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

   1 use secp256k1::key::PublicKey;
   2 use secp256k1::{Secp256k1, Signature};
   3 use bitcoin::util::hash::Sha256dHash;
   4 use bitcoin::network::serialize::{deserialize,serialize};
   5 use bitcoin::blockdata::script::Script;
   6
   7 use std::error::Error;
   8 use std::{cmp, fmt};
   9 use std::result::Result;
  10
  11 use util::{byte_utils, internal_traits, events};
  12
  13 pub trait MsgEncodable {
  14         fn encode(&self) -> Vec<u8>;
  15         #[inline]
  16         fn encoded_len(&self) -> usize { self.encode().len() }
  17         #[inline]
  18         fn encode_with_len(&self) -> Vec<u8> {
  19                 let enc = self.encode();
  20                 let mut res = Vec::with_capacity(enc.len() + 2);
  21                 res.extend_from_slice(&byte_utils::be16_to_array(enc.len() as u16));
  22                 res.extend_from_slice(&enc);
  23                 res
  24         }
  25 }
  26 #[derive(Debug)]
  27 pub enum DecodeError {
  28         /// Unknown realm byte in an OnionHopData packet
  29         UnknownRealmByte,
  30         /// Failed to decode a public key (ie it's invalid)
  31         BadPublicKey,
  32         /// Failed to decode a signature (ie it's invalid)
  33         BadSignature,
  34         /// Value expected to be text wasn't decodable as text
  35         BadText,
  36         /// Buffer too short
  37         ShortRead,
  38         /// node_announcement included more than one address of a given type!
  39         ExtraAddressesPerType,
  40         /// A length descriptor in the packet didn't describe the later data correctly
  41         /// (currently only generated in node_announcement)
  42         BadLengthDescriptor,
  43 }
  44 pub trait MsgDecodable: Sized {
  45         fn decode(v: &[u8]) -> Result<Self, DecodeError>;
  46 }
  47
  48 /// Tracks localfeatures which are only in init messages
  49 #[derive(Clone, PartialEq)]
  50 pub struct LocalFeatures {
  51         flags: Vec<u8>,
  52 }
  53
  54 impl LocalFeatures {
  55         pub fn new() -> LocalFeatures {
  56                 LocalFeatures {
  57                         flags: Vec::new(),
  58                 }
  59         }
  60
  61         pub fn supports_data_loss_protect(&self) -> bool {
  62                 self.flags.len() > 0 && (self.flags[0] & 3) != 0
  63         }
  64         pub fn requires_data_loss_protect(&self) -> bool {
  65                 self.flags.len() > 0 && (self.flags[0] & 1) != 0
  66         }
  67
  68         pub fn initial_routing_sync(&self) -> bool {
  69                 self.flags.len() > 0 && (self.flags[0] & (1 << 3)) != 0
  70         }
  71         pub fn set_initial_routing_sync(&mut self) {
  72                 if self.flags.len() == 0 {
  73                         self.flags.resize(1, 1 << 3);
  74                 } else {
  75                         self.flags[0] |= 1 << 3;
  76                 }
  77         }
  78
  79         pub fn supports_upfront_shutdown_script(&self) -> bool {
  80                 self.flags.len() > 0 && (self.flags[0] & (3 << 4)) != 0
  81         }
  82         pub fn requires_upfront_shutdown_script(&self) -> bool {
  83                 self.flags.len() > 0 && (self.flags[0] & (1 << 4)) != 0
  84         }
  85
  86         pub fn requires_unknown_bits(&self) -> bool {
  87                 for (idx, &byte) in self.flags.iter().enumerate() {
  88                         if idx != 0 && (byte & 0x55) != 0 {
  89                                 return true;
  90                         } else if idx == 0 && (byte & 0x14) != 0 {
  91                                 return true;
  92                         }
  93                 }
  94                 return false;
  95         }
  96
  97         pub fn supports_unknown_bits(&self) -> bool {
  98                 for (idx, &byte) in self.flags.iter().enumerate() {
  99                         if idx != 0 && byte != 0 {
 100                                 return true;
 101                         } else if idx == 0 && (byte & 0xc4) != 0 {
 102                                 return true;
 103                         }
 104                 }
 105                 return false;
 106         }
 107 }
 108
 109 /// Tracks globalfeatures which are in init messages and routing announcements
 110 #[derive(Clone, PartialEq)]
 111 pub struct GlobalFeatures {
 112         flags: Vec<u8>,
 113 }
 114
 115 impl GlobalFeatures {
 116         pub fn new() -> GlobalFeatures {
 117                 GlobalFeatures {
 118                         flags: Vec::new(),
 119                 }
 120         }
 121
 122         pub fn requires_unknown_bits(&self) -> bool {
 123                 for &byte in self.flags.iter() {
 124                         if (byte & 0x55) != 0 {
 125                                 return true;
 126                         }
 127                 }
 128                 return false;
 129         }
 130
 131         pub fn supports_unknown_bits(&self) -> bool {
 132                 for &byte in self.flags.iter() {
 133                         if byte != 0 {
 134                                 return true;
 135                         }
 136                 }
 137                 return false;
 138         }
 139 }
 140
 141 pub struct Init {
 142         pub global_features: GlobalFeatures,
 143         pub local_features: LocalFeatures,
 144 }
 145
 146 pub struct ErrorMessage {
 147         pub channel_id: [u8; 32],
 148         pub data: String,
 149 }
 150
 151 pub struct Ping {
 152         pub ponglen: u16,
 153         pub byteslen: u16,
 154 }
 155
 156 pub struct Pong {
 157         pub byteslen: u16,
 158 }
 159
 160 pub struct OpenChannel {
 161         pub chain_hash: Sha256dHash,
 162         pub temporary_channel_id: [u8; 32],
 163         pub funding_satoshis: u64,
 164         pub push_msat: u64,
 165         pub dust_limit_satoshis: u64,
 166         pub max_htlc_value_in_flight_msat: u64,
 167         pub channel_reserve_satoshis: u64,
 168         pub htlc_minimum_msat: u64,
 169         pub feerate_per_kw: u32,
 170         pub to_self_delay: u16,
 171         pub max_accepted_htlcs: u16,
 172         pub funding_pubkey: PublicKey,
 173         pub revocation_basepoint: PublicKey,
 174         pub payment_basepoint: PublicKey,
 175         pub delayed_payment_basepoint: PublicKey,
 176         pub htlc_basepoint: PublicKey,
 177         pub first_per_commitment_point: PublicKey,
 178         pub channel_flags: u8,
 179         pub shutdown_scriptpubkey: Option<Script>,
 180 }
 181
 182 pub struct AcceptChannel {
 183         pub temporary_channel_id: [u8; 32],
 184         pub dust_limit_satoshis: u64,
 185         pub max_htlc_value_in_flight_msat: u64,
 186         pub channel_reserve_satoshis: u64,
 187         pub htlc_minimum_msat: u64,
 188         pub minimum_depth: u32,
 189         pub to_self_delay: u16,
 190         pub max_accepted_htlcs: u16,
 191         pub funding_pubkey: PublicKey,
 192         pub revocation_basepoint: PublicKey,
 193         pub payment_basepoint: PublicKey,
 194         pub delayed_payment_basepoint: PublicKey,
 195         pub htlc_basepoint: PublicKey,
 196         pub first_per_commitment_point: PublicKey,
 197         pub shutdown_scriptpubkey: Option<Script>,
 198 }
 199
 200 pub struct FundingCreated {
 201         pub temporary_channel_id: [u8; 32],
 202         pub funding_txid: Sha256dHash,
 203         pub funding_output_index: u16,
 204         pub signature: Signature,
 205 }
 206
 207 pub struct FundingSigned {
 208         pub channel_id: [u8; 32],
 209         pub signature: Signature,
 210 }
 211
 212 pub struct FundingLocked {
 213         pub channel_id: [u8; 32],
 214         pub next_per_commitment_point: PublicKey,
 215 }
 216
 217 pub struct Shutdown {
 218         pub channel_id: [u8; 32],
 219         pub scriptpubkey: Script,
 220 }
 221
 222 pub struct ClosingSigned {
 223         pub channel_id: [u8; 32],
 224         pub fee_satoshis: u64,
 225         pub signature: Signature,
 226 }
 227
 228 #[derive(Clone)]
 229 pub struct UpdateAddHTLC {
 230         pub channel_id: [u8; 32],
 231         pub htlc_id: u64,
 232         pub amount_msat: u64,
 233         pub payment_hash: [u8; 32],
 234         pub cltv_expiry: u32,
 235         pub onion_routing_packet: OnionPacket,
 236 }
 237
 238 #[derive(Clone)]
 239 pub struct UpdateFulfillHTLC {
 240         pub channel_id: [u8; 32],
 241         pub htlc_id: u64,
 242         pub payment_preimage: [u8; 32],
 243 }
 244
 245 #[derive(Clone)]
