_ 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::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         /// Indicates an inbound HTLC add resulted in a failure, and the UpdateFailHTLC provided in msg
 380         /// should be sent back to the sender.
 381         UpdateFailHTLC {
 382                 msg: UpdateFailHTLC
 383         },
 384         /// The peer took some action which made us think they were useless. Disconnect them.
 385         DisconnectPeer {
 386                 msg: Option<ErrorMessage>
 387         },
 388         /// The peer did something harmless that we weren't able to process, just log and ignore
 389         IgnoreError,
 390         /// The peer did something incorrect. Tell them.
 391         SendErrorMessage {
 392                 msg: ErrorMessage
 393         },
 394 }
 395
 396 pub struct HandleError { //TODO: rename me
 397         pub err: &'static str,
 398         pub action: Option<ErrorAction>, //TODO: Make this required
 399 }
 400
 401 /// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
 402 /// transaction updates if they were pending.
 403 pub struct CommitmentUpdate {
 404         pub update_add_htlcs: Vec<UpdateAddHTLC>,
 405         pub update_fulfill_htlcs: Vec<UpdateFulfillHTLC>,
 406         pub update_fail_htlcs: Vec<UpdateFailHTLC>,
 407         pub commitment_signed: CommitmentSigned,
 408 }
 409
 410 pub enum HTLCFailChannelUpdate {
 411         ChannelUpdateMessage {
 412                 msg: ChannelUpdate,
 413         },
 414         ChannelClosed {
 415                 short_channel_id: u64,
 416         },
 417 }
 418
 419 /// A trait to describe an object which can receive channel messages. Messages MAY be called in
 420 /// paralell when they originate from different their_node_ids, however they MUST NOT be called in
 421 /// paralell when the two calls have the same their_node_id.
 422 pub trait ChannelMessageHandler : events::EventsProvider + Send + Sync {
 423         //Channel init:
 424         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<AcceptChannel, HandleError>;
 425         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>;
 426         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated) -> Result<FundingSigned, HandleError>;
 427         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned) -> Result<(), HandleError>;
 428         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked) -> Result<Option<AnnouncementSignatures>, HandleError>;
 429
 430         // Channl close:
 431         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown) -> Result<(Option<Shutdown>, Option<ClosingSigned>), HandleError>;
 432         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned) -> Result<Option<ClosingSigned>, HandleError>;
 433
 434         // HTLC handling:
 435         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC) -> Result<(), HandleError>;
 436         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC) -> Result<(), HandleError>;
 437         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC) -> Result<Option<HTLCFailChannelUpdate>, HandleError>;
 438         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC) -> Result<(), HandleError>;
 439         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned) -> Result<(RevokeAndACK, Option<CommitmentSigned>), HandleError>;
 440         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK) -> Result<Option<CommitmentUpdate>, HandleError>;
 441
 442         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee) -> Result<(), HandleError>;
 443
 444         // Channel-to-announce:
 445         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures) -> Result<(), HandleError>;
 446
 447         // Informational:
 448         /// Indicates a connection to the peer failed/an existing connection was lost. If no connection
 449         /// is believed to be possible in the future (eg they're sending us messages we don't
 450         /// understand or indicate they require unknown feature bits), no_connection_possible is set
 451         /// and any outstanding channels should be failed.
 452         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
 453 }
 454
 455 pub trait RoutingMessageHandler : Send + Sync {
 456         fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<(), HandleError>;
 457         /// Handle a channel_announcement message, returning true if it should be forwarded on, false
 458         /// or returning an Err otherwise.
 459         fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, HandleError>;
 460         fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<(), HandleError>;
 461         fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
 462 }
 463
 464 pub struct OnionRealm0HopData {
 465         pub short_channel_id: u64,
 466         pub amt_to_forward: u64,
 467         pub outgoing_cltv_value: u32,
 468         // 12 bytes of 0-padding
 469 }
 470
 471 pub struct OnionHopData {
 472         pub realm: u8,
 473         pub data: OnionRealm0HopData,
 474         pub hmac: [u8; 32],
 475 }
 476 unsafe impl internal_traits::NoDealloc for OnionHopData{}
 477
 478 #[derive(Clone)]
 479 pub struct OnionPacket {
 480         pub version: u8,
 481         pub public_key: PublicKey,
 482         pub hop_data: [u8; 20*65],
 483         pub hmac: [u8; 32],
 484 }
 485
 486 pub struct DecodedOnionErrorPacket {
 487         pub hmac: [u8; 32],
 488         pub failuremsg: Vec<u8>,
 489         pub pad: Vec<u8>,
 490 }
 491
 492 #[derive(Clone)]
 493 pub struct OnionErrorPacket {
 494         // This really should be a constant size slice, but the spec lets these things be up to 128KB?
 495         // (TODO) We limit it in decode to much lower...
 496         pub data: Vec<u8>,
 497 }
 498
 499 impl Error for DecodeError {
 500         fn description(&self) -> &str {
 501                 match *self {
 502                         DecodeError::UnknownRealmByte => "Unknown realm byte in Onion packet",
 503                         DecodeError::BadPublicKey => "Invalid public key in packet",
 504                         DecodeError::BadSignature => "Invalid signature in packet",
 505                         DecodeError::BadText => "Invalid text in packet",
 506                         DecodeError::ShortRead => "Packet extended beyond the provided bytes",
 507                         DecodeError::ExtraAddressesPerType => "More than one address of a single type",
 508                         DecodeError::BadLengthDescriptor => "A length descriptor in the packet didn't describe the later data correctly",
 509                 }
 510         }
 511 }
 512 impl fmt::Display for DecodeError {
 513         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 514                 f.write_str(self.description())
 515         }
 516 }
 517
 518 impl fmt::Debug for HandleError {
 519         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 520                 f.write_str(self.err)
 521         }
 522 }
 523
 524 macro_rules! secp_pubkey {
 525         ( $ctx: expr, $slice: expr ) => {
 526                 match PublicKey::from_slice($ctx, $slice) {
 527                         Ok(key) => key,
 528                         Err(_) => return Err(DecodeError::BadPublicKey)
 529                 }
 530         };
 531 }
 532
 533 macro_rules! secp_signature {
 534         ( $ctx: expr, $slice: expr ) => {
 535                 match Signature::from_compact($ctx, $slice) {
 536                         Ok(sig) => sig,
 537                         Err(_) => return Err(DecodeError::BadSignature)
 538                 }
 539         };
 540 }
 541
 542 impl MsgDecodable for LocalFeatures {
 543         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 544                 if v.len() < 2 { return Err(DecodeError::ShortRead); }
 545                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 546                 if v.len() < len + 2 { return Err(DecodeError::ShortRead); }
 547                 let mut flags = Vec::with_capacity(len);
 548                 flags.extend_from_slice(&v[2..2 + len]);
 549                 Ok(Self {
 550                         flags: flags
 551                 })
 552         }
 553 }
 554 impl MsgEncodable for LocalFeatures {
