_ 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         #[inline]
  19         fn encode_with_len(&self) -> Vec<u8> {
  20                 let enc = self.encode();
  21                 let mut res = Vec::with_capacity(enc.len() + 2);
  22                 res.extend_from_slice(&byte_utils::be16_to_array(enc.len() as u16));
  23                 res.extend_from_slice(&enc);
  24                 res
  25         }
  26 }
  27 #[derive(Debug)]
  28 pub enum DecodeError {
  29         /// Unknown realm byte in an OnionHopData packet
  30         UnknownRealmByte,
  31         /// Failed to decode a public key (ie it's invalid)
  32         BadPublicKey,
  33         /// Failed to decode a signature (ie it's invalid)
  34         BadSignature,
  35         /// Buffer not of right length (either too short or too long)
  36         WrongLength,
  37         /// node_announcement included more than one address of a given type!
  38         ExtraAddressesPerType,
  39 }
  40 pub trait MsgDecodable: Sized {
  41         fn decode(v: &[u8]) -> Result<Self, DecodeError>;
  42 }
  43
  44 /// Tracks localfeatures which are only in init messages
  45 #[derive(Clone, PartialEq)]
  46 pub struct LocalFeatures {
  47         flags: Vec<u8>,
  48 }
  49
  50 impl LocalFeatures {
  51         pub fn new() -> LocalFeatures {
  52                 LocalFeatures {
  53                         flags: Vec::new(),
  54                 }
  55         }
  56
  57         pub fn supports_data_loss_protect(&self) -> bool {
  58                 self.flags.len() > 0 && (self.flags[0] & 3) != 0
  59         }
  60         pub fn requires_data_loss_protect(&self) -> bool {
  61                 self.flags.len() > 0 && (self.flags[0] & 1) != 0
  62         }
  63
  64         pub fn supports_initial_routing_sync(&self) -> bool {
  65                 self.flags.len() > 0 && (self.flags[0] & (1 << 3)) != 0
  66         }
  67
  68         pub fn supports_upfront_shutdown_script(&self) -> bool {
  69                 self.flags.len() > 0 && (self.flags[0] & (3 << 4)) != 0
  70         }
  71         pub fn requires_upfront_shutdown_script(&self) -> bool {
  72                 self.flags.len() > 0 && (self.flags[0] & (1 << 4)) != 0
  73         }
  74
  75         pub fn requires_unknown_bits(&self) -> bool {
  76                 for (idx, &byte) in self.flags.iter().enumerate() {
  77                         if idx != 0 && (byte & 0x55) != 0 {
  78                                 return true;
  79                         } else if idx == 0 && (byte & 0x14) != 0 {
  80                                 return true;
  81                         }
  82                 }
  83                 return false;
  84         }
  85
  86         pub fn supports_unknown_bits(&self) -> bool {
  87                 for (idx, &byte) in self.flags.iter().enumerate() {
  88                         if idx != 0 && byte != 0 {
  89                                 return true;
  90                         } else if idx == 0 && (byte & 0xc4) != 0 {
  91                                 return true;
  92                         }
  93                 }
  94                 return false;
  95         }
  96 }
  97
  98 /// Tracks globalfeatures which are in init messages and routing announcements
  99 #[derive(Clone, PartialEq)]
 100 pub struct GlobalFeatures {
 101         flags: Vec<u8>,
 102 }
 103
 104 impl GlobalFeatures {
 105         pub fn new() -> GlobalFeatures {
 106                 GlobalFeatures {
 107                         flags: Vec::new(),
 108                 }
 109         }
 110
 111         pub fn requires_unknown_bits(&self) -> bool {
 112                 for &byte in self.flags.iter() {
 113                         if (byte & 0x55) != 0 {
 114                                 return true;
 115                         }
 116                 }
 117                 return false;
 118         }
 119
 120         pub fn supports_unknown_bits(&self) -> bool {
 121                 for &byte in self.flags.iter() {
 122                         if byte != 0 {
 123                                 return true;
 124                         }
 125                 }
 126                 return false;
 127         }
 128 }
 129
 130 pub struct Init {
 131         pub global_features: GlobalFeatures,
 132         pub local_features: LocalFeatures,
 133 }
 134
 135 pub struct OpenChannel {
 136         pub chain_hash: Sha256dHash,
 137         pub temporary_channel_id: Uint256,
 138         pub funding_satoshis: u64,
 139         pub push_msat: u64,
 140         pub dust_limit_satoshis: u64,
 141         pub max_htlc_value_in_flight_msat: u64,
 142         pub channel_reserve_satoshis: u64,
 143         pub htlc_minimum_msat: u64,
 144         pub feerate_per_kw: u32,
 145         pub to_self_delay: u16,
 146         pub max_accepted_htlcs: u16,
 147         pub funding_pubkey: PublicKey,
 148         pub revocation_basepoint: PublicKey,
 149         pub payment_basepoint: PublicKey,
 150         pub delayed_payment_basepoint: PublicKey,
 151         pub htlc_basepoint: PublicKey,
 152         pub first_per_commitment_point: PublicKey,
 153         pub channel_flags: u8,
 154         pub shutdown_scriptpubkey: Option<Script>,
 155 }
 156
 157 pub struct AcceptChannel {
 158         pub temporary_channel_id: Uint256,
 159         pub dust_limit_satoshis: u64,
 160         pub max_htlc_value_in_flight_msat: u64,
 161         pub channel_reserve_satoshis: u64,
 162         pub htlc_minimum_msat: u64,
 163         pub minimum_depth: u32,
 164         pub to_self_delay: u16,
 165         pub max_accepted_htlcs: u16,
 166         pub funding_pubkey: PublicKey,
 167         pub revocation_basepoint: PublicKey,
 168         pub payment_basepoint: PublicKey,
 169         pub delayed_payment_basepoint: PublicKey,
 170         pub htlc_basepoint: PublicKey,
 171         pub first_per_commitment_point: PublicKey,
 172         pub shutdown_scriptpubkey: Option<Script>,
 173 }
 174
 175 pub struct FundingCreated {
 176         pub temporary_channel_id: Uint256,
 177         pub funding_txid: Sha256dHash,
 178         pub funding_output_index: u16,
 179         pub signature: Signature,
 180 }
 181
 182 pub struct FundingSigned {
 183         pub channel_id: Uint256,
 184         pub signature: Signature,
 185 }
 186
 187 pub struct FundingLocked {
 188         pub channel_id: Uint256,
 189         pub next_per_commitment_point: PublicKey,
 190 }
 191
 192 pub struct Shutdown {
 193         pub channel_id: Uint256,