 246 pub struct UpdateFailHTLC {
 247         pub channel_id: [u8; 32],
 248         pub htlc_id: u64,
 249         pub reason: OnionErrorPacket,
 250 }
 251
 252 #[derive(Clone)]
 253 pub struct UpdateFailMalformedHTLC {
 254         pub channel_id: [u8; 32],
 255         pub htlc_id: u64,
 256         pub sha256_of_onion: [u8; 32],
 257         pub failure_code: u16,
 258 }
 259
 260 #[derive(Clone)]
 261 pub struct CommitmentSigned {
 262         pub channel_id: [u8; 32],
 263         pub signature: Signature,
 264         pub htlc_signatures: Vec<Signature>,
 265 }
 266
 267 pub struct RevokeAndACK {
 268         pub channel_id: [u8; 32],
 269         pub per_commitment_secret: [u8; 32],
 270         pub next_per_commitment_point: PublicKey,
 271 }
 272
 273 pub struct UpdateFee {
 274         pub channel_id: [u8; 32],
 275         pub feerate_per_kw: u32,
 276 }
 277
 278 pub struct ChannelReestablish {
 279         pub channel_id: [u8; 32],
 280         pub next_local_commitment_number: u64,
 281         pub next_remote_commitment_number: u64,
 282         pub your_last_per_commitment_secret: Option<[u8; 32]>,
 283         pub my_current_per_commitment_point: PublicKey,
 284 }
 285
 286 #[derive(Clone)]
 287 pub struct AnnouncementSignatures {
 288         pub channel_id: [u8; 32],
 289         pub short_channel_id: u64,
 290         pub node_signature: Signature,
 291         pub bitcoin_signature: Signature,
 292 }
 293
 294 #[derive(Clone)]
 295 pub enum NetAddress {
 296         IPv4 {
 297                 addr: [u8; 4],
 298                 port: u16,
 299         },
 300         IPv6 {
 301                 addr: [u8; 16],
 302                 port: u16,
 303         },
 304         OnionV2 {
 305                 addr: [u8; 10],
 306                 port: u16,
 307         },
 308         OnionV3 {
 309                 ed25519_pubkey: [u8; 32],
 310                 checksum: u16,
 311                 version: u8,
 312                 port: u16,
 313         },
 314 }
 315 impl NetAddress {
 316         fn get_id(&self) -> u8 {
 317                 match self {
 318                         &NetAddress::IPv4 {..} => { 1 },
 319                         &NetAddress::IPv6 {..} => { 2 },
 320                         &NetAddress::OnionV2 {..} => { 3 },
 321                         &NetAddress::OnionV3 {..} => { 4 },
 322                 }
 323         }
 324 }
 325
 326 pub struct UnsignedNodeAnnouncement {
 327         pub features: GlobalFeatures,
 328         pub timestamp: u32,
 329         pub node_id: PublicKey,
 330         pub rgb: [u8; 3],
 331         pub alias: [u8; 32],
 332         /// List of addresses on which this node is reachable. Note that you may only have up to one
 333         /// address of each type, if you have more, they may be silently discarded or we may panic!
 334         pub addresses: Vec<NetAddress>,
 335 }
 336 pub struct NodeAnnouncement {
 337         pub signature: Signature,
 338         pub contents: UnsignedNodeAnnouncement,
 339 }
 340
 341 #[derive(PartialEq, Clone)]
 342 pub struct UnsignedChannelAnnouncement {
 343         pub features: GlobalFeatures,
 344         pub chain_hash: Sha256dHash,
 345         pub short_channel_id: u64,
 346         pub node_id_1: PublicKey,
 347         pub node_id_2: PublicKey,
 348         pub bitcoin_key_1: PublicKey,
 349         pub bitcoin_key_2: PublicKey,
 350 }
 351 #[derive(PartialEq, Clone)]
 352 pub struct ChannelAnnouncement {
 353         pub node_signature_1: Signature,
 354         pub node_signature_2: Signature,
 355         pub bitcoin_signature_1: Signature,
 356         pub bitcoin_signature_2: Signature,
 357         pub contents: UnsignedChannelAnnouncement,
 358 }
 359
 360 #[derive(PartialEq, Clone)]
 361 pub struct UnsignedChannelUpdate {
 362         pub chain_hash: Sha256dHash,
 363         pub short_channel_id: u64,
 364         pub timestamp: u32,
 365         pub flags: u16,
 366         pub cltv_expiry_delta: u16,
 367         pub htlc_minimum_msat: u64,
 368         pub fee_base_msat: u32,
 369         pub fee_proportional_millionths: u32,
 370 }
 371 #[derive(PartialEq, Clone)]
 372 pub struct ChannelUpdate {
 373         pub signature: Signature,
 374         pub contents: UnsignedChannelUpdate,
 375 }
 376
 377 /// Used to put an error message in a HandleError
 378 pub enum ErrorAction {
 379         /// The peer took some action which made us think they were useless. Disconnect them.
 380         DisconnectPeer {
 381                 msg: Option<ErrorMessage>
 382         },
 383         /// The peer did something harmless that we weren't able to process, just log and ignore
 384         IgnoreError,
 385         /// The peer did something incorrect. Tell them.
 386         SendErrorMessage {
 387                 msg: ErrorMessage
 388         },
 389 }
 390
 391 pub struct HandleError { //TODO: rename me
 392         pub err: &'static str,
 393         pub action: Option<ErrorAction>, //TODO: Make this required
 394 }
 395
 396 /// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
 397 /// transaction updates if they were pending.
 398 pub struct CommitmentUpdate {
 399         pub update_add_htlcs: Vec<UpdateAddHTLC>,
 400         pub update_fulfill_htlcs: Vec<UpdateFulfillHTLC>,
 401         pub update_fail_htlcs: Vec<UpdateFailHTLC>,
 402         pub commitment_signed: CommitmentSigned,
 403 }
 404
 405 pub enum HTLCFailChannelUpdate {
 406         ChannelUpdateMessage {
 407                 msg: ChannelUpdate,
 408         },
 409         ChannelClosed {
 410                 short_channel_id: u64,
 411         },
 412 }
 413
 414 /// A trait to describe an object which can receive channel messages. Messages MAY be called in
 415 /// paralell when they originate from different their_node_ids, however they MUST NOT be called in
 416 /// paralell when the two calls have the same their_node_id.
 417 pub trait ChannelMessageHandler : events::EventsProvider + Send + Sync {
 418         //Channel init:
 419         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<AcceptChannel, HandleError>;
 420         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>;
 421         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated) -> Result<FundingSigned, HandleError>;
 422         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned) -> Result<(), HandleError>;
 423         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked) -> Result<Option<AnnouncementSignatures>, HandleError>;
 424
 425         // Channl close:
 426         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown) -> Result<(Option<Shutdown>, Option<ClosingSigned>), HandleError>;
 427         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned) -> Result<Option<ClosingSigned>, HandleError>;
 428
 429         // HTLC handling:
 430         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC) -> Result<(), HandleError>;
 431         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC) -> Result<(), HandleError>;
 432         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC) -> Result<Option<HTLCFailChannelUpdate>, HandleError>;
 433         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC) -> Result<(), HandleError>;
 434         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned) -> Result<(RevokeAndACK, Option<CommitmentSigned>), HandleError>;
 435         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK) -> Result<Option<CommitmentUpdate>, HandleError>;
 436
 437         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee) -> Result<(), HandleError>;
 438
 439         // Channel-to-announce:
 440         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures) -> Result<(), HandleError>;
 441
 442         // Error conditions:
 443         /// Indicates a connection to the peer failed/an existing connection was lost. If no connection
 444         /// is believed to be possible in the future (eg they're sending us messages we don't
 445         /// understand or indicate they require unknown feature bits), no_connection_possible is set
 446         /// and any outstanding channels should be failed.
 447         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
 448
 449         fn handle_error(&self, their_node_id: &PublicKey, msg: &ErrorMessage);
 450 }
 451
 452 pub trait RoutingMessageHandler : Send + Sync {
 453         fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<(), HandleError>;
 454         /// Handle a channel_announcement message, returning true if it should be forwarded on, false
 455         /// or returning an Err otherwise.
