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3.10 Remove use of Network::Bitcoin

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All uses were safe due to addresses being converted to script_pubkeys which
don't embed their network. The only risk of there being an issue is if a
future address spec did embed the net ID into the script_pubkey and that was
moved to.

This resolves the audit note and does offer that tightening.
This commit is contained in:
Luke Parker
2023-07-20 00:00:20 -04:00
parent 6f9d02fdf8
commit f66fe3c1cb
4 changed files with 28 additions and 22 deletions
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14
coins/bitcoin/src/wallet/mod.rs
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@@ -15,7 +15,8 @@ use frost::{
use bitcoin::{
consensus::encode::{Decodable, serialize},
key::TweakedPublicKey,
OutPoint, ScriptBuf, TxOut, Transaction, Block, Network, Address,
address::Payload,
OutPoint, ScriptBuf, TxOut, Transaction, Block,
};
use crate::crypto::{x_only, make_even};
@@ -32,15 +33,15 @@ pub fn tweak_keys(keys: &ThresholdKeys<Secp256k1>) -> ThresholdKeys<Secp256k1> {
keys.offset(Scalar::from(offset))
}
/// Return the Taproot address for a public key.
/// Return the Taproot address payload for a public key.
///
/// If the key is odd, this will return None.
pub fn address(network: Network, key: ProjectivePoint) -> Option<Address> {
pub fn address_payload(key: ProjectivePoint) -> Option<Payload> {
if key.to_encoded_point(true).tag() != Tag::CompressedEvenY {
return None;
}
Some(Address::p2tr_tweaked(TweakedPublicKey::dangerous_assume_tweaked(x_only(&key)), network))
Some(Payload::p2tr_tweaked(TweakedPublicKey::dangerous_assume_tweaked(x_only(&key))))
}
/// A spendable output.
@@ -109,8 +110,7 @@ impl Scanner {
/// Returns None if this key can't be scanned for.
pub fn new(key: ProjectivePoint) -> Option<Scanner> {
let mut scripts = HashMap::new();
// Uses Network::Bitcoin since network is irrelevant here
scripts.insert(address(Network::Bitcoin, key)?.script_pubkey(), Scalar::ZERO);
scripts.insert(address_payload(key)?.script_pubkey(), Scalar::ZERO);
Some(Scanner { key, scripts })
}
@@ -127,7 +127,7 @@ impl Scanner {
// chance of being even
// That means this should terminate within a very small amount of iterations
loop {
match address(Network::Bitcoin, self.key + (ProjectivePoint::GENERATOR * offset)) {
match address_payload(self.key + (ProjectivePoint::GENERATOR * offset)) {
Some(address) => {
let script = address.script_pubkey();
if self.scripts.contains_key(&script) {