 555         fn encode(&self) -> Vec<u8> {
 556                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 557                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 558                 res.extend_from_slice(&self.flags[..]);
 559                 res
 560         }
 561         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 562 }
 563
 564 impl MsgDecodable for GlobalFeatures {
 565         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 566                 if v.len() < 2 { return Err(DecodeError::ShortRead); }
 567                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
 568                 if v.len() < len + 2 { return Err(DecodeError::ShortRead); }
 569                 let mut flags = Vec::with_capacity(len);
 570                 flags.extend_from_slice(&v[2..2 + len]);
 571                 Ok(Self {
 572                         flags: flags
 573                 })
 574         }
 575 }
 576 impl MsgEncodable for GlobalFeatures {
 577         fn encode(&self) -> Vec<u8> {
 578                 let mut res = Vec::with_capacity(self.flags.len() + 2);
 579                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags.len() as u16));
 580                 res.extend_from_slice(&self.flags[..]);
 581                 res
 582         }
 583         fn encoded_len(&self) -> usize { self.flags.len() + 2 }
 584 }
 585
 586 impl MsgDecodable for Init {
 587         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 588                 let global_features = GlobalFeatures::decode(v)?;
 589                 if v.len() < global_features.flags.len() + 4 {
 590                         return Err(DecodeError::ShortRead);
 591                 }
 592                 let local_features = LocalFeatures::decode(&v[global_features.flags.len() + 2..])?;
 593                 Ok(Self {
 594                         global_features: global_features,
 595                         local_features: local_features,
 596                 })
 597         }
 598 }
 599 impl MsgEncodable for Init {
 600         fn encode(&self) -> Vec<u8> {
 601                 let mut res = Vec::with_capacity(self.global_features.flags.len() + self.local_features.flags.len());
 602                 res.extend_from_slice(&self.global_features.encode()[..]);
 603                 res.extend_from_slice(&self.local_features.encode()[..]);
 604                 res
 605         }
 606 }
 607
 608 impl MsgDecodable for Ping {
 609         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 610                 if v.len() < 4 {
 611                         return Err(DecodeError::ShortRead);
 612                 }
 613                 let ponglen = byte_utils::slice_to_be16(&v[0..2]);
 614                 let byteslen = byte_utils::slice_to_be16(&v[2..4]);
 615                 if v.len() < 4 + byteslen as usize {
 616                         return Err(DecodeError::ShortRead);
 617                 }
 618                 Ok(Self {
 619                         ponglen,
 620                         byteslen,
 621                 })
 622         }
 623 }
 624 impl MsgEncodable for Ping {
 625         fn encode(&self) -> Vec<u8> {
 626                 let mut res = Vec::with_capacity(self.byteslen as usize + 2);
 627                 res.extend_from_slice(&byte_utils::be16_to_array(self.byteslen));
 628                 res.resize(2 + self.byteslen as usize, 0);
 629                 res
 630         }
 631 }
 632
 633 impl MsgDecodable for Pong {
 634         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 635                 if v.len() < 2 {
 636                         return Err(DecodeError::ShortRead);
 637                 }
 638                 let byteslen = byte_utils::slice_to_be16(&v[0..2]);
 639                 if v.len() < 2 + byteslen as usize {
 640                         return Err(DecodeError::ShortRead);
 641                 }
 642                 Ok(Self {
 643                         byteslen
 644                 })
 645         }
 646 }
 647 impl MsgEncodable for Pong {
 648         fn encode(&self) -> Vec<u8> {
 649                 let mut res = Vec::with_capacity(self.byteslen as usize + 2);
 650                 res.extend_from_slice(&byte_utils::be16_to_array(self.byteslen));
 651                 res.resize(2 + self.byteslen as usize, 0);
 652                 res
 653         }
 654 }
 655
 656 impl MsgDecodable for OpenChannel {
 657         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 658                 if v.len() < 2*32+6*8+4+2*2+6*33+1 {
 659                         return Err(DecodeError::ShortRead);
 660                 }
 661                 let ctx = Secp256k1::without_caps();
 662
 663                 let mut shutdown_scriptpubkey = None;
 664                 if v.len() >= 321 {
 665                         let len = byte_utils::slice_to_be16(&v[319..321]) as usize;
 666                         if v.len() < 321+len {
 667                                 return Err(DecodeError::ShortRead);
 668                         }
 669                         shutdown_scriptpubkey = Some(Script::from(v[321..321+len].to_vec()));
 670                 }
 671
 672                 Ok(OpenChannel {
 673                         chain_hash: deserialize(&v[0..32]).unwrap(),
 674                         temporary_channel_id: deserialize(&v[32..64]).unwrap(),
 675                         funding_satoshis: byte_utils::slice_to_be64(&v[64..72]),
 676                         push_msat: byte_utils::slice_to_be64(&v[72..80]),
 677                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[80..88]),
 678                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[88..96]),
 679                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[96..104]),
 680                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[104..112]),
 681                         feerate_per_kw: byte_utils::slice_to_be32(&v[112..116]),
 682                         to_self_delay: byte_utils::slice_to_be16(&v[116..118]),
 683                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[118..120]),
 684                         funding_pubkey: secp_pubkey!(&ctx, &v[120..153]),
 685                         revocation_basepoint: secp_pubkey!(&ctx, &v[153..186]),
 686                         payment_basepoint: secp_pubkey!(&ctx, &v[186..219]),
 687                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[219..252]),
 688                         htlc_basepoint: secp_pubkey!(&ctx, &v[252..285]),
 689                         first_per_commitment_point: secp_pubkey!(&ctx, &v[285..318]),
 690                         channel_flags: v[318],
 691                         shutdown_scriptpubkey: shutdown_scriptpubkey
 692                 })
 693         }
 694 }
 695 impl MsgEncodable for OpenChannel {
 696         fn encode(&self) -> Vec<u8> {
 697                 let mut res = match &self.shutdown_scriptpubkey {
 698                         &Some(ref script) => Vec::with_capacity(319 + 2 + script.len()),
 699                         &None => Vec::with_capacity(319),
 700                 };
 701                 res.extend_from_slice(&serialize(&self.chain_hash).unwrap());
 702                 res.extend_from_slice(&serialize(&self.temporary_channel_id).unwrap());
 703                 res.extend_from_slice(&byte_utils::be64_to_array(self.funding_satoshis));
 704                 res.extend_from_slice(&byte_utils::be64_to_array(self.push_msat));
 705                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 706                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 707                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 708                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 709                 res.extend_from_slice(&byte_utils::be32_to_array(self.feerate_per_kw));
 710                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 711                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 712                 res.extend_from_slice(&self.funding_pubkey.serialize());
 713                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 714                 res.extend_from_slice(&self.payment_basepoint.serialize());
