_ Git - rust-lightning/blob - src/ln/msgs.rs

   1 use secp256k1::key::PublicKey;
   2 use secp256k1::{Secp256k1, Signature};
   3 use secp256k1;
   4 use bitcoin::util::hash::Sha256dHash;
   5 use bitcoin::network::serialize::{deserialize,serialize};
   6 use bitcoin::blockdata::script::Script;
   7
   8 use std::error::Error;
   9 use std::{cmp, fmt};
  10 use std::result::Result;
  11
  12 use util::{byte_utils, internal_traits, events};
  13
  14 pub trait MsgEncodable {
  15         fn encode(&self) -> Vec<u8>;
  16         #[inline]
  17         fn encoded_len(&self) -> usize { self.encode().len() }
  18         #[inline]
  19         fn encode_with_len(&self) -> Vec<u8> {
  20                 let enc = self.encode();
  21                 let mut res = Vec::with_capacity(enc.len() + 2);
  22                 res.extend_from_slice(&byte_utils::be16_to_array(enc.len() as u16));
  23                 res.extend_from_slice(&enc);
  24                 res
  25         }
  26 }
  27 #[derive(Debug)]
  28 pub enum DecodeError {
  29         /// Unknown realm byte in an OnionHopData packet
  30         UnknownRealmByte,
  31         /// Failed to decode a public key (ie it's invalid)
  32         BadPublicKey,
  33         /// Failed to decode a signature (ie it's invalid)
  34         BadSignature,
  35         /// Value expected to be text wasn't decodable as text
  36         BadText,
  37         /// Buffer too short
  38         ShortRead,
  39         /// node_announcement included more than one address of a given type!
  40         ExtraAddressesPerType,
  41         /// A length descriptor in the packet didn't describe the later data correctly
  42         /// (currently only generated in node_announcement)
  43         BadLengthDescriptor,
  44 }
  45 pub trait MsgDecodable: Sized {
  46         fn decode(v: &[u8]) -> Result<Self, DecodeError>;
  47 }
  48
  49 /// Tracks localfeatures which are only in init messages
  50 #[derive(Clone, PartialEq)]
  51 pub struct LocalFeatures {
  52         flags: Vec<u8>,
  53 }
  54
  55 impl LocalFeatures {
  56         pub fn new() -> LocalFeatures {
  57                 LocalFeatures {
  58                         flags: Vec::new(),
  59                 }
  60         }
  61
  62         pub fn supports_data_loss_protect(&self) -> bool {
  63                 self.flags.len() > 0 && (self.flags[0] & 3) != 0
  64         }
  65         pub fn requires_data_loss_protect(&self) -> bool {
  66                 self.flags.len() > 0 && (self.flags[0] & 1) != 0
  67         }
  68
  69         pub fn initial_routing_sync(&self) -> bool {
  70                 self.flags.len() > 0 && (self.flags[0] & (1 << 3)) != 0
  71         }
  72         pub fn set_initial_routing_sync(&mut self) {
  73                 if self.flags.len() == 0 {
  74                         self.flags.resize(1, 1 << 3);
  75                 } else {
  76                         self.flags[0] |= 1 << 3;
  77                 }
  78         }
  79
  80         pub fn supports_upfront_shutdown_script(&self) -> bool {
  81                 self.flags.len() > 0 && (self.flags[0] & (3 << 4)) != 0
  82         }
  83         pub fn requires_upfront_shutdown_script(&self) -> bool {
  84                 self.flags.len() > 0 && (self.flags[0] & (1 << 4)) != 0
  85         }
  86
  87         pub fn requires_unknown_bits(&self) -> bool {
  88                 for (idx, &byte) in self.flags.iter().enumerate() {
  89                         if idx != 0 && (byte & 0x55) != 0 {
  90                                 return true;
  91                         } else if idx == 0 && (byte & 0x14) != 0 {
  92                                 return true;
  93                         }
  94                 }
  95                 return false;
  96         }
  97
  98         pub fn supports_unknown_bits(&self) -> bool {
  99                 for (idx, &byte) in self.flags.iter().enumerate() {
 100                         if idx != 0 && byte != 0 {
 101                                 return true;
 102                         } else if idx == 0 && (byte & 0xc4) != 0 {
 103                                 return true;
 104                         }
 105                 }
 106                 return false;
 107         }
 108 }
 109
 110 /// Tracks globalfeatures which are in init messages and routing announcements
 111 #[derive(Clone, PartialEq)]
 112 pub struct GlobalFeatures {
 113         flags: Vec<u8>,
 114 }
 115
 116 impl GlobalFeatures {
 117         pub fn new() -> GlobalFeatures {
 118                 GlobalFeatures {
 119                         flags: Vec::new(),
 120                 }
 121         }
 122
 123         pub fn requires_unknown_bits(&self) -> bool {
 124                 for &byte in self.flags.iter() {
 125                         if (byte & 0x55) != 0 {
 126                                 return true;
 127                         }
 128                 }
 129                 return false;
 130         }
 131
 132         pub fn supports_unknown_bits(&self) -> bool {
 133                 for &byte in self.flags.iter() {
 134                         if byte != 0 {
 135                                 return true;
 136                         }
 137                 }
 138                 return false;
 139         }
 140 }
 141
 142 pub struct Init {
 143         pub global_features: GlobalFeatures,
 144         pub local_features: LocalFeatures,
 145 }
 146
 147 pub struct ErrorMessage {
 148         pub channel_id: [u8; 32],
 149         pub data: String,
 150 }
 151
 152 pub struct Ping {
 153         pub ponglen: u16,
 154         pub byteslen: u16,
 155 }
 156
 157 pub struct Pong {
 158         pub byteslen: u16,
 159 }
 160
 161 pub struct OpenChannel {
 162         pub chain_hash: Sha256dHash,
 163         pub temporary_channel_id: [u8; 32],
 164         pub funding_satoshis: u64,
 165         pub push_msat: u64,
 166         pub dust_limit_satoshis: u64,
 167         pub max_htlc_value_in_flight_msat: u64,
 168         pub channel_reserve_satoshis: u64,
 169         pub htlc_minimum_msat: u64,
 170         pub feerate_per_kw: u32,
 171         pub to_self_delay: u16,
 172         pub max_accepted_htlcs: u16,
 173         pub funding_pubkey: PublicKey,
 174         pub revocation_basepoint: PublicKey,
 175         pub payment_basepoint: PublicKey,
 176         pub delayed_payment_basepoint: PublicKey,
 177         pub htlc_basepoint: PublicKey,
 178         pub first_per_commitment_point: PublicKey,
 179         pub channel_flags: u8,
 180         pub shutdown_scriptpubkey: Option<Script>,
 181 }
 182
 183 pub struct AcceptChannel {
 184         pub temporary_channel_id: [u8; 32],
 185         pub dust_limit_satoshis: u64,
 186         pub max_htlc_value_in_flight_msat: u64,
 187         pub channel_reserve_satoshis: u64,
 188         pub htlc_minimum_msat: u64,
 189         pub minimum_depth: u32,
 190         pub to_self_delay: u16,
 191         pub max_accepted_htlcs: u16,
 192         pub funding_pubkey: PublicKey,
 193         pub revocation_basepoint: PublicKey,
 194         pub payment_basepoint: PublicKey,
 195         pub delayed_payment_basepoint: PublicKey,
 196         pub htlc_basepoint: PublicKey,
 197         pub first_per_commitment_point: PublicKey,
 198         pub shutdown_scriptpubkey: Option<Script>,
 199 }
 200
 201 pub struct FundingCreated {
 202         pub temporary_channel_id: [u8; 32],
 203         pub funding_txid: Sha256dHash,
 204         pub funding_output_index: u16,
 205         pub signature: Signature,
 206 }
 207
 208 pub struct FundingSigned {
 209         pub channel_id: [u8; 32],
 210         pub signature: Signature,
 211 }
 212
 213 pub struct FundingLocked {
 214         pub channel_id: [u8; 32],
 215         pub next_per_commitment_point: PublicKey,
 216 }
 217
 218 pub struct Shutdown {
 219         pub channel_id: [u8; 32],
 220         pub scriptpubkey: Script,
 221 }
 222
 223 pub struct ClosingSigned {
 224         pub channel_id: [u8; 32],
 225         pub fee_satoshis: u64,
 226         pub signature: Signature,
 227 }
 228
 229 #[derive(Clone)]
 230 pub struct UpdateAddHTLC {
 231         pub channel_id: [u8; 32],
 232         pub htlc_id: u64,
 233         pub amount_msat: u64,
 234         pub payment_hash: [u8; 32],
 235         pub cltv_expiry: u32,
 236         pub onion_routing_packet: OnionPacket,
 237 }
 238
 239 #[derive(Clone)]
 240 pub struct UpdateFulfillHTLC {
 241         pub channel_id: [u8; 32],
 242         pub htlc_id: u64,
 243         pub payment_preimage: [u8; 32],
 244 }
 245
 246 #[derive(Clone)]
 247 pub struct UpdateFailHTLC {
 248         pub channel_id: [u8; 32],
 249         pub htlc_id: u64,
 250         pub reason: OnionErrorPacket,