 456         fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, HandleError>;
 457         fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<(), HandleError>;
 458         fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
 459 }
 460
 461 pub struct OnionRealm0HopData {
 462         pub short_channel_id: u64,
 463         pub amt_to_forward: u64,
 464         pub outgoing_cltv_value: u32,
 465         // 12 bytes of 0-padding
 466 }
 467
 468 pub struct OnionHopData {
 469         pub realm: u8,
 470         pub data: OnionRealm0HopData,
 471         pub hmac: [u8; 32],
 472 }
 473 unsafe impl internal_traits::NoDealloc for OnionHopData{}
 474
 475 #[derive(Clone)]
 476 pub struct OnionPacket {
 477         pub version: u8,
 478         pub public_key: PublicKey,
 479         pub hop_data: [u8; 20*65],
 480         pub hmac: [u8; 32],
 481 }
 482
 483 pub struct DecodedOnionErrorPacket {
 484         pub hmac: [u8; 32],
 485         pub failuremsg: Vec<u8>,
 486         pub pad: Vec<u8>,
 487 }
 488
 489 #[derive(Clone)]
 490 pub struct OnionErrorPacket {
 491         // This really should be a constant size slice, but the spec lets these things be up to 128KB?
 492         // (TODO) We limit it in decode to much lower...
 493         pub data: Vec<u8>,
 494 }
 495
 496 impl Error for DecodeError {
 497         fn description(&self) -> &str {
 498                 match *self {
 499                         DecodeError::UnknownRealmByte => "Unknown realm byte in Onion packet",
 500                         DecodeError::BadPublicKey => "Invalid public key in packet",
 501                         DecodeError::BadSignature => "Invalid signature in packet",
 502                         DecodeError::BadText => "Invalid text in packet",
 503                         DecodeError::ShortRead => "Packet extended beyond the provided bytes",
 504                         DecodeError::ExtraAddressesPerType => "More than one address of a single type",
 505                         DecodeError::BadLengthDescriptor => "A length descriptor in the packet didn't describe the later data correctly",
 506                 }
 507         }
 508 }
 509 impl fmt::Display for DecodeError {
 510         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 511                 f.write_str(self.description())
 512         }
 513 }
 514
 515 impl fmt::Debug for HandleError {
 516         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 517                 f.write_str(self.err)
 518         }
 519 }
 520
 521 macro_rules! secp_pubkey {
 522         ( $ctx: expr, $slice: expr ) => {
 523                 match PublicKey::from_slice($ctx, $slice) {
 524                         Ok(key) => key,
 525                         Err(_) => return Err(DecodeError::BadPublicKey)
 526                 }
 527         };
 528 }
 529
 530 macro_rules! secp_signature {
 531         ( $ctx: expr, $slice: expr ) => {
 532                 match Signature::from_compact($ctx, $slice) {
 533                         Ok(sig) => sig,
 534                         Err(_) => return Err(DecodeError::BadSignature)
 535                 }
 536         };
 537 }
 538
 539 impl MsgDecodable for LocalFeatures {
 540         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 541                 if v.len() < 2 { return Err(DecodeError::ShortRead); }
 542                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 543                 if v.len() < len + 2 { return Err(DecodeError::ShortRead); }
 544                 let mut flags = Vec::with_capacity(len);
 545                 flags.extend_from_slice(&v[2..2 + len]);
 546                 Ok(Self {
 547                         flags: flags
 548                 })
 549         }
 550 }
 551 impl MsgEncodable for LocalFeatures {
 552         fn encode(&self) -> Vec<u8> {
 553                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 554                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 555                 res.extend_from_slice(&self.flags[..]);
 556                 res
 557         }
 558         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 559 }
 560
 561 impl MsgDecodable for GlobalFeatures {
 562         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 563                 if v.len() < 2 { return Err(DecodeError::ShortRead); }
 564                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 565                 if v.len() < len + 2 { return Err(DecodeError::ShortRead); }
 566                 let mut flags = Vec::with_capacity(len);
 567                 flags.extend_from_slice(&v[2..2 + len]);
 568                 Ok(Self {
 569                         flags: flags
 570                 })
 571         }
 572 }
 573 impl MsgEncodable for GlobalFeatures {
 574         fn encode(&self) -> Vec<u8> {
 575                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 576                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 577                 res.extend_from_slice(&self.flags[..]);
 578                 res
 579         }
 580         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 581 }
 582
 583 impl MsgDecodable for Init {
 584         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 585                 let global_features = GlobalFeatures::decode(v)?;
 586                 if v.len() < global_features.flags.len() + 4 {
 587                         return Err(DecodeError::ShortRead);
 588                 }
 589                 let local_features = LocalFeatures::decode(&v[global_features.flags.len() + 2..])?;
 590                 Ok(Self {
 591                         global_features: global_features,
 592                         local_features: local_features,
 593                 })
 594         }
 595 }
 596 impl MsgEncodable for Init {
 597         fn encode(&self) -> Vec<u8> {
 598                 let mut res = Vec::with_capacity(self.global_features.flags.len() + self.local_features.flags.len());
 599                 res.extend_from_slice(&self.global_features.encode()[..]);
 600                 res.extend_from_slice(&self.local_features.encode()[..]);
 601                 res
 602         }
 603 }
 604
 605 impl MsgDecodable for Ping {
 606         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 607                 if v.len() < 4 {
 608                         return Err(DecodeError::ShortRead);
 609                 }
 610                 let ponglen = byte_utils::slice_to_be16(&v[0..2]);
 611                 let byteslen = byte_utils::slice_to_be16(&v[2..4]);
 612                 if v.len() < 4 + byteslen as usize {
 613                         return Err(DecodeError::ShortRead);
 614                 }
 615                 Ok(Self {
 616                         ponglen,
 617                         byteslen,
 618                 })
 619         }
 620 }
 621 impl MsgEncodable for Ping {
 622         fn encode(&self) -> Vec<u8> {
 623                 let mut res = Vec::with_capacity(self.byteslen as usize + 2);
 624                 res.extend_from_slice(&byte_utils::be16_to_array(self.byteslen));
 625                 res.resize(2 + self.byteslen as usize, 0);
 626                 res
 627         }
 628 }
 629
 630 impl MsgDecodable for Pong {
 631         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 632                 if v.len() < 2 {
 633                         return Err(DecodeError::ShortRead);
 634                 }
 635                 let byteslen = byte_utils::slice_to_be16(&v[0..2]);
 636                 if v.len() < 2 + byteslen as usize {
 637                         return Err(DecodeError::ShortRead);
 638                 }
 639                 Ok(Self {
 640                         byteslen
 641                 })
 642         }
 643 }
 644 impl MsgEncodable for Pong {
 645         fn encode(&self) -> Vec<u8> {
 646                 let mut res = Vec::with_capacity(self.byteslen as usize + 2);
 647                 res.extend_from_slice(&byte_utils::be16_to_array(self.byteslen));
 648                 res.resize(2 + self.byteslen as usize, 0);
 649                 res
 650         }
 651 }
 652
 653 impl MsgDecodable for OpenChannel {
 654         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 655                 if v.len() < 2*32+6*8+4+2*2+6*33+1 {
 656                         return Err(DecodeError::ShortRead);
 657                 }
 658                 let ctx = Secp256k1::without_caps();
 659
 660                 let mut shutdown_scriptpubkey = None;
 661                 if v.len() >= 321 {
 662                         let len = byte_utils::slice_to_be16(&v[319..321]) as usize;
 663                         if v.len() < 321+len {
 664                                 return Err(DecodeError::ShortRead);
 665                         }
 666                         shutdown_scriptpubkey = Some(Script::from(v[321..321+len].to_vec()));
 667                 }
 668
 669                 Ok(OpenChannel {
 670                         chain_hash: deserialize(&v[0..32]).unwrap(),
 671                         temporary_channel_id: deserialize(&v[32..64]).unwrap(),
 672                         funding_satoshis: byte_utils::slice_to_be64(&v[64..72]),
 673                         push_msat: byte_utils::slice_to_be64(&v[72..80]),
 674                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[80..88]),
 675                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[88..96]),
 676                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[96..104]),
 677                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[104..112]),
 678                         feerate_per_kw: byte_utils::slice_to_be32(&v[112..116]),
 679                         to_self_delay: byte_utils::slice_to_be16(&v[116..118]),
 680                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[118..120]),
 681                         funding_pubkey: secp_pubkey!(&ctx, &v[120..153]),
 682                         revocation_basepoint: secp_pubkey!(&ctx, &v[153..186]),
 683                         payment_basepoint: secp_pubkey!(&ctx, &v[186..219]),
 684                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[219..252]),
 685                         htlc_basepoint: secp_pubkey!(&ctx, &v[252..285]),
