f - build and serialize response

Author: jkczyz

fuzz/src/refund_deser.rs

@@ -7,19 +7,92 @@
 // You may not use this file except in accordance with one or both of these
 // licenses.
 
+use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, SecretKey, self};
 use crate::utils::test_logger;
+use core::convert::Infallible;
+use lightning::chain::keysinterface::EntropySource;
+use lightning::ln::PaymentHash;
+use lightning::ln::features::BlindedHopFeatures;
+use lightning::offers::invoice::{BlindedPayInfo, UnsignedInvoice};
+use lightning::offers::parse::SemanticError;
 use lightning::offers::refund::Refund;
+use lightning::onion_message::BlindedPath;
+use lightning::util::ser::Writeable;
 
 #[inline]
 pub fn do_test<Out: test_logger::Output>(data: &[u8], _out: Out) {
 	if let Ok(bech32_encoded) = std::str::from_utf8(data) {
 		if let Ok(refund) = bech32_encoded.parse::<Refund>() {
 			let bech32_encoded = refund.to_string();
 			assert_eq!(refund, bech32_encoded.parse::<Refund>().unwrap());
+
+			let secp_ctx = Secp256k1::new();
+			let keys =
+				KeyPair::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
+			let pubkey = PublicKey::from(keys);
+			let mut buffer = Vec::new();
+
+			if let Ok(invoice) = build_response(&refund, pubkey, &secp_ctx) {
+				invoice
+					.sign::<_, Infallible>(
+						|digest| Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &keys))
+					)
+					.unwrap()
+					.write(&mut buffer)
+					.unwrap();
+			}
 		}
 	}
 }
 
+struct Randomness;
+
+impl EntropySource for Randomness {
+	fn get_secure_random_bytes(&self) -> [u8; 32] { [42; 32] }
+}
+
+fn pubkey(byte: u8) -> PublicKey {
+	let secp_ctx = Secp256k1::new();
+	PublicKey::from_secret_key(&secp_ctx, &privkey(byte))
+}
+
+fn privkey(byte: u8) -> SecretKey {
+	SecretKey::from_slice(&[byte; 32]).unwrap()
+}
+
+fn build_response<'a, T: secp256k1::Signing + secp256k1::Verification>(
+	refund: &'a Refund, signing_pubkey: PublicKey, secp_ctx: &Secp256k1<T>
+) -> Result<UnsignedInvoice<'a>, SemanticError> {
+	let entropy_source = Randomness {};
+	let paths = vec![
+		BlindedPath::new(&[pubkey(43), pubkey(44), pubkey(42)], &entropy_source, secp_ctx).unwrap(),
+		BlindedPath::new(&[pubkey(45), pubkey(46), pubkey(42)], &entropy_source, secp_ctx).unwrap(),
+	];
+
+	let payinfo = vec![
+		BlindedPayInfo {
+			fee_base_msat: 1,
+			fee_proportional_millionths: 1_000,
+			cltv_expiry_delta: 42,
+			htlc_minimum_msat: 100,
+			htlc_maximum_msat: 1_000_000_000_000,
+			features: BlindedHopFeatures::empty(),
+		},
+		BlindedPayInfo {
+			fee_base_msat: 1,
+			fee_proportional_millionths: 1_000,
+			cltv_expiry_delta: 42,
+			htlc_minimum_msat: 100,
+			htlc_maximum_msat: 1_000_000_000_000,
+			features: BlindedHopFeatures::empty(),
+		},
+	];
+
+	let payment_paths = paths.into_iter().zip(payinfo.into_iter()).collect();
+	let payment_hash = PaymentHash([42; 32]);
+	refund.respond_with(payment_paths, payment_hash, signing_pubkey)?.build()
+}
+
 pub fn refund_deser_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 	do_test(data, out);
 }