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

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