 715                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 716                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 717                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 718                 res.push(self.channel_flags);
 719                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 720                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 721                         res.extend_from_slice(&script[..]);
 722                 }
 723                 res
 724         }
 725 }
 726
 727 impl MsgDecodable for AcceptChannel {
 728         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 729                 if v.len() < 32+4*8+4+2*2+6*33 {
 730                         return Err(DecodeError::ShortRead);
 731                 }
 732                 let ctx = Secp256k1::without_caps();
 733
 734                 let mut shutdown_scriptpubkey = None;
 735                 if v.len() >= 272 {
 736                         let len = byte_utils::slice_to_be16(&v[270..272]) as usize;
 737                         if v.len() < 272+len {
 738                                 return Err(DecodeError::ShortRead);
 739                         }
 740                         shutdown_scriptpubkey = Some(Script::from(v[272..272+len].to_vec()));
 741                 }
 742
 743                 let mut temporary_channel_id = [0; 32];
 744                 temporary_channel_id[..].copy_from_slice(&v[0..32]);
 745                 Ok(Self {
 746                         temporary_channel_id,
 747                         dust_limit_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 748                         max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[40..48]),
 749                         channel_reserve_satoshis: byte_utils::slice_to_be64(&v[48..56]),
 750                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[56..64]),
 751                         minimum_depth: byte_utils::slice_to_be32(&v[64..68]),
 752                         to_self_delay: byte_utils::slice_to_be16(&v[68..70]),
 753                         max_accepted_htlcs: byte_utils::slice_to_be16(&v[70..72]),
 754                         funding_pubkey: secp_pubkey!(&ctx, &v[72..105]),
 755                         revocation_basepoint: secp_pubkey!(&ctx, &v[105..138]),
 756                         payment_basepoint: secp_pubkey!(&ctx, &v[138..171]),
 757                         delayed_payment_basepoint: secp_pubkey!(&ctx, &v[171..204]),
 758                         htlc_basepoint: secp_pubkey!(&ctx, &v[204..237]),
 759                         first_per_commitment_point: secp_pubkey!(&ctx, &v[237..270]),
 760                         shutdown_scriptpubkey: shutdown_scriptpubkey
 761                 })
 762         }
 763 }
 764 impl MsgEncodable for AcceptChannel {
 765         fn encode(&self) -> Vec<u8> {
 766                 let mut res = match &self.shutdown_scriptpubkey {
 767                         &Some(ref script) => Vec::with_capacity(270 + 2 + script.len()),
 768                         &None => Vec::with_capacity(270),
 769                 };
 770                 res.extend_from_slice(&self.temporary_channel_id);
 771                 res.extend_from_slice(&byte_utils::be64_to_array(self.dust_limit_satoshis));
 772                 res.extend_from_slice(&byte_utils::be64_to_array(self.max_htlc_value_in_flight_msat));
 773                 res.extend_from_slice(&byte_utils::be64_to_array(self.channel_reserve_satoshis));
 774                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
 775                 res.extend_from_slice(&byte_utils::be32_to_array(self.minimum_depth));
 776                 res.extend_from_slice(&byte_utils::be16_to_array(self.to_self_delay));
 777                 res.extend_from_slice(&byte_utils::be16_to_array(self.max_accepted_htlcs));
 778                 res.extend_from_slice(&self.funding_pubkey.serialize());
 779                 res.extend_from_slice(&self.revocation_basepoint.serialize());
 780                 res.extend_from_slice(&self.payment_basepoint.serialize());
 781                 res.extend_from_slice(&self.delayed_payment_basepoint.serialize());
 782                 res.extend_from_slice(&self.htlc_basepoint.serialize());
 783                 res.extend_from_slice(&self.first_per_commitment_point.serialize());
 784                 if let &Some(ref script) = &self.shutdown_scriptpubkey {
 785                         res.extend_from_slice(&byte_utils::be16_to_array(script.len() as u16));
 786                         res.extend_from_slice(&script[..]);
 787                 }
 788                 res
 789         }
 790 }
 791
 792 impl MsgDecodable for FundingCreated {
 793         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 794                 if v.len() < 32+32+2+64 {
 795                         return Err(DecodeError::ShortRead);
 796                 }
 797                 let ctx = Secp256k1::without_caps();
 798                 let mut temporary_channel_id = [0; 32];
 799                 temporary_channel_id[..].copy_from_slice(&v[0..32]);
 800                 Ok(Self {
 801                         temporary_channel_id,
 802                         funding_txid: deserialize(&v[32..64]).unwrap(),
 803                         funding_output_index: byte_utils::slice_to_be16(&v[64..66]),
 804                         signature: secp_signature!(&ctx, &v[66..130]),
 805                 })
 806         }
 807 }
 808 impl MsgEncodable for FundingCreated {
 809         fn encode(&self) -> Vec<u8> {
 810                 let mut res = Vec::with_capacity(32+32+2+64);
 811                 res.extend_from_slice(&self.temporary_channel_id);
 812                 res.extend_from_slice(&serialize(&self.funding_txid).unwrap()[..]);
 813                 res.extend_from_slice(&byte_utils::be16_to_array(self.funding_output_index));
 814                 let secp_ctx = Secp256k1::without_caps();
 815                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 816                 res
 817         }
 818 }
 819
 820 impl MsgDecodable for FundingSigned {
 821         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 822                 if v.len() < 32+64 {
 823                         return Err(DecodeError::ShortRead);
 824                 }
 825                 let ctx = Secp256k1::without_caps();
 826                 let mut channel_id = [0; 32];
 827                 channel_id[..].copy_from_slice(&v[0..32]);
 828                 Ok(Self {
 829                         channel_id,
 830                         signature: secp_signature!(&ctx, &v[32..96]),
 831                 })
 832         }
 833 }
 834 impl MsgEncodable for FundingSigned {
 835         fn encode(&self) -> Vec<u8> {
 836                 let mut res = Vec::with_capacity(32+64);
 837                 res.extend_from_slice(&self.channel_id);
 838                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps()));
 839                 res
 840         }
 841 }
 842
 843 impl MsgDecodable for FundingLocked {
 844         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 845                 if v.len() < 32+33 {
 846                         return Err(DecodeError::ShortRead);
 847                 }
 848                 let ctx = Secp256k1::without_caps();
 849                 let mut channel_id = [0; 32];
 850                 channel_id[..].copy_from_slice(&v[0..32]);
 851                 Ok(Self {
 852                         channel_id,
 853                         next_per_commitment_point: secp_pubkey!(&ctx, &v[32..65]),
 854                 })
 855         }
 856 }
 857 impl MsgEncodable for FundingLocked {
 858         fn encode(&self) -> Vec<u8> {
 859                 let mut res = Vec::with_capacity(32+33);
 860                 res.extend_from_slice(&self.channel_id);
 861                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
 862                 res
 863         }
 864 }
 865
 866 impl MsgDecodable for Shutdown {
 867         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 868                 if v.len() < 32 + 2 {
 869                         return Err(DecodeError::ShortRead);
 870                 }
 871                 let scriptlen = byte_utils::slice_to_be16(&v[32..34]) as usize;
 872                 if v.len() < 32 + 2 + scriptlen {
 873                         return Err(DecodeError::ShortRead);
