Add Trampoline error test vector

Author: arik-so

lightning/src/ln/onion_utils.rs

@@ -2039,11 +2039,11 @@ mod tests {
 	use crate::prelude::*;
 	use crate::util::test_utils::TestLogger;
 
+	use super::*;
 	use bitcoin::hex::FromHex;
 	use bitcoin::secp256k1::Secp256k1;
 	use bitcoin::secp256k1::{PublicKey, SecretKey};
-
-	use super::*;
+	use types::features::Features;
 
 	fn get_test_session_key() -> SecretKey {
 		let hex = "4141414141414141414141414141414141414141414141414141414141414141";
@@ -2404,6 +2404,95 @@ mod tests {
 		assert_eq!(decrypted_failure.onion_error_code, Some(0x2002));
 	}
 
+	#[test]
+	fn test_trampoline_onion_error_vectors() {
+		// as per https://github.com/lightning/bolts/blob/079f761bf68caa48544bd6bf0a29591d43425b0b/bolt04/trampoline-onion-error-test.json
+		// TODO(arik): check intermediate hops' perspectives once we have implemented forwarding
+
+		let dummy_amt_msat = 150_000_000;
+		let path = Path {
+			hops: vec![
+				// Bob
+				RouteHop {
+					pubkey: PublicKey::from_slice(&<Vec<u8>>::from_hex("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()).unwrap(),
+					node_features: NodeFeatures::empty(),
+					short_channel_id: 0,
+					channel_features: ChannelFeatures::empty(),
+					fee_msat: 3_000,
+					cltv_expiry_delta: 24,
+					maybe_announced_channel: false,
+				},
+
+				// Carol
+				RouteHop {
+					pubkey: PublicKey::from_slice(&<Vec<u8>>::from_hex("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()).unwrap(),
+					node_features: NodeFeatures::empty(),
+					short_channel_id: (572330 << 40) + (42 << 16) + 2821,
+					channel_features: ChannelFeatures::empty(),
+					fee_msat: 153_000,
+					cltv_expiry_delta: 0,
+					maybe_announced_channel: false,
+				},
+			],
+			blinded_tail: Some(BlindedTail {
+				trampoline_hops: vec![
+					// Carol's pubkey
+					TrampolineHop {
+						pubkey: PublicKey::from_slice(&<Vec<u8>>::from_hex("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()).unwrap(),
+						node_features: Features::empty(),
+						fee_msat: 2_500,
+						cltv_expiry_delta: 24,
+					},
+
+					// Eve's pubkey
+					TrampolineHop {
+						pubkey: PublicKey::from_slice(&<Vec<u8>>::from_hex("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()).unwrap(),
+						node_features: Features::empty(),
+						fee_msat: 2_500,
+						cltv_expiry_delta: 24,
+					},
+				],
+
+				// Dummy blinded hop (because LDK doesn't allow unblinded Trampoline receives)
+				hops: vec![
+					// Eve's dummy blinded node id
+					BlindedHop {
+						blinded_node_id: PublicKey::from_slice(&<Vec<u8>>::from_hex("0295d40514096a8be54859e7dfe947b376eaafea8afe5cb4eb2c13ff857ed0b4be").unwrap()).unwrap(),
+						encrypted_payload: vec![],
+					}
+				],
+				blinding_point: PublicKey::from_slice(&<Vec<u8>>::from_hex("02988face71e92c345a068f740191fd8e53be14f0bb957ef730d3c5f76087b960e").unwrap()).unwrap(),
+				excess_final_cltv_expiry_delta: 0,
+				final_value_msat: dummy_amt_msat
+			}),
+		};
+
+		// all dummy values
+		let secp_ctx = Secp256k1::new();
+		let trampoline_session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
+		let outer_session_priv = SecretKey::from_slice(&[4; 32]).unwrap();
+
+		let logger: Arc<TestLogger> = Arc::new(TestLogger::new());
+		let htlc_source = HTLCSource::OutboundRoute {
+			path,
+			session_priv: trampoline_session_priv,
+			first_hop_htlc_msat: dummy_amt_msat,
+			payment_id: PaymentId([1; 32]),
+		};
+
+		let error_packet_hex = "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";
+		let error_packet =
+			OnionErrorPacket { data: <Vec<u8>>::from_hex(error_packet_hex).unwrap() };
+		let decrypted_failure = process_onion_failure(
+			&secp_ctx,
+			&logger,
+			&htlc_source,
+			error_packet,
+			Some(outer_session_priv),
+		);
+		assert_eq!(decrypted_failure.onion_error_code, Some(0x400f));
+	}
+
 	#[test]
 	fn test_non_attributable_failure_packet_onion() {
 		// Create a failure packet with bogus data.