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