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