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joostjagerjoostjager
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Refactor onion_utils to encrypt/decrypt OnionErrorPacket types
Prepares for extending OnionErrorPacket with attribution data.
1 parent 3a5f428 commit 380bc2a

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2 files changed

+91
-87
lines changed

2 files changed

+91
-87
lines changed

‎lightning/src/ln/onion_route_tests.rs‎

Lines changed: 21 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -28,7 +28,7 @@ use crate::ln::msgs::{
2828
OutboundOnionPayload, OutboundTrampolinePayload, MessageSendEvent,
2929
};
3030
use crate::ln::wire::Encode;
31-
use crate::util::ser::{Writeable, Writer, BigSize};
31+
use crate::util::ser::{BigSize, Writeable, Writer};
3232
use crate::util::test_utils;
3333
use crate::util::config::{UserConfig, ChannelConfig, MaxDustHTLCExposure};
3434
use crate::util::errors::APIError;
@@ -49,6 +49,8 @@ use crate::blinded_path::BlindedHop;
4949
use crate::ln::functional_test_utils::*;
5050
use crate::ln::onion_utils::{construct_trampoline_onion_keys, construct_trampoline_onion_packet};
5151

52+
use super::msgs::OnionErrorPacket;
53+
5254
fn run_onion_failure_test<F1,F2>(_name: &str, test_case: u8, nodes: &Vec<Node>, route: &Route, payment_hash: &PaymentHash, payment_secret: &PaymentSecret, callback_msg: F1, callback_node: F2, expected_retryable: bool, expected_error_code: Option<u16>, expected_channel_update: Option<NetworkUpdate>, expected_short_channel_id: Option<u64>, expected_htlc_destination: Option<HTLCDestination>)
5355
where F1: for <'a> FnMut(&'a mut msgs::UpdateAddHTLC),
5456
F2: FnMut(),
@@ -670,8 +672,12 @@ fn test_onion_failure() {
670672
let mut hmac = HmacEngine::<Sha256>::new(&um);
671673
hmac.input(&decoded_err_packet.encode()[32..]);
672674
decoded_err_packet.hmac = Hmac::from_engine(hmac).to_byte_array();
673-
msg.reason = onion_utils::encrypt_failure_packet(
674-
&onion_keys[1].shared_secret.as_ref(), &decoded_err_packet.encode()[..])
675+
let mut onion_error = OnionErrorPacket{
676+
data: decoded_err_packet.encode(),
677+
};
678+
onion_utils::crypt_failure_packet(
679+
&onion_keys[1].shared_secret.as_ref(), &mut onion_error);
680+
msg.reason = onion_error;
675681
}, || nodes[2].node.fail_htlc_backwards(&payment_hash), false, None,
676682
Some(NetworkUpdate::NodeFailure { node_id: route.paths[0].hops[1].pubkey, is_permanent: true }),
677683
Some(channels[1].0.contents.short_channel_id), None);
@@ -693,8 +699,12 @@ fn test_onion_failure() {
693699
let mut hmac = HmacEngine::<Sha256>::new(&um);
694700
hmac.input(&decoded_err_packet.encode()[32..]);
695701
decoded_err_packet.hmac = Hmac::from_engine(hmac).to_byte_array();
696-
msg.reason = onion_utils::encrypt_failure_packet(
697-
&onion_keys[0].shared_secret.as_ref(), &decoded_err_packet.encode()[..])
702+
let mut onion_error = OnionErrorPacket{
703+
data: decoded_err_packet.encode(),
704+
};
705+
onion_utils::crypt_failure_packet(
706+
&onion_keys[0].shared_secret.as_ref(), &mut onion_error);
707+
msg.reason = onion_error;
698708
}, || {}, true, Some(0x1000|7),
699709
Some(NetworkUpdate::ChannelFailure {
700710
short_channel_id: channels[1].0.contents.short_channel_id,
@@ -717,8 +727,12 @@ fn test_onion_failure() {
717727
let mut hmac = HmacEngine::<Sha256>::new(&um);
718728
hmac.input(&decoded_err_packet.encode()[32..]);
719729
decoded_err_packet.hmac = Hmac::from_engine(hmac).to_byte_array();
720-
msg.reason = onion_utils::encrypt_failure_packet(
721-
&onion_keys[1].shared_secret.as_ref(), &decoded_err_packet.encode()[..])
730+
let mut onion_error = OnionErrorPacket{
731+
data: decoded_err_packet.encode(),
732+
};
733+
onion_utils::crypt_failure_packet(
734+
&onion_keys[1].shared_secret.as_ref(), &mut onion_error);
735+
msg.reason = onion_error;
722736
}, || nodes[2].node.fail_htlc_backwards(&payment_hash), true, Some(0x1000|7),
723737
Some(NetworkUpdate::ChannelFailure {
724738
short_channel_id: channels[1].0.contents.short_channel_id,

