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