 194         pub scriptpubkey: Script,
 195 }
 196
 197 pub struct ClosingSigned {
 198         pub channel_id: Uint256,
 199         pub fee_satoshis: u64,
 200         pub signature: Signature,
 201 }
 202
 203 #[derive(Clone)]
 204 pub struct UpdateAddHTLC {
 205         pub channel_id: Uint256,
 206         pub htlc_id: u64,
 207         pub amount_msat: u64,
 208         pub payment_hash: [u8; 32],
 209         pub cltv_expiry: u32,
 210         pub onion_routing_packet: OnionPacket,
 211 }
 212
 213 #[derive(Clone)]
 214 pub struct UpdateFulfillHTLC {
 215         pub channel_id: Uint256,
 216         pub htlc_id: u64,
 217         pub payment_preimage: [u8; 32],
 218 }
 219
 220 #[derive(Clone)]
 221 pub struct UpdateFailHTLC {
 222         pub channel_id: Uint256,
 223         pub htlc_id: u64,
 224         pub reason: OnionErrorPacket,
 225 }
 226
 227 #[derive(Clone)]
 228 pub struct UpdateFailMalformedHTLC {
 229         pub channel_id: Uint256,
 230         pub htlc_id: u64,
 231         pub sha256_of_onion: [u8; 32],
 232         pub failure_code: u16,
 233 }
 234
 235 #[derive(Clone)]
 236 pub struct CommitmentSigned {
 237         pub channel_id: Uint256,
 238         pub signature: Signature,
 239         pub htlc_signatures: Vec<Signature>,
 240 }
 241
 242 pub struct RevokeAndACK {
 243         pub channel_id: Uint256,
 244         pub per_commitment_secret: [u8; 32],
 245         pub next_per_commitment_point: PublicKey,
 246 }
 247
 248 pub struct UpdateFee {
 249         pub channel_id: Uint256,
 250         pub feerate_per_kw: u32,
 251 }
 252
 253 pub struct ChannelReestablish {
 254         pub channel_id: Uint256,
 255         pub next_local_commitment_number: u64,
 256         pub next_remote_commitment_number: u64,
 257         pub your_last_per_commitment_secret: Option<[u8; 32]>,
 258         pub my_current_per_commitment_point: PublicKey,
 259 }
 260
 261 #[derive(Clone)]
 262 pub struct AnnouncementSignatures {
 263         pub channel_id: Uint256,
 264         pub short_channel_id: u64,
 265         pub node_signature: Signature,
 266         pub bitcoin_signature: Signature,
 267 }
 268
 269 #[derive(Clone)]
 270 pub enum NetAddress {
 271         IPv4 {
 272                 addr: [u8; 4],
 273                 port: u16,
 274         },
 275         IPv6 {
 276                 addr: [u8; 16],
 277                 port: u16,
 278         },
 279         OnionV2 {
 280                 addr: [u8; 10],
 281                 port: u16,
 282         },
 283         OnionV3 {
 284                 ed25519_pubkey: [u8; 32],
 285                 checksum: u16,
 286                 version: u8,
 287                 port: u16,
 288         },
 289 }
 290 impl NetAddress {
 291         fn get_id(&self) -> u8 {
 292                 match self {
 293                         &NetAddress::IPv4 {..} => { 1 },
 294                         &NetAddress::IPv6 {..} => { 2 },
 295                         &NetAddress::OnionV2 {..} => { 3 },
 296                         &NetAddress::OnionV3 {..} => { 4 },
 297                 }
 298         }
 299 }
 300
 301 pub struct UnsignedNodeAnnouncement {
 302         pub features: GlobalFeatures,
 303         pub timestamp: u32,
 304         pub node_id: PublicKey,
 305         pub rgb: [u8; 3],
 306         pub alias: [u8; 32],
 307         /// List of addresses on which this node is reachable. Note that you may only have up to one
 308         /// address of each type, if you have more, they may be silently discarded or we may panic!
 309         pub addresses: Vec<NetAddress>,
 310 }
 311 pub struct NodeAnnouncement {
 312         pub signature: Signature,
 313         pub contents: UnsignedNodeAnnouncement,
 314 }
 315
 316 #[derive(PartialEq, Clone)]
 317 pub struct UnsignedChannelAnnouncement {
 318         pub features: GlobalFeatures,
 319         pub chain_hash: Sha256dHash,
 320         pub short_channel_id: u64,
 321         pub node_id_1: PublicKey,
 322         pub node_id_2: PublicKey,
 323         pub bitcoin_key_1: PublicKey,
 324         pub bitcoin_key_2: PublicKey,
 325 }
 326 #[derive(PartialEq, Clone)]
 327 pub struct ChannelAnnouncement {
 328         pub node_signature_1: Signature,
 329         pub node_signature_2: Signature,
 330         pub bitcoin_signature_1: Signature,
 331         pub bitcoin_signature_2: Signature,
 332         pub contents: UnsignedChannelAnnouncement,
 333 }
 334
 335 #[derive(PartialEq, Clone)]
 336 pub struct UnsignedChannelUpdate {
 337         pub chain_hash: Sha256dHash,
 338         pub short_channel_id: u64,
 339         pub timestamp: u32,
 340         pub flags: u16,
 341         pub cltv_expiry_delta: u16,
 342         pub htlc_minimum_msat: u64,
 343         pub fee_base_msat: u32,
 344         pub fee_proportional_millionths: u32,
 345 }
 346 #[derive(PartialEq, Clone)]
 347 pub struct ChannelUpdate {
 348         pub signature: Signature,
 349         pub contents: UnsignedChannelUpdate,
 350 }
 351
 352 /// Used to put an error message in a HandleError
 353 pub enum ErrorAction {
 354         /// Indicates an inbound HTLC add resulted in a failure, and the UpdateFailHTLC provided in msg
 355         /// should be sent back to the sender.
 356         UpdateFailHTLC {
 357                 msg: UpdateFailHTLC
 358         },
 359         /// The peer took some action which made us think they were useless. Disconnect them.
 360         DisconnectPeer {},
 361 }
 362
 363 pub struct HandleError { //TODO: rename me
 364         pub err: &'static str,
 365         pub msg: Option<ErrorAction>, //TODO: Make this required and rename it
 366 }
 367
 368 /// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
 369 /// transaction updates if they were pending.
 370 pub struct CommitmentUpdate {
 371         pub update_add_htlcs: Vec<UpdateAddHTLC>,
 372         pub update_fulfill_htlcs: Vec<UpdateFulfillHTLC>,
 373         pub update_fail_htlcs: Vec<UpdateFailHTLC>,
 374         pub commitment_signed: CommitmentSigned,
 375 }
 376
 377 pub enum HTLCFailChannelUpdate {
 378         ChannelUpdateMessage {
 379                 msg: ChannelUpdate,
 380         },
 381         ChannelClosed {
 382                 short_channel_id: u64,
 383         },
 384 }
 385
 386 /// A trait to describe an object which can receive channel messages. Messages MAY be called in
 387 /// paralell when they originate from different their_node_ids, however they MUST NOT be called in
 388 /// paralell when the two calls have the same their_node_id.