 251 }
 252
 253 #[derive(Clone)]
 254 pub struct UpdateFailMalformedHTLC {
 255         pub channel_id: [u8; 32],
 256         pub htlc_id: u64,
 257         pub sha256_of_onion: [u8; 32],
 258         pub failure_code: u16,
 259 }
 260
 261 #[derive(Clone)]
 262 pub struct CommitmentSigned {
 263         pub channel_id: [u8; 32],
 264         pub signature: Signature,
 265         pub htlc_signatures: Vec<Signature>,
 266 }
 267
 268 pub struct RevokeAndACK {
 269         pub channel_id: [u8; 32],
 270         pub per_commitment_secret: [u8; 32],
 271         pub next_per_commitment_point: PublicKey,
 272 }
 273
 274 pub struct UpdateFee {
 275         pub channel_id: [u8; 32],
 276         pub feerate_per_kw: u32,
 277 }
 278
 279 pub struct DataLossProtect {
 280         pub your_last_per_commitment_secret: [u8; 32],
 281         pub my_current_per_commitment_point: PublicKey,
 282 }
 283
 284 pub struct ChannelReestablish {
 285         pub channel_id: [u8; 32],
 286         pub next_local_commitment_number: u64,
 287         pub next_remote_commitment_number: u64,
 288         pub data_loss_protect: Option<DataLossProtect>,
 289 }
 290
 291 #[derive(Clone)]
 292 pub struct AnnouncementSignatures {
 293         pub channel_id: [u8; 32],
 294         pub short_channel_id: u64,
 295         pub node_signature: Signature,
 296         pub bitcoin_signature: Signature,
 297 }
 298
 299 #[derive(Clone)]
 300 pub enum NetAddress {
 301         IPv4 {
 302                 addr: [u8; 4],
 303                 port: u16,
 304         },
 305         IPv6 {
 306                 addr: [u8; 16],
 307                 port: u16,
 308         },
 309         OnionV2 {
 310                 addr: [u8; 10],
 311                 port: u16,
 312         },
 313         OnionV3 {
 314                 ed25519_pubkey: [u8; 32],
 315                 checksum: u16,
 316                 version: u8,
 317                 port: u16,
 318         },
 319 }
 320 impl NetAddress {
 321         fn get_id(&self) -> u8 {
 322                 match self {
 323                         &NetAddress::IPv4 {..} => { 1 },
 324                         &NetAddress::IPv6 {..} => { 2 },
 325                         &NetAddress::OnionV2 {..} => { 3 },
 326                         &NetAddress::OnionV3 {..} => { 4 },
 327                 }
 328         }
 329 }
 330
 331 pub struct UnsignedNodeAnnouncement {
 332         pub features: GlobalFeatures,
 333         pub timestamp: u32,
 334         pub node_id: PublicKey,
 335         pub rgb: [u8; 3],
 336         pub alias: [u8; 32],
 337         /// List of addresses on which this node is reachable. Note that you may only have up to one
 338         /// address of each type, if you have more, they may be silently discarded or we may panic!
 339         pub addresses: Vec<NetAddress>,
 340 }
 341 pub struct NodeAnnouncement {
 342         pub signature: Signature,
 343         pub contents: UnsignedNodeAnnouncement,
 344 }
 345
 346 #[derive(PartialEq, Clone)]
 347 pub struct UnsignedChannelAnnouncement {
 348         pub features: GlobalFeatures,
 349         pub chain_hash: Sha256dHash,
 350         pub short_channel_id: u64,
 351         pub node_id_1: PublicKey,
 352         pub node_id_2: PublicKey,
 353         pub bitcoin_key_1: PublicKey,
 354         pub bitcoin_key_2: PublicKey,
 355         pub excess_data: Vec<u8>,
 356 }
 357 #[derive(PartialEq, Clone)]
 358 pub struct ChannelAnnouncement {
 359         pub node_signature_1: Signature,
 360         pub node_signature_2: Signature,
 361         pub bitcoin_signature_1: Signature,
 362         pub bitcoin_signature_2: Signature,
 363         pub contents: UnsignedChannelAnnouncement,
 364 }
 365
 366 #[derive(PartialEq, Clone)]
 367 pub struct UnsignedChannelUpdate {
 368         pub chain_hash: Sha256dHash,
 369         pub short_channel_id: u64,
 370         pub timestamp: u32,
 371         pub flags: u16,
 372         pub cltv_expiry_delta: u16,
 373         pub htlc_minimum_msat: u64,
 374         pub fee_base_msat: u32,
 375         pub fee_proportional_millionths: u32,
 376         pub excess_data: Vec<u8>,
 377 }
 378 #[derive(PartialEq, Clone)]
 379 pub struct ChannelUpdate {
 380         pub signature: Signature,
 381         pub contents: UnsignedChannelUpdate,
 382 }
 383
 384 /// Used to put an error message in a HandleError
 385 pub enum ErrorAction {
 386         /// The peer took some action which made us think they were useless. Disconnect them.
 387         DisconnectPeer {
 388                 msg: Option<ErrorMessage>
 389         },
 390         /// The peer did something harmless that we weren't able to process, just log and ignore
 391         IgnoreError,
 392         /// The peer did something incorrect. Tell them.
 393         SendErrorMessage {
 394                 msg: ErrorMessage
 395         },
 396 }
 397
 398 pub struct HandleError { //TODO: rename me
 399         pub err: &'static str,
 400         pub action: Option<ErrorAction>, //TODO: Make this required
 401 }
 402
 403 /// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
 404 /// transaction updates if they were pending.
 405 pub struct CommitmentUpdate {
 406         pub update_add_htlcs: Vec<UpdateAddHTLC>,
 407         pub update_fulfill_htlcs: Vec<UpdateFulfillHTLC>,
 408         pub update_fail_htlcs: Vec<UpdateFailHTLC>,
 409         pub update_fail_malformed_htlcs: Vec<UpdateFailMalformedHTLC>,
 410         pub commitment_signed: CommitmentSigned,
 411 }
 412
 413 pub enum HTLCFailChannelUpdate {
 414         ChannelUpdateMessage {
 415                 msg: ChannelUpdate,
 416         },
 417         ChannelClosed {
 418                 short_channel_id: u64,
 419         },
 420 }
 421
 422 /// A trait to describe an object which can receive channel messages. Messages MAY be called in
 423 /// paralell when they originate from different their_node_ids, however they MUST NOT be called in
 424 /// paralell when the two calls have the same their_node_id.
 425 pub trait ChannelMessageHandler : events::EventsProvider + Send + Sync {
 426         //Channel init:
 427         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<AcceptChannel, HandleError>;
 428         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>;
 429         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated) -> Result<FundingSigned, HandleError>;
 430         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned) -> Result<(), HandleError>;
 431         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked) -> Result<Option<AnnouncementSignatures>, HandleError>;
 432
 433         // Channl close:
 434         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown) -> Result<(Option<Shutdown>, Option<ClosingSigned>), HandleError>;
 435         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned) -> Result<Option<ClosingSigned>, HandleError>;
 436
 437         // HTLC handling:
 438         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC) -> Result<(), HandleError>;
 439         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC) -> Result<(), HandleError>;
 440         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC) -> Result<Option<HTLCFailChannelUpdate>, HandleError>;
 441         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC) -> Result<(), HandleError>;
 442         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned) -> Result<(RevokeAndACK, Option<CommitmentSigned>), HandleError>;
 443         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK) -> Result<Option<CommitmentUpdate>, HandleError>;
 444
 445         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee) -> Result<(), HandleError>;
 446
 447         // Channel-to-announce:
 448         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures) -> Result<(), HandleError>;
 449
 450         // Error conditions:
 451         /// Indicates a connection to the peer failed/an existing connection was lost. If no connection
 452         /// is believed to be possible in the future (eg they're sending us messages we don't
 453         /// understand or indicate they require unknown feature bits), no_connection_possible is set
 454         /// and any outstanding channels should be failed.
 455         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
 456
 457         fn handle_error(&self, their_node_id: &PublicKey, msg: &ErrorMessage);
 458 }
 459
 460 pub trait RoutingMessageHandler : Send + Sync {
 461         fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<(), HandleError>;
 462         /// Handle a channel_announcement message, returning true if it should be forwarded on, false
 463         /// or returning an Err otherwise.
