_ Git - rust-lightning/blob - lightning/src/util/ser.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! A very simple serialization framework which is used to serialize/deserialize messages as well
  11 //! as ChannelsManagers and ChannelMonitors.
  12
  13 use std::io::{Read, Write};
  14 use std::collections::HashMap;
  15 use core::hash::Hash;
  16 use std::sync::Mutex;
  17 use core::cmp;
  18
  19 use bitcoin::secp256k1::Signature;
  20 use bitcoin::secp256k1::key::{PublicKey, SecretKey};
  21 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
  22 use bitcoin::blockdata::script::Script;
  23 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
  24 use bitcoin::consensus;
  25 use bitcoin::consensus::Encodable;
  26 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
  27 use bitcoin::hash_types::{Txid, BlockHash};
  28 use core::marker::Sized;
  29 use ln::msgs::DecodeError;
  30 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
  31 use util::byte_utils;
  32
  33 use util::byte_utils::{be64_to_array, be48_to_array, be32_to_array, be16_to_array, slice_to_be16, slice_to_be32, slice_to_be48, slice_to_be64};
  34
  35 /// serialization buffer size
  36 pub const MAX_BUF_SIZE: usize = 64 * 1024;
  37
  38 /// A trait that is similar to std::io::Write but has one extra function which can be used to size
  39 /// buffers being written into.
  40 /// An impl is provided for any type that also impls std::io::Write which simply ignores size
  41 /// hints.
  42 ///
  43 /// (C-not exported) as we only export serialization to/from byte arrays instead
  44 pub trait Writer {
  45         /// Writes the given buf out. See std::io::Write::write_all for more
  46         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error>;
  47         /// Hints that data of the given size is about the be written. This may not always be called
  48         /// prior to data being written and may be safely ignored.
  49         fn size_hint(&mut self, size: usize);
  50 }
  51
  52 impl<W: Write> Writer for W {
  53         #[inline]
  54         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  55                 <Self as ::std::io::Write>::write_all(self, buf)
  56         }
  57         #[inline]
  58         fn size_hint(&mut self, _size: usize) { }
  59 }
  60
  61 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
  62 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
  63         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  64                 self.0.write_all(buf)
  65         }
  66         fn write(&mut self, buf: &[u8]) -> Result<usize, ::std::io::Error> {
  67                 self.0.write_all(buf)?;
  68                 Ok(buf.len())
  69         }
  70         fn flush(&mut self) -> Result<(), ::std::io::Error> {
  71                 Ok(())
  72         }
  73 }
  74
  75 pub(crate) struct VecWriter(pub Vec<u8>);
  76 impl Writer for VecWriter {
  77         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  78                 self.0.extend_from_slice(buf);
  79                 Ok(())
  80         }
  81         fn size_hint(&mut self, size: usize) {
  82                 self.0.reserve_exact(size);
  83         }
  84 }
  85
  86 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
  87 /// of some data when serialized but don't yet need the full data.
  88 pub(crate) struct LengthCalculatingWriter(pub usize);
  89 impl Writer for LengthCalculatingWriter {
  90         #[inline]
  91         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  92                 self.0 += buf.len();
  93                 Ok(())
  94         }
  95         #[inline]
  96         fn size_hint(&mut self, _size: usize) {}
  97 }
  98
  99 /// Essentially std::io::Take but a bit simpler and with a method to walk the underlying stream
 100 /// forward to ensure we always consume exactly the fixed length specified.
 101 pub(crate) struct FixedLengthReader<R: Read> {
 102         read: R,
 103         bytes_read: u64,
 104         total_bytes: u64,
 105 }
 106 impl<R: Read> FixedLengthReader<R> {
 107         pub fn new(read: R, total_bytes: u64) -> Self {
 108                 Self { read, bytes_read: 0, total_bytes }
 109         }
 110
 111         pub fn bytes_remain(&mut self) -> bool {
 112                 self.bytes_read != self.total_bytes
 113         }
 114
 115         pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
 116                 ::std::io::copy(self, &mut ::std::io::sink()).unwrap();
 117                 if self.bytes_read != self.total_bytes {
 118                         Err(DecodeError::ShortRead)
 119                 } else {
 120                         Ok(())
 121                 }
 122         }
 123 }
 124 impl<R: Read> Read for FixedLengthReader<R> {
 125         fn read(&mut self, dest: &mut [u8]) -> Result<usize, ::std::io::Error> {
 126                 if self.total_bytes == self.bytes_read {
 127                         Ok(0)
 128                 } else {
 129                         let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
 130                         match self.read.read(&mut dest[0..(read_len as usize)]) {
 131                                 Ok(v) => {
 132                                         self.bytes_read += v as u64;
 133                                         Ok(v)
 134                                 },
 135                                 Err(e) => Err(e),
 136                         }
 137                 }
 138         }
 139 }
 140
 141 /// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
 142 /// between "EOF reached before we started" and "EOF reached mid-read".
