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