 464         fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, HandleError>;
 465         fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<(), HandleError>;
 466         fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
 467 }
 468
 469 pub struct OnionRealm0HopData {
 470         pub short_channel_id: u64,
 471         pub amt_to_forward: u64,
 472         pub outgoing_cltv_value: u32,
 473         // 12 bytes of 0-padding
 474 }
 475
 476 pub struct OnionHopData {
 477         pub realm: u8,
 478         pub data: OnionRealm0HopData,
 479         pub hmac: [u8; 32],
 480 }
 481 unsafe impl internal_traits::NoDealloc for OnionHopData{}
 482
 483 #[derive(Clone)]
 484 pub struct OnionPacket {
 485         pub version: u8,
 486         /// In order to ensure we always return an error on Onion decode in compliance with BOLT 4, we
 487         /// have to deserialize OnionPackets contained in UpdateAddHTLCs even if the ephemeral public
 488         /// key (here) is bogus, so we hold a Result instead of a PublicKey as we'd like.
 489         pub public_key: Result<PublicKey, secp256k1::Error>,
 490         pub hop_data: [u8; 20*65],
 491         pub hmac: [u8; 32],
 492 }
 493
 494 pub struct DecodedOnionErrorPacket {
 495         pub hmac: [u8; 32],
 496         pub failuremsg: Vec<u8>,
 497         pub pad: Vec<u8>,
 498 }
 499
 500 #[derive(Clone)]
 501 pub struct OnionErrorPacket {
 502         // This really should be a constant size slice, but the spec lets these things be up to 128KB?
 503         // (TODO) We limit it in decode to much lower...
 504         pub data: Vec<u8>,
 505 }
 506
 507 impl Error for DecodeError {
 508         fn description(&self) -> &str {
 509                 match *self {
 510                         DecodeError::UnknownRealmByte => "Unknown realm byte in Onion packet",
 511                         DecodeError::BadPublicKey => "Invalid public key in packet",
 512                         DecodeError::BadSignature => "Invalid signature in packet",
 513                         DecodeError::BadText => "Invalid text in packet",
 514                         DecodeError::ShortRead => "Packet extended beyond the provided bytes",
 515                         DecodeError::ExtraAddressesPerType => "More than one address of a single type",
 516                         DecodeError::BadLengthDescriptor => "A length descriptor in the packet didn't describe the later data correctly",
 517                 }
 518         }
 519 }
 520 impl fmt::Display for DecodeError {
 521         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 522                 f.write_str(self.description())
 523         }
 524 }
 525
 526 impl fmt::Debug for HandleError {
 527         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 528                 f.write_str(self.err)
 529         }
 530 }
 531
 532 macro_rules! secp_pubkey {
 533         ( $ctx: expr, $slice: expr ) => {
 534                 match PublicKey::from_slice($ctx, $slice) {
 535                         Ok(key) => key,
 536                         Err(_) => return Err(DecodeError::BadPublicKey)
 537                 }
 538         };
 539 }
 540
 541 macro_rules! secp_signature {
 542         ( $ctx: expr, $slice: expr ) => {
 543                 match Signature::from_compact($ctx, $slice) {
 544                         Ok(sig) => sig,
 545                         Err(_) => return Err(DecodeError::BadSignature)
 546                 }
 547         };
 548 }
 549
 550 impl MsgDecodable for LocalFeatures {
 551         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 552                 if v.len() < 2 { return Err(DecodeError::ShortRead); }
 553                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 554                 if v.len() < len + 2 { return Err(DecodeError::ShortRead); }
 555                 let mut flags = Vec::with_capacity(len);
 556                 flags.extend_from_slice(&v[2..2 + len]);
 557                 Ok(Self {
 558                         flags: flags
 559                 })
 560         }
 561 }
 562 impl MsgEncodable for LocalFeatures {
 563         fn encode(&self) -> Vec<u8> {
 564                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 565                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 566                 res.extend_from_slice(&self.flags[..]);
 567                 res
 568         }
 569         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 570 }
 571
 572 impl MsgDecodable for GlobalFeatures {
 573         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 574                 if v.len() < 2 { return Err(DecodeError::ShortRead); }
 575                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 576                 if v.len() < len + 2 { return Err(DecodeError::ShortRead); }
 577                 let mut flags = Vec::with_capacity(len);
 578                 flags.extend_from_slice(&v[2..2 + len]);
 579                 Ok(Self {
 580                         flags: flags
 581                 })
 582         }
 583 }
 584 impl MsgEncodable for GlobalFeatures {
 585         fn encode(&self) -> Vec<u8> {
 586                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 587                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 588                 res.extend_from_slice(&self.flags[..]);
 589                 res
 590         }
 591         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 592 }
 593
 594 impl MsgDecodable for Init {
 595         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 596                 let global_features = GlobalFeatures::decode(v)?;
 597                 if v.len() < global_features.flags.len() + 4 {
 598                         return Err(DecodeError::ShortRead);
 599                 }
 600                 let local_features = LocalFeatures::decode(&v[global_features.flags.len() + 2..])?;
 601                 Ok(Self {
 602                         global_features: global_features,
 603                         local_features: local_features,
 604                 })
 605         }
 606 }
 607 impl MsgEncodable for Init {
 608         fn encode(&self) -> Vec<u8> {
 609                 let mut res = Vec::with_capacity(self.global_features.flags.len() + self.local_features.flags.len());
 610                 res.extend_from_slice(&self.global_features.encode()[..]);
 611                 res.extend_from_slice(&self.local_features.encode()[..]);
 612                 res
 613         }
 614 }
 615
 616 impl MsgDecodable for Ping {
 617         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 618                 if v.len() < 4 {
 619                         return Err(DecodeError::ShortRead);
 620                 }
 621                 let ponglen = byte_utils::slice_to_be16(&v[0..2]);
 622                 let byteslen = byte_utils::slice_to_be16(&v[2..4]);
 623                 if v.len() < 4 + byteslen as usize {
 624                         return Err(DecodeError::ShortRead);
 625                 }
 626                 Ok(Self {
 627                         ponglen,
 628                         byteslen,
 629                 })
 630         }
 631 }
 632 impl MsgEncodable for Ping {
 633         fn encode(&self) -> Vec<u8> {
 634                 let mut res = Vec::with_capacity(self.byteslen as usize + 2);
 635                 res.extend_from_slice(&byte_utils::be16_to_array(self.byteslen));
 636                 res.resize(2 + self.byteslen as usize, 0);
 637                 res
 638         }
 639 }
 640
 641 impl MsgDecodable for Pong {
 642         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 643                 if v.len() < 2 {
 644                         return Err(DecodeError::ShortRead);
 645                 }
 646                 let byteslen = byte_utils::slice_to_be16(&v[0..2]);
 647                 if v.len() < 2 + byteslen as usize {
 648                         return Err(DecodeError::ShortRead);
 649                 }
 650                 Ok(Self {
 651                         byteslen
 652                 })
 653         }
 654 }
 655 impl MsgEncodable for Pong {
 656         fn encode(&self) -> Vec<u8> {
 657                 let mut res = Vec::with_capacity(self.byteslen as usize + 2);
 658                 res.extend_from_slice(&byte_utils::be16_to_array(self.byteslen));
 659                 res.resize(2 + self.byteslen as usize, 0);
 660                 res
 661         }
 662 }
 663
 664 impl MsgDecodable for OpenChannel {
 665         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 666                 if v.len() < 2*32+6*8+4+2*2+6*33+1 {
 667                         return Err(DecodeError::ShortRead);
 668                 }
 669                 let ctx = Secp256k1::without_caps();
 670
 671                 let mut shutdown_scriptpubkey = None;
 672                 if v.len() >= 321 {
 673                         let len = byte_utils::slice_to_be16(&v[319..321]) as usize;
 674                         if v.len() < 321+len {
 675                                 return Err(DecodeError::ShortRead);
 676                         }
 677                         shutdown_scriptpubkey = Some(Script::from(v[321..321+len].to_vec()));
 678                 }
 679
 680                 Ok(OpenChannel {
 681                         chain_hash: deserialize(&v[0..32]).unwrap(),
 682                         temporary_channel_id: deserialize(&v[32..64]).unwrap(),
 683                         funding_satoshis: byte_utils::slice_to_be64(&v[64..72]),
 684                         push_msat: byte_utils::slice_to_be64(&v[72..80]),
 685                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[80..88]),
 686                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[88..96]),
 687                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[96..104]),
 688                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[104..112]),
 689                         feerate_per_kw: byte_utils::slice_to_be32(&v[112..116]),
 690                         to_self_delay: byte_utils::slice_to_be16(&v[116..118]),
 691                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[118..120]),
 692                         funding_pubkey: secp_pubkey!(&ctx, &v[120..153]),
 693                         revocation_basepoint: secp_pubkey!(&ctx, &v[153..186]),