 143 pub(crate) struct ReadTrackingReader<R: Read> {
 144         read: R,
 145         pub have_read: bool,
 146 }
 147 impl<R: Read> ReadTrackingReader<R> {
 148         pub fn new(read: R) -> Self {
 149                 Self { read, have_read: false }
 150         }
 151 }
 152 impl<R: Read> Read for ReadTrackingReader<R> {
 153         fn read(&mut self, dest: &mut [u8]) -> Result<usize, ::std::io::Error> {
 154                 match self.read.read(dest) {
 155                         Ok(0) => Ok(0),
 156                         Ok(len) => {
 157                                 self.have_read = true;
 158                                 Ok(len)
 159                         },
 160                         Err(e) => Err(e),
 161                 }
 162         }
 163 }
 164
 165 /// A trait that various rust-lightning types implement allowing them to be written out to a Writer
 166 ///
 167 /// (C-not exported) as we only export serialization to/from byte arrays instead
 168 pub trait Writeable {
 169         /// Writes self out to the given Writer
 170         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error>;
 171
 172         /// Writes self out to a Vec<u8>
 173         fn encode(&self) -> Vec<u8> {
 174                 let mut msg = VecWriter(Vec::new());
 175                 self.write(&mut msg).unwrap();
 176                 msg.0
 177         }
 178
 179         /// Writes self out to a Vec<u8>
 180         fn encode_with_len(&self) -> Vec<u8> {
 181                 let mut msg = VecWriter(Vec::new());
 182                 0u16.write(&mut msg).unwrap();
 183                 self.write(&mut msg).unwrap();
 184                 let len = msg.0.len();
 185                 msg.0[..2].copy_from_slice(&byte_utils::be16_to_array(len as u16 - 2));
 186                 msg.0
 187         }
 188 }
 189
 190 impl<'a, T: Writeable> Writeable for &'a T {
 191         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> { (*self).write(writer) }
 192 }
 193
 194 /// A trait that various rust-lightning types implement allowing them to be read in from a Read
 195 ///
 196 /// (C-not exported) as we only export serialization to/from byte arrays instead
 197 pub trait Readable
 198         where Self: Sized
 199 {
 200         /// Reads a Self in from the given Read
 201         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
 202 }
 203
 204 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
 205 /// from a Read given some additional set of arguments which is required to deserialize.
 206 ///
 207 /// (C-not exported) as we only export serialization to/from byte arrays instead
 208 pub trait ReadableArgs<P>
 209         where Self: Sized
 210 {
 211         /// Reads a Self in from the given Read
 212         fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 213 }
 214
 215 /// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
 216 ///
 217 /// (C-not exported) as we only export serialization to/from byte arrays instead
 218 pub trait MaybeReadable
 219         where Self: Sized
 220 {
 221         /// Reads a Self in from the given Read
 222         fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
 223 }
 224
 225 pub(crate) struct OptionDeserWrapper<T: Readable>(pub Option<T>);
