Move order utils to @0xproject/order-utils

52 files changed, 920 insertions, 395 deletions

diff --git a/packages/0x.js/CHANGELOG.json b/packages/0x.js/CHANGELOG.json
index b2aebf803..c2545b7da 100644
--- a/packages/0x.js/CHANGELOG.json
+++ b/packages/0x.js/CHANGELOG.json
@@ -1,5 +1,18 @@
 [
     {
+        "version": "0.38.0",
+        "changes": [
+            {
+                "note": "Add `zeroEx.getProvider()`",
+                "pr": 559
+            },
+            {
+                "note": "Move `ZeroExError.InvalidSignature` to `@0xproject/order-utils` `OrderError.InvalidSignature`",
+                "pr": 559
+            }
+        ]
+    },
+    {
         "version": "0.37.0",
         "changes": [
             {
diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index 24fd44413..33c29a788 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -103,6 +103,7 @@
         "@0xproject/types": "^0.6.1",
         "@0xproject/typescript-typings": "^0.2.0",
         "@0xproject/utils": "^0.5.2",
+        "@0xproject/order-utils": "^0.0.1",
         "@0xproject/web3-wrapper": "^0.6.1",
         "bintrees": "^1.0.2",
         "bn.js": "^4.11.8",
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index 94d97c23e..780d1b52a 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -1,4 +1,12 @@
 import { schemas, SchemaValidator } from '@0xproject/json-schemas';
+import {
+    assert,
+    generatePseudoRandomSalt,
+    getOrderHashHex,
+    isValidOrderHash,
+    isValidSignature,
+    signOrderHashAsync,
+} from '@0xproject/order-utils';
 import { ECSignature, Order, Provider, SignedOrder, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
 import { AbiDecoder, BigNumber, intervalUtils } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -16,10 +24,8 @@ import { zeroExConfigSchema } from './schemas/zero_ex_config_schema';
 import { zeroExPrivateNetworkConfigSchema } from './schemas/zero_ex_private_network_config_schema';
 import { zeroExPublicNetworkConfigSchema } from './schemas/zero_ex_public_network_config_schema';
 import { OrderStateWatcherConfig, ZeroExConfig, ZeroExError } from './types';
-import { assert } from './utils/assert';
 import { constants } from './utils/constants';
 import { decorators } from './utils/decorators';
-import { signatureUtils } from './utils/signature_utils';
 import { utils } from './utils/utils';
 
 /**
@@ -33,6 +39,36 @@ export class ZeroEx {
      * this constant for your convenience.
      */
     public static NULL_ADDRESS = constants.NULL_ADDRESS;
+    /**
+     * Generates a pseudo-random 256-bit salt.
+     * The salt can be included in a 0x order, ensuring that the order generates a unique orderHash
+     * and will not collide with other outstanding orders that are identical in all other parameters.
+     * @return  A pseudo-random 256-bit number that can be used as a salt.
+     */
+    public static generatePseudoRandomSalt = generatePseudoRandomSalt;
+    /**
+     * Verifies that the elliptic curve signature `signature` was generated
+     * by signing `data` with the private key corresponding to the `signerAddress` address.
+     * @param   data          The hex encoded data signed by the supplied signature.
+     * @param   signature     An object containing the elliptic curve signature parameters.
+     * @param   signerAddress The hex encoded address that signed the data, producing the supplied signature.
+     * @return  Whether the signature is valid for the supplied signerAddress and data.
+     */
+    public static isValidSignature = isValidSignature;
+    /**
+     * Computes the orderHash for a supplied order.
+     * @param   order   An object that conforms to the Order or SignedOrder interface definitions.
+     * @return  The resulting orderHash from hashing the supplied order.
+     */
+    public static getOrderHashHex = getOrderHashHex;
+    /**
+     * Checks if the supplied hex encoded order hash is valid.
+     * Note: Valid means it has the expected format, not that an order with the orderHash exists.
+     * Use this method when processing orderHashes submitted as user input.
+     * @param   orderHash    Hex encoded orderHash.
+     * @return  Whether the supplied orderHash has the expected format.
+     */
+    public static isValidOrderHash = isValidOrderHash;
 
     /**
      * An instance of the ExchangeWrapper class containing methods for interacting with the 0x Exchange smart contract.
@@ -59,52 +95,6 @@ export class ZeroEx {
     public proxy: TokenTransferProxyWrapper;
     private _web3Wrapper: Web3Wrapper;
     /**
-     * Verifies that the elliptic curve signature `signature` was generated
-     * by signing `data` with the private key corresponding to the `signerAddress` address.
-     * @param   data          The hex encoded data signed by the supplied signature.
-     * @param   signature     An object containing the elliptic curve signature parameters.
-     * @param   signerAddress The hex encoded address that signed the data, producing the supplied signature.
-     * @return  Whether the signature is valid for the supplied signerAddress and data.
-     */
-    public static isValidSignature(data: string, signature: ECSignature, signerAddress: string): boolean {
-        assert.isHexString('data', data);
-        assert.doesConformToSchema('signature', signature, schemas.ecSignatureSchema);
-        assert.isETHAddressHex('signerAddress', signerAddress);
-        const normalizedSignerAddress = signerAddress.toLowerCase();
-
-        const isValidSignature = signatureUtils.isValidSignature(data, signature, normalizedSignerAddress);
-        return isValidSignature;
-    }
-    /**
-     * Generates a pseudo-random 256-bit salt.
-     * The salt can be included in a 0x order, ensuring that the order generates a unique orderHash
-     * and will not collide with other outstanding orders that are identical in all other parameters.
-     * @return  A pseudo-random 256-bit number that can be used as a salt.
-     */
-    public static generatePseudoRandomSalt(): BigNumber {
-        // BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places.
-        // Source: https://mikemcl.github.io/bignumber.js/#random
-        const randomNumber = BigNumber.random(constants.MAX_DIGITS_IN_UNSIGNED_256_INT);
-        const factor = new BigNumber(10).pow(constants.MAX_DIGITS_IN_UNSIGNED_256_INT - 1);
-        const salt = randomNumber.times(factor).round();
-        return salt;
-    }
-    /**
-     * Checks if the supplied hex encoded order hash is valid.
-     * Note: Valid means it has the expected format, not that an order with the orderHash exists.
-     * Use this method when processing orderHashes submitted as user input.
-     * @param   orderHash    Hex encoded orderHash.
-     * @return  Whether the supplied orderHash has the expected format.
-     */
-    public static isValidOrderHash(orderHash: string): boolean {
-        // Since this method can be called to check if any arbitrary string conforms to an orderHash's
-        // format, we only assert that we were indeed passed a string.
-        assert.isString('orderHash', orderHash);
-        const schemaValidator = new SchemaValidator();
-        const isValidOrderHash = schemaValidator.validate(orderHash, schemas.orderHashSchema).valid;
-        return isValidOrderHash;
-    }
-    /**
      * A unit amount is defined as the amount of a token above the specified decimal places (integer part).
      * E.g: If a currency has 18 decimal places, 1e18 or one quintillion of the currency is equivalent
      * to 1 unit.
@@ -133,17 +123,6 @@ export class ZeroEx {
         return baseUnitAmount;
     }
     /**
-     * Computes the orderHash for a supplied order.
-     * @param   order   An object that conforms to the Order or SignedOrder interface definitions.
-     * @return  The resulting orderHash from hashing the supplied order.
-     */
-    @decorators.syncZeroExErrorHandler
-    public static getOrderHashHex(order: Order | SignedOrder): string {
-        assert.doesConformToSchema('order', order, schemas.orderSchema);
-        const orderHashHex = utils.getOrderHashHex(order);
-        return orderHashHex;
-    }
-    /**
      * Instantiates a new ZeroEx instance that provides the public interface to the 0x.js library.
      * @param   provider    The Provider instance you would like the 0x.js library to use for interacting with
      *                      the Ethereum network.
@@ -205,6 +184,12 @@ export class ZeroEx {
         (this.etherToken as any)._setNetworkId(networkId);
     }
     /**
+     * Get the provider instance currently used by 0x.js
+     */
+    public getProvider(): Provider {
+        return this._web3Wrapper.getProvider();
+    }
+    /**
      * Get user Ethereum addresses available through the supplied web3 provider available for sending transactions.
      * @return  An array of available user Ethereum addresses.
      */
@@ -229,41 +214,12 @@ export class ZeroEx {
         signerAddress: string,
         shouldAddPersonalMessagePrefix: boolean,
     ): Promise<ECSignature> {
-        assert.isHexString('orderHash', orderHash);
-        await assert.isSenderAddressAsync('signerAddress', signerAddress, this._web3Wrapper);
-        const normalizedSignerAddress = signerAddress.toLowerCase();
-
-        let msgHashHex = orderHash;
-        if (shouldAddPersonalMessagePrefix) {
-            const orderHashBuff = ethUtil.toBuffer(orderHash);
-            const msgHashBuff = ethUtil.hashPersonalMessage(orderHashBuff);
-            msgHashHex = ethUtil.bufferToHex(msgHashBuff);
-        }
-
-        const signature = await this._web3Wrapper.signMessageAsync(normalizedSignerAddress, msgHashHex);
-
-        // HACK: There is no consensus on whether the signatureHex string should be formatted as
-        // v + r + s OR r + s + v, and different clients (even different versions of the same client)
-        // return the signature params in different orders. In order to support all client implementations,
-        // we parse the signature in both ways, and evaluate if either one is a valid signature.
-        const validVParamValues = [27, 28];
-        const ecSignatureVRS = signatureUtils.parseSignatureHexAsVRS(signature);
-        if (_.includes(validVParamValues, ecSignatureVRS.v)) {
-            const isValidVRSSignature = ZeroEx.isValidSignature(orderHash, ecSignatureVRS, normalizedSignerAddress);
-            if (isValidVRSSignature) {
-                return ecSignatureVRS;
-            }
-        }
-
-        const ecSignatureRSV = signatureUtils.parseSignatureHexAsRSV(signature);
-        if (_.includes(validVParamValues, ecSignatureRSV.v)) {
-            const isValidRSVSignature = ZeroEx.isValidSignature(orderHash, ecSignatureRSV, normalizedSignerAddress);
-            if (isValidRSVSignature) {
-                return ecSignatureRSV;
-            }
-        }
-
-        throw new Error(ZeroExError.InvalidSignature);
+        return signOrderHashAsync(
+            this._web3Wrapper.getProvider(),
+            orderHash,
+            signerAddress,
+            shouldAddPersonalMessagePrefix,
+        );
     }
     /**
      * Waits for a transaction to be mined and returns the transaction receipt.
diff --git a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
index fd39de34b..8a8caa4dc 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -1,4 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
+import { assert } from '@0xproject/order-utils';
 import { LogWithDecodedArgs } from '@0xproject/types';
 import { AbiDecoder, BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -6,7 +7,6 @@ import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
 import { BlockRange, EventCallback, IndexedFilterValues, TransactionOpts, ZeroExError } from '../types';
-import { assert } from '../utils/assert';
 