‎lightning/src/ln/onion_utils.rs‎

Lines changed: 70 additions & 80 deletions
Original file line numberDiff line numberDiff line change
@@ -7,6 +7,7 @@
77
// You may not use this file except in accordance with one or both of these
88
// licenses.
99

10+
use super::msgs::OnionErrorPacket;
1011
use crate::blinded_path::BlindedHop;
1112
use crate::crypto::chacha20::ChaCha20;
1213
use crate::crypto::streams::ChaChaReader;
@@ -869,23 +870,20 @@ fn construct_onion_packet_with_init_noise<HD: Writeable, P: Packet>(
869870
Ok(P::new(onion_keys.first().unwrap().ephemeral_pubkey, packet_data, hmac_res))
870871
}
871872

872-
/// Encrypts a failure packet. raw_packet can either be a
873-
/// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
874-
pub(super) fn encrypt_failure_packet(
875-
shared_secret: &[u8], raw_packet: &[u8],
876-
) -> msgs::OnionErrorPacket {
873+
/// Encrypts/decrypts a failure packet.
874+
pub(super) fn crypt_failure_packet(shared_secret: &[u8], packet: &mut OnionErrorPacket) {
877875
let ammag = gen_ammag_from_shared_secret(&shared_secret);
876+
process_chacha(&ammag, &mut packet.data);
877+
}
878878

879-
let mut packet_crypted = Vec::with_capacity(raw_packet.len());
880-
packet_crypted.resize(raw_packet.len(), 0);
881-
let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
882-
chacha.process(&raw_packet, &mut packet_crypted[..]);
883-
msgs::OnionErrorPacket { data: packet_crypted }
879+
pub(super) fn process_chacha(key: &[u8; 32], packet: &mut [u8]) {
880+
let mut chacha = ChaCha20::new(key, &[0u8; 8]);
881+
chacha.process_in_place(packet);
884882
}
885883

886884
pub(super) fn build_failure_packet(
887885
shared_secret: &[u8], failure_type: u16, failure_data: &[u8],
888-
) -> msgs::DecodedOnionErrorPacket {
886+
) -> OnionErrorPacket {
889887
assert_eq!(shared_secret.len(), 32);
890888
assert!(failure_data.len() <= 256 - 2);
891889

@@ -909,15 +907,17 @@ pub(super) fn build_failure_packet(
909907
hmac.input(&packet.encode()[32..]);
910908
packet.hmac = Hmac::from_engine(hmac).to_byte_array();
911909

912-
packet
910+
OnionErrorPacket { data: packet.encode() }
913911
}
914912

915913
#[cfg(test)]
916914
pub(super) fn build_first_hop_failure_packet(
917915
shared_secret: &[u8], failure_type: u16, failure_data: &[u8],
918916
) -> msgs::OnionErrorPacket {
919-
let failure_packet = build_failure_packet(shared_secret, failure_type, failure_data);
920-
encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
917+
let mut failure_packet = build_failure_packet(shared_secret, failure_type, failure_data);
918+
crypt_failure_packet(shared_secret, &mut failure_packet);
919+
920+
failure_packet
921921
}
922922