 226 impl<T: Readable> Readable for OptionDeserWrapper<T> {
 227         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
 228                 Ok(Self(Some(Readable::read(reader)?)))
 229         }
 230 }
 231
 232 const MAX_ALLOC_SIZE: u64 = 64*1024;
 233
 234 pub(crate) struct VecWriteWrapper<'a, T: Writeable>(pub &'a Vec<T>);
 235 impl<'a, T: Writeable> Writeable for VecWriteWrapper<'a, T> {
 236         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 237                 (self.0.len() as u64).write(writer)?;
 238                 for ref v in self.0.iter() {
 239                         v.write(writer)?;
 240                 }
 241                 Ok(())
 242         }
 243 }
 244 pub(crate) struct VecReadWrapper<T: Readable>(pub Vec<T>);
 245 impl<T: Readable> Readable for VecReadWrapper<T> {
 246         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
 247                 let count: u64 = Readable::read(reader)?;
 248                 let mut values = Vec::with_capacity(cmp::min(count, MAX_ALLOC_SIZE / (core::mem::size_of::<T>() as u64)) as usize);
 249                 for _ in 0..count {
 250                         match Readable::read(reader) {
 251                                 Ok(v) => { values.push(v); },
 252                                 Err(e) => return Err(e),
 253                         }
 254                 }
 255                 Ok(Self(values))
 256         }
 257 }
 258
 259 pub(crate) struct U48(pub u64);
 260 impl Writeable for U48 {
 261         #[inline]
 262         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 263                 writer.write_all(&be48_to_array(self.0))
 264         }
 265 }
 266 impl Readable for U48 {
 267         #[inline]
 268         fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
 269                 let mut buf = [0; 6];
 270                 reader.read_exact(&mut buf)?;
 271                 Ok(U48(slice_to_be48(&buf)))
 272         }
 273 }
 274
 275 /// Lightning TLV uses a custom variable-length integer called BigSize. It is similar to Bitcoin's
 276 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
 277 ///
 278 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
 279 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
 280 /// you're looking for an example of a variable-length integer to use for your own project, move
 281 /// along, this is a rather poor design.
 282 pub(crate) struct BigSize(pub u64);
 283 impl Writeable for BigSize {
 284         #[inline]
 285         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 286                 match self.0 {
 287                         0...0xFC => {
 288                                 (self.0 as u8).write(writer)
 289                         },
 290                         0xFD...0xFFFF => {
 291                                 0xFDu8.write(writer)?;
 292                                 (self.0 as u16).write(writer)
 293                         },
 294                         0x10000...0xFFFFFFFF => {
 295                                 0xFEu8.write(writer)?;
 296                                 (self.0 as u32).write(writer)
 297                         },
 298                         _ => {
 299                                 0xFFu8.write(writer)?;
 300                                 (self.0 as u64).write(writer)
 301                         },
 302                 }
 303         }
 304 }
 305 impl Readable for BigSize {
 306         #[inline]
 307         fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
 308                 let n: u8 = Readable::read(reader)?;
 309                 match n {
 310                         0xFF => {
 311                                 let x: u64 = Readable::read(reader)?;
 312                                 if x < 0x100000000 {
 313                                         Err(DecodeError::InvalidValue)
 314                                 } else {
 315                                         Ok(BigSize(x))
 316                                 }
 317                         }
 318                         0xFE => {
 319                                 let x: u32 = Readable::read(reader)?;
 320                                 if x < 0x10000 {
 321                                         Err(DecodeError::InvalidValue)
 322                                 } else {
 323                                         Ok(BigSize(x as u64))
 324                                 }
 325                         }
 326                         0xFD => {
 327                                 let x: u16 = Readable::read(reader)?;
 328                                 if x < 0xFD {
 329                                         Err(DecodeError::InvalidValue)
 330                                 } else {
 331                                         Ok(BigSize(x as u64))
 332                                 }
 333                         }
 334                         n => Ok(BigSize(n as u64))
 335                 }
 336         }
 337 }
 338
 339 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
 340 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
 341 /// encapsulates such integers implementing Readable/Writeable for them.
 342 #[cfg_attr(test, derive(PartialEq, Debug))]
 343 pub(crate) struct HighZeroBytesDroppedVarInt<T>(pub T);
 344
 345 macro_rules! impl_writeable_primitive {
 346         ($val_type:ty, $meth_write:ident, $len: expr, $meth_read:ident) => {
 347                 impl Writeable for $val_type {
 348                         #[inline]
 349                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 350                                 writer.write_all(&$meth_write(*self))
 351                         }
 352                 }
 353                 impl Writeable for HighZeroBytesDroppedVarInt<$val_type> {
 354                         #[inline]
 355                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 356                                 // Skip any full leading 0 bytes when writing (in BE):
 357                                 writer.write_all(&$meth_write(self.0)[(self.0.leading_zeros()/8) as usize..$len])
 358                         }
 359                 }
 360                 impl Readable for $val_type {
 361                         #[inline]
 362                         fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
 363                                 let mut buf = [0; $len];
 364                                 reader.read_exact(&mut buf)?;
 365                                 Ok($meth_read(&buf))
 366                         }
 367                 }
 368                 impl Readable for HighZeroBytesDroppedVarInt<$val_type> {
 369                         #[inline]
 370                         fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedVarInt<$val_type>, DecodeError> {
 371                                 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
 372                                 // the high bytes being dropped. To do so, we start reading into the middle of buf
 373                                 // and then convert the appropriate number of bytes with extra high bytes out of
 374                                 // buf.