 389 pub trait ChannelMessageHandler : events::EventsProvider {
 390         //Channel init:
 391         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<AcceptChannel, HandleError>;
 392         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>;
 393         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated) -> Result<FundingSigned, HandleError>;
 394         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned) -> Result<(), HandleError>;
 395         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked) -> Result<Option<AnnouncementSignatures>, HandleError>;
 396
 397         // Channl close:
 398         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown) -> Result<(Option<Shutdown>, Option<ClosingSigned>), HandleError>;
 399         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned) -> Result<Option<ClosingSigned>, HandleError>;
 400
 401         // HTLC handling:
 402         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC) -> Result<(), HandleError>;
 403         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC) -> Result<(), HandleError>;
 404         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC) -> Result<Option<HTLCFailChannelUpdate>, HandleError>;
 405         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC) -> Result<(), HandleError>;
 406         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned) -> Result<(RevokeAndACK, Option<CommitmentSigned>), HandleError>;
 407         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK) -> Result<Option<CommitmentUpdate>, HandleError>;
 408
 409         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee) -> Result<(), HandleError>;
 410
 411         // Channel-to-announce:
 412         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures) -> Result<(), HandleError>;
 413
 414         // Informational:
 415         /// Indicates a connection to the peer failed/an existing connection was lost. If no connection
 416         /// is believed to be possible in the future (eg they're sending us messages we don't
 417         /// understand or indicate they require unknown feature bits), no_connection_possible is set
 418         /// and any outstanding channels should be failed.
 419         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
 420 }
 421
 422 pub trait RoutingMessageHandler {
 423         fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<(), HandleError>;
 424         /// Handle a channel_announcement message, returning true if it should be forwarded on, false
 425         /// or returning an Err otherwise.
 426         fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, HandleError>;
 427         fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<(), HandleError>;
 428         fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
 429 }
 430
 431 pub struct OnionRealm0HopData {
 432         pub short_channel_id: u64,
 433         pub amt_to_forward: u64,
 434         pub outgoing_cltv_value: u32,
 435         // 12 bytes of 0-padding
 436 }
 437
 438 pub struct OnionHopData {
 439         pub realm: u8,
 440         pub data: OnionRealm0HopData,
 441         pub hmac: [u8; 32],
 442 }
 443 unsafe impl internal_traits::NoDealloc for OnionHopData{}
 444
 445 #[derive(Clone)]
 446 pub struct OnionPacket {
 447         pub version: u8,
 448         pub public_key: PublicKey,
 449         pub hop_data: [u8; 20*65],
 450         pub hmac: [u8; 32],
 451 }
 452
 453 pub struct DecodedOnionErrorPacket {
 454         pub hmac: [u8; 32],
 455         pub failuremsg: Vec<u8>,
 456         pub pad: Vec<u8>,
 457 }
 458
 459 #[derive(Clone)]
 460 pub struct OnionErrorPacket {
 461         // This really should be a constant size slice, but the spec lets these things be up to 128KB?
 462         // (TODO) We limit it in decode to much lower...
 463         pub data: Vec<u8>,
 464 }
 465
 466 impl Error for DecodeError {
 467         fn description(&self) -> &str {
 468                 match *self {
 469                         DecodeError::UnknownRealmByte => "Unknown realm byte in Onion packet",
 470                         DecodeError::BadPublicKey => "Invalid public key in packet",
 471                         DecodeError::BadSignature => "Invalid signature in packet",
 472                         DecodeError::WrongLength => "Data was wrong length for packet",
 473                         DecodeError::ExtraAddressesPerType => "More than one address of a single type",
 474                 }
 475         }
 476 }
 477 impl fmt::Display for DecodeError {
 478         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 479                 f.write_str(self.description())
 480         }
 481 }
 482
 483 impl fmt::Debug for HandleError {
 484         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 485                 f.write_str(self.err)
 486         }
 487 }
 488
 489 macro_rules! secp_pubkey {
 490         ( $ctx: expr, $slice: expr ) => {
 491                 match PublicKey::from_slice($ctx, $slice) {
 492                         Ok(key) => key,
 493                         Err(_) => return Err(DecodeError::BadPublicKey)
 494                 }
 495         };
 496 }
 497
 498 macro_rules! secp_signature {
 499         ( $ctx: expr, $slice: expr ) => {
 500                 match Signature::from_compact($ctx, $slice) {
 501                         Ok(sig) => sig,
 502                         Err(_) => return Err(DecodeError::BadSignature)
 503                 }
 504         };
 505 }
 506
 507 impl MsgDecodable for LocalFeatures {
 508         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 509                 if v.len() < 3 { return Err(DecodeError::WrongLength); }
 510                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 511                 if v.len() < len + 2 { return Err(DecodeError::WrongLength); }
 512                 let mut flags = Vec::with_capacity(len);
 513                 flags.extend_from_slice(&v[2..2 + len]);
 514                 Ok(Self {
 515                         flags: flags
 516                 })
 517         }
 518 }
 519 impl MsgEncodable for LocalFeatures {
 520         fn encode(&self) -> Vec<u8> {
 521                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 522                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 523                 res.extend_from_slice(&self.flags[..]);
 524                 res
 525         }
 526         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 527 }
 528
 529 impl MsgDecodable for GlobalFeatures {
 530         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 531                 if v.len() < 3 { return Err(DecodeError::WrongLength); }
 532                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 533                 if v.len() < len + 2 { return Err(DecodeError::WrongLength); }
 534                 let mut flags = Vec::with_capacity(len);
 535                 flags.extend_from_slice(&v[2..2 + len]);
 536                 Ok(Self {
 537                         flags: flags
 538                 })
 539         }
 540 }
 541 impl MsgEncodable for GlobalFeatures {
 542         fn encode(&self) -> Vec<u8> {
 543                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 544                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 545                 res.extend_from_slice(&self.flags[..]);
 546                 res
 547         }
 548         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 549 }
 550
 551 impl MsgDecodable for Init {
 552         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 553                 let global_features = GlobalFeatures::decode(v)?;
 554                 if v.len() < global_features.flags.len() + 4 {
 555                         return Err(DecodeError::WrongLength);
 556                 }
 557                 let local_features = LocalFeatures::decode(&v[global_features.flags.len() + 2..])?;
 558                 Ok(Self {
 559                         global_features: global_features,
 560                         local_features: local_features,
 561                 })
 562         }
 563 }
 564 impl MsgEncodable for Init {
 565         fn encode(&self) -> Vec<u8> {
 566                 let mut res = Vec::with_capacity(self.global_features.flags.len() + self.local_features.flags.len());
