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

   1 use secp256k1::key::PublicKey;
   2 use secp256k1::{Secp256k1, Signature};
   3 use bitcoin::util::uint::Uint256;
   4 use bitcoin::util::hash::Sha256dHash;
   5 use bitcoin::network::serialize::{deserialize,serialize};
   6 use bitcoin::blockdata::script::Script;
   7
   8 use std::error::Error;
   9 use std::fmt;
  10 use std::result::Result;
  11
  12 use util::{byte_utils, internal_traits, events};
  13
  14 pub trait MsgEncodable {
  15         fn encode(&self) -> Vec<u8>;
  16         #[inline]
  17         fn encoded_len(&self) -> usize { self.encode().len() }
  18 }
  19 #[derive(Debug)]
  20 pub enum DecodeError {
  21         /// Unknown realm byte in an OnionHopData packet
  22         UnknownRealmByte,
  23         /// Failed to decode a public key (ie it's invalid)
  24         BadPublicKey,
  25         /// Failed to decode a signature (ie it's invalid)
  26         BadSignature,
  27         /// Buffer not of right length (either too short or too long)
  28         WrongLength,
  29         /// node_announcement included more than one address of a given type!
  30         ExtraAddressesPerType,
  31 }
  32 pub trait MsgDecodable: Sized {
  33         fn decode(v: &[u8]) -> Result<Self, DecodeError>;
  34 }
  35
  36 /// Tracks localfeatures which are only in init messages
  37 #[derive(Clone, PartialEq)]
  38 pub struct LocalFeatures {
  39         flags: Vec<u8>,
  40 }
  41
  42 impl LocalFeatures {
  43         pub fn new() -> LocalFeatures {
  44                 LocalFeatures {
  45                         flags: Vec::new(),
  46                 }
  47         }
  48
  49         pub fn supports_data_loss_protect(&self) -> bool {
  50                 self.flags.len() > 0 && (self.flags[0] & 3) != 0
  51         }
  52         pub fn requires_data_loss_protect(&self) -> bool {
  53                 self.flags.len() > 0 && (self.flags[0] & 1) != 0
  54         }
  55
  56         pub fn supports_initial_routing_sync(&self) -> bool {
  57                 self.flags.len() > 0 && (self.flags[0] & (1 << 3)) != 0
  58         }
  59
  60         pub fn supports_upfront_shutdown_script(&self) -> bool {
  61                 self.flags.len() > 0 && (self.flags[0] & (3 << 4)) != 0
  62         }
  63         pub fn requires_upfront_shutdown_script(&self) -> bool {
  64                 self.flags.len() > 0 && (self.flags[0] & (1 << 4)) != 0
  65         }
  66
  67         pub fn requires_unknown_bits(&self) -> bool {
  68                 for (idx, &byte) in self.flags.iter().enumerate() {
  69                         if idx != 0 && (byte & 0x55) != 0 {
  70                                 return true;
  71                         } else if idx == 0 && (byte & 0x14) != 0 {
  72                                 return true;
  73                         }
  74                 }
  75                 return false;
  76         }
  77
  78         pub fn supports_unknown_bits(&self) -> bool {
  79                 for (idx, &byte) in self.flags.iter().enumerate() {
  80                         if idx != 0 && byte != 0 {
  81                                 return true;
  82                         } else if idx == 0 && (byte & 0xc4) != 0 {
  83                                 return true;
  84                         }
  85                 }
  86                 return false;
  87         }
  88 }
  89
  90 /// Tracks globalfeatures which are in init messages and routing announcements
  91 #[derive(Clone, PartialEq)]
  92 pub struct GlobalFeatures {
  93         flags: Vec<u8>,
  94 }
  95
  96 impl GlobalFeatures {
  97         pub fn new() -> GlobalFeatures {
  98                 GlobalFeatures {
  99                         flags: Vec::new(),
 100                 }
 101         }
 102
 103         pub fn requires_unknown_bits(&self) -> bool {
 104                 for &byte in self.flags.iter() {
 105                         if (byte & 0x55) != 0 {
 106                                 return true;
 107                         }
 108                 }
 109                 return false;
 110         }
 111
 112         pub fn supports_unknown_bits(&self) -> bool {
 113                 for &byte in self.flags.iter() {
 114                         if byte != 0 {
 115                                 return true;
 116                         }
 117                 }
 118                 return false;
 119         }
 120 }
 121
 122 pub struct Init {
 123         pub global_features: GlobalFeatures,
 124         pub local_features: LocalFeatures,
 125 }
 126
 127 pub struct OpenChannel {
 128         pub chain_hash: Sha256dHash,
 129         pub temporary_channel_id: Uint256,
 130         pub funding_satoshis: u64,
 131         pub push_msat: u64,
 132         pub dust_limit_satoshis: u64,
 133         pub max_htlc_value_in_flight_msat: u64,
 134         pub channel_reserve_satoshis: u64,
 135         pub htlc_minimum_msat: u64,
 136         pub feerate_per_kw: u32,
 137         pub to_self_delay: u16,
 138         pub max_accepted_htlcs: u16,
 139         pub funding_pubkey: PublicKey,
 140         pub revocation_basepoint: PublicKey,
 141         pub payment_basepoint: PublicKey,
 142         pub delayed_payment_basepoint: PublicKey,
 143         pub htlc_basepoint: PublicKey,
 144         pub first_per_commitment_point: PublicKey,
 145         pub channel_flags: u8,
 146         pub shutdown_scriptpubkey: Option<Script>,
 147 }
 148
 149 pub struct AcceptChannel {
 150         pub temporary_channel_id: Uint256,
 151         pub dust_limit_satoshis: u64,
 152         pub max_htlc_value_in_flight_msat: u64,
 153         pub channel_reserve_satoshis: u64,
 154         pub htlc_minimum_msat: u64,
 155         pub minimum_depth: u32,
 156         pub to_self_delay: u16,
 157         pub max_accepted_htlcs: u16,
 158         pub funding_pubkey: PublicKey,
 159         pub revocation_basepoint: PublicKey,
 160         pub payment_basepoint: PublicKey,
 161         pub delayed_payment_basepoint: PublicKey,
 162         pub htlc_basepoint: PublicKey,
 163         pub first_per_commitment_point: PublicKey,
 164         pub shutdown_scriptpubkey: Option<Script>,