 874                 }
 875                 let mut channel_id = [0; 32];
 876                 channel_id[..].copy_from_slice(&v[0..32]);
 877                 Ok(Self {
 878                         channel_id,
 879                         scriptpubkey: Script::from(v[34..34 + scriptlen].to_vec()),
 880                 })
 881         }
 882 }
 883 impl MsgEncodable for Shutdown {
 884         fn encode(&self) -> Vec<u8> {
 885                 let mut res = Vec::with_capacity(32 + 2 + self.scriptpubkey.len());
 886                 res.extend_from_slice(&self.channel_id);
 887                 res.extend_from_slice(&byte_utils::be16_to_array(self.scriptpubkey.len() as u16));
 888                 res.extend_from_slice(&self.scriptpubkey[..]);
 889                 res
 890         }
 891 }
 892
 893 impl MsgDecodable for ClosingSigned {
 894         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 895                 if v.len() < 32 + 8 + 64 {
 896                         return Err(DecodeError::ShortRead);
 897                 }
 898                 let secp_ctx = Secp256k1::without_caps();
 899                 let mut channel_id = [0; 32];
 900                 channel_id[..].copy_from_slice(&v[0..32]);
 901                 Ok(Self {
 902                         channel_id,
 903                         fee_satoshis: byte_utils::slice_to_be64(&v[32..40]),
 904                         signature: secp_signature!(&secp_ctx, &v[40..104]),
 905                 })
 906         }
 907 }
 908 impl MsgEncodable for ClosingSigned {
 909         fn encode(&self) -> Vec<u8> {
 910                 let mut res = Vec::with_capacity(32+8+64);
 911                 res.extend_from_slice(&self.channel_id);
 912                 res.extend_from_slice(&byte_utils::be64_to_array(self.fee_satoshis));
 913                 let secp_ctx = Secp256k1::without_caps();
 914                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
 915                 res
 916         }
 917 }
 918
 919 impl MsgDecodable for UpdateAddHTLC {
 920         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 921                 if v.len() < 32+8+8+32+4+1+33+20*65+32 {
 922                         return Err(DecodeError::ShortRead);
 923                 }
 924                 let mut channel_id = [0; 32];
 925                 channel_id[..].copy_from_slice(&v[0..32]);
 926                 let mut payment_hash = [0; 32];
 927                 payment_hash.copy_from_slice(&v[48..80]);
 928                 Ok(Self{
 929                         channel_id,
 930                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 931                         amount_msat: byte_utils::slice_to_be64(&v[40..48]),
 932                         payment_hash,
 933                         cltv_expiry: byte_utils::slice_to_be32(&v[80..84]),
 934                         onion_routing_packet: OnionPacket::decode(&v[84..84+1366])?,
 935                 })
 936         }
 937 }
 938 impl MsgEncodable for UpdateAddHTLC {
 939         fn encode(&self) -> Vec<u8> {
 940                 let mut res = Vec::with_capacity(32+8+8+32+4+1+1366);
 941                 res.extend_from_slice(&self.channel_id);
 942                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 943                 res.extend_from_slice(&byte_utils::be64_to_array(self.amount_msat));
 944                 res.extend_from_slice(&self.payment_hash);
 945                 res.extend_from_slice(&byte_utils::be32_to_array(self.cltv_expiry));
 946                 res.extend_from_slice(&self.onion_routing_packet.encode()[..]);
 947                 res
 948         }
 949 }
 950
 951 impl MsgDecodable for UpdateFulfillHTLC {
 952         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 953                 if v.len() < 32+8+32 {
 954                         return Err(DecodeError::ShortRead);
 955                 }
 956                 let mut channel_id = [0; 32];
 957                 channel_id[..].copy_from_slice(&v[0..32]);
 958                 let mut payment_preimage = [0; 32];
 959                 payment_preimage.copy_from_slice(&v[40..72]);
 960                 Ok(Self{
 961                         channel_id,
 962                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 963                         payment_preimage,
 964                 })
 965         }
 966 }
 967 impl MsgEncodable for UpdateFulfillHTLC {
 968         fn encode(&self) -> Vec<u8> {
 969                 let mut res = Vec::with_capacity(32+8+32);
 970                 res.extend_from_slice(&self.channel_id);
 971                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 972                 res.extend_from_slice(&self.payment_preimage);
 973                 res
 974         }
 975 }
 976
 977 impl MsgDecodable for UpdateFailHTLC {
 978         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 979                 if v.len() < 32+8 {
 980                         return Err(DecodeError::ShortRead);
 981                 }
 982                 let mut channel_id = [0; 32];
 983                 channel_id[..].copy_from_slice(&v[0..32]);
 984                 Ok(Self{
 985                         channel_id,
 986                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
 987                         reason: OnionErrorPacket::decode(&v[40..])?,
 988                 })
 989         }
 990 }
 991 impl MsgEncodable for UpdateFailHTLC {
 992         fn encode(&self) -> Vec<u8> {
 993                 let reason = self.reason.encode();
 994                 let mut res = Vec::with_capacity(32+8+reason.len());
 995                 res.extend_from_slice(&self.channel_id);
 996                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
 997                 res.extend_from_slice(&reason[..]);
 998                 res
 999         }
1000 }
1001
1002 impl MsgDecodable for UpdateFailMalformedHTLC {
1003         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1004                 if v.len() < 32+8+32+2 {
1005                         return Err(DecodeError::ShortRead);
1006                 }
1007                 let mut channel_id = [0; 32];
1008                 channel_id[..].copy_from_slice(&v[0..32]);
1009                 let mut sha256_of_onion = [0; 32];
1010                 sha256_of_onion.copy_from_slice(&v[40..72]);
1011                 Ok(Self{
1012                         channel_id,
1013                         htlc_id: byte_utils::slice_to_be64(&v[32..40]),
1014                         sha256_of_onion,
1015                         failure_code: byte_utils::slice_to_be16(&v[72..74]),
1016                 })
1017         }
1018 }
1019 impl MsgEncodable for UpdateFailMalformedHTLC {
1020         fn encode(&self) -> Vec<u8> {
1021                 let mut res = Vec::with_capacity(32+8+32+2);
1022                 res.extend_from_slice(&self.channel_id);
1023                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_id));
1024                 res.extend_from_slice(&self.sha256_of_onion);
1025                 res.extend_from_slice(&byte_utils::be16_to_array(self.failure_code));
1026                 res
1027         }
1028 }
1029
1030 impl MsgDecodable for CommitmentSigned {
1031         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1032                 if v.len() < 32+64+2 {
1033                         return Err(DecodeError::ShortRead);
1034                 }
1035                 let mut channel_id = [0; 32];
1036                 channel_id[..].copy_from_slice(&v[0..32]);
1037
1038                 let htlcs = byte_utils::slice_to_be16(&v[96..98]) as usize;
1039                 if v.len() < 32+64+2+htlcs*64 {
1040                         return Err(DecodeError::ShortRead);
1041                 }
1042                 let mut htlc_signatures = Vec::with_capacity(htlcs);
1043                 let secp_ctx = Secp256k1::without_caps();
1044                 for i in 0..htlcs {
1045                         htlc_signatures.push(secp_signature!(&secp_ctx, &v[98+i*64..98+(i+1)*64]));
1046                 }
1047                 Ok(Self {
1048                         channel_id,
1049                         signature: secp_signature!(&secp_ctx, &v[32..96]),
1050                         htlc_signatures,
1051                 })
1052         }
1053 }
1054 impl MsgEncodable for CommitmentSigned {