923923
pub(crate) struct DecodedOnionFailure {
@@ -931,18 +931,12 @@ pub(crate) struct DecodedOnionFailure {
931931
pub(crate) onion_error_data: Option<Vec<u8>>,
932932
}
933933

934-
/// Decrypt the error packet in-place.
935-
fn decrypt_onion_error_packet(packet: &mut Vec<u8>, shared_secret: SharedSecret) {
936-
let ammag = gen_ammag_from_shared_secret(shared_secret.as_ref());
937-
let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
938-
chacha.process_in_place(packet);
939-
}
940-
941934
/// Process failure we got back from upstream on a payment we sent (implying htlc_source is an
942935
/// OutboundRoute).
943936
#[inline]
944937
pub(super) fn process_onion_failure<T: secp256k1::Signing, L: Deref>(
945-
secp_ctx: &Secp256k1<T>, logger: &L, htlc_source: &HTLCSource, mut encrypted_packet: Vec<u8>,
938+
secp_ctx: &Secp256k1<T>, logger: &L, htlc_source: &HTLCSource,
939+
mut encrypted_packet: OnionErrorPacket,
946940
) -> DecodedOnionFailure
947941
where
948942
L::Target: Logger,
@@ -975,7 +969,11 @@ where
975969
const UPDATE: u16 = 0x1000;
976970

977971
// Handle packed channel/node updates for passing back for the route handler
978-
let callback = |shared_secret, _, _, route_hop_opt: Option<&RouteHop>, route_hop_idx| {
972+
let callback = |shared_secret: SharedSecret,
973+
_,
974+
_,
975+
route_hop_opt: Option<&RouteHop>,
976+
route_hop_idx| {
979977
if res.is_some() {
980978
return;
981979
}
@@ -1017,9 +1015,9 @@ where
10171015
{
10181016
// Actually parse the onion error data in tests so we can check that blinded hops fail
10191017
// back correctly.
1020-
decrypt_onion_error_packet(&mut encrypted_packet, shared_secret);
1018+
crypt_failure_packet(shared_secret.as_ref(), &mut encrypted_packet);
10211019
let err_packet = msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(
1022-
&encrypted_packet,
1020+
&encrypted_packet.data,
10231021
))
10241022
.unwrap();
10251023
error_code_ret = Some(u16::from_be_bytes(
@@ -1042,18 +1040,18 @@ where
10421040
let amt_to_forward = htlc_msat - route_hop.fee_msat;
10431041
htlc_msat = amt_to_forward;
10441042

1045-
decrypt_onion_error_packet(&mut encrypted_packet, shared_secret);
1043+
crypt_failure_packet(shared_secret.as_ref(), &mut encrypted_packet);
10461044

10471045
let um = gen_um_from_shared_secret(shared_secret.as_ref());
10481046
let mut hmac = HmacEngine::<Sha256>::new(&um);
1049-
hmac.input(&encrypted_packet[32..]);
1047+
hmac.input(&encrypted_packet.data[32..]);
10501048

1051-
if !fixed_time_eq(&Hmac::from_engine(hmac).to_byte_array(), &encrypted_packet[..32]) {
1049+
if !fixed_time_eq(&Hmac::from_engine(hmac).to_byte_array(), &encrypted_packet.data[..32]) {
10521050
return;
10531051
}
10541052