 165 }
 166
 167 pub struct FundingCreated {
 168         pub temporary_channel_id: Uint256,
 169         pub funding_txid: Sha256dHash,
 170         pub funding_output_index: u16,
 171         pub signature: Signature,
 172 }
 173
 174 pub struct FundingSigned {
 175         pub channel_id: Uint256,
 176         pub signature: Signature,
 177 }
 178
 179 pub struct FundingLocked {
 180         pub channel_id: Uint256,
 181         pub next_per_commitment_point: PublicKey,
 182 }
 183
 184 pub struct Shutdown {
 185         pub channel_id: Uint256,
 186         pub scriptpubkey: Script,
 187 }
 188
 189 pub struct ClosingSigned {
 190         pub channel_id: Uint256,
 191         pub fee_satoshis: u64,
 192         pub signature: Signature,
 193 }
 194
 195 #[derive(Clone)]
 196 pub struct UpdateAddHTLC {
 197         pub channel_id: Uint256,
 198         pub htlc_id: u64,
 199         pub amount_msat: u64,
 200         pub payment_hash: [u8; 32],
 201         pub cltv_expiry: u32,
 202         pub onion_routing_packet: OnionPacket,
 203 }
 204
 205 #[derive(Clone)]
 206 pub struct UpdateFulfillHTLC {
 207         pub channel_id: Uint256,
 208         pub htlc_id: u64,
 209         pub payment_preimage: [u8; 32],
 210 }
 211
 212 #[derive(Clone)]
 213 pub struct UpdateFailHTLC {
 214         pub channel_id: Uint256,
 215         pub htlc_id: u64,
 216         pub reason: OnionErrorPacket,
 217 }
 218
 219 #[derive(Clone)]
 220 pub struct UpdateFailMalformedHTLC {
 221         pub channel_id: Uint256,
 222         pub htlc_id: u64,
 223         pub sha256_of_onion: [u8; 32],
 224         pub failure_code: u16,
 225 }
 226
 227 #[derive(Clone)]
 228 pub struct CommitmentSigned {
 229         pub channel_id: Uint256,
 230         pub signature: Signature,
 231         pub htlc_signatures: Vec<Signature>,
 232 }
 233
 234 pub struct RevokeAndACK {
 235         pub channel_id: Uint256,
 236         pub per_commitment_secret: [u8; 32],
 237         pub next_per_commitment_point: PublicKey,
 238 }
 239
 240 pub struct UpdateFee {
 241         pub channel_id: Uint256,
 242         pub feerate_per_kw: u32,
 243 }
 244
 245 pub struct ChannelReestablish {
 246         pub channel_id: Uint256,
 247         pub next_local_commitment_number: u64,
 248         pub next_remote_commitment_number: u64,
 249         pub your_last_per_commitment_secret: Option<[u8; 32]>,
 250         pub my_current_per_commitment_point: PublicKey,
 251 }
 252
 253 #[derive(Clone)]
 254 pub struct AnnouncementSignatures {
 255         pub channel_id: Uint256,
 256         pub short_channel_id: u64,
 257         pub node_signature: Signature,
 258         pub bitcoin_signature: Signature,
 259 }
 260
 261 #[derive(Clone)]
 262 pub enum NetAddress {
 263         IPv4 {
 264                 addr: [u8; 4],
 265                 port: u16,
 266         },
 267         IPv6 {
 268                 addr: [u8; 16],
 269                 port: u16,
 270         },
 271         OnionV2 {
 272                 addr: [u8; 10],
 273                 port: u16,
 274         },
 275         OnionV3 {
 276                 ed25519_pubkey: [u8; 32],
 277                 checksum: u16,
 278                 version: u8,
 279                 port: u16,
 280         },
 281 }
 282 impl NetAddress {
 283         fn get_id(&self) -> u8 {
 284                 match self {
 285                         &NetAddress::IPv4 {..} => { 1 },
 286                         &NetAddress::IPv6 {..} => { 2 },
 287                         &NetAddress::OnionV2 {..} => { 3 },
 288                         &NetAddress::OnionV3 {..} => { 4 },
 289                 }
 290         }
 291 }
 292
 293 pub struct UnsignedNodeAnnouncement {
 294         pub features: GlobalFeatures,
 295         pub timestamp: u32,
 296         pub node_id: PublicKey,
 297         pub rgb: [u8; 3],
 298         pub alias: [u8; 32],
 299         /// List of addresses on which this node is reachable. Note that you may only have up to one
 300         /// address of each type, if you have more, they may be silently discarded or we may panic!
 301         pub addresses: Vec<NetAddress>,
 302 }
 303 pub struct NodeAnnouncement {
 304         pub signature: Signature,
 305         pub contents: UnsignedNodeAnnouncement,
 306 }
 307
 308 #[derive(PartialEq, Clone)]
 309 pub struct UnsignedChannelAnnouncement {
 310         pub features: GlobalFeatures,
 311         pub chain_hash: Sha256dHash,
 312         pub short_channel_id: u64,
 313         pub node_id_1: PublicKey,
 314         pub node_id_2: PublicKey,
 315         pub bitcoin_key_1: PublicKey,
 316         pub bitcoin_key_2: PublicKey,
 317 }
 318 #[derive(PartialEq, Clone)]
 319 pub struct ChannelAnnouncement {
 320         pub node_signature_1: Signature,
 321         pub node_signature_2: Signature,
 322         pub bitcoin_signature_1: Signature,
 323         pub bitcoin_signature_2: Signature,
 324         pub contents: UnsignedChannelAnnouncement,
 325 }
 326
 327 #[derive(PartialEq, Clone)]
 328 pub struct UnsignedChannelUpdate {
 329         pub chain_hash: Sha256dHash,
 330         pub short_channel_id: u64,
 331         pub timestamp: u32,
 332         pub flags: u16,
 333         pub cltv_expiry_delta: u16,
 334         pub htlc_minimum_msat: u64,
 335         pub fee_base_msat: u32,
 336         pub fee_proportional_millionths: u32,
 337 }
 338 #[derive(PartialEq, Clone)]
 339 pub struct ChannelUpdate {
 340         pub signature: Signature,
 341         pub contents: UnsignedChannelUpdate,
 342 }
 343
 344 /// Used to put an error message in a HandleError
 345 pub enum ErrorAction {
 346         UpdateFailHTLC {
 347                 msg: UpdateFailHTLC
 348         },
 349         DisconnectPeer {},
 350 }
 351
 352 pub struct HandleError { //TODO: rename me
 353         pub err: &'static str,
 354         pub msg: Option<ErrorAction>, //TODO: Make this required and rename it
 355 }
 356
 357 /// A trait to describe an object which can receive channel messages. Messages MAY be called in
 358 /// paralell when they originate from different their_node_ids, however they MUST NOT be called in
 359 /// paralell when the two calls have the same their_node_id.