1055         fn encode(&self) -> Vec<u8> {
1056                 let mut res = Vec::with_capacity(32+64+2+self.htlc_signatures.len()*64);
1057                 res.extend_from_slice(&self.channel_id);
1058                 let secp_ctx = Secp256k1::without_caps();
1059                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
1060                 res.extend_from_slice(&byte_utils::be16_to_array(self.htlc_signatures.len() as u16));
1061                 for i in 0..self.htlc_signatures.len() {
1062                         res.extend_from_slice(&self.htlc_signatures[i].serialize_compact(&secp_ctx));
1063                 }
1064                 res
1065         }
1066 }
1067
1068 impl MsgDecodable for RevokeAndACK {
1069         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1070                 if v.len() < 32+32+33 {
1071                         return Err(DecodeError::ShortRead);
1072                 }
1073                 let mut channel_id = [0; 32];
1074                 channel_id[..].copy_from_slice(&v[0..32]);
1075                 let mut per_commitment_secret = [0; 32];
1076                 per_commitment_secret.copy_from_slice(&v[32..64]);
1077                 let secp_ctx = Secp256k1::without_caps();
1078                 Ok(Self {
1079                         channel_id,
1080                         per_commitment_secret,
1081                         next_per_commitment_point: secp_pubkey!(&secp_ctx, &v[64..97]),
1082                 })
1083         }
1084 }
1085 impl MsgEncodable for RevokeAndACK {
1086         fn encode(&self) -> Vec<u8> {
1087                 let mut res = Vec::with_capacity(32+32+33);
1088                 res.extend_from_slice(&self.channel_id);
1089                 res.extend_from_slice(&self.per_commitment_secret);
1090                 res.extend_from_slice(&self.next_per_commitment_point.serialize());
1091                 res
1092         }
1093 }
1094
1095 impl MsgDecodable for UpdateFee {
1096         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1097                 if v.len() < 32+4 {
1098                         return Err(DecodeError::ShortRead);
1099                 }
1100                 let mut channel_id = [0; 32];
1101                 channel_id[..].copy_from_slice(&v[0..32]);
1102                 Ok(Self {
1103                         channel_id,
1104                         feerate_per_kw: byte_utils::slice_to_be32(&v[32..36]),
1105                 })
1106         }
1107 }
1108 impl MsgEncodable for UpdateFee {
1109         fn encode(&self) -> Vec<u8> {
1110                 let mut res = Vec::with_capacity(32+4);
1111                 res.extend_from_slice(&self.channel_id);
1112                 res.extend_from_slice(&byte_utils::be32_to_array(self.feerate_per_kw));
1113                 res
1114         }
1115 }
1116
1117 impl MsgDecodable for ChannelReestablish {
1118         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1119                 if v.len() < 32+2*8+33 {
1120                         return Err(DecodeError::ShortRead);
1121                 }
1122
1123                 let your_last_per_commitment_secret = if v.len() > 32+2*8+33 {
1124                         if v.len() < 32+2*8+33 + 32 {
1125                                 return Err(DecodeError::ShortRead);
1126                         }
1127                         let mut inner_array = [0; 32];
1128                         inner_array.copy_from_slice(&v[48..48+32]);
1129                         Some(inner_array)
1130                 } else { None };
1131
1132                 let option_size = match &your_last_per_commitment_secret {
1133                         &Some(ref _ary) => 32,
1134                         &None => 0,
1135                 };
1136                 Ok(Self {
1137                         channel_id: deserialize(&v[0..32]).unwrap(),
1138                         next_local_commitment_number: byte_utils::slice_to_be64(&v[32..40]),
1139                         next_remote_commitment_number: byte_utils::slice_to_be64(&v[40..48]),
1140                         your_last_per_commitment_secret: your_last_per_commitment_secret,
1141                         my_current_per_commitment_point: {
1142                                 let ctx = Secp256k1::without_caps();
1143                                 secp_pubkey!(&ctx, &v[48+option_size..48+option_size+33])
1144                         }
1145                 })
1146         }
1147 }
1148 impl MsgEncodable for ChannelReestablish {
1149         fn encode(&self) -> Vec<u8> {
1150                 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 });
1151
1152                 res.extend_from_slice(&serialize(&self.channel_id).unwrap()[..]);
1153                 res.extend_from_slice(&byte_utils::be64_to_array(self.next_local_commitment_number));
1154                 res.extend_from_slice(&byte_utils::be64_to_array(self.next_remote_commitment_number));
1155
1156                 if let &Some(ref ary) = &self.your_last_per_commitment_secret {
1157                         res.extend_from_slice(&ary[..]);
1158                 }
1159
1160                 res.extend_from_slice(&self.my_current_per_commitment_point.serialize());
1161                 res
1162         }
1163 }
1164
1165 impl MsgDecodable for AnnouncementSignatures {
1166         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1167                 if v.len() < 32+8+64*2 {
1168                         return Err(DecodeError::ShortRead);
1169                 }
1170                 let secp_ctx = Secp256k1::without_caps();
1171                 let mut channel_id = [0; 32];
1172                 channel_id[..].copy_from_slice(&v[0..32]);
1173                 Ok(Self {
1174                         channel_id,
1175                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1176                         node_signature: secp_signature!(&secp_ctx, &v[40..104]),
1177                         bitcoin_signature: secp_signature!(&secp_ctx, &v[104..168]),
1178                 })
1179         }
1180 }
1181 impl MsgEncodable for AnnouncementSignatures {
1182         fn encode(&self) -> Vec<u8> {
1183                 let mut res = Vec::with_capacity(32+8+64*2);
1184                 res.extend_from_slice(&self.channel_id);
1185                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1186                 let secp_ctx = Secp256k1::without_caps();
1187                 res.extend_from_slice(&self.node_signature.serialize_compact(&secp_ctx));
1188                 res.extend_from_slice(&self.bitcoin_signature.serialize_compact(&secp_ctx));
1189                 res
1190         }
1191 }
1192
1193 impl MsgDecodable for UnsignedNodeAnnouncement {
1194         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1195                 let features = GlobalFeatures::decode(&v[..])?;
1196                 if v.len() < features.encoded_len() + 4 + 33 + 3 + 32 + 2 {
1197                         return Err(DecodeError::ShortRead);
1198                 }
1199                 let start = features.encoded_len();
1200
1201                 let mut rgb = [0; 3];
1202                 rgb.copy_from_slice(&v[start + 37..start + 40]);
1203
1204                 let mut alias = [0; 32];
1205                 alias.copy_from_slice(&v[start + 40..start + 72]);
1206
1207                 let addrlen = byte_utils::slice_to_be16(&v[start + 72..start + 74]) as usize;
1208                 if v.len() < start + 74 + addrlen {
1209                         return Err(DecodeError::ShortRead);
1210                 }
1211                 let addr_read_limit = start + 74 + addrlen;
1212
1213                 let mut addresses = Vec::with_capacity(4);
1214                 let mut read_pos = start + 74;
1215                 loop {
1216                         if addr_read_limit <= read_pos { break; }
1217                         match v[read_pos] {
1218                                 0 => { read_pos += 1; },
1219                                 1 => {
1220                                         if addresses.len() > 0 {
1221                                                 return Err(DecodeError::ExtraAddressesPerType);
1222                                         }
1223                                         if addr_read_limit < read_pos + 1 + 6 {
