From dde54beb3ff015eb903ecc7e9016abafbea671bf Mon Sep 17 00:00:00 2001
From: Ignotus Peverell <igno.peverell@protonmail.com>
Date: Mon, 6 Feb 2017 12:08:35 -0800
Subject: [PATCH] Hash needs to be writeable for network serialization.

---
 core/src/core/block.rs | 1 -
 core/src/core/hash.rs  | 9 +++++++--
 core/src/ser.rs        | 1 +
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/core/src/core/block.rs b/core/src/core/block.rs
index afdea2289..647c6dde8 100644
--- a/core/src/core/block.rs
+++ b/core/src/core/block.rs
@@ -125,7 +125,6 @@ impl Readable<BlockHeader> for BlockHeader {
 /// bitcoin's schedule) and expressed as a global transaction fee (added v.H),
 /// additive to the total of fees ever collected.
 pub struct Block {
-	// hash_mem: Hash,
 	pub header: BlockHeader,
 	pub inputs: Vec<Input>,
 	pub outputs: Vec<Output>,
diff --git a/core/src/core/hash.rs b/core/src/core/hash.rs
index 7987e7803..440c350ee 100644
--- a/core/src/core/hash.rs
+++ b/core/src/core/hash.rs
@@ -21,7 +21,7 @@ use byteorder::{ByteOrder, BigEndian};
 use std::fmt;
 use tiny_keccak::Keccak;
 
-use ser::{self, AsFixedBytes, Reader, Readable, Error};
+use ser::{self, AsFixedBytes, Reader, Readable, Writer, Writeable, Error};
 
 pub const ZERO_HASH: Hash = Hash([0; 32]);
 
@@ -50,7 +50,6 @@ impl Hash {
 	}
 }
 
-
 impl Readable<Hash> for Hash {
 	fn read(reader: &mut Reader) -> Result<Hash, ser::Error> {
 		let v = try!(reader.read_fixed_bytes(32));
@@ -62,6 +61,12 @@ impl Readable<Hash> for Hash {
 	}
 }
 
+impl Writeable for Hash {
+	fn write(&self, writer: &mut Writer) -> Result<(), Error> {
+		writer.write_fixed_bytes(&self.0)
+	}
+}
+
 /// Serializer that outputs a hash of the serialized object
 pub struct HashWriter {
 	state: Keccak,
diff --git a/core/src/ser.rs b/core/src/ser.rs
index 2c0be6017..f3ad6a0b6 100644
--- a/core/src/ser.rs
+++ b/core/src/ser.rs
@@ -327,6 +327,7 @@ impl_slice_bytes!([u8; 1]);
 impl_slice_bytes!([u8; 2]);
 impl_slice_bytes!([u8; 4]);
 impl_slice_bytes!([u8; 8]);
+impl_slice_bytes!([u8; 32]);
 
 impl<'a> AsFixedBytes for &'a [u8] {
 	fn as_fixed_bytes(&self) -> &[u8] {