10551053
let err_packet =
1056-
match msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(&encrypted_packet)) {
1054+
match msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(&encrypted_packet.data)) {
10571055
Ok(p) => p,
10581056
Err(_) => {
10591057
log_warn!(logger, "Unreadable failure from {}", route_hop.pubkey);
@@ -1366,27 +1364,30 @@ impl HTLCFailReason {
13661364
match self.0 {
13671365
HTLCFailReasonRepr::Reason { ref failure_code, ref data } => {
13681366
if let Some(secondary_shared_secret) = secondary_shared_secret {
1369-
let inner_packet =
1370-
build_failure_packet(secondary_shared_secret, *failure_code, &data[..])
1371-
.encode();
1372-
let encrypted_inner_packet =
1373-
encrypt_failure_packet(secondary_shared_secret, &inner_packet);
1374-
encrypt_failure_packet(
1375-
incoming_packet_shared_secret,
1376-
&encrypted_inner_packet.data[..],
1377-
)
1367+
let mut packet =
1368+
build_failure_packet(secondary_shared_secret, *failure_code, &data[..]);
1369+
1370+
crypt_failure_packet(secondary_shared_secret, &mut packet);
1371+
crypt_failure_packet(incoming_packet_shared_secret, &mut packet);
1372+
1373+
packet
13781374
} else {
1379-
let packet = build_failure_packet(
1375+
let mut packet = build_failure_packet(
13801376
incoming_packet_shared_secret,
13811377
*failure_code,
13821378
&data[..],
1383-
)
1384-
.encode();
1385-
encrypt_failure_packet(incoming_packet_shared_secret, &packet)
1379+
);
1380+
crypt_failure_packet(incoming_packet_shared_secret, &mut packet);
1381+
1382+
packet
13861383
}
13871384
},
13881385
HTLCFailReasonRepr::LightningError { ref err } => {
1389-
encrypt_failure_packet(incoming_packet_shared_secret, &err.data)
1386+
let mut err = err.clone();
1387+
1388+
crypt_failure_packet(incoming_packet_shared_secret, &mut err);
1389+
1390+
err
13901391
},
13911392
}
13921393
}
@@ -1399,7 +1400,7 @@ impl HTLCFailReason {
13991400
{
14001401
match self.0 {
14011402
HTLCFailReasonRepr::LightningError { ref err } => {
1402-
process_onion_failure(secp_ctx, logger, &htlc_source, err.data.clone())
1403+
process_onion_failure(secp_ctx, logger, &htlc_source, err.clone())
14031404
},
14041405
#[allow(unused)]
14051406
HTLCFailReasonRepr::Reason { ref failure_code, ref data, .. } => {
@@ -2287,45 +2288,30 @@ mod tests {
22872288
// Returning Errors test vectors from BOLT 4
22882289

22892290
let onion_keys = build_test_onion_keys();
2290-
let onion_error =
2291+
let mut onion_error =
22912292
super::build_failure_packet(onion_keys[4].shared_secret.as_ref(), 0x2002, &[0; 0]);
22922293
let hex = "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";
2293-
assert_eq!(onion_error.encode(), <Vec<u8>>::from_hex(hex).unwrap());
2294+
assert_eq!(onion_error.data, <Vec<u8>>::from_hex(hex).unwrap());
22942295

2295-
let onion_packet_1 = super::encrypt_failure_packet(
2296-
onion_keys[4].shared_secret.as_ref(),
2297-
&onion_error.encode()[..],
2298-
);
2296+
super::crypt_failure_packet(onion_keys[4].shared_secret.as_ref(), &mut onion_error);
22992297
let hex = "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";
2300-
assert_eq!(onion_packet_1.data, <Vec<u8>>::from_hex(hex).unwrap());
2298+
assert_eq!(onion_error.data, <Vec<u8>>::from_hex(hex).unwrap());
23012299

2302-
let onion_packet_2 = super::encrypt_failure_packet(
2303-
onion_keys[3].shared_secret.as_ref(),
2304-
&onion_packet_1.data[..],
2305-
);
2300+
super::crypt_failure_packet(onion_keys[3].shared_secret.as_ref(), &mut onion_error);
23062301
let hex = "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";
2307-
assert_eq!(onion_packet_2.data, <Vec<u8>>::from_hex(hex).unwrap());
2302+
assert_eq!(onion_error.data, <Vec<u8>>::from_hex(hex).unwrap());
23082303