 686                         first_per_commitment_point: secp_pubkey!(&ctx, &v[285..318]),
 687                         channel_flags: v[318],
 688                         shutdown_scriptpubkey: shutdown_scriptpubkey
 689                 })
 690         }
 691 }
 692 impl MsgEncodable for OpenChannel {
 693         fn encode(&self) -> Vec<u8> {
 694                 let mut res = match &self.shutdown_scriptpubkey {
 695                         &Some(ref script) => Vec::with_capacity(319 + 2 + script.len()),
 696                         &None => Vec::with_capacity(319),
 697                 };
 698                 res.extend_from_slice(&serialize(&self.chain_hash).unwrap());
 699                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap());
 700                 res.extend_from_slice(&byte_utils::be64_to_array(self.funding_satoshis));
 701                 res.extend_from_slice(&byte_utils::be64_to_array(self.push_msat));
 702                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 703                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 704                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 705                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 706                 res.extend_from_slice(&byte_utils::be32_to_array(self.feerate_per_kw));
 707                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 708                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 709                 res.extend_from_slice(&self.funding_pubkey.serialize());
 710                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 711                 res.extend_from_slice(&self.payment_basepoint.serialize());
 712                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 713                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 714                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 715                 res.push(self.channel_flags);
 716                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 717                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 718                         res.extend_from_slice(&script[..]);
 719                 }
 720                 res
 721         }
 722 }
 723
 724 impl MsgDecodable for AcceptChannel {
 725         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 726                 if v.len() < 32+4*8+4+2*2+6*33 {
 727                         return Err(DecodeError::ShortRead);
 728                 }
 729                 let ctx = Secp256k1::without_caps();
 730
 731                 let mut shutdown_scriptpubkey = None;
 732                 if v.len() >= 272 {
 733                         let len = byte_utils::slice_to_be16(&v[270..272]) as usize;
 734                         if v.len() < 272+len {
 735                                 return Err(DecodeError::ShortRead);
 736                         }
 737                         shutdown_scriptpubkey = Some(Script::from(v[272..272+len].to_vec()));
 738                 }
 739
 740                 let mut temporary_channel_id = [0; 32];
 741                 temporary_channel_id[..].copy_from_slice(&v[0..32]);
 742                 Ok(Self {
 743                         temporary_channel_id,
 744                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 745                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[40..48]),
 746                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[48..56]),
 747                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[56..64]),
 748                         minimum_depth: byte_utils::slice_to_be32(&v[64..68]),
 749                         to_self_delay: byte_utils::slice_to_be16(&v[68..70]),
 750                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[70..72]),
 751                         funding_pubkey: secp_pubkey!(&ctx, &v[72..105]),
 752                         revocation_basepoint: secp_pubkey!(&ctx, &v[105..138]),
 753                         payment_basepoint: secp_pubkey!(&ctx, &v[138..171]),
 754                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[171..204]),
 755                         htlc_basepoint: secp_pubkey!(&ctx, &v[204..237]),
 756                         first_per_commitment_point: secp_pubkey!(&ctx, &v[237..270]),
 757                         shutdown_scriptpubkey: shutdown_scriptpubkey
 758                 })
 759         }
 760 }
 761 impl MsgEncodable for AcceptChannel {
 762         fn encode(&self) -> Vec<u8> {
 763                 let mut res = match &self.shutdown_scriptpubkey {
 764                         &Some(ref script) => Vec::with_capacity(270 + 2 + script.len()),
 765                         &None => Vec::with_capacity(270),
 766                 };
 767                 res.extend_from_slice(&self.temporary_channel_id);
 768                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 769                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 770                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 771                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 772                 res.extend_from_slice(&byte_utils::be32_to_array(self.minimum_depth));
 773                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 774                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 775                 res.extend_from_slice(&self.funding_pubkey.serialize());
 776                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 777                 res.extend_from_slice(&self.payment_basepoint.serialize());
 778                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 779                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 780                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 781                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 782                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 783                         res.extend_from_slice(&script[..]);
 784                 }
 785                 res
 786         }
 787 }
 788
 789 impl MsgDecodable for FundingCreated {
 790         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 791                 if v.len() < 32+32+2+64 {
 792                         return Err(DecodeError::ShortRead);
 793                 }
 794                 let ctx = Secp256k1::without_caps();
 795                 let mut temporary_channel_id = [0; 32];
 796                 temporary_channel_id[..].copy_from_slice(&v[0..32]);
 797                 Ok(Self {
 798                         temporary_channel_id,
 799                         funding_txid: deserialize(&v[32..64]).unwrap(),
 800                         funding_output_index: byte_utils::slice_to_be16(&v[64..66]),
 801                         signature: secp_signature!(&ctx, &v[66..130]),
 802                 })
 803         }
 804 }
 805 impl MsgEncodable for FundingCreated {
 806         fn encode(&self) -> Vec<u8> {
 807                 let mut res = Vec::with_capacity(32+32+2+64);
 808                 res.extend_from_slice(&self.temporary_channel_id);
 809                 res.extend_from_slice(&serialize(&self.funding_txid).unwrap()[..]);
 810                 res.extend_from_slice(&byte_utils::be16_to_array(self.funding_output_index));
 811                 let secp_ctx = Secp256k1::without_caps();
 812                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 813                 res
 814         }
 815 }
 816
 817 impl MsgDecodable for FundingSigned {
 818         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 819                 if v.len() < 32+64 {
 820                         return Err(DecodeError::ShortRead);
 821                 }
 822                 let ctx = Secp256k1::without_caps();
 823                 let mut channel_id = [0; 32];
 824                 channel_id[..].copy_from_slice(&v[0..32]);
 825                 Ok(Self {
 826                         channel_id,
 827                         signature: secp_signature!(&ctx, &v[32..96]),
 828                 })
 829         }
 830 }
 831 impl MsgEncodable for FundingSigned {
 832         fn encode(&self) -> Vec<u8> {
 833                 let mut res = Vec::with_capacity(32+64);
 834                 res.extend_from_slice(&self.channel_id);
 835                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps()));
 836                 res
 837         }
 838 }
 839
 840 impl MsgDecodable for FundingLocked {
 841         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 842                 if v.len() < 32+33 {
 843                         return Err(DecodeError::ShortRead);
 844                 }
 845                 let ctx = Secp256k1::without_caps();
 846                 let mut channel_id = [0; 32];
 847                 channel_id[..].copy_from_slice(&v[0..32]);
 848                 Ok(Self {
 849                         channel_id,
 850                         next_per_commitment_point: secp_pubkey!(&ctx, &v[32..65]),
 851                 })
 852         }
 853 }
 854 impl MsgEncodable for FundingLocked {
 855         fn encode(&self) -> Vec<u8> {
 856                 let mut res = Vec::with_capacity(32+33);
 857                 res.extend_from_slice(&self.channel_id);
 858                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
 859                 res
 860         }
 861 }
 862
 863 impl MsgDecodable for Shutdown {
 864         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 865                 if v.len() < 32 + 2 {
 866                         return Err(DecodeError::ShortRead);
 867                 }
 868                 let scriptlen = byte_utils::slice_to_be16(&v[32..34]) as usize;
 869                 if v.len() < 32 + 2 + scriptlen {
 870                         return Err(DecodeError::ShortRead);
 871                 }
 872                 let mut channel_id = [0; 32];
 873                 channel_id[..].copy_from_slice(&v[0..32]);
 874                 Ok(Self {
 875                         channel_id,
 876                         scriptpubkey: Script::from(v[34..34 + scriptlen].to_vec()),
 877                 })
 878         }
 879 }
 880 impl MsgEncodable for Shutdown {
 881         fn encode(&self) -> Vec<u8> {
 882                 let mut res = Vec::with_capacity(32 + 2 + self.scriptpubkey.len());