 375                                 let mut buf = [0; $len*2];
 376                                 let mut read_len = reader.read(&mut buf[$len..])?;
 377                                 let mut total_read_len = read_len;
 378                                 while read_len != 0 && total_read_len != $len {
 379                                         read_len = reader.read(&mut buf[($len + total_read_len)..])?;
 380                                         total_read_len += read_len;
 381                                 }
 382                                 if total_read_len == 0 || buf[$len] != 0 {
 383                                         let first_byte = $len - ($len - total_read_len);
 384                                         Ok(HighZeroBytesDroppedVarInt($meth_read(&buf[first_byte..first_byte + $len])))
 385                                 } else {
 386                                         // If the encoding had extra zero bytes, return a failure even though we know
 387                                         // what they meant (as the TLV test vectors require this)
 388                                         Err(DecodeError::InvalidValue)
 389                                 }
 390                         }
 391                 }
 392         }
 393 }
 394
 395 impl_writeable_primitive!(u64, be64_to_array, 8, slice_to_be64);
 396 impl_writeable_primitive!(u32, be32_to_array, 4, slice_to_be32);
 397 impl_writeable_primitive!(u16, be16_to_array, 2, slice_to_be16);
 398
 399 impl Writeable for u8 {
 400         #[inline]
 401         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 402                 writer.write_all(&[*self])
 403         }
 404 }
 405 impl Readable for u8 {
 406         #[inline]
 407         fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
 408                 let mut buf = [0; 1];
 409                 reader.read_exact(&mut buf)?;
 410                 Ok(buf[0])
 411         }
 412 }
 413
 414 impl Writeable for bool {
 415         #[inline]
 416         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 417                 writer.write_all(&[if *self {1} else {0}])
 418         }
 419 }
 420 impl Readable for bool {
 421         #[inline]
 422         fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
 423                 let mut buf = [0; 1];
 424                 reader.read_exact(&mut buf)?;
 425                 if buf[0] != 0 && buf[0] != 1 {
 426                         return Err(DecodeError::InvalidValue);
 427                 }
 428                 Ok(buf[0] == 1)
 429         }
 430 }
 431
 432 // u8 arrays
 433 macro_rules! impl_array {
 434         ( $size:expr ) => (
 435                 impl Writeable for [u8; $size]
 436                 {
 437                         #[inline]
 438                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 439                                 w.write_all(self)
 440                         }
 441                 }
 442
 443                 impl Readable for [u8; $size]
 444                 {
 445                         #[inline]
 446                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 447                                 let mut buf = [0u8; $size];
 448                                 r.read_exact(&mut buf)?;
 449                                 Ok(buf)
 450                         }
 451                 }
 452         );
 453 }
 454
 455 //TODO: performance issue with [u8; size] with impl_array!()
 456 impl_array!(3); // for rgb
 457 impl_array!(4); // for IPv4
 458 impl_array!(10); // for OnionV2
 459 impl_array!(16); // for IPv6
 460 impl_array!(32); // for channel id & hmac
 461 impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
 462 impl_array!(COMPACT_SIGNATURE_SIZE); // for Signature
 463 impl_array!(1300); // for OnionPacket.hop_data
 464
 465 // HashMap
 466 impl<K, V> Writeable for HashMap<K, V>
 467         where K: Writeable + Eq + Hash,
 468               V: Writeable
 469 {
 470         #[inline]
 471         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 472         (self.len() as u16).write(w)?;
 473                 for (key, value) in self.iter() {
 474                         key.write(w)?;
 475                         value.write(w)?;