1224                                                 return Err(DecodeError::BadLengthDescriptor);
1225                                         }
1226                                         let mut addr = [0; 4];
1227                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 5]);
1228                                         addresses.push(NetAddress::IPv4 {
1229                                                 addr,
1230                                                 port: byte_utils::slice_to_be16(&v[read_pos + 5..read_pos + 7]),
1231                                         });
1232                                         read_pos += 1 + 6;
1233                                 },
1234                                 2 => {
1235                                         if addresses.len() > 1 || (addresses.len() == 1 && addresses[0].get_id() != 1) {
1236                                                 return Err(DecodeError::ExtraAddressesPerType);
1237                                         }
1238                                         if addr_read_limit < read_pos + 1 + 18 {
1239                                                 return Err(DecodeError::BadLengthDescriptor);
1240                                         }
1241                                         let mut addr = [0; 16];
1242                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 17]);
1243                                         addresses.push(NetAddress::IPv6 {
1244                                                 addr,
1245                                                 port: byte_utils::slice_to_be16(&v[read_pos + 17..read_pos + 19]),
1246                                         });
1247                                         read_pos += 1 + 18;
1248                                 },
1249                                 3 => {
1250                                         if addresses.len() > 2 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 2) {
1251                                                 return Err(DecodeError::ExtraAddressesPerType);
1252                                         }
1253                                         if addr_read_limit < read_pos + 1 + 12 {
1254                                                 return Err(DecodeError::BadLengthDescriptor);
1255                                         }
1256                                         let mut addr = [0; 10];
1257                                         addr.copy_from_slice(&v[read_pos + 1..read_pos + 11]);
1258                                         addresses.push(NetAddress::OnionV2 {
1259                                                 addr,
1260                                                 port: byte_utils::slice_to_be16(&v[read_pos + 11..read_pos + 13]),
1261                                         });
1262                                         read_pos += 1 + 12;
1263                                 },
1264                                 4 => {
1265                                         if addresses.len() > 3 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 3) {
1266                                                 return Err(DecodeError::ExtraAddressesPerType);
1267                                         }
1268                                         if addr_read_limit < read_pos + 1 + 37 {
1269                                                 return Err(DecodeError::BadLengthDescriptor);
1270                                         }
1271                                         let mut ed25519_pubkey = [0; 32];
1272                                         ed25519_pubkey.copy_from_slice(&v[read_pos + 1..read_pos + 33]);
1273                                         addresses.push(NetAddress::OnionV3 {
1274                                                 ed25519_pubkey,
1275                                                 checksum: byte_utils::slice_to_be16(&v[read_pos + 33..read_pos + 35]),
1276                                                 version: v[read_pos + 35],
1277                                                 port: byte_utils::slice_to_be16(&v[read_pos + 36..read_pos + 38]),
1278                                         });
1279                                         read_pos += 1 + 37;
1280                                 },
1281                                 _ => { break; } // We've read all we can, we dont understand anything higher (and they're sorted)
1282                         }
1283                 }
1284
1285                 let secp_ctx = Secp256k1::without_caps();
1286                 Ok(Self {
1287                         features,
1288                         timestamp: byte_utils::slice_to_be32(&v[start..start + 4]),
1289                         node_id: secp_pubkey!(&secp_ctx, &v[start + 4..start + 37]),
1290                         rgb,
1291                         alias,
1292                         addresses,
1293                 })
1294         }
1295 }
1296 impl MsgEncodable for UnsignedNodeAnnouncement {
1297         fn encode(&self) -> Vec<u8> {
1298                 let features = self.features.encode();
1299                 let mut res = Vec::with_capacity(74 + features.len() + self.addresses.len());
1300                 res.extend_from_slice(&features[..]);
1301                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1302                 res.extend_from_slice(&self.node_id.serialize());
1303                 res.extend_from_slice(&self.rgb);
1304                 res.extend_from_slice(&self.alias);
1305                 let mut addr_slice = Vec::with_capacity(self.addresses.len() * 18);
1306                 let mut addrs_to_encode = self.addresses.clone();
1307                 addrs_to_encode.sort_unstable_by(|a, b| { a.get_id().cmp(&b.get_id()) });
1308                 addrs_to_encode.dedup_by(|a, b| { a.get_id() == b.get_id() });
1309                 for addr in addrs_to_encode.iter() {
1310                         match addr {
1311                                 &NetAddress::IPv4{addr, port} => {
1312                                         addr_slice.push(1);
1313                                         addr_slice.extend_from_slice(&addr);
1314                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1315                                 },
1316                                 &NetAddress::IPv6{addr, port} => {
1317                                         addr_slice.push(2);
1318                                         addr_slice.extend_from_slice(&addr);
1319                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1320                                 },
1321                                 &NetAddress::OnionV2{addr, port} => {
1322                                         addr_slice.push(3);
1323                                         addr_slice.extend_from_slice(&addr);
1324                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1325                                 },
1326                                 &NetAddress::OnionV3{ed25519_pubkey, checksum, version, port} => {
1327                                         addr_slice.push(4);
1328                                         addr_slice.extend_from_slice(&ed25519_pubkey);
1329                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(checksum));
1330                                         addr_slice.push(version);
1331                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1332                                 },
1333                         }
1334                 }
1335                 res.extend_from_slice(&byte_utils::be16_to_array(addr_slice.len() as u16));
1336                 res.extend_from_slice(&addr_slice[..]);
1337                 res
1338         }
1339 }
1340
1341 impl MsgDecodable for NodeAnnouncement {
1342         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1343                 if v.len() < 64 {
1344                         return Err(DecodeError::ShortRead);
1345                 }
1346                 let secp_ctx = Secp256k1::without_caps();
1347                 Ok(Self {
1348                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1349                         contents: UnsignedNodeAnnouncement::decode(&v[64..])?,
1350                 })
1351         }
1352 }
1353 impl MsgEncodable for NodeAnnouncement {