 694                         payment_basepoint: secp_pubkey!(&ctx, &v[186..219]),
 695                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[219..252]),
 696                         htlc_basepoint: secp_pubkey!(&ctx, &v[252..285]),
 697                         first_per_commitment_point: secp_pubkey!(&ctx, &v[285..318]),
 698                         channel_flags: v[318],
 699                         shutdown_scriptpubkey: shutdown_scriptpubkey
 700                 })
 701         }
 702 }
 703 impl MsgEncodable for OpenChannel {
 704         fn encode(&self) -> Vec<u8> {
 705                 let mut res = match &self.shutdown_scriptpubkey {
 706                         &Some(ref script) => Vec::with_capacity(319 + 2 + script.len()),
 707                         &None => Vec::with_capacity(319),
 708                 };
 709                 res.extend_from_slice(&serialize(&self.chain_hash).unwrap());
 710                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap());
 711                 res.extend_from_slice(&byte_utils::be64_to_array(self.funding_satoshis));
 712                 res.extend_from_slice(&byte_utils::be64_to_array(self.push_msat));
 713                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 714                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 715                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 716                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 717                 res.extend_from_slice(&byte_utils::be32_to_array(self.feerate_per_kw));
 718                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 719                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 720                 res.extend_from_slice(&self.funding_pubkey.serialize());
 721                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 722                 res.extend_from_slice(&self.payment_basepoint.serialize());
 723                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 724                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 725                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 726                 res.push(self.channel_flags);
 727                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 728                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 729                         res.extend_from_slice(&script[..]);
 730                 }
 731                 res
 732         }
 733 }
 734
 735 impl MsgDecodable for AcceptChannel {
 736         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 737                 if v.len() < 32+4*8+4+2*2+6*33 {
 738                         return Err(DecodeError::ShortRead);
 739                 }
 740                 let ctx = Secp256k1::without_caps();
 741
 742                 let mut shutdown_scriptpubkey = None;
 743                 if v.len() >= 272 {
 744                         let len = byte_utils::slice_to_be16(&v[270..272]) as usize;
 745                         if v.len() < 272+len {
 746                                 return Err(DecodeError::ShortRead);
 747                         }
 748                         shutdown_scriptpubkey = Some(Script::from(v[272..272+len].to_vec()));
 749                 }
 750
 751                 let mut temporary_channel_id = [0; 32];
 752                 temporary_channel_id[..].copy_from_slice(&v[0..32]);
 753                 Ok(Self {
 754                         temporary_channel_id,
 755                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 756                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[40..48]),
 757                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[48..56]),
 758                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[56..64]),
 759                         minimum_depth: byte_utils::slice_to_be32(&v[64..68]),
 760                         to_self_delay: byte_utils::slice_to_be16(&v[68..70]),
 761                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[70..72]),
 762                         funding_pubkey: secp_pubkey!(&ctx, &v[72..105]),
 763                         revocation_basepoint: secp_pubkey!(&ctx, &v[105..138]),
 764                         payment_basepoint: secp_pubkey!(&ctx, &v[138..171]),
 765                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[171..204]),
 766                         htlc_basepoint: secp_pubkey!(&ctx, &v[204..237]),
 767                         first_per_commitment_point: secp_pubkey!(&ctx, &v[237..270]),
 768                         shutdown_scriptpubkey: shutdown_scriptpubkey
 769                 })
 770         }
 771 }
 772 impl MsgEncodable for AcceptChannel {
 773         fn encode(&self) -> Vec<u8> {
 774                 let mut res = match &self.shutdown_scriptpubkey {
 775                         &Some(ref script) => Vec::with_capacity(270 + 2 + script.len()),
 776                         &None => Vec::with_capacity(270),
 777                 };
 778                 res.extend_from_slice(&self.temporary_channel_id);
 779                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 780                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 781                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 782                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 783                 res.extend_from_slice(&byte_utils::be32_to_array(self.minimum_depth));
 784                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 785                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 786                 res.extend_from_slice(&self.funding_pubkey.serialize());
 787                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 788                 res.extend_from_slice(&self.payment_basepoint.serialize());
 789                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 790                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 791                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 792                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 793                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 794                         res.extend_from_slice(&script[..]);
 795                 }
 796                 res
 797         }
 798 }
 799
 800 impl MsgDecodable for FundingCreated {
 801         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 802                 if v.len() < 32+32+2+64 {
 803                         return Err(DecodeError::ShortRead);
 804                 }
 805                 let ctx = Secp256k1::without_caps();
 806                 let mut temporary_channel_id = [0; 32];
 807                 temporary_channel_id[..].copy_from_slice(&v[0..32]);
 808                 Ok(Self {
 809                         temporary_channel_id,
 810                         funding_txid: deserialize(&v[32..64]).unwrap(),
 811                         funding_output_index: byte_utils::slice_to_be16(&v[64..66]),
 812                         signature: secp_signature!(&ctx, &v[66..130]),
 813                 })
 814         }
 815 }
 816 impl MsgEncodable for FundingCreated {
 817         fn encode(&self) -> Vec<u8> {
 818                 let mut res = Vec::with_capacity(32+32+2+64);
 819                 res.extend_from_slice(&self.temporary_channel_id);
 820                 res.extend_from_slice(&serialize(&self.funding_txid).unwrap()[..]);
 821                 res.extend_from_slice(&byte_utils::be16_to_array(self.funding_output_index));
 822                 let secp_ctx = Secp256k1::without_caps();
 823                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 824                 res
 825         }
 826 }
 827
 828 impl MsgDecodable for FundingSigned {
 829         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 830                 if v.len() < 32+64 {
 831                         return Err(DecodeError::ShortRead);
 832                 }
 833                 let ctx = Secp256k1::without_caps();
 834                 let mut channel_id = [0; 32];
 835                 channel_id[..].copy_from_slice(&v[0..32]);
 836                 Ok(Self {
 837                         channel_id,
 838                         signature: secp_signature!(&ctx, &v[32..96]),
 839                 })
 840         }
 841 }
 842 impl MsgEncodable for FundingSigned {
 843         fn encode(&self) -> Vec<u8> {
 844                 let mut res = Vec::with_capacity(32+64);
 845                 res.extend_from_slice(&self.channel_id);
 846                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps()));
 847                 res
 848         }
 849 }
 850
 851 impl MsgDecodable for FundingLocked {
 852         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 853                 if v.len() < 32+33 {
 854                         return Err(DecodeError::ShortRead);
 855                 }
 856                 let ctx = Secp256k1::without_caps();
 857                 let mut channel_id = [0; 32];
 858                 channel_id[..].copy_from_slice(&v[0..32]);
 859                 Ok(Self {
 860                         channel_id,
 861                         next_per_commitment_point: secp_pubkey!(&ctx, &v[32..65]),
 862                 })
 863         }
 864 }
 865 impl MsgEncodable for FundingLocked {
 866         fn encode(&self) -> Vec<u8> {
 867                 let mut res = Vec::with_capacity(32+33);
 868                 res.extend_from_slice(&self.channel_id);
 869                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
 870                 res
 871         }
 872 }
 873
 874 impl MsgDecodable for Shutdown {
 875         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 876                 if v.len() < 32 + 2 {
 877                         return Err(DecodeError::ShortRead);
 878                 }
 879                 let scriptlen = byte_utils::slice_to_be16(&v[32..34]) as usize;
 880                 if v.len() < 32 + 2 + scriptlen {
 881                         return Err(DecodeError::ShortRead);
 882                 }
 883                 let mut channel_id = [0; 32];
 884                 channel_id[..].copy_from_slice(&v[0..32]);
 885                 Ok(Self {
 886                         channel_id,
 887                         scriptpubkey: Script::from(v[34..34 + scriptlen].to_vec()),