 360 pub trait ChannelMessageHandler : events::EventsProvider {
 361         //Channel init:
 362         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<AcceptChannel, HandleError>;
 363         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>;
 364         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated) -> Result<FundingSigned, HandleError>;
 365         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned) -> Result<(), HandleError>;
 366         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked) -> Result<Option<AnnouncementSignatures>, HandleError>;
 367
 368         // Channl close:
 369         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown) -> Result<(Option<Shutdown>, Option<ClosingSigned>), HandleError>;
 370         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned) -> Result<Option<ClosingSigned>, HandleError>;
 371
 372         // HTLC handling:
 373         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC) -> Result<(), HandleError>;
 374         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC) -> Result<(), HandleError>;
 375         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC) -> Result<(), HandleError>;
 376         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC) -> Result<(), HandleError>;
 377         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned) -> Result<RevokeAndACK, HandleError>;
 378         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK) -> Result<Option<(Vec<UpdateAddHTLC>, CommitmentSigned)>, HandleError>;
 379
 380         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee) -> Result<(), HandleError>;
 381
 382         // Channel-to-announce:
 383         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures) -> Result<(), HandleError>;
 384 }
 385
 386 pub trait RoutingMessageHandler {
 387         fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<(), HandleError>;
 388         /// Handle a channel_announcement message, returning true if it should be forwarded on, false
 389         /// or returning an Err otherwise.
 390         fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, HandleError>;
 391         fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<(), HandleError>;
 392 }
 393
 394 pub struct OnionRealm0HopData {
 395         pub short_channel_id: u64,
 396         pub amt_to_forward: u64,
 397         pub outgoing_cltv_value: u32,
 398         // 12 bytes of 0-padding
 399 }
 400
 401 pub struct OnionHopData {
 402         pub realm: u8,
 403         pub data: OnionRealm0HopData,
 404         pub hmac: [u8; 32],
 405 }
 406 unsafe impl internal_traits::NoDealloc for OnionHopData{}
 407
 408 #[derive(Clone)]
 409 pub struct OnionPacket {
 410         pub version: u8,
 411         pub public_key: PublicKey,
 412         pub hop_data: [u8; 20*65],
 413         pub hmac: [u8; 32],
 414 }
 415
 416 pub struct DecodedOnionErrorPacket {
 417         pub hmac: [u8; 32],
 418         pub failuremsg: Vec<u8>,
 419         pub pad: Vec<u8>,
 420 }
 421
 422 #[derive(Clone)]
 423 pub struct OnionErrorPacket {
 424         // This really should be a constant size slice, but the spec lets these things be up to 128KB?
 425         // (TODO) We limit it in decode to much lower...
 426         pub data: Vec<u8>,
 427 }
 428
 429 impl Error for DecodeError {
 430         fn description(&self) -> &str {
 431                 match *self {
 432                         DecodeError::UnknownRealmByte => "Unknown realm byte in Onion packet",
 433                         DecodeError::BadPublicKey => "Invalid public key in packet",
 434                         DecodeError::BadSignature => "Invalid signature in packet",
 435                         DecodeError::WrongLength => "Data was wrong length for packet",
 436                         DecodeError::ExtraAddressesPerType => "More than one address of a single type",
 437                 }
 438         }
 439 }
 440 impl fmt::Display for DecodeError {
 441         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 442                 f.write_str(self.description())
 443         }
 444 }
 445
 446 impl fmt::Debug for HandleError {
 447         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 448                 f.write_str(self.err)
 449         }
 450 }
 451
 452 macro_rules! secp_pubkey {
 453         ( $ctx: expr, $slice: expr ) => {
 454                 match PublicKey::from_slice($ctx, $slice) {
 455                         Ok(key) => key,
 456                         Err(_) => return Err(DecodeError::BadPublicKey)
 457                 }
 458         };
 459 }
 460
 461 macro_rules! secp_signature {
 462         ( $ctx: expr, $slice: expr ) => {
 463                 match Signature::from_compact($ctx, $slice) {
 464                         Ok(sig) => sig,
 465                         Err(_) => return Err(DecodeError::BadSignature)
 466                 }
 467         };
 468 }
 469
 470 impl MsgDecodable for LocalFeatures {
 471         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 472                 if v.len() < 3 { return Err(DecodeError::WrongLength); }
 473                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 474                 if v.len() < len + 2 { return Err(DecodeError::WrongLength); }
 475                 let mut flags = Vec::with_capacity(len);
 476                 flags.extend_from_slice(&v[2..2 + len]);
 477                 Ok(Self {
 478                         flags: flags
 479                 })
 480         }
 481 }
 482 impl MsgEncodable for LocalFeatures {
 483         fn encode(&self) -> Vec<u8> {
 484                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 485                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 486                 res.extend_from_slice(&self.flags[..]);
 487                 res
 488         }
 489         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 490 }
 491
 492 impl MsgDecodable for GlobalFeatures {
 493         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 494                 if v.len() < 3 { return Err(DecodeError::WrongLength); }
 495                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 496                 if v.len() < len + 2 { return Err(DecodeError::WrongLength); }
 497                 let mut flags = Vec::with_capacity(len);
 498                 flags.extend_from_slice(&v[2..2 + len]);
 499                 Ok(Self {
 500                         flags: flags
 501                 })
 502         }
 503 }
 504 impl MsgEncodable for GlobalFeatures {
 505         fn encode(&self) -> Vec<u8> {
 506                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 507                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 508                 res.extend_from_slice(&self.flags[..]);
 509                 res
 510         }
 511         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 512 }
 513
 514 impl MsgDecodable for Init {
 515         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 516                 let global_features = GlobalFeatures::decode(v)?;
 517                 if v.len() < global_features.flags.len() + 4 {
 518                         return Err(DecodeError::WrongLength);
 519                 }
 520                 let local_features = LocalFeatures::decode(&v[global_features.flags.len() + 2..])?;
 521                 Ok(Self {
 522                         global_features: global_features,
 523                         local_features: local_features,
 524                 })
 525         }
 526 }
 527 impl MsgEncodable for Init {
 528         fn encode(&self) -> Vec<u8> {
 529                 let mut res = Vec::with_capacity(self.global_features.flags.len() + self.local_features.flags.len());
 530                 res.extend_from_slice(&self.global_features.encode()[..]);
 531                 res.extend_from_slice(&self.local_features.encode()[..]);