 883                 res.extend_from_slice(&self.channel_id);
 884                 res.extend_from_slice(&byte_utils::be16_to_array(self.scriptpubkey.len() as u16));
 885                 res.extend_from_slice(&self.scriptpubkey[..]);
 886                 res
 887         }
 888 }
 889
 890 impl MsgDecodable for ClosingSigned {
 891         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 892                 if v.len() < 32 + 8 + 64 {
 893                         return Err(DecodeError::ShortRead);
 894                 }
 895                 let secp_ctx = Secp256k1::without_caps();
 896                 let mut channel_id = [0; 32];
 897                 channel_id[..].copy_from_slice(&v[0..32]);
 898                 Ok(Self {
 899                         channel_id,
 900                         fee_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 901                         signature: secp_signature!(&secp_ctx, &v[40..104]),
 902                 })
 903         }
 904 }
 905 impl MsgEncodable for ClosingSigned {
 906         fn encode(&self) -> Vec<u8> {
 907                 let mut res = Vec::with_capacity(32+8+64);
 908                 res.extend_from_slice(&self.channel_id);
 909                 res.extend_from_slice(&byte_utils::be64_to_array(self.fee_satoshis));
 910                 let secp_ctx = Secp256k1::without_caps();
 911                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 912                 res
 913         }
 914 }
 915
 916 impl MsgDecodable for UpdateAddHTLC {
 917         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 918                 if v.len() < 32+8+8+32+4+1+33+20*65+32 {
 919                         return Err(DecodeError::ShortRead);
 920                 }
 921                 let mut channel_id = [0; 32];
 922                 channel_id[..].copy_from_slice(&v[0..32]);
 923                 let mut payment_hash = [0; 32];
 924                 payment_hash.copy_from_slice(&v[48..80]);
 925                 Ok(Self{
 926                         channel_id,
 927                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 928                         amount_msat: byte_utils::slice_to_be64(&v[40..48]),
 929                         payment_hash,
 930                         cltv_expiry: byte_utils::slice_to_be32(&v[80..84]),
 931                         onion_routing_packet: OnionPacket::decode(&v[84..84+1366])?,
 932                 })
 933         }
 934 }
 935 impl MsgEncodable for UpdateAddHTLC {
 936         fn encode(&self) -> Vec<u8> {
 937                 let mut res = Vec::with_capacity(32+8+8+32+4+1366);
 938                 res.extend_from_slice(&self.channel_id);
 939                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 940                 res.extend_from_slice(&byte_utils::be64_to_array(self.amount_msat));
 941                 res.extend_from_slice(&self.payment_hash);
 942                 res.extend_from_slice(&byte_utils::be32_to_array(self.cltv_expiry));
 943                 res.extend_from_slice(&self.onion_routing_packet.encode()[..]);
 944                 res
 945         }
 946 }
 947
 948 impl MsgDecodable for UpdateFulfillHTLC {
 949         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 950                 if v.len() < 32+8+32 {
 951                         return Err(DecodeError::ShortRead);
 952                 }
 953                 let mut channel_id = [0; 32];
 954                 channel_id[..].copy_from_slice(&v[0..32]);
 955                 let mut payment_preimage = [0; 32];
 956                 payment_preimage.copy_from_slice(&v[40..72]);
 957                 Ok(Self{
 958                         channel_id,
 959                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 960                         payment_preimage,
 961                 })
 962         }
 963 }
 964 impl MsgEncodable for UpdateFulfillHTLC {
 965         fn encode(&self) -> Vec<u8> {
 966                 let mut res = Vec::with_capacity(32+8+32);
 967                 res.extend_from_slice(&self.channel_id);
 968                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 969                 res.extend_from_slice(&self.payment_preimage);
 970                 res
 971         }
 972 }
 973
 974 impl MsgDecodable for UpdateFailHTLC {
 975         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 976                 if v.len() < 32+8 {
 977                         return Err(DecodeError::ShortRead);
 978                 }
 979                 let mut channel_id = [0; 32];
 980                 channel_id[..].copy_from_slice(&v[0..32]);
 981                 Ok(Self{
 982                         channel_id,
 983                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 984                         reason: OnionErrorPacket::decode(&v[40..])?,
 985                 })
 986         }
 987 }
 988 impl MsgEncodable for UpdateFailHTLC {
 989         fn encode(&self) -> Vec<u8> {
 990                 let reason = self.reason.encode();
 991                 let mut res = Vec::with_capacity(32+8+reason.len());
 992                 res.extend_from_slice(&self.channel_id);
 993                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 994                 res.extend_from_slice(&reason[..]);
 995                 res
 996         }
 997 }
 998
 999 impl MsgDecodable for UpdateFailMalformedHTLC {
1000         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1001                 if v.len() < 32+8+32+2 {
1002                         return Err(DecodeError::ShortRead);
1003                 }
1004                 let mut channel_id = [0; 32];
1005                 channel_id[..].copy_from_slice(&v[0..32]);
1006                 let mut sha256_of_onion = [0; 32];
1007                 sha256_of_onion.copy_from_slice(&v[40..72]);
1008                 Ok(Self{
1009                         channel_id,
1010                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
1011                         sha256_of_onion,
1012                         failure_code: byte_utils::slice_to_be16(&v[72..74]),
1013                 })
1014         }
1015 }
1016 impl MsgEncodable for UpdateFailMalformedHTLC {
1017         fn encode(&self) -> Vec<u8> {
1018                 let mut res = Vec::with_capacity(32+8+32+2);
1019                 res.extend_from_slice(&self.channel_id);
1020                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
1021                 res.extend_from_slice(&self.sha256_of_onion);
1022                 res.extend_from_slice(&byte_utils::be16_to_array(self.failure_code));
1023                 res
1024         }
1025 }
1026
1027 impl MsgDecodable for CommitmentSigned {
1028         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1029                 if v.len() < 32+64+2 {
1030                         return Err(DecodeError::ShortRead);
1031                 }
1032                 let mut channel_id = [0; 32];
1033                 channel_id[..].copy_from_slice(&v[0..32]);
1034
1035                 let htlcs = byte_utils::slice_to_be16(&v[96..98]) as usize;
1036                 if v.len() < 32+64+2+htlcs*64 {
1037                         return Err(DecodeError::ShortRead);
1038                 }
1039                 let mut htlc_signatures = Vec::with_capacity(htlcs);
1040                 let secp_ctx = Secp256k1::without_caps();
1041                 for i in 0..htlcs {
1042                         htlc_signatures.push(secp_signature!(&secp_ctx, &v[98+i*64..98+(i+1)*64]));
1043                 }
1044                 Ok(Self {
1045                         channel_id,
1046                         signature: secp_signature!(&secp_ctx, &v[32..96]),
1047                         htlc_signatures,
1048                 })
1049         }
1050 }
1051 impl MsgEncodable for CommitmentSigned {
1052         fn encode(&self) -> Vec<u8> {
1053                 let mut res = Vec::with_capacity(32+64+2+self.htlc_signatures.len()*64);
1054                 res.extend_from_slice(&self.channel_id);
1055                 let secp_ctx = Secp256k1::without_caps();
1056                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
1057                 res.extend_from_slice(&byte_utils::be16_to_array(self.htlc_signatures.len() as u16));
1058                 for i in 0..self.htlc_signatures.len() {
1059                         res.extend_from_slice(&self.htlc_signatures[i].serialize_compact(&secp_ctx));
1060                 }
1061                 res
1062         }
1063 }
1064
1065 impl MsgDecodable for RevokeAndACK {
1066         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1067                 if v.len() < 32+32+33 {
1068                         return Err(DecodeError::ShortRead);
1069                 }
1070                 let mut channel_id = [0; 32];
1071                 channel_id[..].copy_from_slice(&v[0..32]);
1072                 let mut per_commitment_secret = [0; 32];
1073                 per_commitment_secret.copy_from_slice(&v[32..64]);
1074                 let secp_ctx = Secp256k1::without_caps();
1075                 Ok(Self {
1076                         channel_id,
1077                         per_commitment_secret,
1078                         next_per_commitment_point: secp_pubkey!(&secp_ctx, &v[64..97]),
1079                 })
1080         }
1081 }
1082 impl MsgEncodable for RevokeAndACK {
1083         fn encode(&self) -> Vec<u8> {
1084                 let mut res = Vec::with_capacity(32+32+33);
1085                 res.extend_from_slice(&self.channel_id);
1086                 res.extend_from_slice(&self.per_commitment_secret);
1087                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
1088                 res
1089         }
1090 }
1091
1092 impl MsgDecodable for UpdateFee {
1093         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1094                 if v.len() < 32+4 {
1095                         return Err(DecodeError::ShortRead);
1096                 }
1097                 let mut channel_id = [0; 32];
1098                 channel_id[..].copy_from_slice(&v[0..32]);
1099                 Ok(Self {
1100                         channel_id,
1101                         feerate_per_kw: byte_utils::slice_to_be32(&v[32..36]),
1102                 })
1103         }
1104 }
1105 impl MsgEncodable for UpdateFee {
