From 1bb314f767785fe617c3c5efeca1a64127339506 Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Tue, 4 Aug 2020 10:47:20 -0400
Subject: include extra block data into hash calculation

---
 core/types/block.go    |  4 ++++
 examples/block/main.go | 13 ++++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/core/types/block.go b/core/types/block.go
index 6fa710a..b3dbcd3 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -85,6 +85,7 @@ type Header struct {
 	Extra       []byte         `json:"extraData"        gencodec:"required"`
 	MixDigest   common.Hash    `json:"mixHash"`
 	Nonce       BlockNonce     `json:"nonce"`
+	ExtDataHash common.Hash    `json:"extDataHash"		gencodec:"required"`
 }
 
 // field type overrides for gencodec
@@ -288,12 +289,15 @@ func (b *Block) DecodeRLP(s *rlp.Stream) error {
 		b.header, b.uncles, b.transactions = eb.Header, eb.Uncles, eb.Txs
 		b.extdata = nil
 	}
+	b.hash = atomic.Value{}
 	b.size.Store(common.StorageSize(rlp.ListSize(size)))
 	return nil
 }
 
 func (b *Block) SetExtraData(data []byte) {
 	b.extdata = data
+	b.header.ExtDataHash = rlpHash(data)
+	b.hash = atomic.Value{}
 }
 
 func (b *Block) ExtraData() []byte {
diff --git a/examples/block/main.go b/examples/block/main.go
index e5349e0..45d7586 100644
--- a/examples/block/main.go
+++ b/examples/block/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"crypto/rand"
 	"fmt"
 	"github.com/ava-labs/coreth"
 	"github.com/ava-labs/coreth/core"
@@ -11,6 +10,7 @@ import (
 	"github.com/ava-labs/coreth/params"
 	"github.com/ava-labs/go-ethereum/common"
 	"github.com/ava-labs/go-ethereum/common/hexutil"
+	"github.com/ava-labs/go-ethereum/crypto"
 	"github.com/ava-labs/go-ethereum/rlp"
 	"math/big"
 )
@@ -43,7 +43,9 @@ func main() {
 
 	// configure the genesis block
 	genBalance := big.NewInt(100000000000000000)
-	genKey, _ := coreth.NewKey(rand.Reader)
+	hk, _ := crypto.HexToECDSA(
+		"abd71b35d559563fea757f0f5edbde286fb8c043105b15abb7cd57189306d7d1")
+	genKey := coreth.NewKeyFromECDSA(hk)
 
 	config.Genesis = &core.Genesis{
 		Config:     chainConfig,
@@ -108,11 +110,11 @@ func main() {
 	checkError(err)
 	buff.WriteString("somesuffix")
 	fmt.Println(buff.Len())
-	fmt.Println(common.ToHex(buff.Bytes()))
+	fmt.Println(blk2.Hash().Hex())
 
 	err = rlp.Decode(buff, blk2)
-	fmt.Println(buff.Len(), (string)(blk2.ExtraData()))
 	checkError(err)
+	fmt.Println(buff.Len(), (string)(blk2.ExtraData()), blk2.Hash().Hex())
 	decoded1 := new(string)
 	err = rlp.DecodeBytes(blk2.ExtraData(), decoded1)
 	checkError(err)
@@ -138,11 +140,12 @@ func main() {
 	blk2.SetExtraData(extra)
 	err = blk2.EncodeRLPTest(buff, 0xfffffffe)
 	checkError(err)
+	fmt.Println(blk2.Hash().Hex())
 	err = rlp.Decode(buff, blk2)
 	checkError(err)
 	decoded2 := new(MyData)
 	err = rlp.DecodeBytes(blk2.ExtraData(), decoded2)
 	checkError(err)
-	fmt.Println(buff.Len(), decoded2)
+	fmt.Println(buff.Len(), decoded2, blk2.Hash().Hex())
 	buff.Reset()
 }
-- 
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