 532                 res
 533         }
 534 }
 535
 536 impl MsgDecodable for OpenChannel {
 537         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 538                 if v.len() < 2*32+6*8+4+2*2+6*33+1 {
 539                         return Err(DecodeError::WrongLength);
 540                 }
 541                 let ctx = Secp256k1::without_caps();
 542
 543                 let mut shutdown_scriptpubkey = None;
 544                 if v.len() >= 321 {
 545                         let len = byte_utils::slice_to_be16(&v[319..321]) as usize;
 546                         if v.len() < 321+len {
 547                                 return Err(DecodeError::WrongLength);
 548                         }
 549                         shutdown_scriptpubkey = Some(Script::from(v[321..321+len].to_vec()));
 550                 } else if v.len() != 2*32+6*8+4+2*2+6*33+1 { // Message cant have 1 extra byte
 551                         return Err(DecodeError::WrongLength);
 552                 }
 553
 554                 Ok(OpenChannel {
 555                         chain_hash: deserialize(&v[0..32]).unwrap(),
 556                         temporary_channel_id: deserialize(&v[32..64]).unwrap(),
 557                         funding_satoshis: byte_utils::slice_to_be64(&v[64..72]),
 558                         push_msat: byte_utils::slice_to_be64(&v[72..80]),
 559                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[80..88]),
 560                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[88..96]),
 561                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[96..104]),
 562                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[104..112]),
 563                         feerate_per_kw: byte_utils::slice_to_be32(&v[112..116]),
 564                         to_self_delay: byte_utils::slice_to_be16(&v[116..118]),
 565                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[118..120]),
 566                         funding_pubkey: secp_pubkey!(&ctx, &v[120..153]),
 567                         revocation_basepoint: secp_pubkey!(&ctx, &v[153..186]),
 568                         payment_basepoint: secp_pubkey!(&ctx, &v[186..219]),
 569                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[219..252]),
 570                         htlc_basepoint: secp_pubkey!(&ctx, &v[252..285]),
 571                         first_per_commitment_point: secp_pubkey!(&ctx, &v[285..318]),
 572                         channel_flags: v[318],
 573                         shutdown_scriptpubkey: shutdown_scriptpubkey
 574                 })
 575         }
 576 }
 577 impl MsgEncodable for OpenChannel {
 578         fn encode(&self) -> Vec<u8> {
 579                 unimplemented!();
 580         }
 581 }
 582
 583 impl MsgDecodable for AcceptChannel {
 584         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 585                 if v.len() < 32+4*8+4+2*2+6*33 {
 586                         return Err(DecodeError::WrongLength);
 587                 }
 588                 let ctx = Secp256k1::without_caps();
 589
 590                 let mut shutdown_scriptpubkey = None;
 591                 if v.len() >= 272 {
 592                         let len = byte_utils::slice_to_be16(&v[270..272]) as usize;
 593                         if v.len() < 272+len {
 594                                 return Err(DecodeError::WrongLength);
 595                         }
 596                         shutdown_scriptpubkey = Some(Script::from(v[272..272+len].to_vec()));
 597                 } else if v.len() != 32+4*8+4+2*2+6*33 { // Message cant have 1 extra byte
 598                         return Err(DecodeError::WrongLength);
 599                 }
 600
 601                 Ok(Self {
 602                         temporary_channel_id: deserialize(&v[0..32]).unwrap(),
 603                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 604                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[40..48]),
 605                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[48..56]),
 606                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[56..64]),
 607                         minimum_depth: byte_utils::slice_to_be32(&v[64..68]),
 608                         to_self_delay: byte_utils::slice_to_be16(&v[68..70]),
 609                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[70..72]),
 610                         funding_pubkey: secp_pubkey!(&ctx, &v[72..105]),
 611                         revocation_basepoint: secp_pubkey!(&ctx, &v[105..138]),
 612                         payment_basepoint: secp_pubkey!(&ctx, &v[138..171]),
 613                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[171..204]),
 614                         htlc_basepoint: secp_pubkey!(&ctx, &v[204..237]),
 615                         first_per_commitment_point: secp_pubkey!(&ctx, &v[237..270]),
 616                         shutdown_scriptpubkey: shutdown_scriptpubkey
 617                 })
 618         }
 619 }
 620 impl MsgEncodable for AcceptChannel {
 621         fn encode(&self) -> Vec<u8> {
 622                 let mut res = match &self.shutdown_scriptpubkey {
 623                         &Some(ref script) => Vec::with_capacity(270 + 2 + script.len()),
 624                         &None => Vec::with_capacity(270),
 625                 };
 626                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap()[..]);
 627                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 628                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 629                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 630                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 631                 res.extend_from_slice(&byte_utils::be32_to_array(self.minimum_depth));
 632                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 633                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 634                 res.extend_from_slice(&self.funding_pubkey.serialize());
 635                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 636                 res.extend_from_slice(&self.payment_basepoint.serialize());
 637                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 638                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 639                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 640                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 641                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 642                         res.extend_from_slice(&script[..]);
 643                 }
 644                 res
 645         }
 646 }
 647
 648 impl MsgDecodable for FundingCreated {
 649         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 650                 if v.len() < 32+32+2+64 {
 651                         return Err(DecodeError::WrongLength);
 652                 }
 653                 let ctx = Secp256k1::without_caps();
 654                 Ok(Self {
 655                         temporary_channel_id: deserialize(&v[0..32]).unwrap(),
 656                         funding_txid: deserialize(&v[32..64]).unwrap(),
 657                         funding_output_index: byte_utils::slice_to_be16(&v[64..66]),
 658                         signature: secp_signature!(&ctx, &v[66..130]),
 659                 })
 660         }
 661 }
 662 impl MsgEncodable for FundingCreated {
 663         fn encode(&self) -> Vec<u8> {
 664                 let mut res = Vec::with_capacity(32+32+2+64);
 665                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap()[..]);
 666                 res.extend_from_slice(&serialize(&self.funding_txid).unwrap()[..]);
 667                 res.extend_from_slice(&byte_utils::be16_to_array(self.funding_output_index));
 668                 let secp_ctx = Secp256k1::without_caps();