 import { ContractWrapper } from './contract_wrapper';
 import { EtherTokenContract, EtherTokenContractEventArgs, EtherTokenEvents } from './generated/ether_token';
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index 7cda70f16..5dca61ab3 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -1,4 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
+import { assert, getOrderHashHex } from '@0xproject/order-utils';
 import {
     BlockParamLiteral,
     DecodedLogArgs,
@@ -30,7 +31,6 @@ import {
     OrderValues,
     ValidateOrderFillableOpts,
 } from '../types';
-import { assert } from '../utils/assert';
 import { decorators } from '../utils/decorators';
 import { ExchangeTransferSimulator } from '../utils/exchange_transfer_simulator';
 import { OrderStateUtils } from '../utils/order_state_utils';
@@ -570,7 +570,7 @@ export class ExchangeWrapper extends ContractWrapper {
             ? SHOULD_VALIDATE_BY_DEFAULT
             : orderTransactionOpts.shouldValidate;
         if (shouldValidate) {
-            const orderHash = utils.getOrderHashHex(order);
+            const orderHash = getOrderHashHex(order);
             const unavailableTakerTokenAmount = await this.getUnavailableTakerAmountAsync(orderHash);
             OrderValidationUtils.validateCancelOrderThrowIfInvalid(
                 order,
@@ -629,7 +629,7 @@ export class ExchangeWrapper extends ContractWrapper {
             : orderTransactionOpts.shouldValidate;
         if (shouldValidate) {
             for (const orderCancellationRequest of orderCancellationRequests) {
-                const orderHash = utils.getOrderHashHex(orderCancellationRequest.order);
+                const orderHash = getOrderHashHex(orderCancellationRequest.order);
                 const unavailableTakerTokenAmount = await this.getUnavailableTakerAmountAsync(orderHash);
                 OrderValidationUtils.validateCancelOrderThrowIfInvalid(
                     orderCancellationRequest.order,
@@ -801,7 +801,7 @@ export class ExchangeWrapper extends ContractWrapper {
     ): Promise<void> {
         assert.doesConformToSchema('order', order, schemas.orderSchema);
         assert.isValidBaseUnitAmount('cancelTakerTokenAmount', cancelTakerTokenAmount);
-        const orderHash = utils.getOrderHashHex(order);
+        const orderHash = getOrderHashHex(order);
         const unavailableTakerTokenAmount = await this.getUnavailableTakerAmountAsync(orderHash);
         OrderValidationUtils.validateCancelOrderThrowIfInvalid(
             order,
diff --git a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
index c4a193264..a1ec91757 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -1,9 +1,9 @@
+import { assert } from '@0xproject/order-utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
 import { Token, TokenMetadata } from '../types';
-import { assert } from '../utils/assert';
 import { constants } from '../utils/constants';
 
 import { ContractWrapper } from './contract_wrapper';
diff --git a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
index be558b5be..495923ecc 100644
--- a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
@@ -1,8 +1,8 @@
+import { assert } from '@0xproject/order-utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
-import { assert } from '../utils/assert';
 
 import { ContractWrapper } from './contract_wrapper';
 import { TokenTransferProxyContract } from './generated/token_transfer_proxy';
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index 194cfb5aa..6751f46b3 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -1,4 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
+import { assert } from '@0xproject/order-utils';
 import { LogWithDecodedArgs } from '@0xproject/types';
 import { AbiDecoder, BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -6,7 +7,6 @@ import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
 import { BlockRange, EventCallback, IndexedFilterValues, MethodOpts, TransactionOpts, ZeroExError } from '../types';
-import { assert } from '../utils/assert';
 import { constants } from '../utils/constants';
 
 import { ContractWrapper } from './contract_wrapper';
diff --git a/packages/0x.js/src/order_watcher/event_watcher.ts b/packages/0x.js/src/order_watcher/event_watcher.ts
index de5a99a46..545b352a4 100644
--- a/packages/0x.js/src/order_watcher/event_watcher.ts
+++ b/packages/0x.js/src/order_watcher/event_watcher.ts
@@ -1,10 +1,10 @@
+import { assert } from '@0xproject/order-utils';
 import { BlockParamLiteral, LogEntry } from '@0xproject/types';
 import { intervalUtils } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { EventWatcherCallback, ZeroExError } from '../types';
-import { assert } from '../utils/assert';
 
 const DEFAULT_EVENT_POLLING_INTERVAL_MS = 200;
 
diff --git a/packages/0x.js/src/order_watcher/order_state_watcher.ts b/packages/0x.js/src/order_watcher/order_state_watcher.ts
index a9df8ac9d..008db6bc4 100644
--- a/packages/0x.js/src/order_watcher/order_state_watcher.ts
+++ b/packages/0x.js/src/order_watcher/order_state_watcher.ts
@@ -1,4 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
+import { assert } from '@0xproject/order-utils';
 import { BlockParamLiteral, LogWithDecodedArgs, SignedOrder } from '@0xproject/types';
 import { AbiDecoder, intervalUtils } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -33,7 +34,6 @@ import {
     OrderStateWatcherConfig,
     ZeroExError,
 } from '../types';
-import { assert } from '../utils/assert';
 import { OrderStateUtils } from '../utils/order_state_utils';
 import { utils } from '../utils/utils';
 
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index 151204928..ae9f98c5f 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -27,7 +27,6 @@ export enum ZeroExError {
     TokenContractDoesNotExist = 'TOKEN_CONTRACT_DOES_NOT_EXIST',
     UnhandledError = 'UNHANDLED_ERROR',
     UserHasNoAssociatedAddress = 'USER_HAS_NO_ASSOCIATED_ADDRESSES',
-    InvalidSignature = 'INVALID_SIGNATURE',
     ContractNotDeployedOnNetwork = 'CONTRACT_NOT_DEPLOYED_ON_NETWORK',
     InsufficientAllowanceForTransfer = 'INSUFFICIENT_ALLOWANCE_FOR_TRANSFER',
     InsufficientBalanceForTransfer = 'INSUFFICIENT_BALANCE_FOR_TRANSFER',
diff --git a/packages/0x.js/src/utils/constants.ts b/packages/0x.js/src/utils/constants.ts
index 06beec8e2..07da6745d 100644
--- a/packages/0x.js/src/utils/constants.ts
+++ b/packages/0x.js/src/utils/constants.ts
@@ -3,7 +3,6 @@ import { BigNumber } from '@0xproject/utils';
 export const constants = {
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
     TESTRPC_NETWORK_ID: 50,
-    MAX_DIGITS_IN_UNSIGNED_256_INT: 78,
     INVALID_JUMP_PATTERN: 'invalid JUMP at',
     OUT_OF_GAS_PATTERN: 'out of gas',
     INVALID_TAKER_FORMAT: 'instance.taker is not of a type(s) string',
diff --git a/packages/0x.js/src/utils/order_validation_utils.ts b/packages/0x.js/src/utils/order_validation_utils.ts
index b320a3e92..a13c3dc04 100644
--- a/packages/0x.js/src/utils/order_validation_utils.ts
+++ b/packages/0x.js/src/utils/order_validation_utils.ts
@@ -1,3 +1,4 @@
+import { getOrderHashHex, OrderError } from '@0xproject/order-utils';
 import { Order, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
@@ -113,7 +114,7 @@ export class OrderValidationUtils {
         zrxTokenAddress: string,
         expectedFillTakerTokenAmount?: BigNumber,
     ): Promise<void> {
-        const orderHash = utils.getOrderHashHex(signedOrder);
+        const orderHash = getOrderHashHex(signedOrder);
         const unavailableTakerTokenAmount = await this._exchangeWrapper.getUnavailableTakerAmountAsync(orderHash);
         OrderValidationUtils._validateRemainingFillAmountNotZeroOrThrow(
             signedOrder.takerTokenAmount,
@@ -142,9 +143,9 @@ export class OrderValidationUtils {
         if (fillTakerTokenAmount.eq(0)) {
             throw new Error(ExchangeContractErrs.OrderFillAmountZero);
         }
-        const orderHash = utils.getOrderHashHex(signedOrder);
+        const orderHash = getOrderHashHex(signedOrder);
         if (!ZeroEx.isValidSignature(orderHash, signedOrder.ecSignature, signedOrder.maker)) {
-            throw new Error(ZeroExError.InvalidSignature);
+            throw new Error(OrderError.InvalidSignature);
         }
         const unavailableTakerTokenAmount = await this._exchangeWrapper.getUnavailableTakerAmountAsync(orderHash);
         OrderValidationUtils._validateRemainingFillAmountNotZeroOrThrow(
diff --git a/packages/0x.js/src/utils/signature_utils.ts b/packages/0x.js/src/utils/signature_utils.ts
deleted file mode 100644
index 46f167339..000000000
--- a/packages/0x.js/src/utils/signature_utils.ts
+++ /dev/null
@@ -1,45 +0,0 @@
-import { ECSignature } from '@0xproject/types';
-import * as ethUtil from 'ethereumjs-util';
-
-export const signatureUtils = {
-    isValidSignature(data: string, signature: ECSignature, signerAddress: string): boolean {
-        const dataBuff = ethUtil.toBuffer(data);
-        const msgHashBuff = ethUtil.hashPersonalMessage(dataBuff);
-        try {
-            const pubKey = ethUtil.ecrecover(
-                msgHashBuff,
-                signature.v,
-                ethUtil.toBuffer(signature.r),
-                ethUtil.toBuffer(signature.s),
-            );
-            const retrievedAddress = ethUtil.bufferToHex(ethUtil.pubToAddress(pubKey));
-            return retrievedAddress === signerAddress;
-        } catch (err) {
-            return false;
-        }
-    },
-    parseSignatureHexAsVRS(signatureHex: string): ECSignature {
-        const signatureBuffer = ethUtil.toBuffer(signatureHex);
-        let v = signatureBuffer[0];
-        if (v < 27) {
-            v += 27;
-        }
-        const r = signatureBuffer.slice(1, 33);
-        const s = signatureBuffer.slice(33, 65);
-        const ecSignature: ECSignature = {
-            v,
-            r: ethUtil.bufferToHex(r),
-            s: ethUtil.bufferToHex(s),
-        };
-        return ecSignature;
-    },
-    parseSignatureHexAsRSV(signatureHex: string): ECSignature {
-        const { v, r, s } = ethUtil.fromRpcSig(signatureHex);
-        const ecSignature: ECSignature = {
-            v,
-            r: ethUtil.bufferToHex(r),
-            s: ethUtil.bufferToHex(s),
-        };
-        return ecSignature;
-    },
-};
diff --git a/packages/0x.js/src/utils/utils.ts b/packages/0x.js/src/utils/utils.ts
index c8bcd907e..af1125632 100644
--- a/packages/0x.js/src/utils/utils.ts
+++ b/packages/0x.js/src/utils/utils.ts
@@ -1,59 +1,9 @@
-import { Order, SignedOrder, SolidityTypes } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
-import BN = require('bn.js');
-import * as ethABI from 'ethereumjs-abi';
-import * as ethUtil from 'ethereumjs-util';
-import * as _ from 'lodash';
 