 567                 res.extend_from_slice(&self.global_features.encode()[..]);
 568                 res.extend_from_slice(&self.local_features.encode()[..]);
 569                 res
 570         }
 571 }
 572
 573 impl MsgDecodable for OpenChannel {
 574         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 575                 if v.len() < 2*32+6*8+4+2*2+6*33+1 {
 576                         return Err(DecodeError::WrongLength);
 577                 }
 578                 let ctx = Secp256k1::without_caps();
 579
 580                 let mut shutdown_scriptpubkey = None;
 581                 if v.len() >= 321 {
 582                         let len = byte_utils::slice_to_be16(&v[319..321]) as usize;
 583                         if v.len() < 321+len {
 584                                 return Err(DecodeError::WrongLength);
 585                         }
 586                         shutdown_scriptpubkey = Some(Script::from(v[321..321+len].to_vec()));
 587                 } else if v.len() != 2*32+6*8+4+2*2+6*33+1 { // Message cant have 1 extra byte
 588                         return Err(DecodeError::WrongLength);
 589                 }
 590
 591                 Ok(OpenChannel {
 592                         chain_hash: deserialize(&v[0..32]).unwrap(),
 593                         temporary_channel_id: deserialize(&v[32..64]).unwrap(),
 594                         funding_satoshis: byte_utils::slice_to_be64(&v[64..72]),
 595                         push_msat: byte_utils::slice_to_be64(&v[72..80]),
 596                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[80..88]),
 597                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[88..96]),
 598                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[96..104]),
 599                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[104..112]),
 600                         feerate_per_kw: byte_utils::slice_to_be32(&v[112..116]),
 601                         to_self_delay: byte_utils::slice_to_be16(&v[116..118]),
 602                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[118..120]),
 603                         funding_pubkey: secp_pubkey!(&ctx, &v[120..153]),
 604                         revocation_basepoint: secp_pubkey!(&ctx, &v[153..186]),
 605                         payment_basepoint: secp_pubkey!(&ctx, &v[186..219]),
 606                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[219..252]),
 607                         htlc_basepoint: secp_pubkey!(&ctx, &v[252..285]),
 608                         first_per_commitment_point: secp_pubkey!(&ctx, &v[285..318]),
 609                         channel_flags: v[318],
 610                         shutdown_scriptpubkey: shutdown_scriptpubkey
 611                 })
 612         }
 613 }
 614 impl MsgEncodable for OpenChannel {
 615         fn encode(&self) -> Vec<u8> {
 616                 unimplemented!();
 617         }
 618 }
 619
 620 impl MsgDecodable for AcceptChannel {
 621         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 622                 if v.len() < 32+4*8+4+2*2+6*33 {
 623                         return Err(DecodeError::WrongLength);
 624                 }
 625                 let ctx = Secp256k1::without_caps();
 626
 627                 let mut shutdown_scriptpubkey = None;
 628                 if v.len() >= 272 {
 629                         let len = byte_utils::slice_to_be16(&v[270..272]) as usize;
 630                         if v.len() < 272+len {
 631                                 return Err(DecodeError::WrongLength);
 632                         }
 633                         shutdown_scriptpubkey = Some(Script::from(v[272..272+len].to_vec()));
 634                 } else if v.len() != 32+4*8+4+2*2+6*33 { // Message cant have 1 extra byte
 635                         return Err(DecodeError::WrongLength);
 636                 }
 637
 638                 Ok(Self {
 639                         temporary_channel_id: deserialize(&v[0..32]).unwrap(),
 640                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 641                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[40..48]),
 642                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[48..56]),
 643                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[56..64]),
 644                         minimum_depth: byte_utils::slice_to_be32(&v[64..68]),
 645                         to_self_delay: byte_utils::slice_to_be16(&v[68..70]),
 646                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[70..72]),
 647                         funding_pubkey: secp_pubkey!(&ctx, &v[72..105]),
 648                         revocation_basepoint: secp_pubkey!(&ctx, &v[105..138]),
 649                         payment_basepoint: secp_pubkey!(&ctx, &v[138..171]),
 650                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[171..204]),
 651                         htlc_basepoint: secp_pubkey!(&ctx, &v[204..237]),
 652                         first_per_commitment_point: secp_pubkey!(&ctx, &v[237..270]),
 653                         shutdown_scriptpubkey: shutdown_scriptpubkey
 654                 })
 655         }
 656 }
 657 impl MsgEncodable for AcceptChannel {
 658         fn encode(&self) -> Vec<u8> {
 659                 let mut res = match &self.shutdown_scriptpubkey {
 660                         &Some(ref script) => Vec::with_capacity(270 + 2 + script.len()),
 661                         &None => Vec::with_capacity(270),
 662                 };
 663                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap()[..]);
 664                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 665                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 666                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 667                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 668                 res.extend_from_slice(&byte_utils::be32_to_array(self.minimum_depth));
 669                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 670                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 671                 res.extend_from_slice(&self.funding_pubkey.serialize());
 672                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 673                 res.extend_from_slice(&self.payment_basepoint.serialize());
 674                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 675                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 676                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 677                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 678                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 679                         res.extend_from_slice(&script[..]);
 680                 }
 681                 res
 682         }
 683 }
 684
 685 impl MsgDecodable for FundingCreated {
 686         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 687                 if v.len() < 32+32+2+64 {
 688                         return Err(DecodeError::WrongLength);
 689                 }
 690                 let ctx = Secp256k1::without_caps();
 691                 Ok(Self {
 692                         temporary_channel_id: deserialize(&v[0..32]).unwrap(),
 693                         funding_txid: deserialize(&v[32..64]).unwrap(),
 694                         funding_output_index: byte_utils::slice_to_be16(&v[64..66]),
 695                         signature: secp_signature!(&ctx, &v[66..130]),
 696                 })
 697         }
 698 }
 699 impl MsgEncodable for FundingCreated {
 700         fn encode(&self) -> Vec<u8> {
 701                 let mut res = Vec::with_capacity(32+32+2+64);
 702                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap()[..]);
 703                 res.extend_from_slice(&serialize(&self.funding_txid).unwrap()[..]);
 704                 res.extend_from_slice(&byte_utils::be16_to_array(self.funding_output_index));
 705                 let secp_ctx = Secp256k1::without_caps();
 706                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 707                 res
 708         }
 709 }
 710
 711 impl MsgDecodable for FundingSigned {