 669                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 670                 res
 671         }
 672 }
 673
 674 impl MsgDecodable for FundingSigned {
 675         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 676                 if v.len() < 32+64 {
 677                         return Err(DecodeError::WrongLength);
 678                 }
 679                 let ctx = Secp256k1::without_caps();
 680                 Ok(Self {
 681                         channel_id: deserialize(&v[0..32]).unwrap(),
 682                         signature: secp_signature!(&ctx, &v[32..96]),
 683                 })
 684         }
 685 }
 686 impl MsgEncodable for FundingSigned {
 687         fn encode(&self) -> Vec<u8> {
 688                 unimplemented!();
 689         }
 690 }
 691
 692 impl MsgDecodable for FundingLocked {
 693         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 694                 if v.len() < 32+33 {
 695                         return Err(DecodeError::WrongLength);
 696                 }
 697                 let ctx = Secp256k1::without_caps();
 698                 Ok(Self {
 699                         channel_id: deserialize(&v[0..32]).unwrap(),
 700                         next_per_commitment_point: secp_pubkey!(&ctx, &v[32..65]),
 701                 })
 702         }
 703 }
 704 impl MsgEncodable for FundingLocked {
 705         fn encode(&self) -> Vec<u8> {
 706                 let mut res = Vec::with_capacity(32+33);
 707                 res.extend_from_slice(&serialize(&self.channel_id).unwrap());
 708                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
 709                 res
 710         }
 711 }
 712
 713 impl MsgDecodable for Shutdown {
 714         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 715                 if v.len() < 32 + 2 {
 716                         return Err(DecodeError::WrongLength);
 717                 }
 718                 let scriptlen = byte_utils::slice_to_be16(&v[32..34]) as usize;
 719                 if v.len() < 32 + 2 + scriptlen {
 720                         return Err(DecodeError::WrongLength);
 721                 }
 722                 Ok(Self {
 723                         channel_id: deserialize(&v[0..32]).unwrap(),
 724                         scriptpubkey: Script::from(v[34..34 + scriptlen].to_vec()),
 725                 })
 726         }
 727 }
 728 impl MsgEncodable for Shutdown {
 729         fn encode(&self) -> Vec<u8> {
 730                 unimplemented!();
 731         }
 732 }
 733
 734 impl MsgDecodable for ClosingSigned {
 735         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 736                 if v.len() < 32 + 8 + 64 {
 737                         return Err(DecodeError::WrongLength);
 738                 }
 739                 let secp_ctx = Secp256k1::without_caps();
 740                 Ok(Self {
 741                         channel_id: deserialize(&v[0..32]).unwrap(),
 742                         fee_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 743                         signature: secp_signature!(&secp_ctx, &v[40..104]),
 744                 })
 745         }
 746 }
 747 impl MsgEncodable for ClosingSigned {
 748         fn encode(&self) -> Vec<u8> {
 749                 unimplemented!();
 750         }
 751 }
 752
 753 impl MsgDecodable for UpdateAddHTLC {
 754         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 755                 if v.len() < 32+8+8+32+4+1+33+20*65+32 {
 756                         return Err(DecodeError::WrongLength);
 757                 }
 758                 let mut payment_hash = [0; 32];
 759                 payment_hash.copy_from_slice(&v[48..80]);
 760                 Ok(Self{
 761                         channel_id: deserialize(&v[0..32]).unwrap(),
 762                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 763                         amount_msat: byte_utils::slice_to_be64(&v[40..48]),
 764                         payment_hash,
 765                         cltv_expiry: byte_utils::slice_to_be32(&v[80..84]),
 766                         onion_routing_packet: OnionPacket::decode(&v[84..])?,
 767                 })
 768         }
 769 }
 770 impl MsgEncodable for UpdateAddHTLC {
 771         fn encode(&self) -> Vec<u8> {
 772                 unimplemented!();
 773         }
 774 }
 775
 776 impl MsgDecodable for UpdateFulfillHTLC {
 777         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 778                 if v.len() < 32+8+32 {
 779                         return Err(DecodeError::WrongLength);
 780                 }
 781                 let mut payment_preimage = [0; 32];
 782                 payment_preimage.copy_from_slice(&v[40..72]);
 783                 Ok(Self{
 784                         channel_id: deserialize(&v[0..32]).unwrap(),
 785                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 786                         payment_preimage,
 787                 })
 788         }
 789 }
 790 impl MsgEncodable for UpdateFulfillHTLC {
 791         fn encode(&self) -> Vec<u8> {
 792                 unimplemented!();
 793         }
 794 }
 795
 796 impl MsgDecodable for UpdateFailHTLC {
 797         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 798                 if v.len() < 32+8 {
 799                         return Err(DecodeError::WrongLength);
 800                 }
 801                 Ok(Self{
 802                         channel_id: deserialize(&v[0..32]).unwrap(),
 803                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 804                         reason: OnionErrorPacket::decode(&v[40..])?,
 805                 })
 806         }
 807 }
 808 impl MsgEncodable for UpdateFailHTLC {
 809         fn encode(&self) -> Vec<u8> {
 810                 unimplemented!();
 811         }
 812 }
 813
 814 impl MsgDecodable for UpdateFailMalformedHTLC {
 815         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 816                 if v.len() < 32+8+32+2 {
 817                         return Err(DecodeError::WrongLength);
 818                 }
 819                 let mut sha256_of_onion = [0; 32];
 820                 sha256_of_onion.copy_from_slice(&v[40..72]);
 821                 Ok(Self{
 822                         channel_id: deserialize(&v[0..32]).unwrap(),
 823                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 824                         sha256_of_onion,
 825                         failure_code: byte_utils::slice_to_be16(&v[72..74]),
 826                 })
 827         }
 828 }
 829 impl MsgEncodable for UpdateFailMalformedHTLC {
 830         fn encode(&self) -> Vec<u8> {
 831                 unimplemented!();
 832         }
 833 }
 834
 835 impl MsgDecodable for CommitmentSigned {
 836         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 837                 if v.len() < 32+64+2 {
 838                         return Err(DecodeError::WrongLength);
 839                 }
 840                 let htlcs = byte_utils::slice_to_be16(&v[96..98]) as usize;
 841                 if v.len() < 32+64+2+htlcs*64 {
 842                         return Err(DecodeError::WrongLength);
 843                 }
 844                 let mut htlc_signatures = Vec::with_capacity(htlcs);
 845                 let secp_ctx = Secp256k1::without_caps();
 846                 for i in 0..htlcs {
 847                         htlc_signatures.push(secp_signature!(&secp_ctx, &v[98+i*64..98+(i+1)*64]));
 848                 }
 849                 Ok(Self {
 850                         channel_id: deserialize(&v[0..32]).unwrap(),
 851                         signature: secp_signature!(&secp_ctx, &v[32..96]),
 852                         htlc_signatures,
 853                 })
 854         }
 855 }
 856 impl MsgEncodable for CommitmentSigned {
 857         fn encode(&self) -> Vec<u8> {
 858                 unimplemented!();
 859         }
 860 }
 861