 export const utils = {
-    /**
-     * Converts BigNumber instance to BN
-     * The only reason we convert to BN is to remain compatible with `ethABI. soliditySHA3` that
-     * expects values of Solidity type `uint` to be passed as type `BN`.
-     * We do not use BN anywhere else in the codebase.
-     */
-    bigNumberToBN(value: BigNumber) {
-        return new BN(value.toString(), 10);
-    },
     spawnSwitchErr(name: string, value: any): Error {
         return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
     },
-    getOrderHashHex(order: Order | SignedOrder): string {
-        const orderParts = [
-            { value: order.exchangeContractAddress, type: SolidityTypes.Address },
-            { value: order.maker, type: SolidityTypes.Address },
-            { value: order.taker, type: SolidityTypes.Address },
-            { value: order.makerTokenAddress, type: SolidityTypes.Address },
-            { value: order.takerTokenAddress, type: SolidityTypes.Address },
-            { value: order.feeRecipient, type: SolidityTypes.Address },
-            {
-                value: utils.bigNumberToBN(order.makerTokenAmount),
-                type: SolidityTypes.Uint256,
-            },
-            {
-                value: utils.bigNumberToBN(order.takerTokenAmount),
-                type: SolidityTypes.Uint256,
-            },
-            {
-                value: utils.bigNumberToBN(order.makerFee),
-                type: SolidityTypes.Uint256,
-            },
-            {
-                value: utils.bigNumberToBN(order.takerFee),
-                type: SolidityTypes.Uint256,
-            },
-            {
-                value: utils.bigNumberToBN(order.expirationUnixTimestampSec),
-                type: SolidityTypes.Uint256,
-            },
-            { value: utils.bigNumberToBN(order.salt), type: SolidityTypes.Uint256 },
-        ];
-        const types = _.map(orderParts, o => o.type);
-        const values = _.map(orderParts, o => o.value);
-        const hashBuff = ethABI.soliditySHA3(types, values);
-        const hashHex = ethUtil.bufferToHex(hashBuff);
-        return hashHex;
-    },
     getCurrentUnixTimestampSec(): BigNumber {
         return new BigNumber(Date.now() / 1000).round();
     },
diff --git a/packages/0x.js/test/0x.js_test.ts b/packages/0x.js/test/0x.js_test.ts
index 838ee7080..6dccdaea7 100644
--- a/packages/0x.js/test/0x.js_test.ts
+++ b/packages/0x.js/test/0x.js_test.ts
@@ -17,8 +17,6 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 chaiSetup.configure();
 const expect = chai.expect;
 
-const SHOULD_ADD_PERSONAL_MESSAGE_PREFIX = false;
-
 describe('ZeroEx library', () => {
     let zeroEx: ZeroEx;
     before(async () => {
@@ -63,14 +61,12 @@ describe('ZeroEx library', () => {
         };
         const address = '0x5409ed021d9299bf6814279a6a1411a7e866a631';
         it("should return false if the data doesn't pertain to the signature & address", async () => {
-            expect(ZeroEx.isValidSignature('0x0', signature, address)).to.be.false();
             return expect(
                 (zeroEx.exchange as any)._isValidSignatureUsingContractCallAsync('0x0', signature, address),
             ).to.become(false);
         });
         it("should return false if the address doesn't pertain to the signature & data", async () => {
             const validUnrelatedAddress = '0x8b0292b11a196601ed2ce54b665cafeca0347d42';
-            expect(ZeroEx.isValidSignature(dataHex, signature, validUnrelatedAddress)).to.be.false();
             return expect(
                 (zeroEx.exchange as any)._isValidSignatureUsingContractCallAsync(
                     dataHex,
@@ -81,45 +77,16 @@ describe('ZeroEx library', () => {
         });
         it("should return false if the signature doesn't pertain to the dataHex & address", async () => {
             const wrongSignature = _.assign({}, signature, { v: 28 });
-            expect(ZeroEx.isValidSignature(dataHex, wrongSignature, address)).to.be.false();
             return expect(
                 (zeroEx.exchange as any)._isValidSignatureUsingContractCallAsync(dataHex, wrongSignature, address),
             ).to.become(false);
         });
         it('should return true if the signature does pertain to the dataHex & address', async () => {
-            const isValidSignatureLocal = ZeroEx.isValidSignature(dataHex, signature, address);
-            expect(isValidSignatureLocal).to.be.true();
             return expect(
                 (zeroEx.exchange as any)._isValidSignatureUsingContractCallAsync(dataHex, signature, address),
             ).to.become(true);
         });
     });
-    describe('#generateSalt', () => {
-        it('generates different salts', () => {
-            const equal = ZeroEx.generatePseudoRandomSalt().eq(ZeroEx.generatePseudoRandomSalt());
-            expect(equal).to.be.false();
-        });
-        it('generates salt in range [0..2^256)', () => {
-            const salt = ZeroEx.generatePseudoRandomSalt();
-            expect(salt.greaterThanOrEqualTo(0)).to.be.true();
-            const twoPow256 = new BigNumber(2).pow(256);
-            expect(salt.lessThan(twoPow256)).to.be.true();
-        });
-    });
-    describe('#isValidOrderHash', () => {
-        it('returns false if the value is not a hex string', () => {
-            const isValid = ZeroEx.isValidOrderHash('not a hex');
-            expect(isValid).to.be.false();
-        });
-        it('returns false if the length is wrong', () => {
-            const isValid = ZeroEx.isValidOrderHash('0xdeadbeef');
-            expect(isValid).to.be.false();
-        });
-        it('returns true if order hash is correct', () => {
-            const isValid = ZeroEx.isValidOrderHash('0x' + Array(65).join('0'));
-            expect(isValid).to.be.true();
-        });
-    });
     describe('#toUnitAmount', () => {
         it('should throw if invalid baseUnit amount supplied as argument', () => {
             const invalidBaseUnitAmount = new BigNumber(1000000000.4);
@@ -152,106 +119,6 @@ describe('ZeroEx library', () => {
             );
         });
     });
-    describe('#getOrderHashHex', () => {
-        const expectedOrderHash = '0x39da987067a3c9e5f1617694f1301326ba8c8b0498ebef5df4863bed394e3c83';
-        const fakeExchangeContractAddress = '0xb69e673309512a9d726f87304c6984054f87a93b';
-        const order: Order = {
-            maker: constants.NULL_ADDRESS,
-            taker: constants.NULL_ADDRESS,
-            feeRecipient: constants.NULL_ADDRESS,
-            makerTokenAddress: constants.NULL_ADDRESS,
-            takerTokenAddress: constants.NULL_ADDRESS,
-            exchangeContractAddress: fakeExchangeContractAddress,
-            salt: new BigNumber(0),
-            makerFee: new BigNumber(0),
-            takerFee: new BigNumber(0),
-            makerTokenAmount: new BigNumber(0),
-            takerTokenAmount: new BigNumber(0),
-            expirationUnixTimestampSec: new BigNumber(0),
-        };
-        it('calculates the order hash', async () => {
-            const orderHash = ZeroEx.getOrderHashHex(order);
-            expect(orderHash).to.be.equal(expectedOrderHash);
-        });
-        it('throws a readable error message if taker format is invalid', async () => {
-            const orderWithInvalidtakerFormat = {
-                ...order,
-                taker: (null as any) as string,
-            };
-            const expectedErrorMessage =
-                'Order taker must be of type string. If you want anyone to be able to fill an order - pass ZeroEx.NULL_ADDRESS';
-            expect(() => ZeroEx.getOrderHashHex(orderWithInvalidtakerFormat)).to.throw(expectedErrorMessage);
-        });
-    });
-    describe('#signOrderHashAsync', () => {
-        let stubs: Sinon.SinonStub[] = [];
-        let makerAddress: string;
-        before(async () => {
-            const availableAddreses = await zeroEx.getAvailableAddressesAsync();
-            makerAddress = availableAddreses[0];
-        });
-        afterEach(() => {
-            // clean up any stubs after the test has completed
-            _.each(stubs, s => s.restore());
-            stubs = [];
-        });
-        it('Should return the correct ECSignature', async () => {
-            const orderHash = '0x6927e990021d23b1eb7b8789f6a6feaf98fe104bb0cf8259421b79f9a34222b0';
-            const expectedECSignature = {
-                v: 27,
-                r: '0x61a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
-                s: '0x40349190569279751135161d22529dc25add4f6069af05be04cacbda2ace2254',
-            };
-            const ecSignature = await zeroEx.signOrderHashAsync(
-                orderHash,
-                makerAddress,
-                SHOULD_ADD_PERSONAL_MESSAGE_PREFIX,
-            );
-            expect(ecSignature).to.deep.equal(expectedECSignature);
-        });
-        it('should return the correct ECSignature for signatureHex concatenated as R + S + V', async () => {
-            const orderHash = '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004';
-            const signature =
-                '0x22109d11d79cb8bf96ed88625e1cd9558800c4073332a9a02857499883ee5ce3050aa3cc1f2c435e67e114cdce54b9527b4f50548342401bc5d2b77adbdacb021b';
-            const expectedECSignature = {
-                v: 27,
-                r: '0x22109d11d79cb8bf96ed88625e1cd9558800c4073332a9a02857499883ee5ce3',
-                s: '0x050aa3cc1f2c435e67e114cdce54b9527b4f50548342401bc5d2b77adbdacb02',
-            };
-            stubs = [
-                Sinon.stub((zeroEx as any)._web3Wrapper, 'signMessageAsync').returns(Promise.resolve(signature)),
-                Sinon.stub(ZeroEx, 'isValidSignature').returns(true),
-            ];
-
-            const ecSignature = await zeroEx.signOrderHashAsync(
-                orderHash,
-                makerAddress,
-                SHOULD_ADD_PERSONAL_MESSAGE_PREFIX,
-            );
-            expect(ecSignature).to.deep.equal(expectedECSignature);
-        });
-        it('should return the correct ECSignature for signatureHex concatenated as V + R + S', async () => {
-            const orderHash = '0xc793e33ffded933b76f2f48d9aa3339fc090399d5e7f5dec8d3660f5480793f7';
-            const signature =
-                '0x1bc80bedc6756722672753413efdd749b5adbd4fd552595f59c13427407ee9aee02dea66f25a608bbae457e020fb6decb763deb8b7192abab624997242da248960';
-            const expectedECSignature = {
-                v: 27,
-                r: '0xc80bedc6756722672753413efdd749b5adbd4fd552595f59c13427407ee9aee0',
-                s: '0x2dea66f25a608bbae457e020fb6decb763deb8b7192abab624997242da248960',
-            };
-            stubs = [
-                Sinon.stub((zeroEx as any)._web3Wrapper, 'signMessageAsync').returns(Promise.resolve(signature)),
-                Sinon.stub(ZeroEx, 'isValidSignature').returns(true),
-            ];
-
-            const ecSignature = await zeroEx.signOrderHashAsync(
-                orderHash,
-                makerAddress,
-                SHOULD_ADD_PERSONAL_MESSAGE_PREFIX,
-            );
-            expect(ecSignature).to.deep.equal(expectedECSignature);
-        });
-    });
     describe('#awaitTransactionMinedAsync', () => {
         beforeEach(async () => {
             await blockchainLifecycle.startAsync();
diff --git a/packages/0x.js/test/assert_test.ts b/packages/0x.js/test/assert_test.ts
index b08f3e23b..e69de29bb 100644
--- a/packages/0x.js/test/assert_test.ts
+++ b/packages/0x.js/test/assert_test.ts
@@ -1,43 +0,0 @@
-import { web3Factory } from '@0xproject/dev-utils';
-import * as chai from 'chai';
-import 'mocha';
-
-import { ZeroEx } from '../src';
-import { assert } from '../src/utils/assert';
-
-import { constants } from './utils/constants';
-import { provider } from './utils/web3_wrapper';
-
-const expect = chai.expect;
-
-describe('Assertion library', () => {
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
-    const zeroEx = new ZeroEx(provider, config);
-    describe('#isSenderAddressHexAsync', () => {
-        it('throws when address is invalid', async () => {
-            const address = '0xdeadbeef';
-            const varName = 'address';
-            return expect(
-                assert.isSenderAddressAsync(varName, address, (zeroEx as any)._web3Wrapper),
-            ).to.be.rejectedWith(`Expected ${varName} to be of type ETHAddressHex, encountered: ${address}`);
-        });
-        it('throws when address is unavailable', async () => {
-            const validUnrelatedAddress = '0x8b0292b11a196601eddce54b665cafeca0347d42';
-            const varName = 'address';
-            return expect(
-                assert.isSenderAddressAsync(varName, validUnrelatedAddress, (zeroEx as any)._web3Wrapper),
-            ).to.be.rejectedWith(
-                `Specified ${varName} ${validUnrelatedAddress} isn't available through the supplied web3 provider`,
-            );
-        });
-        it("doesn't throw if address is available", async () => {
-            const availableAddress = (await zeroEx.getAvailableAddressesAsync())[0];
-            const varName = 'address';
-            return expect(
-                assert.isSenderAddressAsync(varName, availableAddress, (zeroEx as any)._web3Wrapper),
-            ).to.become(undefined);
-        });
-    });
-});
diff --git a/packages/0x.js/test/order_validation_test.ts b/packages/0x.js/test/order_validation_test.ts
index 9b843b930..0cb95c1b6 100644
--- a/packages/0x.js/test/order_validation_test.ts
+++ b/packages/0x.js/test/order_validation_test.ts
@@ -1,4 +1,5 @@
 import { BlockchainLifecycle, devConstants } from '@0xproject/dev-utils';
+import { OrderError } from '@0xproject/order-utils';
 import { BlockParamLiteral } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
@@ -169,7 +170,7 @@ describe('OrderValidation', () => {
             signedOrder.ecSignature.v = 28 - signedOrder.ecSignature.v + 27;
             return expect(
                 zeroEx.exchange.validateFillOrderThrowIfInvalidAsync(signedOrder, fillableAmount, takerAddress),
-            ).to.be.rejectedWith(ZeroExError.InvalidSignature);
+            ).to.be.rejectedWith(OrderError.InvalidSignature);
         });
         it('should throw when the order is fully filled or cancelled', async () => {
             const signedOrder = await fillScenarios.createFillableSignedOrderAsync(
diff --git a/packages/0x.js/test/utils/fill_scenarios.ts b/packages/0x.js/test/utils/fill_scenarios.ts
index 7d0e8c501..5a82a56d2 100644
--- a/packages/0x.js/test/utils/fill_scenarios.ts
+++ b/packages/0x.js/test/utils/fill_scenarios.ts
@@ -1,10 +1,10 @@
+import { orderFactory } from '@0xproject/order-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 
 import { SignedOrder, Token, ZeroEx } from '../../src';
 import { artifacts } from '../../src/artifacts';
 import { DummyTokenContract } from '../../src/contract_wrappers/generated/dummy_token';
-import { orderFactory } from '../utils/order_factory';
 
