Git-Mirrors/xmr-btc-swap
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Delete leftover xmr_btc crate

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This commit is contained in:
rishflab 2021-01-08 10:55:15 +11:00
parent dcea54dbf1
commit a3e896684c
4 changed files with 0 additions and 334 deletions
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285
xmr-btc/src/bitcoin.rs
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mod timelocks;
pub mod transactions;
use crate::{config::Config, ExpiredTimelocks};
use anyhow::{anyhow, bail, Result};
use async_trait::async_trait;
use bitcoin::hashes::{hex::ToHex, Hash};
use ecdsa_fun::{adaptor::Adaptor, fun::Point, nonce::Deterministic, ECDSA};
use miniscript::{Descriptor, Segwitv0};
use rand::{CryptoRng, RngCore};
use serde::{Deserialize, Serialize};
use sha2::Sha256;
use std::str::FromStr;
pub use bitcoin::{util::psbt::PartiallySignedTransaction, *};
pub use ecdsa_fun::{adaptor::EncryptedSignature, fun::Scalar, Signature};
pub use timelocks::*;
pub use transactions::{TxCancel, TxLock, TxPunish, TxRedeem, TxRefund};
// TODO: Configurable tx-fee (note: parties have to agree prior to swapping)
// Current reasoning:
// tx with largest weight (as determined by get_weight() upon broadcast in e2e
// test) = 609 assuming segwit and 60 sat/vB:
// (609 / 4) * 60 (sat/vB) = 9135 sats
// Recommended: Overpay a bit to ensure we don't have to wait too long for test
// runs.
pub const TX_FEE: u64 = 15_000;
#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct SecretKey {
inner: Scalar,
public: Point,
}
impl SecretKey {
pub fn new_random<R: RngCore + CryptoRng>(rng: &mut R) -> Self {
let scalar = Scalar::random(rng);
let ecdsa = ECDSA::<()>::default();
let public = ecdsa.verification_key_for(&scalar);
Self {
inner: scalar,
public,
}
}
pub fn public(&self) -> PublicKey {
PublicKey(self.public)
}
pub fn to_bytes(&self) -> [u8; 32] {
self.inner.to_bytes()
}
pub fn sign(&self, digest: SigHash) -> Signature {
let ecdsa = ECDSA::<Deterministic<Sha256>>::default();
ecdsa.sign(&self.inner, &digest.into_inner())
}
// TxRefund encsigning explanation:
//
// A and B, are the Bitcoin Public Keys which go on the joint output for
// TxLock_Bitcoin. S_a and S_b, are the Monero Public Keys which go on the
// joint output for TxLock_Monero
// tx_refund: multisig(A, B), published by bob
// bob can produce sig on B for tx_refund using b
// alice sends over an encrypted signature on A for tx_refund using a encrypted
// with S_b we want to leak s_b
// produced (by Alice) encsig - published (by Bob) sig = s_b (it's not really
// subtraction, it's recover)
// self = a, Y = S_b, digest = tx_refund
pub fn encsign(&self, Y: PublicKey, digest: SigHash) -> EncryptedSignature {
let adaptor = Adaptor::<Sha256, Deterministic<Sha256>>::default();
adaptor.encrypted_sign(&self.inner, &Y.0, &digest.into_inner())
}
}
#[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq)]
pub struct PublicKey(Point);
impl From<PublicKey> for Point {
fn from(from: PublicKey) -> Self {
from.0
}
}
impl From<Scalar> for SecretKey {
fn from(scalar: Scalar) -> Self {
let ecdsa = ECDSA::<()>::default();
let public = ecdsa.verification_key_for(&scalar);
Self {
inner: scalar,
public,
}
}
}
impl From<SecretKey> for Scalar {
fn from(sk: SecretKey) -> Self {
sk.inner
}
}
impl From<Scalar> for PublicKey {
fn from(scalar: Scalar) -> Self {
let ecdsa = ECDSA::<()>::default();
PublicKey(ecdsa.verification_key_for(&scalar))
}
}
pub fn verify_sig(
verification_key: &PublicKey,
transaction_sighash: &SigHash,
sig: &Signature,
) -> Result<()> {
let ecdsa = ECDSA::verify_only();
if ecdsa.verify(&verification_key.0, &transaction_sighash.into_inner(), &sig) {
Ok(())
} else {
bail!(InvalidSignature)
}
}
#[derive(Debug, Clone, Copy, thiserror::Error)]
#[error("signature is invalid")]
pub struct InvalidSignature;
pub fn verify_encsig(
verification_key: PublicKey,
encryption_key: PublicKey,
digest: &SigHash,
encsig: &EncryptedSignature,
) -> Result<()> {
let adaptor = Adaptor::<Sha256, Deterministic<Sha256>>::default();
if adaptor.verify_encrypted_signature(
&verification_key.0,
&encryption_key.0,
&digest.into_inner(),
&encsig,
) {
Ok(())
} else {
bail!(InvalidEncryptedSignature)
}
}
#[derive(Clone, Copy, Debug, thiserror::Error)]
#[error("encrypted signature is invalid")]
pub struct InvalidEncryptedSignature;
pub fn build_shared_output_descriptor(A: Point, B: Point) -> Descriptor<bitcoin::PublicKey> {
const MINISCRIPT_TEMPLATE: &str = "c:and_v(v:pk(A),pk_k(B))";
// NOTE: This shouldn't be a source of error, but maybe it is
let A = ToHex::to_hex(&secp256k1::PublicKey::from(A));
let B = ToHex::to_hex(&secp256k1::PublicKey::from(B));
let miniscript = MINISCRIPT_TEMPLATE.replace("A", &A).replace("B", &B);
let miniscript = miniscript::Miniscript::<bitcoin::PublicKey, Segwitv0>::from_str(&miniscript)
.expect("a valid miniscript");
Descriptor::Wsh(miniscript)
}
#[async_trait]
pub trait BuildTxLockPsbt {
async fn build_tx_lock_psbt(
&self,
output_address: Address,
output_amount: Amount,
) -> Result<PartiallySignedTransaction>;
}
#[async_trait]
pub trait SignTxLock {
async fn sign_tx_lock(&self, tx_lock: TxLock) -> Result<Transaction>;
}
#[async_trait]
pub trait BroadcastSignedTransaction {
async fn broadcast_signed_transaction(&self, transaction: Transaction) -> Result<Txid>;
}
#[async_trait]
pub trait WatchForRawTransaction {
async fn watch_for_raw_transaction(&self, txid: Txid) -> Transaction;
}
#[async_trait]
pub trait WaitForTransactionFinality {
async fn wait_for_transaction_finality(&self, txid: Txid, config: Config) -> Result<()>;
}
#[async_trait]
pub trait GetBlockHeight {
async fn get_block_height(&self) -> BlockHeight;
}
#[async_trait]
pub trait TransactionBlockHeight {
async fn transaction_block_height(&self, txid: Txid) -> BlockHeight;
}
#[async_trait]
pub trait WaitForBlockHeight {
async fn wait_for_block_height(&self, height: BlockHeight);
}
#[async_trait]
pub trait GetRawTransaction {
async fn get_raw_transaction(&self, txid: Txid) -> Result<Transaction>;
}
#[async_trait]
pub trait Network {
fn get_network(&self) -> bitcoin::Network;
}
pub fn recover(S: PublicKey, sig: Signature, encsig: EncryptedSignature) -> Result<SecretKey> {
let adaptor = Adaptor::<Sha256, Deterministic<Sha256>>::default();
let s = adaptor
.recover_decryption_key(&S.0, &sig, &encsig)
.map(SecretKey::from)
.ok_or_else(|| anyhow!("secret recovery failure"))?;
Ok(s)
}
pub async fn poll_until_block_height_is_gte<B>(client: &B, target: BlockHeight)
where
B: GetBlockHeight,
{
while client.get_block_height().await < target {
tokio::time::delay_for(std::time::Duration::from_secs(1)).await;
}
}
pub async fn current_epoch<W>(
bitcoin_wallet: &W,
cancel_timelock: Timelock,
punish_timelock: Timelock,
lock_tx_id: ::bitcoin::Txid,
) -> anyhow::Result<ExpiredTimelocks>
where
W: WatchForRawTransaction + TransactionBlockHeight + GetBlockHeight,
{
let current_block_height = bitcoin_wallet.get_block_height().await;
let lock_tx_height = bitcoin_wallet.transaction_block_height(lock_tx_id).await;
let cancel_timelock_height = lock_tx_height + cancel_timelock;
let punish_timelock_height = cancel_timelock_height + punish_timelock;
match (
current_block_height < cancel_timelock_height,
current_block_height < punish_timelock_height,
) {
(true, _) => Ok(ExpiredTimelocks::None),
(false, true) => Ok(ExpiredTimelocks::Cancel),
(false, false) => Ok(ExpiredTimelocks::Punish),
}
}
pub async fn wait_for_cancel_timelock_to_expire<W>(
bitcoin_wallet: &W,
cancel_timelock: Timelock,
lock_tx_id: ::bitcoin::Txid,
) -> Result<()>
where
W: WatchForRawTransaction + TransactionBlockHeight + GetBlockHeight,
{
let tx_lock_height = bitcoin_wallet.transaction_block_height(lock_tx_id).await;
poll_until_block_height_is_gte(bitcoin_wallet, tx_lock_height + cancel_timelock).await;
Ok(())
}

