From 67fc0377e13416d9a1f8ea32e7d1b0ca89374bf3 Mon Sep 17 00:00:00 2001
From: Elad <theman@elad.im>
Date: Wed, 27 Mar 2019 22:07:03 +0900
Subject: [PATCH] contracts/ens: revert bmt to keccak256 (#19323)

* contracts/ens: revert bmt to keccak256

* contracts/ens: fix keccak256 hash code comment
---
 contracts/ens/cid.go      | 6 +++---
 contracts/ens/cid_test.go | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/contracts/ens/cid.go b/contracts/ens/cid.go
index fae9bfd0a..673e8203e 100644
--- a/contracts/ens/cid.go
+++ b/contracts/ens/cid.go
@@ -30,8 +30,8 @@ const (
 	nsIpfs  = 0xe3
 	nsSwarm = 0xe4
 
-	swarmTypecode = 0xfa //swarm manifest, see https://github.com/multiformats/multicodec/blob/master/table.csv
-	swarmHashtype = 0xd6 // BMT, see https://github.com/multiformats/multicodec/blob/master/table.csv
+	swarmTypecode = 0xfa // swarm manifest, see https://github.com/multiformats/multicodec/blob/master/table.csv
+	swarmHashtype = 0x1b // keccak256, see https://github.com/multiformats/multicodec/blob/master/table.csv
 
 	hashLength = 32
 )
@@ -106,7 +106,7 @@ func EncodeSwarmHash(hash common.Hash) ([]byte, error) {
 		nsSwarm,       //swarm namespace
 		cidv1,         // CIDv1
 		swarmTypecode, // swarm hash
-		swarmHashtype, // swarm bmt hash
+		swarmHashtype, // keccak256 hash
 		hashLength,    //hash length. 32 bytes
 	}
 
diff --git a/contracts/ens/cid_test.go b/contracts/ens/cid_test.go
index f2f188084..7d0e67851 100644
--- a/contracts/ens/cid_test.go
+++ b/contracts/ens/cid_test.go
@@ -76,17 +76,17 @@ func TestManualCidDecode(t *testing.T) {
 	}{
 		{
 			name:        "values correct, should not fail",
-			headerBytes: []byte{0xe4, 0x01, 0xfa, 0xd6, 0x20},
+			headerBytes: []byte{0xe4, 0x01, 0xfa, 0x1b, 0x20},
 			wantErr:     false,
 		},
 		{
 			name:        "cid version wrong, should fail",
-			headerBytes: []byte{0xe4, 0x00, 0xfa, 0xd6, 0x20},
+			headerBytes: []byte{0xe4, 0x00, 0xfa, 0x1b, 0x20},
 			wantErr:     true,
 		},
 		{
 			name:        "hash length wrong, should fail",
-			headerBytes: []byte{0xe4, 0x01, 0xfa, 0xd6, 0x1f},
+			headerBytes: []byte{0xe4, 0x01, 0xfa, 0x1b, 0x1f},
 			wantErr:     true,
 		},
 		{