 import { constants } from './constants';
 
@@ -164,7 +164,7 @@ export class FillScenarios {
         ]);
 
         const signedOrder = await orderFactory.createSignedOrderAsync(
-            this._zeroEx,
+            this._zeroEx.getProvider(),
             makerAddress,
             takerAddress,
             makerFee,
diff --git a/packages/0x.js/test/utils/web3_wrapper.ts b/packages/0x.js/test/utils/web3_wrapper.ts
index b7b3f0b7f..b0ccfa546 100644
--- a/packages/0x.js/test/utils/web3_wrapper.ts
+++ b/packages/0x.js/test/utils/web3_wrapper.ts
@@ -1,9 +1,6 @@
 import { devConstants, web3Factory } from '@0xproject/dev-utils';
 import { Provider } from '@0xproject/types';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as Web3 from 'web3';
-
-import { constants } from './constants';
 
 const web3 = web3Factory.create({ shouldUseInProcessGanache: true });
 const provider: Provider = web3.currentProvider;
diff --git a/packages/order-utils/.npmignore b/packages/order-utils/.npmignore
new file mode 100644
index 000000000..24e65ad5b
--- /dev/null
+++ b/packages/order-utils/.npmignore
@@ -0,0 +1,6 @@
+.*
+yarn-error.log
+/scripts/
+/src/
+tsconfig.json
+/lib/monorepo_scripts/
diff --git a/packages/order-utils/CHANGELOG.json b/packages/order-utils/CHANGELOG.json
new file mode 100644
index 000000000..fe51488c7
--- /dev/null
+++ b/packages/order-utils/CHANGELOG.json
@@ -0,0 +1 @@
+[]
diff --git a/packages/order-utils/README.md b/packages/order-utils/README.md
new file mode 100644
index 000000000..4b571509a
--- /dev/null
+++ b/packages/order-utils/README.md
@@ -0,0 +1,77 @@
+## @0xproject/order-utils
+
+0x order-related utilities for those developing on top of 0x protocol.
+
+### Read the [Documentation](https://0xproject.com/docs/order-utils).
+
+## Installation
+
+```bash
+yarn add @0xproject/order-utils
+```
+
+If your project is in [TypeScript](https://www.typescriptlang.org/), add the following to your `tsconfig.json`:
+
+```json
+"compilerOptions": {
+    "typeRoots": ["node_modules/@0xproject/typescript-typings/types", "node_modules/@types"],
+}
+```
+
+## Contributing
+
+We welcome improvements and fixes from the wider community! To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+If this is your **first** time building this package, you must first build **all** packages within the monorepo. This is because packages that depend on other packages located inside this monorepo are symlinked when run from **within** the monorepo. This allows you to make changes across multiple packages without first publishing dependent packages to NPM. To build all packages, run the following from the monorepo root directory:
+
+```bash
+yarn lerna:rebuild
+```
+
+Or continuously rebuild on change:
+
+```bash
+yarn dev
+```
+
+You can also build this specific package by running the following from within its directory:
+
+```bash
+yarn build
+```
+
+or continuously rebuild on change:
+
+```bash
+yarn build:watch
+```
+
+### Clean
+
+```bash
+yarn clean
+```
+
+### Lint
+
+```bash
+yarn lint
+```
diff --git a/packages/order-utils/coverage/.gitkeep b/packages/order-utils/coverage/.gitkeep
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/packages/order-utils/coverage/.gitkeep
diff --git a/packages/order-utils/package.json b/packages/order-utils/package.json
new file mode 100644
index 000000000..cb21139a2
--- /dev/null
+++ b/packages/order-utils/package.json
@@ -0,0 +1,76 @@
+{
+    "name": "@0xproject/order-utils",
+    "version": "0.0.1",
+    "description": "0x order utils",
+    "main": "lib/src/index.js",
+    "types": "lib/src/index.d.ts",
+    "scripts": {
+        "build:watch": "tsc -w",
+        "build": "tsc && copyfiles -u 3 './lib/src/monorepo_scripts/**/*' ./scripts",
+        "test": "run-s clean build run_mocha",
+        "test:circleci": "yarn test:coverage",
+        "run_mocha": "mocha lib/test/**/*_test.js --bail --exit",
+        "test:coverage": "nyc npm run test --all && yarn coverage:report:lcov",
+        "coverage:report:lcov": "nyc report --reporter=text-lcov > coverage/lcov.info",
+        "clean": "shx rm -rf lib scripts",
+        "lint": "tslint --project .",
+        "manual:postpublish": "yarn build; node ./scripts/postpublish.js",
+        "docs:stage": "yarn build && node ./scripts/stage_docs.js",
+        "docs:json": "typedoc --excludePrivate --excludeExternals --target ES5 --json $JSON_FILE_PATH $PROJECT_FILES",
+        "upload_docs_json": "aws s3 cp generated_docs/index.json $S3_URL --profile 0xproject --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers --content-type application/json"
+    },
+    "config": {
+        "postpublish": {
+            "docPublishConfigs": {
+                "extraFileIncludes": [
+                    "../types/src/index.ts"
+                ],
+                "s3BucketPath": "s3://doc-jsons/order-utils/",
+                "s3StagingBucketPath": "s3://staging-doc-jsons/order-utils/"
+            }
+        }
+    },
+    "license": "Apache-2.0",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/0xProject/0x-monorepo.git"
+    },
+    "bugs": {
+        "url": "https://github.com/0xProject/0x-monorepo/issues"
+    },
+    "homepage": "https://github.com/0xProject/0x-monorepo/packages/order-utils/README.md",
+    "devDependencies": {
+        "@0xproject/monorepo-scripts": "^0.1.18",
+        "@0xproject/dev-utils": "^0.3.6",
+        "@0xproject/tslint-config": "^0.4.16",
+        "@types/lodash": "4.14.104",
+        "chai": "^4.0.1",
+        "chai-as-promised": "^7.1.0",
+        "chai-bignumber": "^2.0.1",
+        "dirty-chai": "^2.0.1",
+        "sinon": "^4.0.0",
+        "mocha": "^4.0.1",
+        "copyfiles": "^1.2.0",
+        "npm-run-all": "^4.1.2",
+        "typedoc": "0xProject/typedoc",
+        "shx": "^0.2.2",
+        "tslint": "5.8.0",
+        "typescript": "2.7.1"
+    },
+    "dependencies": {
+        "@0xproject/assert": "^0.2.7",
+        "@0xproject/types": "^0.6.1",
+        "@0xproject/json-schemas": "^0.7.21",
+        "@0xproject/typescript-typings": "^0.2.0",
+        "@0xproject/web3-wrapper": "^0.6.1",
+        "@0xproject/utils": "^0.5.2",
+        "@types/node": "^8.0.53",
+        "bn.js": "^4.11.8",
+        "lodash": "^4.17.4",
+        "ethereumjs-abi": "^0.6.4",
+        "ethereumjs-util": "^5.1.1"
+    },
+    "publishConfig": {
+        "access": "public"
+    }
+}
diff --git a/packages/0x.js/src/utils/assert.ts b/packages/order-utils/src/assert.ts
index 5e8004cd0..92641b845 100644
--- a/packages/0x.js/src/utils/assert.ts
+++ b/packages/order-utils/src/assert.ts
@@ -8,13 +8,13 @@ import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
-import { signatureUtils } from '../utils/signature_utils';
+import { isValidSignature } from './signature_utils';
 