 862 impl MsgDecodable for RevokeAndACK {
 863         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 864                 if v.len() < 32+32+33 {
 865                         return Err(DecodeError::WrongLength);
 866                 }
 867                 let mut per_commitment_secret = [0; 32];
 868                 per_commitment_secret.copy_from_slice(&v[32..64]);
 869                 let secp_ctx = Secp256k1::without_caps();
 870                 Ok(Self {
 871                         channel_id: deserialize(&v[0..32]).unwrap(),
 872                         per_commitment_secret,
 873                         next_per_commitment_point: secp_pubkey!(&secp_ctx, &v[64..97]),
 874                 })
 875         }
 876 }
 877 impl MsgEncodable for RevokeAndACK {
 878         fn encode(&self) -> Vec<u8> {
 879                 unimplemented!();
 880         }
 881 }
 882
 883 impl MsgDecodable for UpdateFee {
 884         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 885                 if v.len() < 32+4 {
 886                         return Err(DecodeError::WrongLength);
 887                 }
 888                 Ok(Self {
 889                         channel_id: deserialize(&v[0..32]).unwrap(),
 890                         feerate_per_kw: byte_utils::slice_to_be32(&v[32..36]),
 891                 })
 892         }
 893 }
 894 impl MsgEncodable for UpdateFee {
 895         fn encode(&self) -> Vec<u8> {
 896                 unimplemented!();
 897         }
 898 }
 899
 900 impl MsgDecodable for ChannelReestablish {
 901         fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
 902                 unimplemented!();
 903         }
 904 }
 905 impl MsgEncodable for ChannelReestablish {
 906         fn encode(&self) -> Vec<u8> {
 907                 unimplemented!();
 908         }
 909 }
 910
 911 impl MsgDecodable for AnnouncementSignatures {
 912         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 913                 if v.len() < 32+8+64*2 {
 914                         return Err(DecodeError::WrongLength);
 915                 }
 916                 let secp_ctx = Secp256k1::without_caps();
 917                 Ok(Self {
 918                         channel_id: deserialize(&v[0..32]).unwrap(),
 919                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
 920                         node_signature: secp_signature!(&secp_ctx, &v[40..104]),
 921                         bitcoin_signature: secp_signature!(&secp_ctx, &v[104..168]),
 922                 })
 923         }
 924 }
 925 impl MsgEncodable for AnnouncementSignatures {
 926         fn encode(&self) -> Vec<u8> {
 927                 let mut res = Vec::with_capacity(32+8+64*2);
 928                 res.extend_from_slice(&serialize(&self.channel_id).unwrap());
 929                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
 930                 let secp_ctx = Secp256k1::without_caps();
 931                 res.extend_from_slice(&self.node_signature.serialize_compact(&secp_ctx));
 932                 res.extend_from_slice(&self.bitcoin_signature.serialize_compact(&secp_ctx));
 933                 res
 934         }
 935 }
 936
 937 impl MsgDecodable for UnsignedNodeAnnouncement {
 938         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 939                 let features = GlobalFeatures::decode(&v[..])?;
 940                 if v.len() < features.encoded_len() + 4 + 33 + 3 + 32 + 2 {
 941                         return Err(DecodeError::WrongLength);
 942                 }
 943                 let start = features.encoded_len();
 944
 945                 let mut rgb = [0; 3];
 946                 rgb.copy_from_slice(&v[start + 37..start + 40]);
 947
 948                 let mut alias = [0; 32];
 949                 alias.copy_from_slice(&v[start + 40..start + 72]);
 950
 951                 let addrlen = byte_utils::slice_to_be16(&v[start + 72..start + 74]) as usize;
 952                 if v.len() < start + 74 + addrlen {
 953                         return Err(DecodeError::WrongLength);
 954                 }
 955
 956                 let mut addresses = Vec::with_capacity(4);
 957                 let mut read_pos = start + 74;
 958                 loop {
 959                         if v.len() <= read_pos { break; }
 960                         match v[read_pos] {
 961                                 0 => { read_pos += 1; },
 962                                 1 => {
 963                                         if v.len() < read_pos + 1 + 6 {
 964                                                 return Err(DecodeError::WrongLength);
 965                                         }
 966                                         if addresses.len() > 0 {
 967                                                 return Err(DecodeError::ExtraAddressesPerType);
 968                                         }
 969                                         let mut addr = [0; 4];
 970                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 5]);
 971                                         addresses.push(NetAddress::IPv4 {
 972                                                 addr,
 973                                                 port: byte_utils::slice_to_be16(&v[read_pos + 5..read_pos + 7]),
 974                                         });
 975                                         read_pos += 1 + 6;
 976                                 },
 977                                 2 => {
 978                                         if v.len() < read_pos + 1 + 18 {
 979                                                 return Err(DecodeError::WrongLength);
 980                                         }
 981                                         if addresses.len() > 1 || (addresses.len() == 1 && addresses[0].get_id() != 1) {
 982                                                 return Err(DecodeError::ExtraAddressesPerType);
 983                                         }
 984                                         let mut addr = [0; 16];
 985                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 17]);
 986                                         addresses.push(NetAddress::IPv6 {
 987                                                 addr,
 988                                                 port: byte_utils::slice_to_be16(&v[read_pos + 17..read_pos + 19]),
 989                                         });
 990                                         read_pos += 1 + 18;
 991                                 },
 992                                 3 => {
 993                                         if v.len() < read_pos + 1 + 12 {
 994                                                 return Err(DecodeError::WrongLength);
 995                                         }
 996                                         if addresses.len() > 2 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 2) {
 997                                                 return Err(DecodeError::ExtraAddressesPerType);
 998                                         }
 999                                         let mut addr = [0; 10];
1000                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 11]);
1001                                         addresses.push(NetAddress::OnionV2 {
1002                                                 addr,
1003                                                 port: byte_utils::slice_to_be16(&v[read_pos + 11..read_pos + 13]),
1004                                         });
1005                                         read_pos += 1 + 12;
1006                                 },
1007                                 4 => {
1008                                         if v.len() < read_pos + 1 + 37 {
1009                                                 return Err(DecodeError::WrongLength);
1010                                         }
1011                                         if addresses.len() > 3 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 3) {