 888                 })
 889         }
 890 }
 891 impl MsgEncodable for Shutdown {
 892         fn encode(&self) -> Vec<u8> {
 893                 let mut res = Vec::with_capacity(32 + 2 + self.scriptpubkey.len());
 894                 res.extend_from_slice(&self.channel_id);
 895                 res.extend_from_slice(&byte_utils::be16_to_array(self.scriptpubkey.len() as u16));
 896                 res.extend_from_slice(&self.scriptpubkey[..]);
 897                 res
 898         }
 899 }
 900
 901 impl MsgDecodable for ClosingSigned {
 902         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 903                 if v.len() < 32 + 8 + 64 {
 904                         return Err(DecodeError::ShortRead);
 905                 }
 906                 let secp_ctx = Secp256k1::without_caps();
 907                 let mut channel_id = [0; 32];
 908                 channel_id[..].copy_from_slice(&v[0..32]);
 909                 Ok(Self {
 910                         channel_id,
 911                         fee_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 912                         signature: secp_signature!(&secp_ctx, &v[40..104]),
 913                 })
 914         }
 915 }
 916 impl MsgEncodable for ClosingSigned {
 917         fn encode(&self) -> Vec<u8> {
 918                 let mut res = Vec::with_capacity(32+8+64);
 919                 res.extend_from_slice(&self.channel_id);
 920                 res.extend_from_slice(&byte_utils::be64_to_array(self.fee_satoshis));
 921                 let secp_ctx = Secp256k1::without_caps();
 922                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 923                 res
 924         }
 925 }
 926
 927 impl MsgDecodable for UpdateAddHTLC {
 928         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 929                 if v.len() < 32+8+8+32+4+1+33+20*65+32 {
 930                         return Err(DecodeError::ShortRead);
 931                 }
 932                 let mut channel_id = [0; 32];
 933                 channel_id[..].copy_from_slice(&v[0..32]);
 934                 let mut payment_hash = [0; 32];
 935                 payment_hash.copy_from_slice(&v[48..80]);
 936                 Ok(Self{
 937                         channel_id,
 938                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 939                         amount_msat: byte_utils::slice_to_be64(&v[40..48]),
 940                         payment_hash,
 941                         cltv_expiry: byte_utils::slice_to_be32(&v[80..84]),
 942                         onion_routing_packet: OnionPacket::decode(&v[84..84+1366])?,
 943                 })
 944         }
 945 }
 946 impl MsgEncodable for UpdateAddHTLC {
 947         fn encode(&self) -> Vec<u8> {
 948                 let mut res = Vec::with_capacity(32+8+8+32+4+1366);
 949                 res.extend_from_slice(&self.channel_id);
 950                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 951                 res.extend_from_slice(&byte_utils::be64_to_array(self.amount_msat));
 952                 res.extend_from_slice(&self.payment_hash);
 953                 res.extend_from_slice(&byte_utils::be32_to_array(self.cltv_expiry));
 954                 res.extend_from_slice(&self.onion_routing_packet.encode()[..]);
 955                 res
 956         }
 957 }
 958
 959 impl MsgDecodable for UpdateFulfillHTLC {
 960         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 961                 if v.len() < 32+8+32 {
 962                         return Err(DecodeError::ShortRead);
 963                 }
 964                 let mut channel_id = [0; 32];
 965                 channel_id[..].copy_from_slice(&v[0..32]);
 966                 let mut payment_preimage = [0; 32];
 967                 payment_preimage.copy_from_slice(&v[40..72]);
 968                 Ok(Self{
 969                         channel_id,
 970                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 971                         payment_preimage,
 972                 })
 973         }
 974 }
 975 impl MsgEncodable for UpdateFulfillHTLC {
 976         fn encode(&self) -> Vec<u8> {
 977                 let mut res = Vec::with_capacity(32+8+32);
 978                 res.extend_from_slice(&self.channel_id);
 979                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 980                 res.extend_from_slice(&self.payment_preimage);
 981                 res
 982         }
 983 }
 984
 985 impl MsgDecodable for UpdateFailHTLC {
 986         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 987                 if v.len() < 32+8 {
 988                         return Err(DecodeError::ShortRead);
 989                 }
 990                 let mut channel_id = [0; 32];
 991                 channel_id[..].copy_from_slice(&v[0..32]);
 992                 Ok(Self{
 993                         channel_id,
 994                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 995                         reason: OnionErrorPacket::decode(&v[40..])?,
 996                 })
 997         }
 998 }
 999 impl MsgEncodable for UpdateFailHTLC {
1000         fn encode(&self) -> Vec<u8> {
1001                 let reason = self.reason.encode();
1002                 let mut res = Vec::with_capacity(32+8+reason.len());
1003                 res.extend_from_slice(&self.channel_id);
1004                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
1005                 res.extend_from_slice(&reason[..]);
1006                 res
1007         }
1008 }
1009
1010 impl MsgDecodable for UpdateFailMalformedHTLC {
1011         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1012                 if v.len() < 32+8+32+2 {
1013                         return Err(DecodeError::ShortRead);
1014                 }
1015                 let mut channel_id = [0; 32];
1016                 channel_id[..].copy_from_slice(&v[0..32]);
1017                 let mut sha256_of_onion = [0; 32];
1018                 sha256_of_onion.copy_from_slice(&v[40..72]);
1019                 Ok(Self{
1020                         channel_id,
1021                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
1022                         sha256_of_onion,
1023                         failure_code: byte_utils::slice_to_be16(&v[72..74]),
1024                 })
1025         }
1026 }
1027 impl MsgEncodable for UpdateFailMalformedHTLC {
1028         fn encode(&self) -> Vec<u8> {
1029                 let mut res = Vec::with_capacity(32+8+32+2);
1030                 res.extend_from_slice(&self.channel_id);
1031                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
1032                 res.extend_from_slice(&self.sha256_of_onion);
1033                 res.extend_from_slice(&byte_utils::be16_to_array(self.failure_code));
1034                 res
1035         }
1036 }
1037
1038 impl MsgDecodable for CommitmentSigned {
1039         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1040                 if v.len() < 32+64+2 {
1041                         return Err(DecodeError::ShortRead);
1042                 }
1043                 let mut channel_id = [0; 32];
1044                 channel_id[..].copy_from_slice(&v[0..32]);
1045
1046                 let htlcs = byte_utils::slice_to_be16(&v[96..98]) as usize;
1047                 if v.len() < 32+64+2+htlcs*64 {
1048                         return Err(DecodeError::ShortRead);
1049                 }
1050                 let mut htlc_signatures = Vec::with_capacity(htlcs);
1051                 let secp_ctx = Secp256k1::without_caps();
1052                 for i in 0..htlcs {
1053                         htlc_signatures.push(secp_signature!(&secp_ctx, &v[98+i*64..98+(i+1)*64]));
1054                 }
1055                 Ok(Self {
1056                         channel_id,
1057                         signature: secp_signature!(&secp_ctx, &v[32..96]),
1058                         htlc_signatures,
1059                 })
1060         }
1061 }
1062 impl MsgEncodable for CommitmentSigned {
1063         fn encode(&self) -> Vec<u8> {
1064                 let mut res = Vec::with_capacity(32+64+2+self.htlc_signatures.len()*64);
1065                 res.extend_from_slice(&self.channel_id);
1066                 let secp_ctx = Secp256k1::without_caps();
1067                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
1068                 res.extend_from_slice(&byte_utils::be16_to_array(self.htlc_signatures.len() as u16));
1069                 for i in 0..self.htlc_signatures.len() {
1070                         res.extend_from_slice(&self.htlc_signatures[i].serialize_compact(&secp_ctx));
1071                 }
1072                 res
1073         }
1074 }
1075
1076 impl MsgDecodable for RevokeAndACK {
1077         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1078                 if v.len() < 32+32+33 {
1079                         return Err(DecodeError::ShortRead);
1080                 }
1081                 let mut channel_id = [0; 32];
1082                 channel_id[..].copy_from_slice(&v[0..32]);
1083                 let mut per_commitment_secret = [0; 32];
1084                 per_commitment_secret.copy_from_slice(&v[32..64]);
1085                 let secp_ctx = Secp256k1::without_caps();
1086                 Ok(Self {
1087                         channel_id,
1088                         per_commitment_secret,
1089                         next_per_commitment_point: secp_pubkey!(&secp_ctx, &v[64..97]),
1090                 })
1091         }
1092 }
1093 impl MsgEncodable for RevokeAndACK {
1094         fn encode(&self) -> Vec<u8> {
1095                 let mut res = Vec::with_capacity(32+32+33);
1096                 res.extend_from_slice(&self.channel_id);
1097                 res.extend_from_slice(&self.per_commitment_secret);
1098                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
1099                 res
1100         }
1101 }
1102
1103 impl MsgDecodable for UpdateFee {
1104         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1105                 if v.len() < 32+4 {
1106                         return Err(DecodeError::ShortRead);
1107                 }
1108                 let mut channel_id = [0; 32];
1109                 channel_id[..].copy_from_slice(&v[0..32]);
1110                 Ok(Self {
1111                         channel_id,