 export const assert = {
     ...sharedAssert,
     isValidSignature(orderHash: string, ecSignature: ECSignature, signerAddress: string) {
-        const isValidSignature = signatureUtils.isValidSignature(orderHash, ecSignature, signerAddress);
-        this.assert(isValidSignature, `Expected order with hash '${orderHash}' to have a valid signature`);
+        const isValid = isValidSignature(orderHash, ecSignature, signerAddress);
+        this.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
     },
     async isSenderAddressAsync(
         variableName: string,
diff --git a/packages/order-utils/src/constants.ts b/packages/order-utils/src/constants.ts
new file mode 100644
index 000000000..ec2fe744a
--- /dev/null
+++ b/packages/order-utils/src/constants.ts
@@ -0,0 +1,3 @@
+export const constants = {
+    NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
+};
diff --git a/packages/order-utils/src/globals.d.ts b/packages/order-utils/src/globals.d.ts
new file mode 100644
index 000000000..94e63a32d
--- /dev/null
+++ b/packages/order-utils/src/globals.d.ts
@@ -0,0 +1,6 @@
+declare module '*.json' {
+    const json: any;
+    /* tslint:disable */
+    export default json;
+    /* tslint:enable */
+}
diff --git a/packages/order-utils/src/index.ts b/packages/order-utils/src/index.ts
new file mode 100644
index 000000000..4addd60d6
--- /dev/null
+++ b/packages/order-utils/src/index.ts
@@ -0,0 +1,7 @@
+export { getOrderHashHex, isValidOrderHash } from './order_hash';
+export { isValidSignature, signOrderHashAsync } from './signature_utils';
+export { orderFactory } from './order_factory';
+export { generatePseudoRandomSalt } from './salt';
+export { assert } from './assert';
+export { constants } from './constants';
+export { OrderError } from './types';
diff --git a/packages/order-utils/src/monorepo_scripts/postpublish.ts b/packages/order-utils/src/monorepo_scripts/postpublish.ts
new file mode 100644
index 000000000..dcb99d0f7
--- /dev/null
+++ b/packages/order-utils/src/monorepo_scripts/postpublish.ts
@@ -0,0 +1,8 @@
+import { postpublishUtils } from '@0xproject/monorepo-scripts';
+
+import * as packageJSON from '../package.json';
+import * as tsConfigJSON from '../tsconfig.json';
+
+const cwd = `${__dirname}/..`;
+// tslint:disable-next-line:no-floating-promises
+postpublishUtils.runAsync(packageJSON, tsConfigJSON, cwd);
diff --git a/packages/order-utils/src/monorepo_scripts/stage_docs.ts b/packages/order-utils/src/monorepo_scripts/stage_docs.ts
new file mode 100644
index 000000000..e732ac8eb
--- /dev/null
+++ b/packages/order-utils/src/monorepo_scripts/stage_docs.ts
@@ -0,0 +1,8 @@
+import { postpublishUtils } from '@0xproject/monorepo-scripts';
+
+import * as packageJSON from '../package.json';
+import * as tsConfigJSON from '../tsconfig.json';
+
+const cwd = `${__dirname}/..`;
+// tslint:disable-next-line:no-floating-promises
+postpublishUtils.publishDocsToStagingAsync(packageJSON, tsConfigJSON, cwd);
diff --git a/packages/0x.js/test/utils/order_factory.ts b/packages/order-utils/src/order_factory.ts
index 08f2081a4..2759aac81 100644
--- a/packages/0x.js/test/utils/order_factory.ts
+++ b/packages/order-utils/src/order_factory.ts
@@ -1,13 +1,16 @@
+import { Provider, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 
-import { SignedOrder, ZeroEx } from '../../src';
+import { getOrderHashHex } from './order_hash';
+import { generatePseudoRandomSalt } from './salt';
+import { signOrderHashAsync } from './signature_utils';
 
 const SHOULD_ADD_PERSONAL_MESSAGE_PREFIX = false;
 