 712         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 713                 if v.len() < 32+64 {
 714                         return Err(DecodeError::WrongLength);
 715                 }
 716                 let ctx = Secp256k1::without_caps();
 717                 Ok(Self {
 718                         channel_id: deserialize(&v[0..32]).unwrap(),
 719                         signature: secp_signature!(&ctx, &v[32..96]),
 720                 })
 721         }
 722 }
 723 impl MsgEncodable for FundingSigned {
 724         fn encode(&self) -> Vec<u8> {
 725                 unimplemented!();
 726         }
 727 }
 728
 729 impl MsgDecodable for FundingLocked {
 730         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 731                 if v.len() < 32+33 {
 732                         return Err(DecodeError::WrongLength);
 733                 }
 734                 let ctx = Secp256k1::without_caps();
 735                 Ok(Self {
 736                         channel_id: deserialize(&v[0..32]).unwrap(),
 737                         next_per_commitment_point: secp_pubkey!(&ctx, &v[32..65]),
 738                 })
 739         }
 740 }
 741 impl MsgEncodable for FundingLocked {
 742         fn encode(&self) -> Vec<u8> {
 743                 let mut res = Vec::with_capacity(32+33);
 744                 res.extend_from_slice(&serialize(&self.channel_id).unwrap());
 745                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
 746                 res
 747         }
 748 }
 749
 750 impl MsgDecodable for Shutdown {
 751         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 752                 if v.len() < 32 + 2 {
 753                         return Err(DecodeError::WrongLength);
 754                 }
 755                 let scriptlen = byte_utils::slice_to_be16(&v[32..34]) as usize;
 756                 if v.len() < 32 + 2 + scriptlen {
 757                         return Err(DecodeError::WrongLength);
 758                 }
 759                 Ok(Self {
 760                         channel_id: deserialize(&v[0..32]).unwrap(),
 761                         scriptpubkey: Script::from(v[34..34 + scriptlen].to_vec()),
 762                 })
 763         }
 764 }
 765 impl MsgEncodable for Shutdown {
 766         fn encode(&self) -> Vec<u8> {
 767                 let mut res = Vec::with_capacity(32 + 2 + self.scriptpubkey.len());
 768                 res.extend_from_slice(&serialize(&self.channel_id).unwrap());
 769                 res.extend_from_slice(&byte_utils::be16_to_array(self.scriptpubkey.len() as u16));
 770                 res.extend_from_slice(&self.scriptpubkey[..]);
 771                 res
 772         }
 773 }
 774
 775 impl MsgDecodable for ClosingSigned {
 776         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 777                 if v.len() < 32 + 8 + 64 {
 778                         return Err(DecodeError::WrongLength);
 779                 }
 780                 let secp_ctx = Secp256k1::without_caps();
 781                 Ok(Self {
 782                         channel_id: deserialize(&v[0..32]).unwrap(),
 783                         fee_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 784                         signature: secp_signature!(&secp_ctx, &v[40..104]),
 785                 })
 786         }
 787 }
 788 impl MsgEncodable for ClosingSigned {
 789         fn encode(&self) -> Vec<u8> {
 790                 let mut res = Vec::with_capacity(32+8+64);
 791                 res.extend_from_slice(&serialize(&self.channel_id).unwrap());
 792                 res.extend_from_slice(&byte_utils::be64_to_array(self.fee_satoshis));
 793                 let secp_ctx = Secp256k1::without_caps();
 794                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 795                 res
 796         }
 797 }
 798
 799 impl MsgDecodable for UpdateAddHTLC {
 800         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 801                 if v.len() < 32+8+8+32+4+1+33+20*65+32 {
 802                         return Err(DecodeError::WrongLength);
 803                 }
 804                 let mut payment_hash = [0; 32];
 805                 payment_hash.copy_from_slice(&v[48..80]);
 806                 Ok(Self{
 807                         channel_id: deserialize(&v[0..32]).unwrap(),
 808                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 809                         amount_msat: byte_utils::slice_to_be64(&v[40..48]),
 810                         payment_hash,
 811                         cltv_expiry: byte_utils::slice_to_be32(&v[80..84]),
 812                         onion_routing_packet: OnionPacket::decode(&v[84..])?,
 813                 })
 814         }
 815 }
 816 impl MsgEncodable for UpdateAddHTLC {
 817         fn encode(&self) -> Vec<u8> {
 818                 unimplemented!();
 819         }
 820 }
 821
 822 impl MsgDecodable for UpdateFulfillHTLC {
 823         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 824                 if v.len() < 32+8+32 {
 825                         return Err(DecodeError::WrongLength);
 826                 }
 827                 let mut payment_preimage = [0; 32];
 828                 payment_preimage.copy_from_slice(&v[40..72]);
 829                 Ok(Self{
 830                         channel_id: deserialize(&v[0..32]).unwrap(),
 831                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 832                         payment_preimage,
 833                 })
 834         }
 835 }
 836 impl MsgEncodable for UpdateFulfillHTLC {
 837         fn encode(&self) -> Vec<u8> {
 838                 unimplemented!();
 839         }
 840 }
 841
 842 impl MsgDecodable for UpdateFailHTLC {
 843         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 844                 if v.len() < 32+8 {
 845                         return Err(DecodeError::WrongLength);
 846                 }
 847                 Ok(Self{
 848                         channel_id: deserialize(&v[0..32]).unwrap(),
 849                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 850                         reason: OnionErrorPacket::decode(&v[40..])?,
 851                 })
 852         }
 853 }
 854 impl MsgEncodable for UpdateFailHTLC {
 855         fn encode(&self) -> Vec<u8> {
 856                 unimplemented!();
 857         }
 858 }
 859
 860 impl MsgDecodable for UpdateFailMalformedHTLC {
 861         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 862                 if v.len() < 32+8+32+2 {
 863                         return Err(DecodeError::WrongLength);
 864                 }
 865                 let mut sha256_of_onion = [0; 32];
 866                 sha256_of_onion.copy_from_slice(&v[40..72]);
 867                 Ok(Self{
 868                         channel_id: deserialize(&v[0..32]).unwrap(),
 869                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 870                         sha256_of_onion,
 871                         failure_code: byte_utils::slice_to_be16(&v[72..74]),
 872                 })
 873         }
 874 }
 875 impl MsgEncodable for UpdateFailMalformedHTLC {
 876         fn encode(&self) -> Vec<u8> {
 877                 unimplemented!();
 878         }
 879 }
 880
 881 impl MsgDecodable for CommitmentSigned {
 882         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 883                 if v.len() < 32+64+2 {
 884                         return Err(DecodeError::WrongLength);
 885                 }
 886                 let htlcs = byte_utils::slice_to_be16(&v[96..98]) as usize;
 887                 if v.len() < 32+64+2+htlcs*64 {
 888                         return Err(DecodeError::WrongLength);
 889                 }
 890                 let mut htlc_signatures = Vec::with_capacity(htlcs);
 891                 let secp_ctx = Secp256k1::without_caps();
 892                 for i in 0..htlcs {
 893                         htlc_signatures.push(secp_signature!(&secp_ctx, &v[98+i*64..98+(i+1)*64]));
 894                 }
 895                 Ok(Self {
 896                         channel_id: deserialize(&v[0..32]).unwrap(),
 897                         signature: secp_signature!(&secp_ctx, &v[32..96]),
 898                         htlc_signatures,
 899                 })
 900         }
 901 }
