From ddbe2acbf52a75d24f9ae9ff7d1da072fbf58d46 Mon Sep 17 00:00:00 2001
From: Lawrence Forman <lawrence@0xproject.com>
Date: Tue, 25 Jun 2019 12:07:51 -0400
Subject: [PATCH] `@0x/contracts-utils`: Add LibEIP1271.sol

---
 contracts/utils/CHANGELOG.json               |  4 +++
 contracts/utils/compiler.json                |  1 +
 contracts/utils/contracts/src/LibEIP1271.sol | 26 ++++++++++++++++++++
 3 files changed, 31 insertions(+)
 create mode 100644 contracts/utils/contracts/src/LibEIP1271.sol

diff --git a/contracts/utils/CHANGELOG.json b/contracts/utils/CHANGELOG.json
index e6291f1b9f..ba3ac8e2b8 100644
--- a/contracts/utils/CHANGELOG.json
+++ b/contracts/utils/CHANGELOG.json
@@ -17,6 +17,10 @@
             {
                 "note": "Break out types/interaces from `MRichErrors` into `MRichErrorTypes`.",
                 "pr": 1790
+            },
+            {
+                "note": "Add LibEIP1271.sol",
+                "pr": 1885
             }
         ]
     },
diff --git a/contracts/utils/compiler.json b/contracts/utils/compiler.json
index 942d46253d..600011d083 100644
--- a/contracts/utils/compiler.json
+++ b/contracts/utils/compiler.json
@@ -26,6 +26,7 @@
     "contracts": [
         "src/LibAddress.sol",
         "src/LibBytes.sol",
+        "src/LibEIP1271.sol",
         "src/LibEIP712.sol",
         "src/Ownable.sol",
         "src/ReentrancyGuard.sol",
diff --git a/contracts/utils/contracts/src/LibEIP1271.sol b/contracts/utils/contracts/src/LibEIP1271.sol
new file mode 100644
index 0000000000..0b8cbd2af8
--- /dev/null
+++ b/contracts/utils/contracts/src/LibEIP1271.sol
@@ -0,0 +1,26 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+
+
+contract LibEIP1271 {
+
+    // Magic bytes returned by EIP1271 wallets on success.
+    bytes4 constant public EIP1271_MAGIC_VALUE = 0x20c13b0b;
+}