 export const orderFactory = {
     async createSignedOrderAsync(
-        zeroEx: ZeroEx,
+        provider: Provider,
         maker: string,
         taker: string,
         makerFee: BigNumber,
@@ -33,13 +36,13 @@ export const orderFactory = {
             takerTokenAmount,
             makerTokenAddress,
             takerTokenAddress,
-            salt: ZeroEx.generatePseudoRandomSalt(),
+            salt: generatePseudoRandomSalt(),
             exchangeContractAddress,
             feeRecipient,
             expirationUnixTimestampSec,
         };
-        const orderHash = ZeroEx.getOrderHashHex(order);
-        const ecSignature = await zeroEx.signOrderHashAsync(orderHash, maker, SHOULD_ADD_PERSONAL_MESSAGE_PREFIX);
+        const orderHash = getOrderHashHex(order);
+        const ecSignature = await signOrderHashAsync(provider, orderHash, maker, SHOULD_ADD_PERSONAL_MESSAGE_PREFIX);
         const signedOrder: SignedOrder = _.assign(order, { ecSignature });
         return signedOrder;
     },
diff --git a/packages/order-utils/src/order_hash.ts b/packages/order-utils/src/order_hash.ts
new file mode 100644
index 000000000..8da11c596
--- /dev/null
+++ b/packages/order-utils/src/order_hash.ts
@@ -0,0 +1,89 @@
+import { schemas, SchemaValidator } from '@0xproject/json-schemas';
+import { Order, SignedOrder, SolidityTypes } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+import BN = require('bn.js');
+import * as ethABI from 'ethereumjs-abi';
+import * as ethUtil from 'ethereumjs-util';
+import * as _ from 'lodash';
+
+import { assert } from './assert';
+
+const INVALID_TAKER_FORMAT = 'instance.taker is not of a type(s) string';
+
+/**
+ * Converts BigNumber instance to BN
+ * The only reason we convert to BN is to remain compatible with `ethABI.soliditySHA3` that
+ * expects values of Solidity type `uint` to be passed as type `BN`.
+ * We do not use BN anywhere else in the codebase.
+ */
+function bigNumberToBN(value: BigNumber) {
+    return new BN(value.toString(), 10);
+}
+
+/**
+ * Computes the orderHash for a supplied order.
+ * @param   order   An object that conforms to the Order or SignedOrder interface definitions.
+ * @return  The resulting orderHash from hashing the supplied order.
+ */
+export function getOrderHashHex(order: Order | SignedOrder): string {
+    try {
+        assert.doesConformToSchema('order', order, schemas.orderSchema);
+    } catch (error) {
+        if (_.includes(error.message, INVALID_TAKER_FORMAT)) {
+            const errMsg =
+                'Order taker must be of type string. If you want anyone to be able to fill an order - pass ZeroEx.NULL_ADDRESS';
+            throw new Error(errMsg);
+        }
+        throw error;
+    }
+    const orderParts = [
+        { value: order.exchangeContractAddress, type: SolidityTypes.Address },
+        { value: order.maker, type: SolidityTypes.Address },
+        { value: order.taker, type: SolidityTypes.Address },
+        { value: order.makerTokenAddress, type: SolidityTypes.Address },
+        { value: order.takerTokenAddress, type: SolidityTypes.Address },
+        { value: order.feeRecipient, type: SolidityTypes.Address },
+        {
+            value: bigNumberToBN(order.makerTokenAmount),
+            type: SolidityTypes.Uint256,
+        },
+        {
+            value: bigNumberToBN(order.takerTokenAmount),
+            type: SolidityTypes.Uint256,
+        },
+        {
+            value: bigNumberToBN(order.makerFee),
+            type: SolidityTypes.Uint256,
+        },
+        {
+            value: bigNumberToBN(order.takerFee),
+            type: SolidityTypes.Uint256,
+        },
+        {
+            value: bigNumberToBN(order.expirationUnixTimestampSec),
+            type: SolidityTypes.Uint256,
+        },
+        { value: bigNumberToBN(order.salt), type: SolidityTypes.Uint256 },
+    ];
+    const types = _.map(orderParts, o => o.type);
+    const values = _.map(orderParts, o => o.value);
+    const hashBuff = ethABI.soliditySHA3(types, values);
+    const hashHex = ethUtil.bufferToHex(hashBuff);
+    return hashHex;
+}
+
+/**
+ * Checks if the supplied hex encoded order hash is valid.
+ * Note: Valid means it has the expected format, not that an order with the orderHash exists.
+ * Use this method when processing orderHashes submitted as user input.
+ * @param   orderHash    Hex encoded orderHash.
+ * @return  Whether the supplied orderHash has the expected format.
+ */
+export function isValidOrderHash(orderHash: string): boolean {
+    // Since this method can be called to check if any arbitrary string conforms to an orderHash's
+    // format, we only assert that we were indeed passed a string.
+    assert.isString('orderHash', orderHash);
+    const schemaValidator = new SchemaValidator();
+    const isValid = schemaValidator.validate(orderHash, schemas.orderHashSchema).valid;
+    return isValid;
+}
diff --git a/packages/order-utils/src/salt.ts b/packages/order-utils/src/salt.ts
new file mode 100644
index 000000000..90a4197c0
--- /dev/null
+++ b/packages/order-utils/src/salt.ts
@@ -0,0 +1,18 @@
+import { BigNumber } from '@0xproject/utils';
+
+const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
+
+/**
+ * Generates a pseudo-random 256-bit salt.
+ * The salt can be included in a 0x order, ensuring that the order generates a unique orderHash
+ * and will not collide with other outstanding orders that are identical in all other parameters.
+ * @return  A pseudo-random 256-bit number that can be used as a salt.
+ */
+export function generatePseudoRandomSalt(): BigNumber {
+    // BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places.
+    // Source: https://mikemcl.github.io/bignumber.js/#random
+    const randomNumber = BigNumber.random(MAX_DIGITS_IN_UNSIGNED_256_INT);
+    const factor = new BigNumber(10).pow(MAX_DIGITS_IN_UNSIGNED_256_INT - 1);
+    const salt = randomNumber.times(factor).round();
+    return salt;
+}
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
new file mode 100644
index 000000000..b511573a8
--- /dev/null
+++ b/packages/order-utils/src/signature_utils.ts
@@ -0,0 +1,119 @@
+import { schemas } from '@0xproject/json-schemas';
+import { ECSignature, Provider } from '@0xproject/types';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as ethUtil from 'ethereumjs-util';
+import * as _ from 'lodash';
+
+import { assert } from './assert';
+import { OrderError } from './types';
+
+/**
+ * Verifies that the elliptic curve signature `signature` was generated
+ * by signing `data` with the private key corresponding to the `signerAddress` address.
+ * @param   data          The hex encoded data signed by the supplied signature.
+ * @param   signature     An object containing the elliptic curve signature parameters.
+ * @param   signerAddress The hex encoded address that signed the data, producing the supplied signature.
+ * @return  Whether the signature is valid for the supplied signerAddress and data.
+ */
+export function isValidSignature(data: string, signature: ECSignature, signerAddress: string): boolean {
+    assert.isHexString('data', data);
+    assert.doesConformToSchema('signature', signature, schemas.ecSignatureSchema);
+    assert.isETHAddressHex('signerAddress', signerAddress);
+    const normalizedSignerAddress = signerAddress.toLowerCase();
+
+    const dataBuff = ethUtil.toBuffer(data);
+    const msgHashBuff = ethUtil.hashPersonalMessage(dataBuff);
+    try {
+        const pubKey = ethUtil.ecrecover(
+            msgHashBuff,
+            signature.v,
+            ethUtil.toBuffer(signature.r),
+            ethUtil.toBuffer(signature.s),
+        );
+        const retrievedAddress = ethUtil.bufferToHex(ethUtil.pubToAddress(pubKey));
+        return retrievedAddress === signerAddress;
+    } catch (err) {
+        return false;
+    }
+}
+/**
+ * Signs an orderHash and returns it's elliptic curve signature.
+ * This method currently supports TestRPC, Geth and Parity above and below V1.6.6
+ * @param   orderHash       Hex encoded orderHash to sign.
+ * @param   signerAddress   The hex encoded Ethereum address you wish to sign it with. This address
+ *          must be available via the Provider supplied to 0x.js.
+ * @param   shouldAddPersonalMessagePrefix  Some signers add the personal message prefix `\x19Ethereum Signed Message`
+ *          themselves (e.g Parity Signer, Ledger, TestRPC) and others expect it to already be done by the client
+ *          (e.g Metamask). Depending on which signer this request is going to, decide on whether to add the prefix
+ *          before sending the request.
+ * @return  An object containing the Elliptic curve signature parameters generated by signing the orderHash.
+ */
+export async function signOrderHashAsync(
+    provider: Provider,
+    orderHash: string,
+    signerAddress: string,
+    shouldAddPersonalMessagePrefix: boolean,
+): Promise<ECSignature> {
+    assert.isHexString('orderHash', orderHash);
+    const web3Wrapper = new Web3Wrapper(provider);
+    await assert.isSenderAddressAsync('signerAddress', signerAddress, web3Wrapper);
+    const normalizedSignerAddress = signerAddress.toLowerCase();
+
+    let msgHashHex = orderHash;
+    if (shouldAddPersonalMessagePrefix) {
+        const orderHashBuff = ethUtil.toBuffer(orderHash);
+        const msgHashBuff = ethUtil.hashPersonalMessage(orderHashBuff);
+        msgHashHex = ethUtil.bufferToHex(msgHashBuff);
+    }
+
+    const signature = await web3Wrapper.signMessageAsync(normalizedSignerAddress, msgHashHex);
+
+    // HACK: There is no consensus on whether the signatureHex string should be formatted as
+    // v + r + s OR r + s + v, and different clients (even different versions of the same client)
+    // return the signature params in different orders. In order to support all client implementations,
+    // we parse the signature in both ways, and evaluate if either one is a valid signature.
+    const validVParamValues = [27, 28];
+    const ecSignatureVRS = parseSignatureHexAsVRS(signature);
+    if (_.includes(validVParamValues, ecSignatureVRS.v)) {
+        const isValidVRSSignature = isValidSignature(orderHash, ecSignatureVRS, normalizedSignerAddress);
+        if (isValidVRSSignature) {
+            return ecSignatureVRS;
+        }
+    }
+
+    const ecSignatureRSV = parseSignatureHexAsRSV(signature);
+    if (_.includes(validVParamValues, ecSignatureRSV.v)) {
+        const isValidRSVSignature = isValidSignature(orderHash, ecSignatureRSV, normalizedSignerAddress);
+        if (isValidRSVSignature) {
+            return ecSignatureRSV;
+        }
+    }
+
+    throw new Error(OrderError.InvalidSignature);
+}
+
+function parseSignatureHexAsVRS(signatureHex: string): ECSignature {
+    const signatureBuffer = ethUtil.toBuffer(signatureHex);
+    let v = signatureBuffer[0];
+    if (v < 27) {
+        v += 27;
+    }
+    const r = signatureBuffer.slice(1, 33);
+    const s = signatureBuffer.slice(33, 65);
+    const ecSignature: ECSignature = {
+        v,
+        r: ethUtil.bufferToHex(r),
+        s: ethUtil.bufferToHex(s),
+    };
+    return ecSignature;
+}
+
+function parseSignatureHexAsRSV(signatureHex: string): ECSignature {
+    const { v, r, s } = ethUtil.fromRpcSig(signatureHex);
+    const ecSignature: ECSignature = {
+        v,
+        r: ethUtil.bufferToHex(r),
+        s: ethUtil.bufferToHex(s),
+    };
+    return ecSignature;
+}
diff --git a/packages/order-utils/src/types.ts b/packages/order-utils/src/types.ts
new file mode 100644
index 000000000..f79d52359
--- /dev/null
+++ b/packages/order-utils/src/types.ts
@@ -0,0 +1,3 @@
+export enum OrderError {
+    InvalidSignature = 'INVALID_SIGNATURE',
+}
diff --git a/packages/order-utils/test/assert_test.ts b/packages/order-utils/test/assert_test.ts
new file mode 100644
index 000000000..dfd19bf86
--- /dev/null
+++ b/packages/order-utils/test/assert_test.ts
@@ -0,0 +1,35 @@
+import { web3Factory } from '@0xproject/dev-utils';
+import * as chai from 'chai';
+import 'mocha';
+
+import { assert } from '../src/assert';
+
+import { chaiSetup } from './utils/chai_setup';
+import { web3Wrapper } from './utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('Assertion library', () => {
+    describe('#isSenderAddressHexAsync', () => {
+        it('throws when address is invalid', async () => {
+            const address = '0xdeadbeef';
+            const varName = 'address';
+            return expect(assert.isSenderAddressAsync(varName, address, web3Wrapper)).to.be.rejectedWith(
+                `Expected ${varName} to be of type ETHAddressHex, encountered: ${address}`,
+            );
+        });
+        it('throws when address is unavailable', async () => {
+            const validUnrelatedAddress = '0x8b0292b11a196601eddce54b665cafeca0347d42';
+            const varName = 'address';
+            return expect(assert.isSenderAddressAsync(varName, validUnrelatedAddress, web3Wrapper)).to.be.rejectedWith(
+                `Specified ${varName} ${validUnrelatedAddress} isn't available through the supplied web3 provider`,
+            );
+        });
+        it("doesn't throw if address is available", async () => {
+            const availableAddress = (await web3Wrapper.getAvailableAddressesAsync())[0];
+            const varName = 'address';
+            return expect(assert.isSenderAddressAsync(varName, availableAddress, web3Wrapper)).to.become(undefined);
+        });
+    });
+});
diff --git a/packages/order-utils/test/order_hash_test.ts b/packages/order-utils/test/order_hash_test.ts
new file mode 100644
index 000000000..b6dda1a43
--- /dev/null
+++ b/packages/order-utils/test/order_hash_test.ts
@@ -0,0 +1,46 @@
+import { web3Factory } from '@0xproject/dev-utils';
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+import 'mocha';
+
+import { constants, getOrderHashHex } from '../src';
+
+import { chaiSetup } from './utils/chai_setup';
+import { web3Wrapper } from './utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('Order hashing', () => {
+    describe('#getOrderHashHex', () => {
+        const expectedOrderHash = '0x39da987067a3c9e5f1617694f1301326ba8c8b0498ebef5df4863bed394e3c83';
+        const fakeExchangeContractAddress = '0xb69e673309512a9d726f87304c6984054f87a93b';
+        const order = {
+            maker: constants.NULL_ADDRESS,
+            taker: constants.NULL_ADDRESS,
+            feeRecipient: constants.NULL_ADDRESS,
+            makerTokenAddress: constants.NULL_ADDRESS,
+            takerTokenAddress: constants.NULL_ADDRESS,
+            exchangeContractAddress: fakeExchangeContractAddress,
+            salt: new BigNumber(0),
+            makerFee: new BigNumber(0),
+            takerFee: new BigNumber(0),
+            makerTokenAmount: new BigNumber(0),
+            takerTokenAmount: new BigNumber(0),
+            expirationUnixTimestampSec: new BigNumber(0),
+        };
+        it('calculates the order hash', async () => {
+            const orderHash = getOrderHashHex(order);
+            expect(orderHash).to.be.equal(expectedOrderHash);
+        });
+        it('throws a readable error message if taker format is invalid', async () => {
+            const orderWithInvalidtakerFormat = {
+                ...order,
+                taker: (null as any) as string,
+            };
+            const expectedErrorMessage =
+                'Order taker must be of type string. If you want anyone to be able to fill an order - pass ZeroEx.NULL_ADDRESS';
+            expect(() => getOrderHashHex(orderWithInvalidtakerFormat)).to.throw(expectedErrorMessage);
+        });
+    });
+});
diff --git a/packages/order-utils/test/signature_utils_test.ts b/packages/order-utils/test/signature_utils_test.ts
new file mode 100644
index 000000000..7af67ae2e
--- /dev/null
+++ b/packages/order-utils/test/signature_utils_test.ts
@@ -0,0 +1,157 @@
+import { web3Factory } from '@0xproject/dev-utils';
+import { JSONRPCErrorCallback, JSONRPCRequestPayload } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+import * as _ from 'lodash';
+import 'mocha';
+import * as Sinon from 'sinon';
+
+import { generatePseudoRandomSalt, isValidOrderHash, isValidSignature, signOrderHashAsync } from '../src';
+
+import { chaiSetup } from './utils/chai_setup';