 902 impl MsgEncodable for CommitmentSigned {
 903         fn encode(&self) -> Vec<u8> {
 904                 unimplemented!();
 905         }
 906 }
 907
 908 impl MsgDecodable for RevokeAndACK {
 909         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 910                 if v.len() < 32+32+33 {
 911                         return Err(DecodeError::WrongLength);
 912                 }
 913                 let mut per_commitment_secret = [0; 32];
 914                 per_commitment_secret.copy_from_slice(&v[32..64]);
 915                 let secp_ctx = Secp256k1::without_caps();
 916                 Ok(Self {
 917                         channel_id: deserialize(&v[0..32]).unwrap(),
 918                         per_commitment_secret,
 919                         next_per_commitment_point: secp_pubkey!(&secp_ctx, &v[64..97]),
 920                 })
 921         }
 922 }
 923 impl MsgEncodable for RevokeAndACK {
 924         fn encode(&self) -> Vec<u8> {
 925                 unimplemented!();
 926         }
 927 }
 928
 929 impl MsgDecodable for UpdateFee {
 930         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 931                 if v.len() < 32+4 {
 932                         return Err(DecodeError::WrongLength);
 933                 }
 934                 Ok(Self {
 935                         channel_id: deserialize(&v[0..32]).unwrap(),
 936                         feerate_per_kw: byte_utils::slice_to_be32(&v[32..36]),
 937                 })
 938         }
 939 }
 940 impl MsgEncodable for UpdateFee {
 941         fn encode(&self) -> Vec<u8> {
 942                 unimplemented!();
 943         }
 944 }
 945
 946 impl MsgDecodable for ChannelReestablish {
 947         fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
 948                 unimplemented!();
 949         }
 950 }
 951 impl MsgEncodable for ChannelReestablish {
 952         fn encode(&self) -> Vec<u8> {
 953                 unimplemented!();
 954         }
 955 }
 956
 957 impl MsgDecodable for AnnouncementSignatures {
 958         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 959                 if v.len() < 32+8+64*2 {
 960                         return Err(DecodeError::WrongLength);
 961                 }
 962                 let secp_ctx = Secp256k1::without_caps();
 963                 Ok(Self {
 964                         channel_id: deserialize(&v[0..32]).unwrap(),
 965                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
 966                         node_signature: secp_signature!(&secp_ctx, &v[40..104]),
 967                         bitcoin_signature: secp_signature!(&secp_ctx, &v[104..168]),
 968                 })
 969         }
 970 }
 971 impl MsgEncodable for AnnouncementSignatures {
 972         fn encode(&self) -> Vec<u8> {
 973                 let mut res = Vec::with_capacity(32+8+64*2);
 974                 res.extend_from_slice(&serialize(&self.channel_id).unwrap());
 975                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
 976                 let secp_ctx = Secp256k1::without_caps();
 977                 res.extend_from_slice(&self.node_signature.serialize_compact(&secp_ctx));
 978                 res.extend_from_slice(&self.bitcoin_signature.serialize_compact(&secp_ctx));
 979                 res
 980         }
 981 }
 982
 983 impl MsgDecodable for UnsignedNodeAnnouncement {
 984         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 985                 let features = GlobalFeatures::decode(&v[..])?;
 986                 if v.len() < features.encoded_len() + 4 + 33 + 3 + 32 + 2 {
 987                         return Err(DecodeError::WrongLength);
 988                 }
 989                 let start = features.encoded_len();
 990
 991                 let mut rgb = [0; 3];
 992                 rgb.copy_from_slice(&v[start + 37..start + 40]);
 993
 994                 let mut alias = [0; 32];
 995                 alias.copy_from_slice(&v[start + 40..start + 72]);
 996
 997                 let addrlen = byte_utils::slice_to_be16(&v[start + 72..start + 74]) as usize;
 998                 if v.len() < start + 74 + addrlen {
 999                         return Err(DecodeError::WrongLength);
1000                 }
1001
1002                 let mut addresses = Vec::with_capacity(4);
1003                 let mut read_pos = start + 74;
1004                 loop {
1005                         if v.len() <= read_pos { break; }
1006                         match v[read_pos] {
1007                                 0 => { read_pos += 1; },
1008                                 1 => {
1009                                         if v.len() < read_pos + 1 + 6 {
1010                                                 return Err(DecodeError::WrongLength);
1011                                         }
1012                                         if addresses.len() > 0 {
1013                                                 return Err(DecodeError::ExtraAddressesPerType);
1014                                         }
1015                                         let mut addr = [0; 4];
1016                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 5]);
1017                                         addresses.push(NetAddress::IPv4 {
1018                                                 addr,
1019                                                 port: byte_utils::slice_to_be16(&v[read_pos + 5..read_pos + 7]),
1020                                         });
1021                                         read_pos += 1 + 6;
1022                                 },
1023                                 2 => {
1024                                         if v.len() < read_pos + 1 + 18 {
1025                                                 return Err(DecodeError::WrongLength);
1026                                         }
1027                                         if addresses.len() > 1 || (addresses.len() == 1 && addresses[0].get_id() != 1) {
1028                                                 return Err(DecodeError::ExtraAddressesPerType);
1029                                         }
1030                                         let mut addr = [0; 16];
1031                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 17]);
1032                                         addresses.push(NetAddress::IPv6 {
1033                                                 addr,
1034                                                 port: byte_utils::slice_to_be16(&v[read_pos + 17..read_pos + 19]),
1035                                         });
1036                                         read_pos += 1 + 18;
1037                                 },
1038                                 3 => {
1039                                         if v.len() < read_pos + 1 + 12 {
1040                                                 return Err(DecodeError::WrongLength);
1041                                         }
1042                                         if addresses.len() > 2 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 2) {
1043                                                 return Err(DecodeError::ExtraAddressesPerType);
1044                                         }
1045                                         let mut addr = [0; 10];
1046                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 11]);
1047                                         addresses.push(NetAddress::OnionV2 {
1048                                                 addr,
1049                                                 port: byte_utils::slice_to_be16(&v[read_pos + 11..read_pos + 13]),
1050                                         });
1051                                         read_pos += 1 + 12;
1052                                 },
1053                                 4 => {
1054                                         if v.len() < read_pos + 1 + 37 {
1055                                                 return Err(DecodeError::WrongLength);
1056                                         }
1057                                         if addresses.len() > 3 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 3) {
1058                                                 return Err(DecodeError::ExtraAddressesPerType);
1059                                         }