1112                         feerate_per_kw: byte_utils::slice_to_be32(&v[32..36]),
1113                 })
1114         }
1115 }
1116 impl MsgEncodable for UpdateFee {
1117         fn encode(&self) -> Vec<u8> {
1118                 let mut res = Vec::with_capacity(32+4);
1119                 res.extend_from_slice(&self.channel_id);
1120                 res.extend_from_slice(&byte_utils::be32_to_array(self.feerate_per_kw));
1121                 res
1122         }
1123 }
1124
1125 impl MsgDecodable for ChannelReestablish {
1126         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1127                 if v.len() < 32+2*8 {
1128                         return Err(DecodeError::ShortRead);
1129                 }
1130
1131                 let data_loss_protect = if v.len() > 32+2*8 {
1132                         if v.len() < 32+2*8 + 33+32 {
1133                                 return Err(DecodeError::ShortRead);
1134                         }
1135                         let mut inner_array = [0; 32];
1136                         inner_array.copy_from_slice(&v[48..48+32]);
1137                         Some(DataLossProtect {
1138                                 your_last_per_commitment_secret: inner_array,
1139                                 my_current_per_commitment_point: secp_pubkey!(&Secp256k1::without_caps(), &v[48+32..48+32+33]),
1140                         })
1141                 } else { None };
1142
1143                 Ok(Self {
1144                         channel_id: deserialize(&v[0..32]).unwrap(),
1145                         next_local_commitment_number: byte_utils::slice_to_be64(&v[32..40]),
1146                         next_remote_commitment_number: byte_utils::slice_to_be64(&v[40..48]),
1147                         data_loss_protect: data_loss_protect,
1148                 })
1149         }
1150 }
1151 impl MsgEncodable for ChannelReestablish {
1152         fn encode(&self) -> Vec<u8> {
1153                 let mut res = Vec::with_capacity(if self.data_loss_protect.is_some() { 32+2*8+33+32 } else { 32+2*8 });
1154
1155                 res.extend_from_slice(&serialize(&self.channel_id).unwrap()[..]);
1156                 res.extend_from_slice(&byte_utils::be64_to_array(self.next_local_commitment_number));
1157                 res.extend_from_slice(&byte_utils::be64_to_array(self.next_remote_commitment_number));
1158
1159                 if let &Some(ref data_loss_protect) = &self.data_loss_protect {
1160                         res.extend_from_slice(&data_loss_protect.your_last_per_commitment_secret[..]);
1161                         res.extend_from_slice(&data_loss_protect.my_current_per_commitment_point.serialize());
1162                 }
1163                 res
1164         }
1165 }
1166
1167 impl MsgDecodable for AnnouncementSignatures {
1168         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1169                 if v.len() < 32+8+64*2 {
1170                         return Err(DecodeError::ShortRead);
1171                 }
1172                 let secp_ctx = Secp256k1::without_caps();
1173                 let mut channel_id = [0; 32];
1174                 channel_id[..].copy_from_slice(&v[0..32]);
1175                 Ok(Self {
1176                         channel_id,
1177                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1178                         node_signature: secp_signature!(&secp_ctx, &v[40..104]),
1179                         bitcoin_signature: secp_signature!(&secp_ctx, &v[104..168]),
1180                 })
1181         }
1182 }
1183 impl MsgEncodable for AnnouncementSignatures {
1184         fn encode(&self) -> Vec<u8> {
1185                 let mut res = Vec::with_capacity(32+8+64*2);
1186                 res.extend_from_slice(&self.channel_id);
1187                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1188                 let secp_ctx = Secp256k1::without_caps();
1189                 res.extend_from_slice(&self.node_signature.serialize_compact(&secp_ctx));
1190                 res.extend_from_slice(&self.bitcoin_signature.serialize_compact(&secp_ctx));
1191                 res
1192         }
1193 }
1194
1195 impl MsgDecodable for UnsignedNodeAnnouncement {
1196         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1197                 let features = GlobalFeatures::decode(&v[..])?;
1198                 if v.len() < features.encoded_len() + 4 + 33 + 3 + 32 + 2 {
1199                         return Err(DecodeError::ShortRead);
1200                 }
1201                 let start = features.encoded_len();
1202
1203                 let mut rgb = [0; 3];
1204                 rgb.copy_from_slice(&v[start + 37..start + 40]);
1205
1206                 let mut alias = [0; 32];
1207                 alias.copy_from_slice(&v[start + 40..start + 72]);
1208
1209                 let addrlen = byte_utils::slice_to_be16(&v[start + 72..start + 74]) as usize;
1210                 if v.len() < start + 74 + addrlen {
1211                         return Err(DecodeError::ShortRead);
1212                 }
1213                 let addr_read_limit = start + 74 + addrlen;
1214
1215                 let mut addresses = Vec::with_capacity(4);
1216                 let mut read_pos = start + 74;
1217                 loop {
1218                         if addr_read_limit <= read_pos { break; }
1219                         match v[read_pos] {
1220                                 0 => { read_pos += 1; },
1221                                 1 => {
1222                                         if addresses.len() > 0 {
1223                                                 return Err(DecodeError::ExtraAddressesPerType);
1224                                         }
1225                                         if addr_read_limit < read_pos + 1 + 6 {
1226                                                 return Err(DecodeError::BadLengthDescriptor);
1227                                         }
1228                                         let mut addr = [0; 4];
1229                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 5]);
1230                                         addresses.push(NetAddress::IPv4 {
1231                                                 addr,
1232                                                 port: byte_utils::slice_to_be16(&v[read_pos + 5..read_pos + 7]),
1233                                         });
1234                                         read_pos += 1 + 6;
1235                                 },
1236                                 2 => {
1237                                         if addresses.len() > 1 || (addresses.len() == 1 && addresses[0].get_id() != 1) {
1238                                                 return Err(DecodeError::ExtraAddressesPerType);
1239                                         }
1240                                         if addr_read_limit < read_pos + 1 + 18 {
1241                                                 return Err(DecodeError::BadLengthDescriptor);
1242                                         }
1243                                         let mut addr = [0; 16];
1244                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 17]);
1245                                         addresses.push(NetAddress::IPv6 {
1246                                                 addr,
1247                                                 port: byte_utils::slice_to_be16(&v[read_pos + 17..read_pos + 19]),
1248                                         });
1249                                         read_pos += 1 + 18;
1250                                 },
1251                                 3 => {
1252                                         if addresses.len() > 2 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 2) {
1253                                                 return Err(DecodeError::ExtraAddressesPerType);
1254                                         }
1255                                         if addr_read_limit < read_pos + 1 + 12 {
1256                                                 return Err(DecodeError::BadLengthDescriptor);
1257                                         }
1258                                         let mut addr = [0; 10];
1259                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 11]);
1260                                         addresses.push(NetAddress::OnionV2 {
1261                                                 addr,
1262                                                 port: byte_utils::slice_to_be16(&v[read_pos + 11..read_pos + 13]),
1263                                         });
1264                                         read_pos += 1 + 12;
1265                                 },
1266                                 4 => {
1267                                         if addresses.len() > 3 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 3) {
1268                                                 return Err(DecodeError::ExtraAddressesPerType);
1269                                         }
1270                                         if addr_read_limit < read_pos + 1 + 37 {
1271                                                 return Err(DecodeError::BadLengthDescriptor);
1272                                         }
1273                                         let mut ed25519_pubkey = [0; 32];
1274                                         ed25519_pubkey.copy_from_slice(&v[read_pos + 1..read_pos + 33]);
1275                                         addresses.push(NetAddress::OnionV3 {
1276                                                 ed25519_pubkey,
1277                                                 checksum: byte_utils::slice_to_be16(&v[read_pos + 33..read_pos + 35]),
1278                                                 version: v[read_pos + 35],
1279                                                 port: byte_utils::slice_to_be16(&v[read_pos + 36..read_pos + 38]),
1280                                         });
1281                                         read_pos += 1 + 37;
1282                                 },
1283                                 _ => { break; } // We've read all we can, we dont understand anything higher (and they're sorted)
1284                         }
1285                 }
1286
1287                 let secp_ctx = Secp256k1::without_caps();
1288                 Ok(Self {
1289                         features,