+import { provider, web3Wrapper } from './utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+const SHOULD_ADD_PERSONAL_MESSAGE_PREFIX = false;
+
+describe('Signature utils', () => {
+    describe('#isValidSignature', () => {
+        // The Exchange smart contract `isValidSignature` method only validates orderHashes and assumes
+        // the length of the data is exactly 32 bytes. Thus for these tests, we use data of this size.
+        const dataHex = '0x6927e990021d23b1eb7b8789f6a6feaf98fe104bb0cf8259421b79f9a34222b0';
+        const signature = {
+            v: 27,
+            r: '0x61a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
+            s: '0x40349190569279751135161d22529dc25add4f6069af05be04cacbda2ace2254',
+        };
+        const address = '0x5409ed021d9299bf6814279a6a1411a7e866a631';
+        it("should return false if the data doesn't pertain to the signature & address", async () => {
+            expect(isValidSignature('0x0', signature, address)).to.be.false();
+        });
+        it("should return false if the address doesn't pertain to the signature & data", async () => {
+            const validUnrelatedAddress = '0x8b0292b11a196601ed2ce54b665cafeca0347d42';
+            expect(isValidSignature(dataHex, signature, validUnrelatedAddress)).to.be.false();
+        });
+        it("should return false if the signature doesn't pertain to the dataHex & address", async () => {
+            const wrongSignature = _.assign({}, signature, { v: 28 });
+            expect(isValidSignature(dataHex, wrongSignature, address)).to.be.false();
+        });
+        it('should return true if the signature does pertain to the dataHex & address', async () => {
+            const isValidSignatureLocal = isValidSignature(dataHex, signature, address);
+            expect(isValidSignatureLocal).to.be.true();
+        });
+    });
+    describe('#generateSalt', () => {
+        it('generates different salts', () => {
+            const equal = generatePseudoRandomSalt().eq(generatePseudoRandomSalt());
+            expect(equal).to.be.false();
+        });
+        it('generates salt in range [0..2^256)', () => {
+            const salt = generatePseudoRandomSalt();
+            expect(salt.greaterThanOrEqualTo(0)).to.be.true();
+            const twoPow256 = new BigNumber(2).pow(256);
+            expect(salt.lessThan(twoPow256)).to.be.true();
+        });
+    });
+    describe('#isValidOrderHash', () => {
+        it('returns false if the value is not a hex string', () => {
+            const isValid = isValidOrderHash('not a hex');
+            expect(isValid).to.be.false();
+        });
+        it('returns false if the length is wrong', () => {
+            const isValid = isValidOrderHash('0xdeadbeef');
+            expect(isValid).to.be.false();
+        });
+        it('returns true if order hash is correct', () => {
+            const isValid = isValidOrderHash('0x' + Array(65).join('0'));
+            expect(isValid).to.be.true();
+        });
+    });
+    describe('#signOrderHashAsync', () => {
+        let stubs: Sinon.SinonStub[] = [];
+        let makerAddress: string;
+        before(async () => {
+            const availableAddreses = await web3Wrapper.getAvailableAddressesAsync();
+            makerAddress = availableAddreses[0];
+        });
+        afterEach(() => {
+            // clean up any stubs after the test has completed
+            _.each(stubs, s => s.restore());
+            stubs = [];
+        });
+        it('Should return the correct ECSignature', async () => {
+            const orderHash = '0x6927e990021d23b1eb7b8789f6a6feaf98fe104bb0cf8259421b79f9a34222b0';
+            const expectedECSignature = {
+                v: 27,
+                r: '0x61a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc33',
+                s: '0x40349190569279751135161d22529dc25add4f6069af05be04cacbda2ace2254',
+            };
+            const ecSignature = await signOrderHashAsync(
+                provider,
+                orderHash,
+                makerAddress,
+                SHOULD_ADD_PERSONAL_MESSAGE_PREFIX,
+            );
+            expect(ecSignature).to.deep.equal(expectedECSignature);
+        });
+        it('should return the correct ECSignature for signatureHex concatenated as R + S + V', async () => {
+            const orderHash = '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004';
+            const signature =
+                '0x22109d11d79cb8bf96ed88625e1cd9558800c4073332a9a02857499883ee5ce3050aa3cc1f2c435e67e114cdce54b9527b4f50548342401bc5d2b77adbdacb021b';
+            const expectedECSignature = {
+                v: 27,
+                r: '0x22109d11d79cb8bf96ed88625e1cd9558800c4073332a9a02857499883ee5ce3',
+                s: '0x050aa3cc1f2c435e67e114cdce54b9527b4f50548342401bc5d2b77adbdacb02',
+            };
+            stubs = [Sinon.stub('isValidSignature').returns(true)];
+
+            const fakeProvider = {
+                sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback) {
+                    if (payload.method === 'eth_sign') {
+                        callback(null, { id: 42, jsonrpc: '2.0', result: signature });
+                    } else {
+                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
+                    }
+                },
+            };
+
+            const ecSignature = await signOrderHashAsync(
+                fakeProvider,
+                orderHash,
+                makerAddress,
+                SHOULD_ADD_PERSONAL_MESSAGE_PREFIX,
+            );
+            expect(ecSignature).to.deep.equal(expectedECSignature);
+        });
+        it('should return the correct ECSignature for signatureHex concatenated as V + R + S', async () => {
+            const orderHash = '0xc793e33ffded933b76f2f48d9aa3339fc090399d5e7f5dec8d3660f5480793f7';
+            const signature =
+                '0x1bc80bedc6756722672753413efdd749b5adbd4fd552595f59c13427407ee9aee02dea66f25a608bbae457e020fb6decb763deb8b7192abab624997242da248960';
+            const expectedECSignature = {
+                v: 27,
+                r: '0xc80bedc6756722672753413efdd749b5adbd4fd552595f59c13427407ee9aee0',
+                s: '0x2dea66f25a608bbae457e020fb6decb763deb8b7192abab624997242da248960',
+            };
+            stubs = [Sinon.stub('isValidSignature').returns(true)];
+            const fakeProvider = {
+                sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback) {
+                    if (payload.method === 'eth_sign') {
+                        callback(null, { id: 42, jsonrpc: '2.0', result: signature });
+                    } else {
+                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
+                    }
+                },
+            };
+
+            const ecSignature = await signOrderHashAsync(
+                fakeProvider,
+                orderHash,
+                makerAddress,
+                SHOULD_ADD_PERSONAL_MESSAGE_PREFIX,
+            );
+            expect(ecSignature).to.deep.equal(expectedECSignature);
+        });
+    });
+});
diff --git a/packages/order-utils/test/utils/chai_setup.ts b/packages/order-utils/test/utils/chai_setup.ts
new file mode 100644
index 000000000..078edd309
--- /dev/null
+++ b/packages/order-utils/test/utils/chai_setup.ts
@@ -0,0 +1,13 @@
+import * as chai from 'chai';
+import chaiAsPromised = require('chai-as-promised');
+import ChaiBigNumber = require('chai-bignumber');
+import * as dirtyChai from 'dirty-chai';
+
+export const chaiSetup = {
+    configure() {
+        chai.config.includeStack = true;
+        chai.use(ChaiBigNumber());
+        chai.use(dirtyChai);
+        chai.use(chaiAsPromised);
+    },
+};
diff --git a/packages/order-utils/test/utils/web3_wrapper.ts b/packages/order-utils/test/utils/web3_wrapper.ts
new file mode 100644
index 000000000..b0ccfa546
--- /dev/null
+++ b/packages/order-utils/test/utils/web3_wrapper.ts
@@ -0,0 +1,9 @@
+import { devConstants, web3Factory } from '@0xproject/dev-utils';
+import { Provider } from '@0xproject/types';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+
+const web3 = web3Factory.create({ shouldUseInProcessGanache: true });
+const provider: Provider = web3.currentProvider;
+const web3Wrapper = new Web3Wrapper(web3.currentProvider);
+
+export { provider, web3Wrapper };
diff --git a/packages/order-utils/tsconfig.json b/packages/order-utils/tsconfig.json
new file mode 100644
index 000000000..8b4cd47a2
--- /dev/null
+++ b/packages/order-utils/tsconfig.json
@@ -0,0 +1,7 @@
+{
+    "extends": "../../tsconfig",
+    "compilerOptions": {
+        "outDir": "lib"
+    },
+    "include": ["src/**/*", "test/**/*"]
+}
diff --git a/packages/order-utils/tslint.json b/packages/order-utils/tslint.json
new file mode 100644
index 000000000..ffaefe83a
--- /dev/null
+++ b/packages/order-utils/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": ["@0xproject/tslint-config"]
+}
diff --git a/packages/react-docs/src/types.ts b/packages/react-docs/src/types.ts
index 3b4a57ad5..f4e61edc9 100644
--- a/packages/react-docs/src/types.ts
+++ b/packages/react-docs/src/types.ts
@@ -94,6 +94,7 @@ export enum KindString {
     Method = 'Method',
     Interface = 'Interface',
     TypeAlias = 'Type alias',
+    ObjectLiteral = 'Object literal',
     Variable = 'Variable',
     Function = 'Function',
     Enumeration = 'Enumeration',
diff --git a/packages/react-docs/src/utils/typedoc_utils.ts b/packages/react-docs/src/utils/typedoc_utils.ts
index 9c89b135a..0c7803a04 100644
--- a/packages/react-docs/src/utils/typedoc_utils.ts
+++ b/packages/react-docs/src/utils/typedoc_utils.ts
@@ -93,10 +93,16 @@ export const typeDocUtils = {
                 throw new Error('`react-docs` only supports projects with 1 exported class per file');
             }
             const isClassExport = packageDefinitionWithMergedChildren.children[0].kindString === KindString.Class;
+            const isObjectLiteralExport =
+                packageDefinitionWithMergedChildren.children[0].kindString === KindString.ObjectLiteral;
             if (isClassExport) {
                 entities = packageDefinitionWithMergedChildren.children[0].children;
                 const commentObj = packageDefinitionWithMergedChildren.children[0].comment;
                 packageComment = !_.isUndefined(commentObj) ? commentObj.shortText : packageComment;
+            } else if (isObjectLiteralExport) {
+                entities = packageDefinitionWithMergedChildren.children[0].children;
+                const commentObj = packageDefinitionWithMergedChildren.children[0].comment;
+                packageComment = !_.isUndefined(commentObj) ? commentObj.shortText : packageComment;
             } else {
                 entities = packageDefinitionWithMergedChildren.children;
             }
diff --git a/packages/website/md/docs/order_utils/installation.md b/packages/website/md/docs/order_utils/installation.md
new file mode 100644
index 000000000..68a7cf960
--- /dev/null
+++ b/packages/website/md/docs/order_utils/installation.md
@@ -0,0 +1,17 @@
+**Install**
+
+```bash
+yarn add @0xproject/order-utils
+```
+
+**Import**
+
+```javascript
+import { createSignedOrderAsync } from '@0xproject/order-utils';
+```
+
+or
+
+```javascript
+var createSignedOrderAsync = require('@0xproject/order-utils').createSignedOrderAsync;
+```
diff --git a/packages/website/md/docs/order_utils/introduction.md b/packages/website/md/docs/order_utils/introduction.md
new file mode 100644
index 000000000..d5f3f2925
--- /dev/null
+++ b/packages/website/md/docs/order_utils/introduction.md
@@ -0,0 +1 @@
+Welcome to the [@0xproject/order-utils](https://github.com/0xProject/0x-monorepo/tree/development/packages/order-utils) documentation! Order utils is a set of utils around creating, signing, validating 0x orders.
diff --git a/packages/website/ts/containers/order_utils_documentation.ts b/packages/website/ts/containers/order_utils_documentation.ts
new file mode 100644
index 000000000..64aa7300f
--- /dev/null
+++ b/packages/website/ts/containers/order_utils_documentation.ts
@@ -0,0 +1,99 @@
+import { constants as docConstants, DocsInfo, DocsInfoConfig, SupportedDocJson } from '@0xproject/react-docs';
+import * as _ from 'lodash';
+import * as React from 'react';
+import { connect } from 'react-redux';
+import { Dispatch } from 'redux';
+import { DocPage as DocPageComponent, DocPageProps } from 'ts/pages/documentation/doc_page';
+import { Dispatcher } from 'ts/redux/dispatcher';
+import { State } from 'ts/redux/reducer';
+import { DocPackages, Environments, WebsitePaths } from 'ts/types';
+import { configs } from 'ts/utils/configs';
+import { constants } from 'ts/utils/constants';
+import { Translate } from 'ts/utils/translate';
+
+/* tslint:disable:no-var-requires */
+const IntroMarkdown = require('md/docs/order_utils/introduction');
+const InstallationMarkdown = require('md/docs/order_utils/installation');
+/* tslint:enable:no-var-requires */
+
+const docSections = {
+    introduction: 'introduction',
+    installation: 'installation',
+    usage: 'usage',
+    types: 'types',
+};
+
+const docsInfoConfig: DocsInfoConfig = {
+    id: DocPackages.OrderUtils,
+    type: SupportedDocJson.TypeDoc,
+    displayName: 'Order utils',
+    packageUrl: 'https://github.com/0xProject/0x-monorepo',
+    menu: {
+        introduction: [docSections.introduction],
+        install: [docSections.installation],
+        usage: [docSections.usage],
+        types: [docSections.types],
+    },
+    sectionNameToMarkdown: {
+        [docSections.introduction]: IntroMarkdown,
+        [docSections.installation]: InstallationMarkdown,
+    },
+    sectionNameToModulePath: {
+        [docSections.usage]: [
+            '"order-utils/src/order_hash"',
+            '"order-utils/src/signature_utils"',
+            '"order-utils/src/order_factory"',
+            '"order-utils/src/salt"',
+            '"order-utils/src/assert"',
+            '"order-utils/src/constants"',
+        ],
+        [docSections.types]: ['"order-utils/src/types"', '"types/src/index"'],
+    },
+    menuSubsectionToVersionWhenIntroduced: {},
+    sections: docSections,
+    visibleConstructors: [],
+    typeConfigs: {
+        // Note: This needs to be kept in sync with the types exported in index.ts. Unfortunately there is
+        // currently no way to extract the re-exported types from index.ts via TypeDoc :(
+        publicTypes: [
+            'OrderError',
+            'Order',
+            'SignedOrder',
+            'ECSignature',
+            'Provider',
+            'JSONRPCRequestPayload',
+            'JSONRPCResponsePayload',
+            'JSONRPCErrorCallback',
+        ],
+        typeNameToExternalLink: {
+            BigNumber: constants.URL_BIGNUMBERJS_GITHUB,
+        },
+    },
+};
+const docsInfo = new DocsInfo(docsInfoConfig);
+
+interface ConnectedState {
+    docsVersion: string;
+    availableDocVersions: string[];
+    docsInfo: DocsInfo;
+    translate: Translate;
+}
+
+interface ConnectedDispatch {
+    dispatcher: Dispatcher;
+}
+
+const mapStateToProps = (state: State, ownProps: DocPageProps): ConnectedState => ({
+    docsVersion: state.docsVersion,
+    availableDocVersions: state.availableDocVersions,
+    translate: state.translate,
+    docsInfo,
+});
+
+const mapDispatchToProps = (dispatch: Dispatch<State>): ConnectedDispatch => ({
+    dispatcher: new Dispatcher(dispatch),
+});
+
+export const Documentation: React.ComponentClass<DocPageProps> = connect(mapStateToProps, mapDispatchToProps)(
+    DocPageComponent,
+);
diff --git a/packages/website/ts/index.tsx b/packages/website/ts/index.tsx
index d99187151..9535dd222 100644
--- a/packages/website/ts/index.tsx
+++ b/packages/website/ts/index.tsx
@@ -61,6 +61,9 @@ const LazySolCovDocumentation = createLazyComponent('Documentation', async () =>
 const LazySubprovidersDocumentation = createLazyComponent('Documentation', async () =>
     System.import<any>(/* webpackChunkName: "subproviderDocs" */ 'ts/containers/subproviders_documentation'),
 );
+const LazyOrderUtilsDocumentation = createLazyComponent('Documentation', async () =>
+    System.import<any>(/* webpackChunkName: "orderUtilsDocs" */ 'ts/containers/order_utils_documentation'),
+);
 