1012                                                 return Err(DecodeError::ExtraAddressesPerType);
1013                                         }
1014                                         let mut ed25519_pubkey = [0; 32];
1015                                         ed25519_pubkey.copy_from_slice(&v[read_pos + 1..read_pos + 33]);
1016                                         addresses.push(NetAddress::OnionV3 {
1017                                                 ed25519_pubkey,
1018                                                 checksum: byte_utils::slice_to_be16(&v[read_pos + 33..read_pos + 35]),
1019                                                 version: v[read_pos + 35],
1020                                                 port: byte_utils::slice_to_be16(&v[read_pos + 36..read_pos + 38]),
1021                                         });
1022                                         read_pos += 1 + 37;
1023                                 },
1024                                 _ => { break; } // We've read all we can, we dont understand anything higher (and they're sorted)
1025                         }
1026                 }
1027
1028                 let secp_ctx = Secp256k1::without_caps();
1029                 Ok(Self {
1030                         features,
1031                         timestamp: byte_utils::slice_to_be32(&v[start..start + 4]),
1032                         node_id: secp_pubkey!(&secp_ctx, &v[start + 4..start + 37]),
1033                         rgb,
1034                         alias,
1035                         addresses,
1036                 })
1037         }
1038 }
1039 impl MsgEncodable for UnsignedNodeAnnouncement {
1040         fn encode(&self) -> Vec<u8> {
1041                 let features = self.features.encode();
1042                 let mut res = Vec::with_capacity(74 + features.len() + self.addresses.len());
1043                 res.extend_from_slice(&features[..]);
1044                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1045                 res.extend_from_slice(&self.node_id.serialize());
1046                 res.extend_from_slice(&self.rgb);
1047                 res.extend_from_slice(&self.alias);
1048                 let mut addr_slice = Vec::with_capacity(self.addresses.len() * 18);
1049                 let mut addrs_to_encode = self.addresses.clone();
1050                 addrs_to_encode.sort_unstable_by(|a, b| { a.get_id().cmp(&b.get_id()) });
1051                 addrs_to_encode.dedup_by(|a, b| { a.get_id() == b.get_id() });
1052                 for addr in addrs_to_encode.iter() {
1053                         match addr {
1054                                 &NetAddress::IPv4{addr, port} => {
1055                                         addr_slice.push(1);
1056                                         addr_slice.extend_from_slice(&addr);
1057                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1058                                 },
1059                                 &NetAddress::IPv6{addr, port} => {
1060                                         addr_slice.push(2);
1061                                         addr_slice.extend_from_slice(&addr);
1062                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1063                                 },
1064                                 &NetAddress::OnionV2{addr, port} => {
1065                                         addr_slice.push(3);
1066                                         addr_slice.extend_from_slice(&addr);
1067                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1068                                 },
1069                                 &NetAddress::OnionV3{ed25519_pubkey, checksum, version, port} => {
1070                                         addr_slice.push(4);
1071                                         addr_slice.extend_from_slice(&ed25519_pubkey);
1072                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(checksum));
1073                                         addr_slice.push(version);
1074                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1075                                 },
1076                         }
1077                 }
1078                 res.extend_from_slice(&byte_utils::be16_to_array(addr_slice.len() as u16));
1079                 res.extend_from_slice(&addr_slice[..]);
1080                 res
1081         }
1082 }
1083
1084 impl MsgDecodable for NodeAnnouncement {
1085         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1086                 if v.len() < 64 {
1087                         return Err(DecodeError::WrongLength);
1088                 }
1089                 let secp_ctx = Secp256k1::without_caps();
1090                 Ok(Self {
1091                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1092                         contents: UnsignedNodeAnnouncement::decode(&v[64..])?,
1093                 })
1094         }
1095 }
1096 impl MsgEncodable for NodeAnnouncement {
1097         fn encode(&self) -> Vec<u8> {
1098                 unimplemented!();
1099         }
1100 }
1101
1102 impl MsgDecodable for UnsignedChannelAnnouncement {
1103         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1104                 let features = GlobalFeatures::decode(&v[..])?;
1105                 if v.len() < features.encoded_len() + 32 + 8 + 33*4 {
1106                         return Err(DecodeError::WrongLength);
1107                 }
1108                 let start = features.encoded_len();
1109                 let secp_ctx = Secp256k1::without_caps();
1110                 Ok(Self {
1111                         features,
1112                         chain_hash: deserialize(&v[start..start + 32]).unwrap(),
1113                         short_channel_id: byte_utils::slice_to_be64(&v[start + 32..start + 40]),
1114                         node_id_1: secp_pubkey!(&secp_ctx, &v[start + 40..start + 73]),
1115                         node_id_2: secp_pubkey!(&secp_ctx, &v[start + 73..start + 106]),
1116                         bitcoin_key_1: secp_pubkey!(&secp_ctx, &v[start + 106..start + 139]),
1117                         bitcoin_key_2: secp_pubkey!(&secp_ctx, &v[start + 139..start + 172]),
1118                 })
1119         }
1120 }
1121 impl MsgEncodable for UnsignedChannelAnnouncement {
1122         fn encode(&self) -> Vec<u8> {
1123                 let features = self.features.encode();
1124                 let mut res = Vec::with_capacity(172 + features.len());
1125                 res.extend_from_slice(&features[..]);
1126                 res.extend_from_slice(&self.chain_hash[..]);
1127                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1128                 res.extend_from_slice(&self.node_id_1.serialize());
1129                 res.extend_from_slice(&self.node_id_2.serialize());
1130                 res.extend_from_slice(&self.bitcoin_key_1.serialize());
1131                 res.extend_from_slice(&self.bitcoin_key_2.serialize());
1132                 res
1133         }
1134 }
1135
1136 impl MsgDecodable for ChannelAnnouncement {
1137         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1138                 if v.len() < 64*4 {
1139                         return Err(DecodeError::WrongLength);
1140                 }
1141                 let secp_ctx = Secp256k1::without_caps();
1142                 Ok(Self {
1143                         node_signature_1: secp_signature!(&secp_ctx, &v[0..64]),
1144                         node_signature_2: secp_signature!(&secp_ctx, &v[64..128]),
1145                         bitcoin_signature_1: secp_signature!(&secp_ctx, &v[128..192]),
1146                         bitcoin_signature_2: secp_signature!(&secp_ctx, &v[192..256]),
1147                         contents: UnsignedChannelAnnouncement::decode(&v[256..])?,
1148                 })