 476                 }
 477                 Ok(())
 478         }
 479 }
 480
 481 impl<K, V> Readable for HashMap<K, V>
 482         where K: Readable + Eq + Hash,
 483               V: Readable
 484 {
 485         #[inline]
 486         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 487                 let len: u16 = Readable::read(r)?;
 488                 let mut ret = HashMap::with_capacity(len as usize);
 489                 for _ in 0..len {
 490                         ret.insert(K::read(r)?, V::read(r)?);
 491                 }
 492                 Ok(ret)
 493         }
 494 }
 495
 496 // Vectors
 497 impl Writeable for Vec<u8> {
 498         #[inline]
 499         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 500                 (self.len() as u16).write(w)?;
 501                 w.write_all(&self)
 502         }
 503 }
 504
 505 impl Readable for Vec<u8> {
 506         #[inline]
 507         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 508                 let len: u16 = Readable::read(r)?;
 509                 let mut ret = Vec::with_capacity(len as usize);
 510                 ret.resize(len as usize, 0);
 511                 r.read_exact(&mut ret)?;
 512                 Ok(ret)
 513         }
 514 }
 515 impl Writeable for Vec<Signature> {
 516         #[inline]
 517         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 518                 (self.len() as u16).write(w)?;
 519                 for e in self.iter() {
 520                         e.write(w)?;
 521                 }
 522                 Ok(())
 523         }
 524 }
 525
 526 impl Readable for Vec<Signature> {
 527         #[inline]
 528         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 529                 let len: u16 = Readable::read(r)?;
 530                 let byte_size = (len as usize)
 531                                 .checked_mul(COMPACT_SIGNATURE_SIZE)
 532                                 .ok_or(DecodeError::BadLengthDescriptor)?;
 533                 if byte_size > MAX_BUF_SIZE {
 534                         return Err(DecodeError::BadLengthDescriptor);
 535                 }
 536                 let mut ret = Vec::with_capacity(len as usize);
 537                 for _ in 0..len { ret.push(Signature::read(r)?); }
 538                 Ok(ret)
 539         }
 540 }
 541
 542 impl Writeable for Script {
 543         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 544                 (self.len() as u16).write(w)?;
 545                 w.write_all(self.as_bytes())
 546         }
 547 }
 548
 549 impl Readable for Script {
 550         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 551                 let len = <u16 as Readable>::read(r)? as usize;
 552                 let mut buf = vec![0; len];
 553                 r.read_exact(&mut buf)?;
 554                 Ok(Script::from(buf))
 555         }
 556 }
 557
 558 impl Writeable for PublicKey {
 559         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 560                 self.serialize().write(w)
 561         }
 562 }
 563
 564 impl Readable for PublicKey {
 565         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 566                 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
 567                 match PublicKey::from_slice(&buf) {
 568                         Ok(key) => Ok(key),
 569                         Err(_) => return Err(DecodeError::InvalidValue),
 570                 }
 571         }
 572 }
 573
 574 impl Writeable for SecretKey {
 575         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 576                 let mut ser = [0; 32];
 577                 ser.copy_from_slice(&self[..]);
 578                 ser.write(w)
 579         }
 580 }
 581
 582 impl Readable for SecretKey {
 583         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 584                 let buf: [u8; 32] = Readable::read(r)?;
 585                 match SecretKey::from_slice(&buf) {
 586                         Ok(key) => Ok(key),
 587                         Err(_) => return Err(DecodeError::InvalidValue),
 588                 }
 589         }
 590 }
 591
 592 impl Writeable for Sha256dHash {
 593         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 594                 w.write_all(&self[..])
