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Ensure the size of our locking script never changes

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Thomas Eizinger 2021-08-12 11:28:00 +10:00
parent 4405dbcf9c
commit 148fdb8d0a
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4 changed files with 35 additions and 8 deletions
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22
swap/src/bitcoin/lock.rs
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@ -7,11 +7,11 @@ use ::bitcoin::{OutPoint, TxIn, TxOut, Txid};
use anyhow::{bail, Result};
use bdk::database::BatchDatabase;
use bitcoin::Script;
use ecdsa_fun::fun::Point;
use miniscript::{Descriptor, DescriptorTrait};
use rand::thread_rng;
use serde::{Deserialize, Serialize};
const SCRIPT_SIZE: usize = 34;
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct TxLock {
inner: PartiallySignedTransaction,
@ -112,12 +112,7 @@ impl TxLock {
/// Calculate the size of the script used by this transaction.
pub fn script_size() -> usize {
build_shared_output_descriptor(
Point::random(&mut thread_rng()),
Point::random(&mut thread_rng()),
)
.script_pubkey()
.len()
SCRIPT_SIZE
}
pub fn script_pubkey(&self) -> Script {
@ -245,6 +240,17 @@ mod tests {
result.expect_err("PSBT to be invalid");
}
proptest::proptest! {
#[test]
fn estimated_tx_lock_script_size_never_changes(a in crate::proptest::ecdsa_fun::point(), b in crate::proptest::ecdsa_fun::point()) {
proptest::prop_assume!(a != b);
let computed_size = build_shared_output_descriptor(a, b).script_pubkey().len();
assert_eq!(computed_size, SCRIPT_SIZE);
}
}
/// Helper function that represents Bob's action of constructing the PSBT.
///
/// Extracting this allows us to keep the tests concise.