X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=src%2Fln%2Fchan_utils.rs;h=eab80a54e797cd9489e2fe25c59dc76f15375c48;hb=3b09db80eaff12af791e28eddb03f3b44957ab5f;hp=eb85c0e1f3e1a985d39be9161c3d9e670ed50a4e;hpb=511c5319f1b50438ed21e5c922c0c9ef0b258cac;p=rust-lightning diff --git a/src/ln/chan_utils.rs b/src/ln/chan_utils.rs index eb85c0e1..eab80a54 100644 --- a/src/ln/chan_utils.rs +++ b/src/ln/chan_utils.rs @@ -1,15 +1,21 @@ use bitcoin::blockdata::script::{Script,Builder}; use bitcoin::blockdata::opcodes; -use bitcoin::util::hash::Hash160; +use bitcoin::blockdata::transaction::{TxIn,TxOut,OutPoint,Transaction}; + +use bitcoin_hashes::{Hash, HashEngine}; +use bitcoin_hashes::sha256::Hash as Sha256; +use bitcoin_hashes::ripemd160::Hash as Ripemd160; +use bitcoin_hashes::hash160::Hash as Hash160; +use bitcoin_hashes::sha256d::Hash as Sha256dHash; + +use ln::channelmanager::PaymentHash; use secp256k1::key::{PublicKey,SecretKey}; use secp256k1::Secp256k1; use secp256k1; -use crypto::digest::Digest; -use crypto::ripemd160::Ripemd160; - -use util::sha2::Sha256; +pub const HTLC_SUCCESS_TX_WEIGHT: u64 = 703; +pub const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663; // Various functions for key derivation and transaction creation for use within channels. Primarily // used in Channel and ChannelMonitor. @@ -20,94 +26,82 @@ pub fn build_commitment_secret(commitment_seed: [u8; 32], idx: u64) -> [u8; 32] let bitpos = 47 - i; if idx & (1 << bitpos) == (1 << bitpos) { res[bitpos / 8] ^= 1 << (bitpos & 7); - let mut sha = Sha256::new(); - sha.input(&res); - sha.result(&mut res); + res = Sha256::hash(&res).into_inner(); } } res } -pub fn derive_private_key(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, base_secret: &SecretKey) -> Result { - let mut sha = Sha256::new(); +pub fn derive_private_key(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, base_secret: &SecretKey) -> Result { + let mut sha = Sha256::engine(); sha.input(&per_commitment_point.serialize()); - sha.input(&PublicKey::from_secret_key(&secp_ctx, &base_secret).unwrap().serialize()); - let mut res = [0; 32]; - sha.result(&mut res); + sha.input(&PublicKey::from_secret_key(&secp_ctx, &base_secret).serialize()); + let res = Sha256::from_engine(sha).into_inner(); let mut key = base_secret.clone(); - key.add_assign(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &res)?)?; + key.add_assign(&res)?; Ok(key) } -pub fn derive_public_key(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, base_point: &PublicKey) -> Result { - let mut sha = Sha256::new(); +pub fn derive_public_key(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, base_point: &PublicKey) -> Result { + let mut sha = Sha256::engine(); sha.input(&per_commitment_point.serialize()); sha.input(&base_point.serialize()); - let mut res = [0; 32]; - sha.result(&mut res); + let res = Sha256::from_engine(sha).into_inner(); - let hashkey = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &res)?).unwrap(); - base_point.combine(&secp_ctx, &hashkey) + let hashkey = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&res)?); + base_point.combine(&hashkey) } /// Derives a revocation key from its constituent parts -pub fn derive_private_revocation_key(secp_ctx: &Secp256k1, per_commitment_secret: &SecretKey, revocation_base_secret: &SecretKey) -> Result { - let revocation_base_point = PublicKey::from_secret_key(&secp_ctx, &revocation_base_secret).unwrap(); - let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret).unwrap(); +pub fn derive_private_revocation_key(secp_ctx: &Secp256k1, per_commitment_secret: &SecretKey, revocation_base_secret: &SecretKey) -> Result { + let revocation_base_point = PublicKey::from_secret_key(&secp_ctx, &revocation_base_secret); + let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret); let rev_append_commit_hash_key = { - let mut sha = Sha256::new(); + let mut sha = Sha256::engine(); sha.input(&revocation_base_point.serialize()); sha.input(&per_commitment_point.serialize()); - let mut res = [0; 32]; - sha.result(&mut res); - SecretKey::from_slice(&secp_ctx, &res)? + Sha256::from_engine(sha).into_inner() }; let commit_append_rev_hash_key = { - let mut sha = Sha256::new(); + let mut sha = Sha256::engine(); sha.input(&per_commitment_point.serialize()); sha.input(&revocation_base_point.serialize()); - let mut res = [0; 32]; - sha.result(&mut res); - SecretKey::from_slice(&secp_ctx, &res)? + Sha256::from_engine(sha).into_inner() }; let mut part_a = revocation_base_secret.clone(); - part_a.mul_assign(&secp_ctx, &rev_append_commit_hash_key)?; + part_a.mul_assign(&rev_append_commit_hash_key)?; let mut part_b = per_commitment_secret.clone(); - part_b.mul_assign(&secp_ctx, &commit_append_rev_hash_key)?; - part_a.add_assign(&secp_ctx, &part_b)?; + part_b.mul_assign(&commit_append_rev_hash_key)?; + part_a.add_assign(&part_b[..])?; Ok(part_a) } -pub fn derive_public_revocation_key(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, revocation_base_point: &PublicKey) -> Result { +pub fn derive_public_revocation_key(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, revocation_base_point: &PublicKey) -> Result { let rev_append_commit_hash_key = { - let mut sha = Sha256::new(); + let mut sha = Sha256::engine(); sha.input(&revocation_base_point.serialize()); sha.input(&per_commitment_point.serialize()); - let mut res = [0; 32]; - sha.result(&mut res); - SecretKey::from_slice(&secp_ctx, &res)? + Sha256::from_engine(sha).into_inner() }; let commit_append_rev_hash_key = { - let mut sha = Sha256::new(); + let mut sha = Sha256::engine(); sha.input(&per_commitment_point.serialize()); sha.input(&revocation_base_point.serialize()); - let mut res = [0; 32]; - sha.result(&mut res); - SecretKey::from_slice(&secp_ctx, &res)? + Sha256::from_engine(sha).into_inner() }; let mut part_a = revocation_base_point.clone(); part_a.mul_assign(&secp_ctx, &rev_append_commit_hash_key)?; let mut part_b = per_commitment_point.clone(); part_b.mul_assign(&secp_ctx, &commit_append_rev_hash_key)?; - part_a.combine(&secp_ctx, &part_b) + part_a.combine(&part_b) } pub struct TxCreationKeys { @@ -120,7 +114,7 @@ pub struct TxCreationKeys { } impl TxCreationKeys { - pub fn new(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, a_delayed_payment_base: &PublicKey, a_htlc_base: &PublicKey, b_revocation_base: &PublicKey, b_payment_base: &PublicKey, b_htlc_base: &PublicKey) -> Result { + pub fn new(secp_ctx: &Secp256k1, per_commitment_point: &PublicKey, a_delayed_payment_base: &PublicKey, a_htlc_base: &PublicKey, b_revocation_base: &PublicKey, b_payment_base: &PublicKey, b_htlc_base: &PublicKey) -> Result { Ok(TxCreationKeys { per_commitment_point: per_commitment_point.clone(), revocation_key: derive_public_revocation_key(&secp_ctx, &per_commitment_point, &b_revocation_base)?, @@ -135,94 +129,88 @@ impl TxCreationKeys { /// Gets the "to_local" output redeemscript, ie the script which is time-locked or spendable by /// the revocation key pub fn get_revokeable_redeemscript(revocation_key: &PublicKey, to_self_delay: u16, delayed_payment_key: &PublicKey) -> Script { - Builder::new().push_opcode(opcodes::All::OP_IF) - .push_slice(&revocation_key.serialize()) - .push_opcode(opcodes::All::OP_ELSE) - .push_int(to_self_delay