 analytics.init();
 // tslint:disable-next-line:no-floating-promises
@@ -94,6 +97,10 @@ render(
                                 component={LazySubprovidersDocumentation}
                             />
                             <Route
+                                path={`${WebsitePaths.OrderUtils}/:version?`}
+                                component={LazyOrderUtilsDocumentation}
+                            />
+                            <Route
                                 path={`${WebsitePaths.Web3Wrapper}/:version?`}
                                 component={LazyWeb3WrapperDocumentation}
                             />
diff --git a/packages/website/ts/pages/documentation/doc_page.tsx b/packages/website/ts/pages/documentation/doc_page.tsx
index aca20447b..9feb27dac 100644
--- a/packages/website/ts/pages/documentation/doc_page.tsx
+++ b/packages/website/ts/pages/documentation/doc_page.tsx
@@ -34,6 +34,7 @@ const docIdToSubpackageName: { [id: string]: string } = {
     [DocPackages.JSONSchemas]: 'json-schemas',
     [DocPackages.SolCov]: 'sol-cov',
     [DocPackages.Subproviders]: 'subproviders',
+    [DocPackages.OrderUtils]: 'order-utils',
 };
 
 export interface DocPageProps {
diff --git a/packages/website/ts/types.ts b/packages/website/ts/types.ts
index f4fddb556..fb4f22873 100644
--- a/packages/website/ts/types.ts
+++ b/packages/website/ts/types.ts
@@ -361,6 +361,7 @@ export enum WebsitePaths {
     JSONSchemas = '/docs/json-schemas',
     SolCov = '/docs/sol-cov',
     Subproviders = '/docs/subproviders',
+    OrderUtils = '/docs/order-utils',
     Jobs = '/jobs',
 }
 
@@ -373,6 +374,7 @@ export enum DocPackages {
     JSONSchemas = 'JSON_SCHEMAS',
     SolCov = 'SOL_COV',
     Subproviders = 'SUBPROVIDERS',
+    OrderUtils = 'ORDER_UTILS',
 }
 
 export enum Key {
diff --git a/packages/website/ts/utils/utils.ts b/packages/website/ts/utils/utils.ts
index 53d60b3ce..0d77b9e72 100644
--- a/packages/website/ts/utils/utils.ts
+++ b/packages/website/ts/utils/utils.ts
@@ -1,4 +1,5 @@
 import { ECSignature, ExchangeContractErrs, ZeroEx, ZeroExError } from '0x.js';
+import { OrderError } from '@0xproject/order-utils';
 import { constants as sharedConstants, EtherscanLinkSuffixes, Networks } from '@0xproject/react-shared';
 import { Provider } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
@@ -202,7 +203,7 @@ export const utils = {
             [ZeroExError.ZRXContractDoesNotExist]: 'ZRX contract does not exist',
             [ZeroExError.UnhandledError]: 'Unhandled error occured',
             [ZeroExError.UserHasNoAssociatedAddress]: 'User has no addresses available',
-            [ZeroExError.InvalidSignature]: 'Order signature is not valid',
+            [OrderError.InvalidSignature]: 'Order signature is not valid',
             [ZeroExError.ContractNotDeployedOnNetwork]: 'Contract is not deployed on the detected network',
             [ZeroExError.InvalidJump]: 'Invalid jump occured while executing the transaction',
             [ZeroExError.OutOfGas]: 'Transaction ran out of gas',