From b455f557302ef694ef07020ec2dd9da11ca0f8b7 Mon Sep 17 00:00:00 2001
From: kimmylin <30611210+kimmylin@users.noreply.github.com>
Date: Mon, 26 Mar 2018 15:07:21 +0800
Subject: [PATCH] core: Modify Hash function for Istanbul header

---
 core/types/block.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/types/block.go b/core/types/block.go
index 92b868d9da..ab1716fdf0 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -100,6 +100,14 @@ type headerMarshaling struct {
 // Hash returns the block hash of the header, which is simply the keccak256 hash of its
 // RLP encoding.
 func (h *Header) Hash() common.Hash {
+	// If the mix digest is equivalent to the predefined Istanbul digest, use Istanbul
+	// specific hash calculation.
+	//if h.MixDigest == IstanbulDigest {
+	//	// Seal is reserved in extra-data. To prove block is signed by the proposer.
+	//	if istanbulHeader := IstanbulFilteredHeader(h, true); istanbulHeader != nil {
+	//		return rlpHash(istanbulHeader)
+	//	}
+	//}
 	return rlpHash(h)
 }