 595         }
 596 }
 597
 598 impl Readable for Sha256dHash {
 599         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 600                 use bitcoin::hashes::Hash;
 601
 602                 let buf: [u8; 32] = Readable::read(r)?;
 603                 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
 604         }
 605 }
 606
 607 impl Writeable for Signature {
 608         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 609                 self.serialize_compact().write(w)
 610         }
 611 }
 612
 613 impl Readable for Signature {
 614         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 615                 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
 616                 match Signature::from_compact(&buf) {
 617                         Ok(sig) => Ok(sig),
 618                         Err(_) => return Err(DecodeError::InvalidValue),
 619                 }
 620         }
 621 }
 622
 623 impl Writeable for PaymentPreimage {
 624         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 625                 self.0.write(w)
 626         }
 627 }
 628
 629 impl Readable for PaymentPreimage {
 630         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 631                 let buf: [u8; 32] = Readable::read(r)?;
 632                 Ok(PaymentPreimage(buf))
 633         }
 634 }
 635
 636 impl Writeable for PaymentHash {
 637         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 638                 self.0.write(w)
 639         }
 640 }
 641
 642 impl Readable for PaymentHash {
 643         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 644                 let buf: [u8; 32] = Readable::read(r)?;
 645                 Ok(PaymentHash(buf))
 646         }
 647 }
 648
 649 impl Writeable for PaymentSecret {
 650         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 651                 self.0.write(w)
 652         }
 653 }
 654
 655 impl Readable for PaymentSecret {
 656         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 657                 let buf: [u8; 32] = Readable::read(r)?;
 658                 Ok(PaymentSecret(buf))
 659         }
 660 }
 661
 662 impl<T: Writeable> Writeable for Option<T> {
 663         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 664                 match *self {
 665                         None => 0u8.write(w)?,
 666                         Some(ref data) => {
 667                                 let mut len_calc = LengthCalculatingWriter(0);
 668                                 data.write(&mut len_calc).expect("No in-memory data may fail to serialize");
 669                                 BigSize(len_calc.0 as u64 + 1).write(w)?;
 670                                 data.write(w)?;
 671                         }
 672                 }
 673                 Ok(())
 674         }
 675 }
 676
 677 impl<T: Readable> Readable for Option<T>
 678 {
 679         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 680                 match BigSize::read(r)?.0 {
 681                         0 => Ok(None),
 682                         len => {
 683                                 let mut reader = FixedLengthReader::new(r, len - 1);
 684                                 Ok(Some(Readable::read(&mut reader)?))
 685                         }
 686                 }
 687         }
 688 }
 689
 690 impl Writeable for Txid {
 691         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 692                 w.write_all(&self[..])
 693         }
 694 }
 695
 696 impl Readable for Txid {
 697         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 698                 use bitcoin::hashes::Hash;
 699
 700                 let buf: [u8; 32] = Readable::read(r)?;
 701                 Ok(Txid::from_slice(&buf[..]).unwrap())
 702         }
 703 }
 704
 705 impl Writeable for BlockHash {
 706         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 707                 w.write_all(&self[..])
 708         }
 709 }
 710
 711 impl Readable for BlockHash {
 712         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 713                 use bitcoin::hashes::Hash;
 714
 715                 let buf: [u8; 32] = Readable::read(r)?;
 716                 Ok(BlockHash::from_slice(&buf[..]).unwrap())
 717         }
 718 }
 719
 720 impl Writeable for OutPoint {
 721         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 722                 self.txid.write(w)?;
 723                 self.vout.write(w)?;
 724                 Ok(())
 725         }
 726 }
 727
 728 impl Readable for OutPoint {
 729         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 730                 let txid = Readable::read(r)?;
 731                 let vout = Readable::read(r)?;
 732                 Ok(OutPoint {
 733                         txid,
 734                         vout,
 735                 })
 736         }
 737 }
 738
 739 macro_rules! impl_consensus_ser {
 740         ($bitcoin_type: ty) => {
 741                 impl Writeable for $bitcoin_type {
 742                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 743                                 match self.consensus_encode(WriterWriteAdaptor(writer)) {
 744                                         Ok(_) => Ok(()),
 745                                         Err(e) => Err(e),
 746                                 }
 747                         }
 748                 }
 749
 750                 impl Readable for $bitcoin_type {
 751                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 752                                 match consensus::encode::Decodable::consensus_decode(r) {
 753                                         Ok(t) => Ok(t),
 754                                         Err(consensus::encode::Error::Io(ref e)) if e.kind() == ::std::io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
 755                                         Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
 756                                         Err(_) => Err(DecodeError::InvalidValue),
 757                                 }
 758                         }
 759                 }
 760         }
 761 }
 762 impl_consensus_ser!(Transaction);
 763 impl_consensus_ser!(TxOut);
 764
 765 impl<T: Readable> Readable for Mutex<T> {
 766         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 767                 let t: T = Readable::read(r)?;
 768                 Ok(Mutex::new(t))
 769         }
 770 }
 771 impl<T: Writeable> Writeable for Mutex<T> {
 772         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 773                 self.lock().unwrap().write(w)
 774         }
 775 }
 776
 777 impl<A: Readable, B: Readable> Readable for (A, B) {
 778         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 779                 let a: A = Readable::read(r)?;
 780                 let b: B = Readable::read(r)?;
 781                 Ok((a, b))
 782         }
 783 }
 784 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
 785         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 786                 self.0.write(w)?;
 787                 self.1.write(w)
 788         }
 789 }