1354         fn encode(&self) -> Vec<u8> {
1355                 let contents = self.contents.encode();
1356                 let mut res = Vec::with_capacity(64 + contents.len());
1357                 let secp_ctx = Secp256k1::without_caps();
1358                 res.extend_from_slice(&self.signature.serialize_compact(&secp_ctx));
1359                 res.extend_from_slice(&contents);
1360                 res
1361         }
1362 }
1363
1364 impl MsgDecodable for UnsignedChannelAnnouncement {
1365         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1366                 let features = GlobalFeatures::decode(&v[..])?;
1367                 if v.len() < features.encoded_len() + 32 + 8 + 33*4 {
1368                         return Err(DecodeError::ShortRead);
1369                 }
1370                 let start = features.encoded_len();
1371                 let secp_ctx = Secp256k1::without_caps();
1372                 Ok(Self {
1373                         features,
1374                         chain_hash: deserialize(&v[start..start + 32]).unwrap(),
1375                         short_channel_id: byte_utils::slice_to_be64(&v[start + 32..start + 40]),
1376                         node_id_1: secp_pubkey!(&secp_ctx, &v[start + 40..start + 73]),
1377                         node_id_2: secp_pubkey!(&secp_ctx, &v[start + 73..start + 106]),
1378                         bitcoin_key_1: secp_pubkey!(&secp_ctx, &v[start + 106..start + 139]),
1379                         bitcoin_key_2: secp_pubkey!(&secp_ctx, &v[start + 139..start + 172]),
1380                 })
1381         }
1382 }
1383 impl MsgEncodable for UnsignedChannelAnnouncement {
1384         fn encode(&self) -> Vec<u8> {
1385                 let features = self.features.encode();
1386                 let mut res = Vec::with_capacity(172 + features.len());
1387                 res.extend_from_slice(&features[..]);
1388                 res.extend_from_slice(&self.chain_hash[..]);
1389                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1390                 res.extend_from_slice(&self.node_id_1.serialize());
1391                 res.extend_from_slice(&self.node_id_2.serialize());
1392                 res.extend_from_slice(&self.bitcoin_key_1.serialize());
1393                 res.extend_from_slice(&self.bitcoin_key_2.serialize());
1394                 res
1395         }
1396 }
1397
1398 impl MsgDecodable for ChannelAnnouncement {
1399         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1400                 if v.len() < 64*4 {
1401                         return Err(DecodeError::ShortRead);
1402                 }
1403                 let secp_ctx = Secp256k1::without_caps();
1404                 Ok(Self {
1405                         node_signature_1: secp_signature!(&secp_ctx, &v[0..64]),
1406                         node_signature_2: secp_signature!(&secp_ctx, &v[64..128]),
1407                         bitcoin_signature_1: secp_signature!(&secp_ctx, &v[128..192]),
1408                         bitcoin_signature_2: secp_signature!(&secp_ctx, &v[192..256]),
1409                         contents: UnsignedChannelAnnouncement::decode(&v[256..])?,
1410                 })
1411         }
1412 }
1413 impl MsgEncodable for ChannelAnnouncement {
1414         fn encode(&self) -> Vec<u8> {
1415                 let secp_ctx = Secp256k1::without_caps();
1416                 let contents = self.contents.encode();
1417                 let mut res = Vec::with_capacity(64 + contents.len());
1418                 res.extend_from_slice(&self.node_signature_1.serialize_compact(&secp_ctx));
1419                 res.extend_from_slice(&self.node_signature_2.serialize_compact(&secp_ctx));
1420                 res.extend_from_slice(&self.bitcoin_signature_1.serialize_compact(&secp_ctx));
1421                 res.extend_from_slice(&self.bitcoin_signature_2.serialize_compact(&secp_ctx));
1422                 res.extend_from_slice(&contents);
1423                 res
1424         }
1425 }
1426
1427 impl MsgDecodable for UnsignedChannelUpdate {
1428         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1429                 if v.len() < 32+8+4+2+2+8+4+4 {
1430                         return Err(DecodeError::ShortRead);
1431                 }
1432                 Ok(Self {
1433                         chain_hash: deserialize(&v[0..32]).unwrap(),
1434                         short_channel_id: byte_utils::slice_to_be64(&v[32..40]),
1435                         timestamp: byte_utils::slice_to_be32(&v[40..44]),
1436                         flags: byte_utils::slice_to_be16(&v[44..46]),
1437                         cltv_expiry_delta: byte_utils::slice_to_be16(&v[46..48]),
1438                         htlc_minimum_msat: byte_utils::slice_to_be64(&v[48..56]),
1439                         fee_base_msat: byte_utils::slice_to_be32(&v[56..60]),
1440                         fee_proportional_millionths: byte_utils::slice_to_be32(&v[60..64]),
1441                 })
1442         }
1443 }
1444 impl MsgEncodable for UnsignedChannelUpdate {
1445         fn encode(&self) -> Vec<u8> {
1446                 let mut res = Vec::with_capacity(64);
1447                 res.extend_from_slice(&self.chain_hash[..]);
1448                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1449                 res.extend_from_slice(&byte_utils::be32_to_array(self.timestamp));
1450                 res.extend_from_slice(&byte_utils::be16_to_array(self.flags));
1451                 res.extend_from_slice(&byte_utils::be16_to_array(self.cltv_expiry_delta));
1452                 res.extend_from_slice(&byte_utils::be64_to_array(self.htlc_minimum_msat));
1453                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_base_msat));
1454                 res.extend_from_slice(&byte_utils::be32_to_array(self.fee_proportional_millionths));
1455                 res
1456         }
1457 }
1458
1459 impl MsgDecodable for ChannelUpdate {
1460         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1461                 if v.len() < 128 {
1462                         return Err(DecodeError::ShortRead);
1463                 }
1464                 let secp_ctx = Secp256k1::without_caps();
1465                 Ok(Self {
1466                         signature: secp_signature!(&secp_ctx, &v[0..64]),
1467                         contents: UnsignedChannelUpdate::decode(&v[64..])?,
1468                 })
1469         }
1470 }
1471 impl MsgEncodable for ChannelUpdate {
1472         fn encode(&self) -> Vec<u8> {
1473                 let mut res = Vec::with_capacity(128);
1474                 res.extend_from_slice(&self.signature.serialize_compact(&Secp256k1::without_caps())[..]);
1475                 res.extend_from_slice(&self.contents.encode()[..]);
1476                 res
1477         }
1478 }
1479
1480 impl MsgDecodable for OnionRealm0HopData {
1481         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1482                 if v.len() < 32 {
1483                         return Err(DecodeError::ShortRead);
1484                 }
1485                 Ok(OnionRealm0HopData {
1486                         short_channel_id: byte_utils::slice_to_be64(&v[0..8]),
1487                         amt_to_forward: byte_utils::slice_to_be64(&v[8..16]),
1488                         outgoing_cltv_value: byte_utils::slice_to_be32(&v[16..20]),
1489                 })
1490         }
1491 }
1492 impl MsgEncodable for OnionRealm0HopData {
1493         fn encode(&self) -> Vec<u8> {
1494                 let mut res = Vec::with_capacity(32);
1495                 res.extend_from_slice(&byte_utils::be64_to_array(self.short_channel_id));
1496                 res.extend_from_slice(&byte_utils::be64_to_array(self.amt_to_forward));
1497                 res.extend_from_slice(&byte_utils::be32_to_array(self.outgoing_cltv_value));
1498                 res.resize(32, 0);
1499                 res
1500         }
1501 }
1502
1503 impl MsgDecodable for OnionHopData {
1504         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1505                 if v.len() < 65 {
1506                         return Err(DecodeError::ShortRead);
1507                 }
1508                 let realm = v[0];
1509                 if realm != 0 {
1510                         return Err(DecodeError::UnknownRealmByte);
1511                 }