as i64) - .push_opcode(opcodes::OP_CSV) - .push_opcode(opcodes::All::OP_DROP) - .push_slice(&delayed_payment_key.serialize()) - .push_opcode(opcodes::All::OP_ENDIF) - .push_opcode(opcodes::All::OP_CHECKSIG) - .into_script() + Builder::new().push_opcode(opcodes::all::OP_IF) + .push_slice(&revocation_key.serialize()) + .push_opcode(opcodes::all::OP_ELSE) + .push_int(to_self_delay as i64) + .push_opcode(opcodes::OP_CSV) + .push_opcode(opcodes::all::OP_DROP) + .push_slice(&delayed_payment_key.serialize()) + .push_opcode(opcodes::all::OP_ENDIF) + .push_opcode(opcodes::all::OP_CHECKSIG) + .into_script() } -#[derive(Clone)] +#[derive(Clone, PartialEq)] pub struct HTLCOutputInCommitment { pub offered: bool, pub amount_msat: u64, pub cltv_expiry: u32, - pub payment_hash: [u8; 32], - pub transaction_output_index: u32, + pub payment_hash: PaymentHash, + pub transaction_output_index: Option, } #[inline] -pub fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, a_htlc_key: &PublicKey, b_htlc_key: &PublicKey, revocation_key: &PublicKey, offered: bool) -> Script { - let payment_hash160 = { - let mut ripemd = Ripemd160::new(); - ripemd.input(&htlc.payment_hash); - let mut res = [0; 20]; - ripemd.result(&mut res); - res - }; - if offered { - Builder::new().push_opcode(opcodes::All::OP_DUP) - .push_opcode(opcodes::All::OP_HASH160) - .push_slice(&Hash160::from_data(&revocation_key.serialize())[..]) - .push_opcode(opcodes::All::OP_EQUAL) - .push_opcode(opcodes::All::OP_IF) - .push_opcode(opcodes::All::OP_CHECKSIG) - .push_opcode(opcodes::All::OP_ELSE) +pub fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, a_htlc_key: &PublicKey, b_htlc_key: &PublicKey, revocation_key: &PublicKey) -> Script { + let payment_hash160 = Ripemd160::hash(&htlc.payment_hash.0[..]).into_inner(); + if htlc.offered { + Builder::new().push_opcode(opcodes::all::OP_DUP) + .push_opcode(opcodes::all::OP_HASH160) + .push_slice(&Hash160::hash(&revocation_key.serialize())[..]) + .push_opcode(opcodes::all::OP_EQUAL) + .push_opcode(opcodes::all::OP_IF) + .push_opcode(opcodes::all::OP_CHECKSIG) + .push_opcode(opcodes::all::OP_ELSE) .push_slice(&b_htlc_key.serialize()[..]) - .push_opcode(opcodes::All::OP_SWAP) - .push_opcode(opcodes::All::OP_SIZE) + .push_opcode(opcodes::all::OP_SWAP) + .push_opcode(opcodes::all::OP_SIZE) .push_int(32) - .push_opcode(opcodes::All::OP_EQUAL) - .push_opcode(opcodes::All::OP_NOTIF) - .push_opcode(opcodes::All::OP_DROP) + .push_opcode(opcodes::all::OP_EQUAL) + .push_opcode(opcodes::all::OP_NOTIF) + .push_opcode(opcodes::all::OP_DROP) .push_int(2) - .push_opcode(opcodes::All::OP_SWAP) + .push_opcode(opcodes::all::OP_SWAP) .push_slice(&a_htlc_key.serialize()[..]) .push_int(2) - .push_opcode(opcodes::All::OP_CHECKMULTISIG) - .push_opcode(opcodes::All::OP_ELSE) - .push_opcode(opcodes::All::OP_HASH160) + .push_opcode(opcodes::all::OP_CHECKMULTISIG) + .push_opcode(opcodes::all::OP_ELSE) + .push_opcode(opcodes::all::OP_HASH160) .push_slice(&payment_hash160) - .push_opcode(opcodes::All::OP_EQUALVERIFY) - .push_opcode(opcodes::All::OP_CHECKSIG) - .push_opcode(opcodes::All::OP_ENDIF) - .push_opcode(opcodes::All::OP_ENDIF) + .push_opcode(opcodes::all::OP_EQUALVERIFY) + .push_opcode(opcodes::all::OP_CHECKSIG) + .push_opcode(opcodes::all::OP_ENDIF) + .push_opcode(opcodes::all::OP_ENDIF) .into_script() } else { - Builder::new().push_opcode(opcodes::All::OP_DUP) - .push_opcode(opcodes::All::OP_HASH160) - .push_slice(&Hash160::from_data(&revocation_key.serialize())[..]) - .push_opcode(opcodes::All::OP_EQUAL) - .push_opcode(opcodes::All::OP_IF) - .push_opcode(opcodes::All::OP_CHECKSIG) - .push_opcode(opcodes::All::OP_ELSE) + Builder::new().push_opcode(opcodes::all::OP_DUP) + .push_opcode(opcodes::all::OP_HASH160) + .push_slice(&Hash160::hash(&revocation_key.serialize())[..]) + .push_opcode(opcodes::all::OP_EQUAL) + .push_opcode(opcodes::all::OP_IF) + .push_opcode(opcodes::all::OP_CHECKSIG) + .push_opcode(opcodes::all::OP_ELSE) .push_slice(&b_htlc_key.serialize()[..]) - .push_opcode(opcodes::All::OP_SWAP) - .push_opcode(opcodes::All::OP_SIZE) + .push_opcode(opcodes::all::OP_SWAP) + .push_opcode(opcodes::all::OP_SIZE) .push_int(32) - .push_opcode(opcodes::All::OP_EQUAL) - .push_opcode(opcodes::All::OP_IF) - .push_opcode(opcodes::All::OP_HASH160) + .push_opcode(opcodes::all::OP_EQUAL) + .push_opcode(opcodes::all::OP_IF) + .push_opcode(opcodes::all::OP_HASH160) .push_slice(&payment_hash160) - .push_opcode(opcodes::All::OP_EQUALVERIFY) + .push_opcode(opcodes::all::OP_EQUALVERIFY) .push_int(2) - .push_opcode(opcodes::All::OP_SWAP) + .push_opcode(opcodes::all::OP_SWAP) .push_slice(&a_htlc_key.serialize()[..]) .push_int(2) - .push_opcode(opcodes::All::OP_CHECKMULTISIG) - .push_opcode(opcodes::All::OP_ELSE) - .push_opcode(opcodes::All::OP_DROP) + .push_opcode(opcodes::all::OP_CHECKMULTISIG) + .push_opcode(opcodes::all::OP_ELSE) + .push_opcode(opcodes::all::OP_DROP) .push_int(htlc.cltv_expiry as i64) .push_opcode(opcodes::OP_CLTV) - .push_opcode(opcodes::All::OP_DROP) - .push_opcode(opcodes::All::OP_CHECKSIG) - .push_opcode(opcodes::All::OP_ENDIF) - .push_opcode(opcodes::All::OP_ENDIF) + .push_opcode(opcodes::all::OP_DROP) + .push_opcode(opcodes::all::OP_CHECKSIG) + .push_opcode(opcodes::all::OP_ENDIF) + .push_opcode(opcodes::all::OP_ENDIF) .into_script() } } @@ -230,6 +218,39 @@ pub fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, a /// note here that 'a_revocation_key' is generated using b_revocation_basepoint and a's /// commitment secret. 'htlc' does *not* need to have its previous_output_index filled. #[inline] -pub fn get_htlc_redeemscript(htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys, offered: bool) -> Script { - get_htlc_redeemscript_with_explicit_keys(htlc, &keys.a_htlc_key, &keys.b_htlc_key, &keys.revocation_key, offered) +pub fn get_htlc_redeemscript(htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Script { + get_htlc_redeemscript_with_explicit_keys(htlc, &keys.a_htlc_key, &keys.b_htlc_key, &keys.revocation_key) +} + +/// panics if htlc.transaction_output_index.is_none()! +pub fn build_htlc_transaction(prev_hash: &Sha256dHash, feerate_per_kw: u64, to_self_delay: u16, htlc: &HTLCOutputInCommitment, a_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction { + let mut txins: Vec = Vec::new(); + txins.push(TxIn { + previous_output: OutPoint { + txid: prev_hash.clone(), + vout: htlc.transaction_output_index.expect("Can't build an HTLC transaction for a dust output"), + }, + script_sig: Script::new(), + sequence: 0, + witness: Vec::new(), + }); + + let total_fee = if htlc.offered { + feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000 + } else { + feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000 + }; + + let mut txouts: Vec = Vec::new(); + txouts.push(TxOut { + script_pubkey: get_revokeable_redeemscript(revocation_key, to_self_delay, a_delayed_payment_key).to_v0_p2wsh(), + value: htlc.amount_msat / 1000 - total_fee //TODO: BOLT 3 does not specify if we should add amount_msat before dividing or if we should divide by 1000 before subtracting (as we do here) + }); + + Transaction { + version: 2, + lock_time: if htlc.offered { htlc.cltv_expiry } else { 0 }, + input: txins, + output: txouts, + } }