bark/vtxo/
signing.rs

1
2use bitcoin::{TapSighash, Witness, taproot};
3use bitcoin::key::Keypair;
4
5use ark::vtxo::{TapScriptClause, VtxoClause};
6use ark::vtxo::policy::signing::VtxoSigner;
7
8use crate::{SECP, Wallet};
9
10impl Wallet {
11	pub (crate) async fn clause_keypair(&self, clause: &VtxoClause) -> Option<Keypair> {
12		let clause_pubkey = clause.pubkey();
13		self.pubkey_keypair(&clause_pubkey).await.ok()
14			.flatten().map(|(_, keypair)| keypair)
15	}
16}
17
18#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
19#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
20impl VtxoSigner for Wallet {
21	async fn witness(
22		&self,
23		clause: &VtxoClause,
24		control_block: &taproot::ControlBlock,
25		sighash: TapSighash,
26	) -> Option<Witness> {
27		let signature = match self.clause_keypair(clause).await {
28			Some(keypair) => {
29				SECP.sign_schnorr_with_aux_rand(&sighash.into(), &keypair, &rand::random())
30			},
31			None => return None,
32		};
33
34		match clause {
35			VtxoClause::DelayedSign(c) => Some(c.witness(&signature, control_block)),
36			VtxoClause::DelayedTimelockSign(c) => Some(c.witness(&signature, &control_block)),
37			VtxoClause::TimelockSign(c) => Some(c.witness(&signature, &control_block)),
38			VtxoClause::HashDelaySign(c) => {
39				let receive = self.db.fetch_lightning_receive_by_payment_hash(c.hash.into())
40					.await.ok().flatten();
41
42				receive.map(|r| c.witness(
43					&(signature, r.payment_preimage.to_byte_array()), &control_block,
44				))
45			},
46			VtxoClause::HashSign(_) => None, // Not used by bark
47		}
48	}
49}
bark/vtxo/signing.rs

bark/vtxo/
signing.rs