1106         fn encode(&self) -> Vec<u8> {
1107                 let mut res = Vec::with_capacity(32+4);
1108                 res.extend_from_slice(&self.channel_id);
1109                 res.extend_from_slice(&byte_utils::be32_to_array(self.feerate_per_kw));
1110                 res
1111         }
1112 }
1113
1114 impl MsgDecodable for ChannelReestablish {
1115         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1116                 if v.len() < 32+2*8+33 {
1117                         return Err(DecodeError::ShortRead);
1118                 }
1119
1120                 let your_last_per_commitment_secret = if v.len() > 32+2*8+33 {
1121                         if v.len() < 32+2*8+33 + 32 {
1122                                 return Err(DecodeError::ShortRead);
1123                         }
1124                         let mut inner_array = [0; 32];
1125                         inner_array.copy_from_slice(&v[48..48+32]);
1126                         Some(inner_array)
1127                 } else { None };
1128
1129                 let option_size = match &your_last_per_commitment_secret {
1130                         &Some(ref _ary) => 32,
1131                         &None => 0,
1132                 };
1133                 Ok(Self {
1134                         channel_id: deserialize(&v[0..32]).unwrap(),
1135                         next_local_commitment_number: byte_utils::slice_to_be64(&v[32..40]),
1136                         next_remote_commitment_number: byte_utils::slice_to_be64(&v[40..48]),
1137                         your_last_per_commitment_secret: your_last_per_commitment_secret,
1138                         my_current_per_commitment_point: {
1139                                 let ctx = Secp256k1::without_caps();
1140                                 secp_pubkey!(&ctx, &v[48+option_size..48+option_size+33])
1141                         }
1142                 })
1143         }
1144 }
1145 impl MsgEncodable for ChannelReestablish {
1146         fn encode(&self) -> Vec<u8> {
1147                 let mut res = Vec::with_capacity(if self.your_last_per_commitment_secret.is_some() { 32+2*3+33 + 32 } else { 32+2*8+33 });
1148
1149                 res.extend_from_slice(&serialize(&self.channel_id).unwrap()[..]);
1150                 res.extend_from_slice(&byte_utils::be64_to_array(self.next_local_commitment_number));
1151                 res.extend_from_slice(&byte_utils::be64_to_array(self.next_remote_commitment_number));
1152
1153                 if let &Some(ref ary) = &self.your_last_per_commitment_secret {
1154                         res.extend_from_slice(&ary[..]);
1155                 }
1156
1157                 res.extend_from_slice(&self.my_current_per_commitment_point.serialize());
1158                 res
1159         }
1160 }
1161
1162 impl MsgDecodable for AnnouncementSignatures {
1163         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1164                 if v.len() < 32+8+64*2 {
1165                         return Err(DecodeError::ShortRead);
1166                 }
1167                 let secp_ctx = Secp256k1::without_caps();
1168                 let mut channel_id = [0; 32];
1169                 channel_id[..].copy_from_slice(&v[0..32]);
1170                 Ok(Self {
1171                         channel_id,
1172                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1173                         node_signature: secp_signature!(&secp_ctx, &v[40..104]),
1174                         bitcoin_signature: secp_signature!(&secp_ctx, &v[104..168]),
1175                 })
1176         }
1177 }
1178 impl MsgEncodable for AnnouncementSignatures {
1179         fn encode(&self) -> Vec<u8> {
1180                 let mut res = Vec::with_capacity(32+8+64*2);
1181                 res.extend_from_slice(&self.channel_id);
1182                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1183                 let secp_ctx = Secp256k1::without_caps();
1184                 res.extend_from_slice(&self.node_signature.serialize_compact(&secp_ctx));
1185                 res.extend_from_slice(&self.bitcoin_signature.serialize_compact(&secp_ctx));
1186                 res
1187         }
1188 }
1189
1190 impl MsgDecodable for UnsignedNodeAnnouncement {
1191         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1192                 let features = GlobalFeatures::decode(&v[..])?;
1193                 if v.len() < features.encoded_len() + 4 + 33 + 3 + 32 + 2 {
1194                         return Err(DecodeError::ShortRead);
1195                 }
1196                 let start = features.encoded_len();
1197
1198                 let mut rgb = [0; 3];
1199                 rgb.copy_from_slice(&v[start + 37..start + 40]);
1200
1201                 let mut alias = [0; 32];
1202                 alias.copy_from_slice(&v[start + 40..start + 72]);
1203
1204                 let addrlen = byte_utils::slice_to_be16(&v[start + 72..start + 74]) as usize;
1205                 if v.len() < start + 74 + addrlen {
1206                         return Err(DecodeError::ShortRead);
1207                 }
1208                 let addr_read_limit = start + 74 + addrlen;
1209
1210                 let mut addresses = Vec::with_capacity(4);
1211                 let mut read_pos = start + 74;
1212                 loop {
1213                         if addr_read_limit <= read_pos { break; }
1214                         match v[read_pos] {
1215                                 0 => { read_pos += 1; },
1216                                 1 => {
1217                                         if addresses.len() > 0 {
1218                                                 return Err(DecodeError::ExtraAddressesPerType);
1219                                         }
1220                                         if addr_read_limit < read_pos + 1 + 6 {
1221                                                 return Err(DecodeError::BadLengthDescriptor);
1222                                         }
1223                                         let mut addr = [0; 4];
1224                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 5]);
1225                                         addresses.push(NetAddress::IPv4 {
1226                                                 addr,
1227                                                 port: byte_utils::slice_to_be16(&v[read_pos + 5..read_pos + 7]),
1228                                         });
1229                                         read_pos += 1 + 6;
1230                                 },
1231                                 2 => {
1232                                         if addresses.len() > 1 || (addresses.len() == 1 && addresses[0].get_id() != 1) {
1233                                                 return Err(DecodeError::ExtraAddressesPerType);
1234                                         }
1235                                         if addr_read_limit < read_pos + 1 + 18 {
1236                                                 return Err(DecodeError::BadLengthDescriptor);
1237                                         }
1238                                         let mut addr = [0; 16];
1239                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 17]);
1240                                         addresses.push(NetAddress::IPv6 {
1241                                                 addr,
1242                                                 port: byte_utils::slice_to_be16(&v[read_pos + 17..read_pos + 19]),
1243                                         });
1244                                         read_pos += 1 + 18;
1245                                 },
1246                                 3 => {
1247                                         if addresses.len() > 2 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 2) {
1248                                                 return Err(DecodeError::ExtraAddressesPerType);
1249                                         }
1250                                         if addr_read_limit < read_pos + 1 + 12 {
1251                                                 return Err(DecodeError::BadLengthDescriptor);
1252                                         }
1253                                         let mut addr = [0; 10];
1254                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 11]);
1255                                         addresses.push(NetAddress::OnionV2 {
1256                                                 addr,
1257                                                 port: byte_utils::slice_to_be16(&v[read_pos + 11..read_pos + 13]),
1258                                         });
1259                                         read_pos += 1 + 12;
1260                                 },
1261                                 4 => {
1262                                         if addresses.len() > 3 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 3) {
1263                                                 return Err(DecodeError::ExtraAddressesPerType);
1264                                         }
1265                                         if addr_read_limit < read_pos + 1 + 37 {
1266                                                 return Err(DecodeError::BadLengthDescriptor);
1267                                         }
1268                                         let mut ed25519_pubkey = [0; 32];
1269                                         ed25519_pubkey.copy_from_slice(&v[read_pos + 1..read_pos + 33]);
1270                                         addresses.push(NetAddress::OnionV3 {
1271                                                 ed25519_pubkey,
1272                                                 checksum: byte_utils::slice_to_be16(&v[read_pos + 33..read_pos + 35]),
1273                                                 version: v[read_pos + 35],
1274                                                 port: byte_utils::slice_to_be16(&v[read_pos + 36..read_pos + 38]),
1275                                         });
1276                                         read_pos += 1 + 37;
1277                                 },
1278                                 _ => { break; } // We've read all we can, we dont understand anything higher (and they're sorted)
1279                         }
1280                 }