1512                 let mut hmac = [0; 32];
1513                 hmac[..].copy_from_slice(&v[33..65]);
1514                 Ok(OnionHopData {
1515                         realm: realm,
1516                         data: OnionRealm0HopData::decode(&v[1..33])?,
1517                         hmac: hmac,
1518                 })
1519         }
1520 }
1521 impl MsgEncodable for OnionHopData {
1522         fn encode(&self) -> Vec<u8> {
1523                 let mut res = Vec::with_capacity(65);
1524                 res.push(self.realm);
1525                 res.extend_from_slice(&self.data.encode()[..]);
1526                 res.extend_from_slice(&self.hmac);
1527                 res
1528         }
1529 }
1530
1531 impl MsgDecodable for OnionPacket {
1532         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1533                 if v.len() < 1+33+20*65+32 {
1534                         return Err(DecodeError::ShortRead);
1535                 }
1536                 let mut hop_data = [0; 20*65];
1537                 hop_data.copy_from_slice(&v[34..1334]);
1538                 let mut hmac = [0; 32];
1539                 hmac.copy_from_slice(&v[1334..1366]);
1540                 let secp_ctx = Secp256k1::without_caps();
1541                 Ok(Self {
1542                         version: v[0],
1543                         public_key: secp_pubkey!(&secp_ctx, &v[1..34]),
1544                         hop_data,
1545                         hmac,
1546                 })
1547         }
1548 }
1549 impl MsgEncodable for OnionPacket {
1550         fn encode(&self) -> Vec<u8> {
1551                 let mut res = Vec::with_capacity(1 + 33 + 20*65 + 32);
1552                 res.push(self.version);
1553                 res.extend_from_slice(&self.public_key.serialize());
1554                 res.extend_from_slice(&self.hop_data);
1555                 res.extend_from_slice(&self.hmac);
1556                 res
1557         }
1558 }
1559
1560 impl MsgDecodable for DecodedOnionErrorPacket {
1561         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1562                 if v.len() < 32 + 4 {
1563                         return Err(DecodeError::ShortRead);
1564                 }
1565                 let failuremsg_len = byte_utils::slice_to_be16(&v[32..34]) as usize;
1566                 if v.len() < 32 + 4 + failuremsg_len {
1567                         return Err(DecodeError::ShortRead);
1568                 }
1569                 let padding_len = byte_utils::slice_to_be16(&v[34 + failuremsg_len..]) as usize;
1570                 if v.len() < 32 + 4 + failuremsg_len + padding_len {
1571                         return Err(DecodeError::ShortRead);
1572                 }
1573
1574                 let mut hmac = [0; 32];
1575                 hmac.copy_from_slice(&v[0..32]);
1576                 Ok(Self {
1577                         hmac,
1578                         failuremsg: v[34..34 + failuremsg_len].to_vec(),
1579                         pad: v[36 + failuremsg_len..36 + failuremsg_len + padding_len].to_vec(),
1580                 })
1581         }
1582 }
1583 impl MsgEncodable for DecodedOnionErrorPacket {
1584         fn encode(&self) -> Vec<u8> {
1585                 let mut res = Vec::with_capacity(32 + 4 + self.failuremsg.len() + self.pad.len());
1586                 res.extend_from_slice(&self.hmac);
1587                 res.extend_from_slice(&[((self.failuremsg.len() >> 8) & 0xff) as u8, (self.failuremsg.len() & 0xff) as u8]);
1588                 res.extend_from_slice(&self.failuremsg);
1589                 res.extend_from_slice(&[((self.pad.len() >> 8) & 0xff) as u8, (self.pad.len() & 0xff) as u8]);
1590                 res.extend_from_slice(&self.pad);
1591                 res
1592         }
1593 }
1594
1595 impl MsgDecodable for OnionErrorPacket {
1596         fn decode(v: &[u8]) -> Result<Self, DecodeError> {
1597                 if v.len() < 2 {
1598                         return Err(DecodeError::ShortRead);
1599                 }
1600                 let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
1601                 if v.len() < 2 + len {
1602                         return Err(DecodeError::ShortRead);
1603                 }
1604                 Ok(Self {
1605                         data: v[2..len+2].to_vec(),
1606                 })
1607         }
1608 }
1609 impl MsgEncodable for OnionErrorPacket {
1610         fn encode(&self) -> Vec<u8> {
1611                 let mut res = Vec::with_capacity(2 + self.data.len());
1612                 res.extend_from_slice(&byte_utils::be16_to_array(self.data.len() as u16));
1613                 res.extend_from_slice(&self.data);
1614                 res
1615         }
1616 }
1617
1618 impl MsgEncodable for ErrorMessage {
1619         fn encode(&self) -> Vec<u8> {
1620                 let mut res = Vec::with_capacity(34 + self.data.len());
1621                 res.extend_from_slice(&self.channel_id);
1622                 res.extend_from_slice(&byte_utils::be16_to_array(self.data.len() as u16));
1623                 res.extend_from_slice(&self.data.as_bytes());
1624                 res
1625         }
1626 }
1627 impl MsgDecodable for ErrorMessage {
1628         fn decode(v: &[u8]) -> Result<Self,DecodeError> {
1629                 if v.len() < 34 {
1630                         return Err(DecodeError::ShortRead);
1631                 }
1632                 let len = byte_utils::slice_to_be16(&v[32..34]);
1633                 if v.len() < 34 + len as usize {
1634                         return Err(DecodeError::ShortRead);
1635                 }
1636                 let data = match String::from_utf8(v[34..34 + len as usize].to_vec()) {
1637                         Ok(s) => s,
1638                         Err(_) => return Err(DecodeError::BadText),
1639                 };
1640                 let mut channel_id = [0; 32];
1641                 channel_id[..].copy_from_slice(&v[0..32]);
1642                 Ok(Self {
1643                         channel_id,
1644                         data,
1645                 })
1646         }
1647 }
1648
1649 #[cfg(test)]
1650 mod tests {
1651         use hex;
1652         use ln::msgs::MsgEncodable;
1653         use ln::msgs;
1654         use secp256k1::key::{PublicKey,SecretKey};
1655         use secp256k1::Secp256k1;
1656
1657         #[test]
1658         fn encoding_channel_reestablish_no_secret() {
1659                 let public_key = {
1660                         let secp_ctx = Secp256k1::new();
1661                         PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap()).unwrap()
1662                 };
1663
1664                 let cr = msgs::ChannelReestablish {
1665                         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],
1666                         next_local_commitment_number: 3,
1667                         next_remote_commitment_number: 4,
1668                         your_last_per_commitment_secret: None,
1669                         my_current_per_commitment_point: public_key,
1670                 };
1671
1672                 let encoded_value = cr.encode();
1673                 assert_eq!(
1674                         encoded_value,
1675                         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]
1676                 );
1677         }
1678
1679         #[test]
1680         fn encoding_channel_reestablish_with_secret() {
1681                 let public_key = {
1682                         let secp_ctx = Secp256k1::new();
1683                         PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap()).unwrap()
1684                 };
1685
1686                 let cr = msgs::ChannelReestablish {
1687                         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],
1688                         next_local_commitment_number: 3,
1689                         next_remote_commitment_number: 4,
1690                         your_last_per_commitment_secret: Some([9; 32]),
1691                         my_current_per_commitment_point: public_key,
1692                 };
1693
1694                 let encoded_value = cr.encode();
1695                 assert_eq!(
1696                         encoded_value,
1697                         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]
1698                 );
1699         }
1700 }