49
xmr-btc/src/bitcoin/timelocks.rs
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use serde::{Deserialize, Serialize};
use std::ops::Add;
/// Represent a timelock, expressed in relative block height as defined in
/// [BIP68](https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki).
/// E.g. The timelock expires 10 blocks after the reference transaction is
/// mined.
#[derive(Debug, Copy, Clone, Serialize, Deserialize, Eq, PartialEq)]
#[serde(transparent)]
pub struct Timelock(u32);
impl Timelock {
pub const fn new(number_of_blocks: u32) -> Self {
Self(number_of_blocks)
}
}
impl From<Timelock> for u32 {
fn from(timelock: Timelock) -> Self {
timelock.0
}
}
/// Represent a block height, or block number, expressed in absolute block
/// count. E.g. The transaction was included in block #655123, 655123 block
/// after the genesis block.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Serialize, Deserialize)]
#[serde(transparent)]
pub struct BlockHeight(u32);
impl From<BlockHeight> for u32 {
fn from(height: BlockHeight) -> Self {
height.0
}
}
impl BlockHeight {
pub const fn new(block_height: u32) -> Self {
Self(block_height)
}
}
impl Add<Timelock> for BlockHeight {
type Output = BlockHeight;
fn add(self, rhs: Timelock) -> Self::Output {
BlockHeight(self.0 + rhs.0)
}
}

0
xmr-btc/src/lib.rs
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0
xmr-btc/src/monero.rs
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