1149         }
1150 }
1151 impl MsgEncodable for ChannelAnnouncement {
1152         fn encode(&self) -> Vec<u8> {
1153                 unimplemented!();
1154         }
1155 }
1156
1157 impl MsgDecodable for UnsignedChannelUpdate {
1158         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1159                 if v.len() < 32+8+4+2+2+8+4+4 {
1160                         return Err(DecodeError::WrongLength);
1161                 }
1162                 Ok(Self {
1163                         chain_hash: deserialize(&v[0..32]).unwrap(),
1164                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1165                         timestamp: byte_utils::slice_to_be32(&v[40..44]),
1166                         flags: byte_utils::slice_to_be16(&v[44..46]),
1167                         cltv_expiry_delta: byte_utils::slice_to_be16(&v[46..48]),
1168                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[48..56]),
1169                         fee_base_msat: byte_utils::slice_to_be32(&v[56..60]),
1170                         fee_proportional_millionths: byte_utils::slice_to_be32(&v[60..64]),
1171                 })
1172         }
1173 }
1174 impl MsgEncodable for UnsignedChannelUpdate {
1175         fn encode(&self) -> Vec<u8> {
1176                 let mut res = Vec::with_capacity(64);
1177                 res.extend_from_slice(&self.chain_hash[..]);
1178                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1179                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1180                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags));
1181                 res.extend_from_slice(&byte_utils::be16_to_array(self.cltv_expiry_delta));
1182                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
1183                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_base_msat));
1184                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_proportional_millionths));
1185                 res
1186         }
1187 }
1188
1189 impl MsgDecodable for ChannelUpdate {
1190         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1191                 if v.len() < 128 {
1192                         return Err(DecodeError::WrongLength);
1193                 }
1194                 let secp_ctx = Secp256k1::without_caps();
1195                 Ok(Self {
1196                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1197                         contents: UnsignedChannelUpdate::decode(&v[64..])?,
1198                 })
1199         }
1200 }
1201 impl MsgEncodable for ChannelUpdate {
1202         fn encode(&self) -> Vec<u8> {
1203                 let mut res = Vec::with_capacity(128);
1204                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps())[..]);
1205                 res.extend_from_slice(&self.contents.encode()[..]);
1206                 res
1207         }
1208 }
1209
1210 impl MsgDecodable for OnionRealm0HopData {
1211         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1212                 if v.len() < 32 {
1213                         return Err(DecodeError::WrongLength);
1214                 }
1215                 Ok(OnionRealm0HopData {
1216                         short_channel_id: byte_utils::slice_to_be64(&v[0..8]),
1217                         amt_to_forward: byte_utils::slice_to_be64(&v[8..16]),
1218                         outgoing_cltv_value: byte_utils::slice_to_be32(&v[16..20]),
1219                 })
1220         }
1221 }
1222 impl MsgEncodable for OnionRealm0HopData {
1223         fn encode(&self) -> Vec<u8> {
1224                 let mut res = Vec::with_capacity(32);
1225                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1226                 res.extend_from_slice(&byte_utils::be64_to_array(self.amt_to_forward));
1227                 res.extend_from_slice(&byte_utils::be32_to_array(self.outgoing_cltv_value));
1228                 res.resize(32, 0);
1229                 res
1230         }
1231 }
1232
1233 impl MsgDecodable for OnionHopData {
1234         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1235                 if v.len() < 65 {
1236                         return Err(DecodeError::WrongLength);
1237                 }
1238                 let realm = v[0];
1239                 if realm != 0 {
1240                         return Err(DecodeError::UnknownRealmByte);
1241                 }
1242                 let mut hmac = [0; 32];
1243                 hmac[..].copy_from_slice(&v[33..65]);
1244                 Ok(OnionHopData {
1245                         realm: realm,
1246                         data: OnionRealm0HopData::decode(&v[1..33])?,
1247                         hmac: hmac,
1248                 })
1249         }
1250 }
1251 impl MsgEncodable for OnionHopData {
1252         fn encode(&self) -> Vec<u8> {
1253                 let mut res = Vec::with_capacity(65);
1254                 res.push(self.realm);
1255                 res.extend_from_slice(&self.data.encode()[..]);
1256                 res.extend_from_slice(&self.hmac);
1257                 res
1258         }
1259 }
1260
1261 impl MsgDecodable for OnionPacket {
1262         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1263                 if v.len() < 1+33+20*65+32 {
1264                         return Err(DecodeError::WrongLength);
1265                 }
1266                 let mut hop_data = [0; 20*65];
1267                 hop_data.copy_from_slice(&v[34..1334]);
1268                 let mut hmac = [0; 32];
1269                 hmac.copy_from_slice(&v[1334..1366]);
1270                 let secp_ctx = Secp256k1::without_caps();
1271                 Ok(Self {
1272                         version: v[0],
1273                         public_key: secp_pubkey!(&secp_ctx, &v[1..34]),
1274                         hop_data,
1275                         hmac,
1276                 })
1277         }
1278 }
1279 impl MsgEncodable for OnionPacket {
1280         fn encode(&self) -> Vec<u8> {
1281                 let mut res = Vec::with_capacity(1 + 33 + 20*65 + 32);
1282                 res.push(self.version);
1283                 res.extend_from_slice(&self.public_key.serialize());
1284                 res.extend_from_slice(&self.hop_data);
1285                 res.extend_from_slice(&self.hmac);
1286                 res
1287         }
1288 }
1289
1290 impl MsgDecodable for DecodedOnionErrorPacket {
1291         fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
1292                 unimplemented!();
1293         }
1294 }
1295 impl MsgEncodable for DecodedOnionErrorPacket {
1296         fn encode(&self) -> Vec<u8> {
1297                 let mut res = Vec::with_capacity(32 + 4 + self.failuremsg.len() + self.pad.len());
1298                 res.extend_from_slice(&self.hmac);
1299                 res.extend_from_slice(&[((self.failuremsg.len() >> 8) & 0xff) as u8, (self.failuremsg.len() & 0xff) as u8]);
1300                 res.extend_from_slice(&self.failuremsg);
1301                 res.extend_from_slice(&[((self.pad.len() >> 8) & 0xff) as u8, (self.pad.len() & 0xff) as u8]);
1302                 res.extend_from_slice(&self.pad);
1303                 res
1304         }
1305 }
1306
1307 impl MsgDecodable for OnionErrorPacket {
1308         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1309                 if v.len() < 2 {
1310                         return Err(DecodeError::WrongLength);
1311                 }
1312                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
1313                 if v.len() < 2 + len {
1314                         return Err(DecodeError::WrongLength);
1315                 }
1316                 Ok(Self {
1317                         data: v[2..len+2].to_vec(),
1318                 })
1319         }
1320 }
1321 impl MsgEncodable for OnionErrorPacket {
1322         fn encode(&self) -> Vec<u8> {
1323                 unimplemented!();
1324         }
1325 }
1326