1060                                         let mut ed25519_pubkey = [0; 32];
1061                                         ed25519_pubkey.copy_from_slice(&v[read_pos + 1..read_pos + 33]);
1062                                         addresses.push(NetAddress::OnionV3 {
1063                                                 ed25519_pubkey,
1064                                                 checksum: byte_utils::slice_to_be16(&v[read_pos + 33..read_pos + 35]),
1065                                                 version: v[read_pos + 35],
1066                                                 port: byte_utils::slice_to_be16(&v[read_pos + 36..read_pos + 38]),
1067                                         });
1068                                         read_pos += 1 + 37;
1069                                 },
1070                                 _ => { break; } // We've read all we can, we dont understand anything higher (and they're sorted)
1071                         }
1072                 }
1073
1074                 let secp_ctx = Secp256k1::without_caps();
1075                 Ok(Self {
1076                         features,
1077                         timestamp: byte_utils::slice_to_be32(&v[start..start + 4]),
1078                         node_id: secp_pubkey!(&secp_ctx, &v[start + 4..start + 37]),
1079                         rgb,
1080                         alias,
1081                         addresses,
1082                 })
1083         }
1084 }
1085 impl MsgEncodable for UnsignedNodeAnnouncement {
1086         fn encode(&self) -> Vec<u8> {
1087                 let features = self.features.encode();
1088                 let mut res = Vec::with_capacity(74 + features.len() + self.addresses.len());
1089                 res.extend_from_slice(&features[..]);
1090                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1091                 res.extend_from_slice(&self.node_id.serialize());
1092                 res.extend_from_slice(&self.rgb);
1093                 res.extend_from_slice(&self.alias);
1094                 let mut addr_slice = Vec::with_capacity(self.addresses.len() * 18);
1095                 let mut addrs_to_encode = self.addresses.clone();
1096                 addrs_to_encode.sort_unstable_by(|a, b| { a.get_id().cmp(&b.get_id()) });
1097                 addrs_to_encode.dedup_by(|a, b| { a.get_id() == b.get_id() });
1098                 for addr in addrs_to_encode.iter() {
1099                         match addr {
1100                                 &NetAddress::IPv4{addr, port} => {
1101                                         addr_slice.push(1);
1102                                         addr_slice.extend_from_slice(&addr);
1103                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1104                                 },
1105                                 &NetAddress::IPv6{addr, port} => {
1106                                         addr_slice.push(2);
1107                                         addr_slice.extend_from_slice(&addr);
1108                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1109                                 },
1110                                 &NetAddress::OnionV2{addr, port} => {
1111                                         addr_slice.push(3);
1112                                         addr_slice.extend_from_slice(&addr);
1113                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1114                                 },
1115                                 &NetAddress::OnionV3{ed25519_pubkey, checksum, version, port} => {
1116                                         addr_slice.push(4);
1117                                         addr_slice.extend_from_slice(&ed25519_pubkey);
1118                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(checksum));
1119                                         addr_slice.push(version);
1120                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1121                                 },
1122                         }
1123                 }
1124                 res.extend_from_slice(&byte_utils::be16_to_array(addr_slice.len() as u16));
1125                 res.extend_from_slice(&addr_slice[..]);
1126                 res
1127         }
1128 }
1129
1130 impl MsgDecodable for NodeAnnouncement {
1131         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1132                 if v.len() < 64 {
1133                         return Err(DecodeError::WrongLength);
1134                 }
1135                 let secp_ctx = Secp256k1::without_caps();
1136                 Ok(Self {
1137                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1138                         contents: UnsignedNodeAnnouncement::decode(&v[64..])?,
1139                 })
1140         }
1141 }
1142 impl MsgEncodable for NodeAnnouncement {
1143         fn encode(&self) -> Vec<u8> {
1144                 unimplemented!();
1145         }
1146 }
1147
1148 impl MsgDecodable for UnsignedChannelAnnouncement {
1149         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1150                 let features = GlobalFeatures::decode(&v[..])?;
1151                 if v.len() < features.encoded_len() + 32 + 8 + 33*4 {
1152                         return Err(DecodeError::WrongLength);
1153                 }
1154                 let start = features.encoded_len();
1155                 let secp_ctx = Secp256k1::without_caps();
1156                 Ok(Self {
1157                         features,
1158                         chain_hash: deserialize(&v[start..start + 32]).unwrap(),
1159                         short_channel_id: byte_utils::slice_to_be64(&v[start + 32..start + 40]),
1160                         node_id_1: secp_pubkey!(&secp_ctx, &v[start + 40..start + 73]),
1161                         node_id_2: secp_pubkey!(&secp_ctx, &v[start + 73..start + 106]),
1162                         bitcoin_key_1: secp_pubkey!(&secp_ctx, &v[start + 106..start + 139]),
1163                         bitcoin_key_2: secp_pubkey!(&secp_ctx, &v[start + 139..start + 172]),
1164                 })
1165         }
1166 }
1167 impl MsgEncodable for UnsignedChannelAnnouncement {
1168         fn encode(&self) -> Vec<u8> {
1169                 let features = self.features.encode();
1170                 let mut res = Vec::with_capacity(172 + features.len());
1171                 res.extend_from_slice(&features[..]);
1172                 res.extend_from_slice(&self.chain_hash[..]);
1173                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1174                 res.extend_from_slice(&self.node_id_1.serialize());
1175                 res.extend_from_slice(&self.node_id_2.serialize());
1176                 res.extend_from_slice(&self.bitcoin_key_1.serialize());
1177                 res.extend_from_slice(&self.bitcoin_key_2.serialize());
1178                 res
1179         }
1180 }
1181
1182 impl MsgDecodable for ChannelAnnouncement {
1183         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1184                 if v.len() < 64*4 {
1185                         return Err(DecodeError::WrongLength);
1186                 }
1187                 let secp_ctx = Secp256k1::without_caps();
1188                 Ok(Self {
1189                         node_signature_1: secp_signature!(&secp_ctx, &v[0..64]),
1190                         node_signature_2: secp_signature!(&secp_ctx, &v[64..128]),
1191                         bitcoin_signature_1: secp_signature!(&secp_ctx, &v[128..192]),
1192                         bitcoin_signature_2: secp_signature!(&secp_ctx, &v[192..256]),
1193                         contents: UnsignedChannelAnnouncement::decode(&v[256..])?,
1194                 })
1195         }
1196 }
1197 impl MsgEncodable for ChannelAnnouncement {
1198         fn encode(&self) -> Vec<u8> {
1199                 unimplemented!();
1200         }
1201 }
1202
1203 impl MsgDecodable for UnsignedChannelUpdate {
1204         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1205                 if v.len() < 32+8+4+2+2+8+4+4 {
1206                         return Err(DecodeError::WrongLength);
1207                 }
1208                 Ok(Self {
1209                         chain_hash: deserialize(&v[0..32]).unwrap(),