1281
1282                 let secp_ctx = Secp256k1::without_caps();
1283                 Ok(Self {
1284                         features,
1285                         timestamp: byte_utils::slice_to_be32(&v[start..start + 4]),
1286                         node_id: secp_pubkey!(&secp_ctx, &v[start + 4..start + 37]),
1287                         rgb,
1288                         alias,
1289                         addresses,
1290                 })
1291         }
1292 }
1293 impl MsgEncodable for UnsignedNodeAnnouncement {
1294         fn encode(&self) -> Vec<u8> {
1295                 let features = self.features.encode();
1296                 let mut res = Vec::with_capacity(74 + features.len() + self.addresses.len());
1297                 res.extend_from_slice(&features[..]);
1298                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1299                 res.extend_from_slice(&self.node_id.serialize());
1300                 res.extend_from_slice(&self.rgb);
1301                 res.extend_from_slice(&self.alias);
1302                 let mut addr_slice = Vec::with_capacity(self.addresses.len() * 18);
1303                 let mut addrs_to_encode = self.addresses.clone();
1304                 addrs_to_encode.sort_unstable_by(|a, b| { a.get_id().cmp(&b.get_id()) });
1305                 addrs_to_encode.dedup_by(|a, b| { a.get_id() == b.get_id() });
1306                 for addr in addrs_to_encode.iter() {
1307                         match addr {
1308                                 &NetAddress::IPv4{addr, port} => {
1309                                         addr_slice.push(1);
1310                                         addr_slice.extend_from_slice(&addr);
1311                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1312                                 },
1313                                 &NetAddress::IPv6{addr, port} => {
1314                                         addr_slice.push(2);
1315                                         addr_slice.extend_from_slice(&addr);
1316                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1317                                 },
1318                                 &NetAddress::OnionV2{addr, port} => {
1319                                         addr_slice.push(3);
1320                                         addr_slice.extend_from_slice(&addr);
1321                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1322                                 },
1323                                 &NetAddress::OnionV3{ed25519_pubkey, checksum, version, port} => {
1324                                         addr_slice.push(4);
1325                                         addr_slice.extend_from_slice(&ed25519_pubkey);
1326                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(checksum));
1327                                         addr_slice.push(version);
1328                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1329                                 },
1330                         }
1331                 }
1332                 res.extend_from_slice(&byte_utils::be16_to_array(addr_slice.len() as u16));
1333                 res.extend_from_slice(&addr_slice[..]);
1334                 res
1335         }
1336 }
1337
1338 impl MsgDecodable for NodeAnnouncement {
1339         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1340                 if v.len() < 64 {
1341                         return Err(DecodeError::ShortRead);
1342                 }
1343                 let secp_ctx = Secp256k1::without_caps();
1344                 Ok(Self {
1345                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1346                         contents: UnsignedNodeAnnouncement::decode(&v[64..])?,
1347                 })
1348         }
1349 }
1350 impl MsgEncodable for NodeAnnouncement {
1351         fn encode(&self) -> Vec<u8> {
1352                 let contents = self.contents.encode();
1353                 let mut res = Vec::with_capacity(64 + contents.len());
1354                 let secp_ctx = Secp256k1::without_caps();
1355                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
1356                 res.extend_from_slice(&contents);
1357                 res
1358         }
1359 }
1360
1361 impl MsgDecodable for UnsignedChannelAnnouncement {
1362         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1363                 let features = GlobalFeatures::decode(&v[..])?;
1364                 if v.len() < features.encoded_len() + 32 + 8 + 33*4 {
1365                         return Err(DecodeError::ShortRead);
1366                 }
1367                 let start = features.encoded_len();
1368                 let secp_ctx = Secp256k1::without_caps();
1369                 Ok(Self {
1370                         features,
1371                         chain_hash: deserialize(&v[start..start + 32]).unwrap(),
1372                         short_channel_id: byte_utils::slice_to_be64(&v[start + 32..start + 40]),
1373                         node_id_1: secp_pubkey!(&secp_ctx, &v[start + 40..start + 73]),
1374                         node_id_2: secp_pubkey!(&secp_ctx, &v[start + 73..start + 106]),
1375                         bitcoin_key_1: secp_pubkey!(&secp_ctx, &v[start + 106..start + 139]),
1376                         bitcoin_key_2: secp_pubkey!(&secp_ctx, &v[start + 139..start + 172]),
1377                 })
1378         }
1379 }
1380 impl MsgEncodable for UnsignedChannelAnnouncement {
1381         fn encode(&self) -> Vec<u8> {
1382                 let features = self.features.encode();
1383                 let mut res = Vec::with_capacity(172 + features.len());
1384                 res.extend_from_slice(&features[..]);
1385                 res.extend_from_slice(&self.chain_hash[..]);
1386                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1387                 res.extend_from_slice(&self.node_id_1.serialize());
1388                 res.extend_from_slice(&self.node_id_2.serialize());
1389                 res.extend_from_slice(&self.bitcoin_key_1.serialize());
1390                 res.extend_from_slice(&self.bitcoin_key_2.serialize());
1391                 res
1392         }
1393 }
1394
1395 impl MsgDecodable for ChannelAnnouncement {
1396         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1397                 if v.len() < 64*4 {
1398                         return Err(DecodeError::ShortRead);
1399                 }
1400                 let secp_ctx = Secp256k1::without_caps();
1401                 Ok(Self {
1402                         node_signature_1: secp_signature!(&secp_ctx, &v[0..64]),
1403                         node_signature_2: secp_signature!(&secp_ctx, &v[64..128]),
1404                         bitcoin_signature_1: secp_signature!(&secp_ctx, &v[128..192]),
1405                         bitcoin_signature_2: secp_signature!(&secp_ctx, &v[192..256]),
1406                         contents: UnsignedChannelAnnouncement::decode(&v[256..])?,
1407                 })
1408         }
1409 }
1410 impl MsgEncodable for ChannelAnnouncement {
1411         fn encode(&self) -> Vec<u8> {
1412                 let secp_ctx = Secp256k1::without_caps();
1413                 let contents = self.contents.encode();
1414                 let mut res = Vec::with_capacity(64 + contents.len());
1415                 res.extend_from_slice(&self.node_signature_1.serialize_compact(&secp_ctx));
1416                 res.extend_from_slice(&self.node_signature_2.serialize_compact(&secp_ctx));
1417                 res.extend_from_slice(&self.bitcoin_signature_1.serialize_compact(&secp_ctx));
1418                 res.extend_from_slice(&self.bitcoin_signature_2.serialize_compact(&secp_ctx));
1419                 res.extend_from_slice(&contents);
1420                 res
1421         }
1422 }
1423
1424 impl MsgDecodable for UnsignedChannelUpdate {
1425         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1426                 if v.len() < 32+8+4+2+2+8+4+4 {
1427                         return Err(DecodeError::ShortRead);
1428                 }
1429                 Ok(Self {
1430                         chain_hash: deserialize(&v[0..32]).unwrap(),
1431                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1432                         timestamp: byte_utils::slice_to_be32(&v[40..44]),
1433                         flags: byte_utils::slice_to_be16(&v[44..46]),
1434                         cltv_expiry_delta: byte_utils::slice_to_be16(&v[46..48]),
1435                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[48..56]),
1436                         fee_base_msat: byte_utils::slice_to_be32(&v[56..60]),
1437                         fee_proportional_millionths: byte_utils::slice_to_be32(&v[60..64]),
1438                 })
1439         }
1440 }
1441 impl MsgEncodable for UnsignedChannelUpdate {
1442         fn encode(&self) -> Vec<u8> {
1443                 let mut res = Vec::with_capacity(64);
1444                 res.extend_from_slice(&self.chain_hash[..]);
1445                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1446                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1447                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags));
1448                 res.extend_from_slice(&byte_utils::be16_to_array(self.cltv_expiry_delta));
1449                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
1450                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_base_msat));
1451                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_proportional_millionths));
1452                 res
1453         }
1454 }
1455
1456 impl MsgDecodable for ChannelUpdate {
1457         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1458                 if v.len() < 128 {
1459                         return Err(DecodeError::ShortRead);
1460                 }
1461                 let secp_ctx = Secp256k1::without_caps();
1462                 Ok(Self {
1463                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1464                         contents: UnsignedChannelUpdate::decode(&v[64..])?,
1465                 })
1466         }
1467 }
1468 impl MsgEncodable for ChannelUpdate {
1469         fn encode(&self) -> Vec<u8> {
1470                 let mut res = Vec::with_capacity(128);