1290                         timestamp: byte_utils::slice_to_be32(&v[start..start + 4]),
1291                         node_id: secp_pubkey!(&secp_ctx, &v[start + 4..start + 37]),
1292                         rgb,
1293                         alias,
1294                         addresses,
1295                 })
1296         }
1297 }
1298 impl MsgEncodable for UnsignedNodeAnnouncement {
1299         fn encode(&self) -> Vec<u8> {
1300                 let features = self.features.encode();
1301                 let mut res = Vec::with_capacity(74 + features.len() + self.addresses.len());
1302                 res.extend_from_slice(&features[..]);
1303                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1304                 res.extend_from_slice(&self.node_id.serialize());
1305                 res.extend_from_slice(&self.rgb);
1306                 res.extend_from_slice(&self.alias);
1307                 let mut addr_slice = Vec::with_capacity(self.addresses.len() * 18);
1308                 let mut addrs_to_encode = self.addresses.clone();
1309                 addrs_to_encode.sort_unstable_by(|a, b| { a.get_id().cmp(&b.get_id()) });
1310                 addrs_to_encode.dedup_by(|a, b| { a.get_id() == b.get_id() });
1311                 for addr in addrs_to_encode.iter() {
1312                         match addr {
1313                                 &NetAddress::IPv4{addr, port} => {
1314                                         addr_slice.push(1);
1315                                         addr_slice.extend_from_slice(&addr);
1316                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1317                                 },
1318                                 &NetAddress::IPv6{addr, port} => {
1319                                         addr_slice.push(2);
1320                                         addr_slice.extend_from_slice(&addr);
1321                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1322                                 },
1323                                 &NetAddress::OnionV2{addr, port} => {
1324                                         addr_slice.push(3);
1325                                         addr_slice.extend_from_slice(&addr);
1326                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1327                                 },
1328                                 &NetAddress::OnionV3{ed25519_pubkey, checksum, version, port} => {
1329                                         addr_slice.push(4);
1330                                         addr_slice.extend_from_slice(&ed25519_pubkey);
1331                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(checksum));
1332                                         addr_slice.push(version);
1333                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1334                                 },
1335                         }
1336                 }
1337                 res.extend_from_slice(&byte_utils::be16_to_array(addr_slice.len() as u16));
1338                 res.extend_from_slice(&addr_slice[..]);
1339                 res
1340         }
1341 }
1342
1343 impl MsgDecodable for NodeAnnouncement {
1344         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1345                 if v.len() < 64 {
1346                         return Err(DecodeError::ShortRead);
1347                 }
1348                 let secp_ctx = Secp256k1::without_caps();
1349                 Ok(Self {
1350                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1351                         contents: UnsignedNodeAnnouncement::decode(&v[64..])?,
1352                 })
1353         }
1354 }
1355 impl MsgEncodable for NodeAnnouncement {
1356         fn encode(&self) -> Vec<u8> {
1357                 let contents = self.contents.encode();
1358                 let mut res = Vec::with_capacity(64 + contents.len());
1359                 let secp_ctx = Secp256k1::without_caps();
1360                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
1361                 res.extend_from_slice(&contents);
1362                 res
1363         }
1364 }
1365
1366 impl MsgDecodable for UnsignedChannelAnnouncement {
1367         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1368                 let features = GlobalFeatures::decode(&v[..])?;
1369                 if v.len() < features.encoded_len() + 32 + 8 + 33*4 {
1370                         return Err(DecodeError::ShortRead);
1371                 }
1372                 let start = features.encoded_len();
1373                 let secp_ctx = Secp256k1::without_caps();
1374                 let mut excess_data = Vec::with_capacity(v.len() - start - 172);
1375                 excess_data.extend_from_slice(&v[start + 172..]);
1376                 Ok(Self {
1377                         features,
1378                         chain_hash: deserialize(&v[start..start + 32]).unwrap(),
1379                         short_channel_id: byte_utils::slice_to_be64(&v[start + 32..start + 40]),
1380                         node_id_1: secp_pubkey!(&secp_ctx, &v[start + 40..start + 73]),
1381                         node_id_2: secp_pubkey!(&secp_ctx, &v[start + 73..start + 106]),
1382                         bitcoin_key_1: secp_pubkey!(&secp_ctx, &v[start + 106..start + 139]),
1383                         bitcoin_key_2: secp_pubkey!(&secp_ctx, &v[start + 139..start + 172]),
1384                         excess_data,
1385                 })
1386         }
1387 }
1388 impl MsgEncodable for UnsignedChannelAnnouncement {
1389         fn encode(&self) -> Vec<u8> {
1390                 let features = self.features.encode();
1391                 let mut res = Vec::with_capacity(172 + features.len() + self.excess_data.len());
1392                 res.extend_from_slice(&features[..]);
1393                 res.extend_from_slice(&self.chain_hash[..]);
1394                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1395                 res.extend_from_slice(&self.node_id_1.serialize());
1396                 res.extend_from_slice(&self.node_id_2.serialize());
1397                 res.extend_from_slice(&self.bitcoin_key_1.serialize());
1398                 res.extend_from_slice(&self.bitcoin_key_2.serialize());
1399                 res.extend_from_slice(&self.excess_data[..]);
1400                 res
1401         }
1402 }
1403
1404 impl MsgDecodable for ChannelAnnouncement {
1405         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1406                 if v.len() < 64*4 {
1407                         return Err(DecodeError::ShortRead);
1408                 }
1409                 let secp_ctx = Secp256k1::without_caps();
1410                 Ok(Self {
1411                         node_signature_1: secp_signature!(&secp_ctx, &v[0..64]),
1412                         node_signature_2: secp_signature!(&secp_ctx, &v[64..128]),
1413                         bitcoin_signature_1: secp_signature!(&secp_ctx, &v[128..192]),
1414                         bitcoin_signature_2: secp_signature!(&secp_ctx, &v[192..256]),
1415                         contents: UnsignedChannelAnnouncement::decode(&v[256..])?,
1416                 })
1417         }
1418 }
1419 impl MsgEncodable for ChannelAnnouncement {
1420         fn encode(&self) -> Vec<u8> {
1421                 let secp_ctx = Secp256k1::without_caps();
1422                 let contents = self.contents.encode();
1423                 let mut res = Vec::with_capacity(64 + contents.len());
1424                 res.extend_from_slice(&self.node_signature_1.serialize_compact(&secp_ctx));
1425                 res.extend_from_slice(&self.node_signature_2.serialize_compact(&secp_ctx));
1426                 res.extend_from_slice(&self.bitcoin_signature_1.serialize_compact(&secp_ctx));
1427                 res.extend_from_slice(&self.bitcoin_signature_2.serialize_compact(&secp_ctx));
1428                 res.extend_from_slice(&contents);
1429                 res
1430         }
1431 }
1432
1433 impl MsgDecodable for UnsignedChannelUpdate {
1434         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1435                 if v.len() < 32+8+4+2+2+8+4+4 {
1436                         return Err(DecodeError::ShortRead);
1437                 }
1438                 let mut excess_data = Vec::with_capacity(v.len() - 64);
1439                 excess_data.extend_from_slice(&v[64..]);
1440                 Ok(Self {
1441                         chain_hash: deserialize(&v[0..32]).unwrap(),
1442                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1443                         timestamp: byte_utils::slice_to_be32(&v[40..44]),
1444                         flags: byte_utils::slice_to_be16(&v[44..46]),
1445                         cltv_expiry_delta: byte_utils::slice_to_be16(&v[46..48]),
1446                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[48..56]),
1447                         fee_base_msat: byte_utils::slice_to_be32(&v[56..60]),
1448                         fee_proportional_millionths: byte_utils::slice_to_be32(&v[60..64]),
1449                         excess_data
1450                 })
1451         }
1452 }
1453 impl MsgEncodable for UnsignedChannelUpdate {
1454         fn encode(&self) -> Vec<u8> {
1455                 let mut res = Vec::with_capacity(64 + self.excess_data.len());
1456                 res.extend_from_slice(&self.chain_hash[..]);
1457                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1458                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1459                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags));
1460                 res.extend_from_slice(&byte_utils::be16_to_array(self.cltv_expiry_delta));
1461                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
1462                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_base_msat));
1463                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_proportional_millionths));
1464                 res.extend_from_slice(&self.excess_data[..]);
1465                 res
1466         }
1467 }
1468
1469 impl MsgDecodable for ChannelUpdate {
1470         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1471                 if v.len() < 128 {
1472                         return Err(DecodeError::ShortRead);
1473                 }
1474                 let secp_ctx = Secp256k1::without_caps();