2309-
let onion_packet_3 = super::encrypt_failure_packet(
2310-
onion_keys[2].shared_secret.as_ref(),
2311-
&onion_packet_2.data[..],
2312-
);
2304+
super::crypt_failure_packet(onion_keys[2].shared_secret.as_ref(), &mut onion_error);
23132305
let hex = "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";
2314-
assert_eq!(onion_packet_3.data, <Vec<u8>>::from_hex(hex).unwrap());
2306+
assert_eq!(onion_error.data, <Vec<u8>>::from_hex(hex).unwrap());
23152307

2316-
let onion_packet_4 = super::encrypt_failure_packet(
2317-
onion_keys[1].shared_secret.as_ref(),
2318-
&onion_packet_3.data[..],
2319-
);
2308+
super::crypt_failure_packet(onion_keys[1].shared_secret.as_ref(), &mut onion_error);
23202309
let hex = "aac3200c4968f56b21f53e5e374e3a2383ad2b1b6501bbcc45abc31e59b26881b7dfadbb56ec8dae8857add94e6702fb4c3a4de22e2e669e1ed926b04447fc73034bb730f4932acd62727b75348a648a1128744657ca6a4e713b9b646c3ca66cac02cdab44dd3439890ef3aaf61708714f7375349b8da541b2548d452d84de7084bb95b3ac2345201d624d31f4d52078aa0fa05a88b4e20202bd2b86ac5b52919ea305a8949de95e935eed0319cf3cf19ebea61d76ba92532497fcdc9411d06bcd4275094d0a4a3c5d3a945e43305a5a9256e333e1f64dbca5fcd4e03a39b9012d197506e06f29339dfee3331995b21615337ae060233d39befea925cc262873e0530408e6990f1cbd233a150ef7b004ff6166c70c68d9f8c853c1abca640b8660db2921";
2321-
assert_eq!(onion_packet_4.data, <Vec<u8>>::from_hex(hex).unwrap());
2310+
assert_eq!(onion_error.data, <Vec<u8>>::from_hex(hex).unwrap());
23222311

2323-
let onion_packet_5 = super::encrypt_failure_packet(
2324-
onion_keys[0].shared_secret.as_ref(),
2325-
&onion_packet_4.data[..],
2326-
);
2312+
super::crypt_failure_packet(onion_keys[0].shared_secret.as_ref(), &mut onion_error);
23272313
let hex = "9c5add3963fc7f6ed7f148623c84134b5647e1306419dbe2174e523fa9e2fbed3a06a19f899145610741c83ad40b7712aefaddec8c6baf7325d92ea4ca4d1df8bce517f7e54554608bf2bd8071a4f52a7a2f7ffbb1413edad81eeea5785aa9d990f2865dc23b4bc3c301a94eec4eabebca66be5cf638f693ec256aec514620cc28ee4a94bd9565bc4d4962b9d3641d4278fb319ed2b84de5b665f307a2db0f7fbb757366067d88c50f7e829138fde4f78d39b5b5802f1b92a8a820865af5cc79f9f30bc3f461c66af95d13e5e1f0381c184572a91dee1c849048a647a1158cf884064deddbf1b0b88dfe2f791428d0ba0f6fb2f04e14081f69165ae66d9297c118f0907705c9c4954a199bae0bb96fad763d690e7daa6cfda59ba7f2c8d11448b604d12d";
2328-
assert_eq!(onion_packet_5.data, <Vec<u8>>::from_hex(hex).unwrap());
2314+
assert_eq!(onion_error.data, <Vec<u8>>::from_hex(hex).unwrap());
23292315

