1 files changed, 84 insertions, 0 deletions
diff --git a/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibOrder.sol b/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibOrder.sol
new file mode 100644
index 000000000..0fe8c8c96
--- /dev/null
+++ b/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibOrder.sol
@@ -0,0 +1,84 @@
+/*
+
+  Copyright 2018 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 ^0.4.23;
+
+contract LibOrder {
+
+    bytes32 constant ORDER_SCHEMA_HASH = keccak256(
+        "address exchangeAddress",
+        "address makerAddress",
+        "address takerAddress",
+        "address feeRecipientAddress",
+        "address senderAddress",
+        "uint256 makerAssetAmount",
+        "uint256 takerAssetAmount",
+        "uint256 makerFee",
+        "uint256 takerFee",
+        "uint256 expirationTimeSeconds",
+        "uint256 salt",
+        "bytes makerAssetData",
+        "bytes takerAssetData"
+    );
+
+    struct Order {
+        address makerAddress;
+        address takerAddress;
+        address feeRecipientAddress;
+        address senderAddress;
+        uint256 makerAssetAmount;
+        uint256 takerAssetAmount;
+        uint256 makerFee;
+        uint256 takerFee;
+        uint256 expirationTimeSeconds;
+        uint256 salt;
+        bytes makerAssetData;
+        bytes takerAssetData;
+    }
+
+    /// @dev Calculates Keccak-256 hash of the order.
+    /// @param order The order structure.
+    /// @return Keccak-256 EIP712 hash of the order.
+    function getOrderHash(Order memory order)
+        internal
+        view
+        returns (bytes32 orderHash)
+    {
+        // TODO: EIP712 is not finalized yet
+        // Source: https://github.com/ethereum/EIPs/pull/712
+        orderHash = keccak256(
+            ORDER_SCHEMA_HASH,
+            keccak256(
+                address(this),
+                order.makerAddress,
+                order.takerAddress,
+                order.feeRecipientAddress,
+                order.senderAddress,
+                order.makerAssetAmount,
+                order.takerAssetAmount,
+                order.makerFee,
+                order.takerFee,
+                order.expirationTimeSeconds,
+                order.salt,
+                order.makerAssetData,
+                order.takerAssetData
+            )
+        );
+        return orderHash;
+    }
+}