1471                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps())[..]);
1472                 res.extend_from_slice(&self.contents.encode()[..]);
1473                 res
1474         }
1475 }
1476
1477 impl MsgDecodable for OnionRealm0HopData {
1478         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1479                 if v.len() < 32 {
1480                         return Err(DecodeError::ShortRead);
1481                 }
1482                 Ok(OnionRealm0HopData {
1483                         short_channel_id: byte_utils::slice_to_be64(&v[0..8]),
1484                         amt_to_forward: byte_utils::slice_to_be64(&v[8..16]),
1485                         outgoing_cltv_value: byte_utils::slice_to_be32(&v[16..20]),
1486                 })
1487         }
1488 }
1489 impl MsgEncodable for OnionRealm0HopData {
1490         fn encode(&self) -> Vec<u8> {
1491                 let mut res = Vec::with_capacity(32);
1492                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1493                 res.extend_from_slice(&byte_utils::be64_to_array(self.amt_to_forward));
1494                 res.extend_from_slice(&byte_utils::be32_to_array(self.outgoing_cltv_value));
1495                 res.resize(32, 0);
1496                 res
1497         }
1498 }
1499
1500 impl MsgDecodable for OnionHopData {
1501         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1502                 if v.len() < 65 {
1503                         return Err(DecodeError::ShortRead);
1504                 }
1505                 let realm = v[0];
1506                 if realm != 0 {
1507                         return Err(DecodeError::UnknownRealmByte);
1508                 }
1509                 let mut hmac = [0; 32];
1510                 hmac[..].copy_from_slice(&v[33..65]);
1511                 Ok(OnionHopData {
1512                         realm: realm,
1513                         data: OnionRealm0HopData::decode(&v[1..33])?,
1514                         hmac: hmac,
1515                 })
1516         }
1517 }
1518 impl MsgEncodable for OnionHopData {
1519         fn encode(&self) -> Vec<u8> {
1520                 let mut res = Vec::with_capacity(65);
1521                 res.push(self.realm);
1522                 res.extend_from_slice(&self.data.encode()[..]);
1523                 res.extend_from_slice(&self.hmac);
1524                 res
1525         }
1526 }
1527
1528 impl MsgDecodable for OnionPacket {
1529         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1530                 if v.len() < 1+33+20*65+32 {
1531                         return Err(DecodeError::ShortRead);
1532                 }
1533                 let mut hop_data = [0; 20*65];
1534                 hop_data.copy_from_slice(&v[34..1334]);
1535                 let mut hmac = [0; 32];
1536                 hmac.copy_from_slice(&v[1334..1366]);
1537                 let secp_ctx = Secp256k1::without_caps();
1538                 Ok(Self {
1539                         version: v[0],
1540                         public_key: secp_pubkey!(&secp_ctx, &v[1..34]),
1541                         hop_data,
1542                         hmac,
1543                 })
1544         }
1545 }
1546 impl MsgEncodable for OnionPacket {
1547         fn encode(&self) -> Vec<u8> {
1548                 let mut res = Vec::with_capacity(1 + 33 + 20*65 + 32);
1549                 res.push(self.version);
1550                 res.extend_from_slice(&self.public_key.serialize());
1551                 res.extend_from_slice(&self.hop_data);
1552                 res.extend_from_slice(&self.hmac);
1553                 res
1554         }
1555 }
1556
1557 impl MsgDecodable for DecodedOnionErrorPacket {
1558         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1559                 if v.len() < 32 + 4 {
1560                         return Err(DecodeError::ShortRead);
1561                 }
1562                 let failuremsg_len = byte_utils::slice_to_be16(&v[32..34]) as usize;
1563                 if v.len() < 32 + 4 + failuremsg_len {
1564                         return Err(DecodeError::ShortRead);
1565                 }
1566                 let padding_len = byte_utils::slice_to_be16(&v[34 + failuremsg_len..]) as usize;
1567                 if v.len() < 32 + 4 + failuremsg_len + padding_len {
1568                         return Err(DecodeError::ShortRead);
1569                 }
1570
1571                 let mut hmac = [0; 32];
1572                 hmac.copy_from_slice(&v[0..32]);
1573                 Ok(Self {
1574                         hmac,
1575                         failuremsg: v[34..34 + failuremsg_len].to_vec(),
1576                         pad: v[36 + failuremsg_len..36 + failuremsg_len + padding_len].to_vec(),
1577                 })
1578         }
1579 }
1580 impl MsgEncodable for DecodedOnionErrorPacket {
1581         fn encode(&self) -> Vec<u8> {
1582                 let mut res = Vec::with_capacity(32 + 4 + self.failuremsg.len() + self.pad.len());
1583                 res.extend_from_slice(&self.hmac);
1584                 res.extend_from_slice(&[((self.failuremsg.len() >> 8) & 0xff) as u8, (self.failuremsg.len() & 0xff) as u8]);
1585                 res.extend_from_slice(&self.failuremsg);
1586                 res.extend_from_slice(&[((self.pad.len() >> 8) & 0xff) as u8, (self.pad.len() & 0xff) as u8]);
1587                 res.extend_from_slice(&self.pad);
1588                 res
1589         }
1590 }
1591
1592 impl MsgDecodable for OnionErrorPacket {
1593         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1594                 if v.len() < 2 {
1595                         return Err(DecodeError::ShortRead);
1596                 }
1597                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
1598                 if v.len() < 2 + len {
1599                         return Err(DecodeError::ShortRead);
1600                 }
1601                 Ok(Self {
1602                         data: v[2..len+2].to_vec(),
1603                 })
1604         }
1605 }
1606 impl MsgEncodable for OnionErrorPacket {
1607         fn encode(&self) -> Vec<u8> {
1608                 let mut res = Vec::with_capacity(2 + self.data.len());
1609                 res.extend_from_slice(&byte_utils::be16_to_array(self.data.len() as u16));
1610                 res.extend_from_slice(&self.data);
1611                 res
1612         }
1613 }
1614
1615 impl MsgEncodable for ErrorMessage {
1616         fn encode(&self) -> Vec<u8> {
1617                 let mut res = Vec::with_capacity(34 + self.data.len());
1618                 res.extend_from_slice(&self.channel_id);
1619                 res.extend_from_slice(&byte_utils::be16_to_array(self.data.len() as u16));
1620                 res.extend_from_slice(&self.data.as_bytes());
1621                 res
1622         }
1623 }
1624 impl MsgDecodable for ErrorMessage {
1625         fn decode(v: &[u8]) -> Result<Self,DecodeError> {
1626                 if v.len() < 34 {
1627                         return Err(DecodeError::ShortRead);
1628                 }
1629                 // Unlike most messages, BOLT 1 requires we truncate our read if the value is out of range
1630                 let len = cmp::min(byte_utils::slice_to_be16(&v[32..34]) as usize, v.len() - 34);
1631                 let data = match String::from_utf8(v[34..34 + len].to_vec()) {
1632                         Ok(s) => s,
1633                         Err(_) => return Err(DecodeError::BadText),
1634                 };
1635                 let mut channel_id = [0; 32];
1636                 channel_id[..].copy_from_slice(&v[0..32]);
1637                 Ok(Self {
1638                         channel_id,
1639                         data,
1640                 })
1641         }
1642 }
1643
1644 #[cfg(test)]
1645 mod tests {
1646         use hex;
1647         use ln::msgs::MsgEncodable;
1648         use ln::msgs;
1649         use secp256k1::key::{PublicKey,SecretKey};
1650         use secp256k1::Secp256k1;
1651
1652         #[test]
1653         fn encoding_channel_reestablish_no_secret() {
1654                 let public_key = {
1655                         let secp_ctx = Secp256k1::new();
1656                         PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap())
1657                 };
1658
1659                 let cr = msgs::ChannelReestablish {
1660                         channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
1661                         next_local_commitment_number: 3,
1662                         next_remote_commitment_number: 4,
1663                         your_last_per_commitment_secret: None,
1664                         my_current_per_commitment_point: public_key,
1665                 };
1666
1667                 let encoded_value = cr.encode();
1668                 assert_eq!(
1669                         encoded_value,
1670                         vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 3, 27, 132, 197, 86, 123, 18, 100, 64, 153, 93, 62, 213, 170, 186, 5, 101, 215, 30, 24, 52, 96, 72, 25, 255, 156, 23, 245, 233, 213, 221, 7, 143]
1671                 );
1672         }
1673
1674         #[test]
1675         fn encoding_channel_reestablish_with_secret() {
1676                 let public_key = {
1677                         let secp_ctx = Secp256k1::new();
1678                         PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap())
1679                 };
1680
1681                 let cr = msgs::ChannelReestablish {
1682                         channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
1683                         next_local_commitment_number: 3,
1684                         next_remote_commitment_number: 4,
1685                         your_last_per_commitment_secret: Some([9; 32]),
1686                         my_current_per_commitment_point: public_key,
1687                 };
1688
1689                 let encoded_value = cr.encode();
1690                 assert_eq!(
1691                         encoded_value,
1692                         vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 3, 27, 132, 197, 86, 123, 18, 100, 64, 153, 93, 62, 213, 170, 186, 5, 101, 215, 30, 24, 52, 96, 72, 25, 255, 156, 23, 245, 233, 213, 221, 7, 143]
1693                 );
1694         }
1695 }