1210                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1211                         timestamp: byte_utils::slice_to_be32(&v[40..44]),
1212                         flags: byte_utils::slice_to_be16(&v[44..46]),
1213                         cltv_expiry_delta: byte_utils::slice_to_be16(&v[46..48]),
1214                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[48..56]),
1215                         fee_base_msat: byte_utils::slice_to_be32(&v[56..60]),
1216                         fee_proportional_millionths: byte_utils::slice_to_be32(&v[60..64]),
1217                 })
1218         }
1219 }
1220 impl MsgEncodable for UnsignedChannelUpdate {
1221         fn encode(&self) -> Vec<u8> {
1222                 let mut res = Vec::with_capacity(64);
1223                 res.extend_from_slice(&self.chain_hash[..]);
1224                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1225                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1226                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags));
1227                 res.extend_from_slice(&byte_utils::be16_to_array(self.cltv_expiry_delta));
1228                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
1229                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_base_msat));
1230                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_proportional_millionths));
1231                 res
1232         }
1233 }
1234
1235 impl MsgDecodable for ChannelUpdate {
1236         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1237                 if v.len() < 128 {
1238                         return Err(DecodeError::WrongLength);
1239                 }
1240                 let secp_ctx = Secp256k1::without_caps();
1241                 Ok(Self {
1242                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1243                         contents: UnsignedChannelUpdate::decode(&v[64..])?,
1244                 })
1245         }
1246 }
1247 impl MsgEncodable for ChannelUpdate {
1248         fn encode(&self) -> Vec<u8> {
1249                 let mut res = Vec::with_capacity(128);
1250                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps())[..]);
1251                 res.extend_from_slice(&self.contents.encode()[..]);
1252                 res
1253         }
1254 }
1255
1256 impl MsgDecodable for OnionRealm0HopData {
1257         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1258                 if v.len() < 32 {
1259                         return Err(DecodeError::WrongLength);
1260                 }
1261                 Ok(OnionRealm0HopData {
1262                         short_channel_id: byte_utils::slice_to_be64(&v[0..8]),
1263                         amt_to_forward: byte_utils::slice_to_be64(&v[8..16]),
1264                         outgoing_cltv_value: byte_utils::slice_to_be32(&v[16..20]),
1265                 })
1266         }
1267 }
1268 impl MsgEncodable for OnionRealm0HopData {
1269         fn encode(&self) -> Vec<u8> {
1270                 let mut res = Vec::with_capacity(32);
1271                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1272                 res.extend_from_slice(&byte_utils::be64_to_array(self.amt_to_forward));
1273                 res.extend_from_slice(&byte_utils::be32_to_array(self.outgoing_cltv_value));
1274                 res.resize(32, 0);
1275                 res
1276         }
1277 }
1278
1279 impl MsgDecodable for OnionHopData {
1280         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1281                 if v.len() < 65 {
1282                         return Err(DecodeError::WrongLength);
1283                 }
1284                 let realm = v[0];
1285                 if realm != 0 {
1286                         return Err(DecodeError::UnknownRealmByte);
1287                 }
1288                 let mut hmac = [0; 32];
1289                 hmac[..].copy_from_slice(&v[33..65]);
1290                 Ok(OnionHopData {
1291                         realm: realm,
1292                         data: OnionRealm0HopData::decode(&v[1..33])?,
1293                         hmac: hmac,
1294                 })
1295         }
1296 }
1297 impl MsgEncodable for OnionHopData {
1298         fn encode(&self) -> Vec<u8> {
1299                 let mut res = Vec::with_capacity(65);
1300                 res.push(self.realm);
1301                 res.extend_from_slice(&self.data.encode()[..]);
1302                 res.extend_from_slice(&self.hmac);
1303                 res
1304         }
1305 }
1306
1307 impl MsgDecodable for OnionPacket {
1308         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1309                 if v.len() < 1+33+20*65+32 {
1310                         return Err(DecodeError::WrongLength);
1311                 }
1312                 let mut hop_data = [0; 20*65];
1313                 hop_data.copy_from_slice(&v[34..1334]);
1314                 let mut hmac = [0; 32];
1315                 hmac.copy_from_slice(&v[1334..1366]);
1316                 let secp_ctx = Secp256k1::without_caps();
1317                 Ok(Self {
1318                         version: v[0],
1319                         public_key: secp_pubkey!(&secp_ctx, &v[1..34]),
1320                         hop_data,
1321                         hmac,
1322                 })
1323         }
1324 }
1325 impl MsgEncodable for OnionPacket {
1326         fn encode(&self) -> Vec<u8> {
1327                 let mut res = Vec::with_capacity(1 + 33 + 20*65 + 32);
1328                 res.push(self.version);
1329                 res.extend_from_slice(&self.public_key.serialize());
1330                 res.extend_from_slice(&self.hop_data);
1331                 res.extend_from_slice(&self.hmac);
1332                 res
1333         }
1334 }
1335
1336 impl MsgDecodable for DecodedOnionErrorPacket {
1337         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1338                 if v.len() < 32 + 4 {
1339                         return Err(DecodeError::WrongLength);
1340                 }
1341                 let failuremsg_len = byte_utils::slice_to_be16(&v[32..34]) as usize;
1342                 if v.len() < 32 + 4 + failuremsg_len {
1343                         return Err(DecodeError::WrongLength);
1344                 }
1345                 let padding_len = byte_utils::slice_to_be16(&v[34 + failuremsg_len..]) as usize;
1346                 if v.len() < 32 + 4 + failuremsg_len + padding_len {
1347                         return Err(DecodeError::WrongLength);
1348                 }
1349
1350                 let mut hmac = [0; 32];
1351                 hmac.copy_from_slice(&v[0..32]);
1352                 Ok(Self {
1353                         hmac,
1354                         failuremsg: v[34..34 + failuremsg_len].to_vec(),
1355                         pad: v[36 + failuremsg_len..36 + failuremsg_len + padding_len].to_vec(),
1356                 })
1357         }
1358 }
1359 impl MsgEncodable for DecodedOnionErrorPacket {
1360         fn encode(&self) -> Vec<u8> {
1361                 let mut res = Vec::with_capacity(32 + 4 + self.failuremsg.len() + self.pad.len());
1362                 res.extend_from_slice(&self.hmac);
1363                 res.extend_from_slice(&[((self.failuremsg.len() >> 8) & 0xff) as u8, (self.failuremsg.len() & 0xff) as u8]);
1364                 res.extend_from_slice(&self.failuremsg);
1365                 res.extend_from_slice(&[((self.pad.len() >> 8) & 0xff) as u8, (self.pad.len() & 0xff) as u8]);
1366                 res.extend_from_slice(&self.pad);
1367                 res
1368         }
1369 }
1370
1371 impl MsgDecodable for OnionErrorPacket {
1372         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1373                 if v.len() < 2 {
1374                         return Err(DecodeError::WrongLength);
1375                 }
1376                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
1377                 if v.len() < 2 + len {
1378                         return Err(DecodeError::WrongLength);
1379                 }
1380                 Ok(Self {
1381                         data: v[2..len+2].to_vec(),
1382                 })
1383         }
1384 }
1385 impl MsgEncodable for OnionErrorPacket {
1386         fn encode(&self) -> Vec<u8> {
1387                 unimplemented!();
1388         }
1389 }
1390