1475                 Ok(Self {
1476                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1477                         contents: UnsignedChannelUpdate::decode(&v[64..])?,
1478                 })
1479         }
1480 }
1481 impl MsgEncodable for ChannelUpdate {
1482         fn encode(&self) -> Vec<u8> {
1483                 let mut res = Vec::with_capacity(128);
1484                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps())[..]);
1485                 res.extend_from_slice(&self.contents.encode()[..]);
1486                 res
1487         }
1488 }
1489
1490 impl MsgDecodable for OnionRealm0HopData {
1491         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1492                 if v.len() < 32 {
1493                         return Err(DecodeError::ShortRead);
1494                 }
1495                 Ok(OnionRealm0HopData {
1496                         short_channel_id: byte_utils::slice_to_be64(&v[0..8]),
1497                         amt_to_forward: byte_utils::slice_to_be64(&v[8..16]),
1498                         outgoing_cltv_value: byte_utils::slice_to_be32(&v[16..20]),
1499                 })
1500         }
1501 }
1502 impl MsgEncodable for OnionRealm0HopData {
1503         fn encode(&self) -> Vec<u8> {
1504                 let mut res = Vec::with_capacity(32);
1505                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1506                 res.extend_from_slice(&byte_utils::be64_to_array(self.amt_to_forward));
1507                 res.extend_from_slice(&byte_utils::be32_to_array(self.outgoing_cltv_value));
1508                 res.resize(32, 0);
1509                 res
1510         }
1511 }
1512
1513 impl MsgDecodable for OnionHopData {
1514         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1515                 if v.len() < 65 {
1516                         return Err(DecodeError::ShortRead);
1517                 }
1518                 let realm = v[0];
1519                 if realm != 0 {
1520                         return Err(DecodeError::UnknownRealmByte);
1521                 }
1522                 let mut hmac = [0; 32];
1523                 hmac[..].copy_from_slice(&v[33..65]);
1524                 Ok(OnionHopData {
1525                         realm: realm,
1526                         data: OnionRealm0HopData::decode(&v[1..33])?,
1527                         hmac: hmac,
1528                 })
1529         }
1530 }
1531 impl MsgEncodable for OnionHopData {
1532         fn encode(&self) -> Vec<u8> {
1533                 let mut res = Vec::with_capacity(65);
1534                 res.push(self.realm);
1535                 res.extend_from_slice(&self.data.encode()[..]);
1536                 res.extend_from_slice(&self.hmac);
1537                 res
1538         }
1539 }
1540
1541 impl MsgDecodable for OnionPacket {
1542         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1543                 if v.len() < 1+33+20*65+32 {
1544                         return Err(DecodeError::ShortRead);
1545                 }
1546                 let mut hop_data = [0; 20*65];
1547                 hop_data.copy_from_slice(&v[34..1334]);
1548                 let mut hmac = [0; 32];
1549                 hmac.copy_from_slice(&v[1334..1366]);
1550                 let secp_ctx = Secp256k1::without_caps();
1551                 Ok(Self {
1552                         version: v[0],
1553                         public_key: PublicKey::from_slice(&secp_ctx, &v[1..34]),
1554                         hop_data,
1555                         hmac,
1556                 })
1557         }
1558 }
1559 impl MsgEncodable for OnionPacket {
1560         fn encode(&self) -> Vec<u8> {
1561                 let mut res = Vec::with_capacity(1 + 33 + 20*65 + 32);
1562                 res.push(self.version);
1563                 match self.public_key {
1564                         Ok(pubkey) => res.extend_from_slice(&pubkey.serialize()),
1565                         Err(_) => res.extend_from_slice(&[0; 33]),
1566                 }
1567                 res.extend_from_slice(&self.hop_data);
1568                 res.extend_from_slice(&self.hmac);
1569                 res
1570         }
1571 }
1572
1573 impl MsgDecodable for DecodedOnionErrorPacket {
1574         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1575                 if v.len() < 32 + 4 {
1576                         return Err(DecodeError::ShortRead);
1577                 }
1578                 let failuremsg_len = byte_utils::slice_to_be16(&v[32..34]) as usize;
1579                 if v.len() < 32 + 4 + failuremsg_len {
1580                         return Err(DecodeError::ShortRead);
1581                 }
1582                 let padding_len = byte_utils::slice_to_be16(&v[34 + failuremsg_len..]) as usize;
1583                 if v.len() < 32 + 4 + failuremsg_len + padding_len {
1584                         return Err(DecodeError::ShortRead);
1585                 }
1586
1587                 let mut hmac = [0; 32];
1588                 hmac.copy_from_slice(&v[0..32]);
1589                 Ok(Self {
1590                         hmac,
1591                         failuremsg: v[34..34 + failuremsg_len].to_vec(),
1592                         pad: v[36 + failuremsg_len..36 + failuremsg_len + padding_len].to_vec(),
1593                 })
1594         }
1595 }
1596 impl MsgEncodable for DecodedOnionErrorPacket {
1597         fn encode(&self) -> Vec<u8> {
1598                 let mut res = Vec::with_capacity(32 + 4 + self.failuremsg.len() + self.pad.len());
1599                 res.extend_from_slice(&self.hmac);
1600                 res.extend_from_slice(&[((self.failuremsg.len() >> 8) & 0xff) as u8, (self.failuremsg.len() & 0xff) as u8]);
1601                 res.extend_from_slice(&self.failuremsg);
1602                 res.extend_from_slice(&[((self.pad.len() >> 8) & 0xff) as u8, (self.pad.len() & 0xff) as u8]);
1603                 res.extend_from_slice(&self.pad);
1604                 res
1605         }
1606 }
1607
1608 impl MsgDecodable for OnionErrorPacket {
1609         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1610                 if v.len() < 2 {
1611                         return Err(DecodeError::ShortRead);
1612                 }
1613                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
1614                 if v.len() < 2 + len {
1615                         return Err(DecodeError::ShortRead);
1616                 }
1617                 Ok(Self {
1618                         data: v[2..len+2].to_vec(),
1619                 })
1620         }
1621 }
1622 impl MsgEncodable for OnionErrorPacket {
1623         fn encode(&self) -> Vec<u8> {
1624                 let mut res = Vec::with_capacity(2 + self.data.len());
1625                 res.extend_from_slice(&byte_utils::be16_to_array(self.data.len() as u16));
1626                 res.extend_from_slice(&self.data);
1627                 res
1628         }
1629 }
1630
1631 impl MsgEncodable for ErrorMessage {
1632         fn encode(&self) -> Vec<u8> {
1633                 let mut res = Vec::with_capacity(34 + self.data.len());
1634                 res.extend_from_slice(&self.channel_id);
1635                 res.extend_from_slice(&byte_utils::be16_to_array(self.data.len() as u16));
1636                 res.extend_from_slice(&self.data.as_bytes());
1637                 res
1638         }
1639 }
1640 impl MsgDecodable for ErrorMessage {
1641         fn decode(v: &[u8]) -> Result<Self,DecodeError> {
1642                 if v.len() < 34 {
1643                         return Err(DecodeError::ShortRead);
1644                 }
1645                 // Unlike most messages, BOLT 1 requires we truncate our read if the value is out of range
1646                 let len = cmp::min(byte_utils::slice_to_be16(&v[32..34]) as usize, v.len() - 34);
1647                 let data = match String::from_utf8(v[34..34 + len].to_vec()) {
1648                         Ok(s) => s,
1649                         Err(_) => return Err(DecodeError::BadText),
1650                 };
1651                 let mut channel_id = [0; 32];
1652                 channel_id[..].copy_from_slice(&v[0..32]);
1653                 Ok(Self {
1654                         channel_id,
1655                         data,
1656                 })
1657         }
1658 }
1659
1660 #[cfg(test)]
1661 mod tests {
1662         use hex;
1663         use ln::msgs::MsgEncodable;
1664         use ln::msgs;
1665         use secp256k1::key::{PublicKey,SecretKey};
1666         use secp256k1::Secp256k1;
1667
1668         #[test]
1669         fn encoding_channel_reestablish_no_secret() {
1670                 let cr = msgs::ChannelReestablish {
1671                         channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
1672                         next_local_commitment_number: 3,
1673                         next_remote_commitment_number: 4,
1674                         data_loss_protect: None,
1675                 };
1676
1677                 let encoded_value = cr.encode();
1678                 assert_eq!(
1679                         encoded_value,
1680                         vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4]
1681                 );
1682         }
1683
1684         #[test]
1685         fn encoding_channel_reestablish_with_secret() {
1686                 let public_key = {
1687                         let secp_ctx = Secp256k1::new();
1688                         PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap())
1689                 };
1690
1691                 let cr = msgs::ChannelReestablish {
1692                         channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
1693                         next_local_commitment_number: 3,
1694                         next_remote_commitment_number: 4,
1695                         data_loss_protect: Some(msgs::DataLossProtect { your_last_per_commitment_secret: [9;32], my_current_per_commitment_point: public_key}),
1696                 };
1697
1698                 let encoded_value = cr.encode();
1699                 assert_eq!(
1700                         encoded_value,
1701                         vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 3, 27, 132, 197, 86, 123, 18, 100, 64, 153, 93, 62, 213, 170, 186, 5, 101, 215, 30, 24, 52, 96, 72, 25, 255, 156, 23, 245, 233, 213, 221, 7, 143]
1702                 );
1703         }
1704 }