23302316
let logger: Arc<TestLogger> = Arc::new(TestLogger::new());
23312317
let ctx_full = Secp256k1::new();
@@ -2339,7 +2325,7 @@ mod tests {
23392325

23402326
// Assert that the original failure can be retrieved and that all hmacs check out.
23412327
let decrypted_failure =
2342-
process_onion_failure(&ctx_full, &logger, &htlc_source, onion_packet_5.data);
2328+
process_onion_failure(&ctx_full, &logger, &htlc_source, onion_error);
23432329

23442330
assert_eq!(decrypted_failure.onion_error_code, Some(0x2002));
23452331
}
@@ -2348,10 +2334,11 @@ mod tests {
23482334
fn test_non_attributable_failure_packet_onion() {
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// Create a failure packet with bogus data.
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let packet = vec![1u8; 292];
2337+
let onion_error_packet = OnionErrorPacket { data: packet };
23512338

23522339
// In the current protocol, it is unfortunately not possible to identify the failure source.
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let logger: TestLogger = TestLogger::new();
2354-
let decrypted_failure = test_failure_attribution(&logger, &packet);
2341+
let decrypted_failure = test_failure_attribution(&logger, onion_error_packet);
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assert_eq!(decrypted_failure.short_channel_id, None);
23562343

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logger.assert_log_contains(
@@ -2376,11 +2363,12 @@ mod tests {
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let hmac = Hmac::from_engine(hmac).to_byte_array();
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packet[..32].copy_from_slice(&hmac);
23782365

2379-
let packet = encrypt_failure_packet(shared_secret, &packet);
2366+
let mut onion_error_packet = OnionErrorPacket { data: packet.to_vec() };
2367+
crypt_failure_packet(shared_secret, &mut onion_error_packet);
23802368

23812369
// For the unreadable failure, it is still expected that the failing channel can be identified.
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let logger: TestLogger = TestLogger::new();
2383-
let decrypted_failure = test_failure_attribution(&logger, &packet.data);
2371+
let decrypted_failure = test_failure_attribution(&logger, onion_error_packet);
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assert_eq!(decrypted_failure.short_channel_id, Some(0));
23852373

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logger.assert_log_contains("lightning::ln::onion_utils", "Unreadable failure", 1);
@@ -2401,10 +2389,11 @@ mod tests {
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hmac.input(&packet.encode()[32..]);
24022390
packet.hmac = Hmac::from_engine(hmac).to_byte_array();
24032391

2404-
let packet = encrypt_failure_packet(shared_secret, &packet.encode()[..]);
2392+
let mut onion_error_packet = OnionErrorPacket { data: packet.encode() };
2393+
crypt_failure_packet(shared_secret, &mut onion_error_packet);
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let logger = TestLogger::new();
2407-
let decrypted_failure = test_failure_attribution(&logger, &packet.data);
2396+
let decrypted_failure = test_failure_attribution(&logger, onion_error_packet);
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assert_eq!(decrypted_failure.short_channel_id, Some(0));
24092398

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logger.assert_log_contains(
@@ -2414,7 +2403,9 @@ mod tests {
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);
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}
24162405

2417-
fn test_failure_attribution(logger: &TestLogger, packet: &[u8]) -> DecodedOnionFailure {
2406+
fn test_failure_attribution(
2407+
logger: &TestLogger, packet: OnionErrorPacket,
2408+
) -> DecodedOnionFailure {
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let ctx_full = Secp256k1::new();
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let path = build_test_path();
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let htlc_source = HTLCSource::OutboundRoute {
@@ -2424,8 +2415,7 @@ mod tests {
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payment_id: PaymentId([1; 32]),
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};
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2427-
let decrypted_failure =
2428-
process_onion_failure(&ctx_full, &logger, &htlc_source, packet.into());
2418+
let decrypted_failure = process_onion_failure(&ctx_full, &logger, &htlc_source, packet);
24292419

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decrypted_failure
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}

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