1 files changed, 44 insertions, 22 deletions
diff --git a/packages/contracts/src/utils/order_utils.ts b/packages/contracts/src/utils/order_utils.ts
index 9542a3858..78ac934a1 100644
--- a/packages/contracts/src/utils/order_utils.ts
+++ b/packages/contracts/src/utils/order_utils.ts
@@ -1,11 +1,9 @@
 import { Order, SignedOrder, UnsignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import ethUtil = require('ethereumjs-util');
-import * as _ from 'lodash';
 
 import { crypto } from './crypto';
-import { CancelOrder, MatchOrder, SignatureType } from './types';
+import { CancelOrder, MatchOrder, OrderStruct, SignedOrder, UnsignedOrder } from './types';
 
 export const orderUtils = {
     createFill: (signedOrder: SignedOrder, takerAssetFillAmount?: BigNumber) => {
@@ -40,24 +38,41 @@ export const orderUtils = {
         };
         return orderStruct;
     },
-    getOrderHashBuff(order: SignedOrder | UnsignedOrder): Buffer {
+    getDomainSeparatorSchemaHex(): string {
+        const domainSeparatorSchemaHashBuff = crypto.solSHA3(['DomainSeparator(address contract)']);
+        const schemaHashHex = `0x${domainSeparatorSchemaHashBuff.toString('hex')}`;
+        return schemaHashHex;
+    },
+    getDomainSeparatorHashHex(exchangeAddress: string): string {
+        const domainSeparatorHashBuff = crypto.solSHA3([exchangeAddress]);
+        const domainSeparatorHashHex = `0x${domainSeparatorHashBuff.toString('hex')}`;
+        return domainSeparatorHashHex;
+    },
+    getOrderSchemaHex(): string {
         const orderSchemaHashBuff = crypto.solSHA3([
-            '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',
+            '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,',
+            ')',
         ]);
+        const schemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
+        return schemaHashHex;
+    },
+    getOrderHashBuff(order: SignedOrder | UnsignedOrder): Buffer {
+        const makerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.makerAssetData)]);
+        const takerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.takerAssetData)]);
+
         const orderParamsHashBuff = crypto.solSHA3([
-            order.exchangeAddress,
             order.makerAddress,
             order.takerAddress,
             order.feeRecipientAddress,
@@ -68,12 +83,19 @@ export const orderUtils = {
             order.takerFee,
             order.expirationTimeSeconds,
             order.salt,
-            ethUtil.toBuffer(order.makerAssetData),
-            ethUtil.toBuffer(order.takerAssetData),
+            makerAssetDataHash,
+            takerAssetDataHash,
         ]);
-        const orderSchemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
         const orderParamsHashHex = `0x${orderParamsHashBuff.toString('hex')}`;
-        const orderHashBuff = crypto.solSHA3([new BigNumber(orderSchemaHashHex), new BigNumber(orderParamsHashHex)]);
+        const orderSchemaHashHex = orderUtils.getOrderSchemaHex();
+        const domainSeparatorHashHex = this.getDomainSeparatorHashHex(order.exchangeAddress);
+        const domainSeparatorSchemaHex = this.getDomainSeparatorSchemaHex();
+        const orderHashBuff = crypto.solSHA3([
+            new BigNumber(domainSeparatorSchemaHex),
+            new BigNumber(domainSeparatorHashHex),
+            new BigNumber(orderSchemaHashHex),
+            new BigNumber(orderParamsHashHex),
+        ]);
         return orderHashBuff;
     },
     getOrderHashHex(order: SignedOrder | UnsignedOrder): string {