ (2, revocation_basepoint, required),
+ (4, payment_point, required),
+ (6, delayed_payment_basepoint, required),
+ (8, htlc_basepoint, required),
+});
impl TxCreationKeys {
/// Create per-state keys from channel base points and the per-commitment point.
}
impl_writeable_tlv_based!(HTLCOutputInCommitment, {
- (0, offered),
- (2, amount_msat),
- (4, cltv_expiry),
- (6, payment_hash),
-}, {
- (8, transaction_output_index)
-}, {});
+ (0, offered, required),
+ (2, amount_msat, required),
+ (4, cltv_expiry, required),
+ (6, payment_hash, required),
+ (8, transaction_output_index, option),
+});
#[inline]
pub(crate) fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, broadcaster_htlc_key: &PublicKey, countersignatory_htlc_key: &PublicKey, revocation_key: &PublicKey) -> Script {
}.push_opcode(opcodes::all::OP_PUSHNUM_2).push_opcode(opcodes::all::OP_CHECKMULTISIG).into_script()
}
-/// panics if htlc.transaction_output_index.is_none()!
-pub fn build_htlc_transaction(prev_hash: &Txid, feerate_per_kw: u32, contest_delay: u16, htlc: &HTLCOutputInCommitment, broadcaster_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
+/// Builds an unsigned HTLC-Success or HTLC-Timeout transaction from the given channel and HTLC
+/// parameters. This is used by [`TrustedCommitmentTransaction::get_htlc_sigs`] to fetch the
+/// transaction which needs signing, and can be used to construct an HTLC transaction which is
+/// broadcastable given a counterparty HTLC signature.
+///
+/// Panics if htlc.transaction_output_index.is_none() (as such HTLCs do not appear in the
+/// commitment transaction).
+pub fn build_htlc_transaction(commitment_txid: &Txid, feerate_per_kw: u32, contest_delay: u16, htlc: &HTLCOutputInCommitment, broadcaster_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
let mut txins: Vec<TxIn> = Vec::new();
txins.push(TxIn {
previous_output: OutPoint {
- txid: prev_hash.clone(),
+ txid: commitment_txid.clone(),
vout: htlc.transaction_output_index.expect("Can't build an HTLC transaction for a dust output"),
},
script_sig: Script::new(),
}
}
+/// Gets the witnessScript for an anchor output from the funding public key.
+/// The witness in the spending input must be:
+/// <BIP 143 funding_signature>
+/// After 16 blocks of confirmation, an alternative satisfying witness could be:
+/// <>
+#[inline]
+pub(crate) fn get_anchor_redeemscript(funding_pubkey: &PublicKey) -> Script {
+ Builder::new().push_slice(&funding_pubkey.serialize()[..])
+ .push_opcode(opcodes::all::OP_CHECKSIG)
+ .push_opcode(opcodes::all::OP_IFDUP)
+ .push_opcode(opcodes::all::OP_NOTIF)
+ .push_int(16)
+ .push_opcode(opcodes::all::OP_CSV)
+ .push_opcode(opcodes::all::OP_ENDIF)
+ .into_script()
+}
+
/// Per-channel data used to build transactions in conjunction with the per-commitment data (CommitmentTransaction).
/// The fields are organized by holder/counterparty.
///
}
impl_writeable_tlv_based!(CounterpartyChannelTransactionParameters, {
- (0, pubkeys),
- (2, selected_contest_delay),
-}, {}, {});
+ (0, pubkeys, required),
+ (2, selected_contest_delay, required),
+});
impl_writeable_tlv_based!(ChannelTransactionParameters, {
- (0, holder_pubkeys),
- (2, holder_selected_contest_delay),
- (4, is_outbound_from_holder),
-}, {
- (6, counterparty_parameters),
- (8, funding_outpoint),
-}, {});
+ (0, holder_pubkeys, required),
+ (2, holder_selected_contest_delay, required),
+ (4, is_outbound_from_holder, required),
+ (6, counterparty_parameters, option),
+ (8, funding_outpoint, option),
+});
/// Static channel fields used to build transactions given per-commitment fields, organized by
/// broadcaster/countersignatory.
}
impl_writeable_tlv_based!(HolderCommitmentTransaction, {
- (0, inner),
- (2, counterparty_sig),
- (4, holder_sig_first),
-}, {}, {
- (6, counterparty_htlc_sigs),
+ (0, inner, required),
+ (2, counterparty_sig, required),
+ (4, holder_sig_first, required),
+ (6, counterparty_htlc_sigs, vec_type),
});
impl HolderCommitmentTransaction {
}
impl_writeable_tlv_based!(BuiltCommitmentTransaction, {
- (0, transaction),
- (2, txid)
-}, {}, {});
+ (0, transaction, required),
+ (2, txid, required),
+});
impl BuiltCommitmentTransaction {
/// Get the SIGHASH_ALL sighash value of the transaction.
}
}
-/// (C-not exported) as users never need to call this directly
-impl Writeable for Vec<HTLCOutputInCommitment> {
- #[inline]
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
- (self.len() as u16).write(w)?;
- for e in self.iter() {
- e.write(w)?;
- }
- Ok(())
- }
-}
-
-/// (C-not exported) as users never need to call this directly
-impl Readable for Vec<HTLCOutputInCommitment> {
- #[inline]
- fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
- let len: u16 = Readable::read(r)?;
- let byte_size = (len as usize)
- .checked_mul(HTLC_OUTPUT_IN_COMMITMENT_SIZE)
- .ok_or(DecodeError::BadLengthDescriptor)?;
- if byte_size > MAX_BUF_SIZE {
- return Err(DecodeError::BadLengthDescriptor);
- }
- let mut ret = Vec::with_capacity(len as usize);
- for _ in 0..len { ret.push(HTLCOutputInCommitment::read(r)?); }
- Ok(ret)
- }
-}
-
impl_writeable_tlv_based!(CommitmentTransaction, {
- (0, commitment_number),
- (2, to_broadcaster_value_sat),
- (4, to_countersignatory_value_sat),
- (6, feerate_per_kw),
- (8, htlcs),
- (10, keys),
- (12, built),
-}, {}, {});
+ (0, commitment_number, required),
+ (2, to_broadcaster_value_sat, required),
+ (4, to_countersignatory_value_sat, required),
+ (6, feerate_per_kw, required),
+ (8, keys, required),
+ (10, built, required),
+ (12, htlcs, vec_type),
+});
impl CommitmentTransaction {
/// Construct an object of the class while assigning transaction output indices to HTLCs.
}
}
-/// Get the transaction number obscure factor
+/// Commitment transaction numbers which appear in the transactions themselves are XOR'd with a
+/// shared secret first. This prevents on-chain observers from discovering how many commitment
+/// transactions occurred in a channel before it was closed.
+///
+/// This function gets the shared secret from relevant channel public keys and can be used to
+/// "decrypt" the commitment transaction number given a commitment transaction on-chain.
pub fn get_commitment_transaction_number_obscure_factor(
broadcaster_payment_basepoint: &PublicKey,
countersignatory_payment_basepoint: &PublicKey,
projects / rust-lightning / blobdiff