Merge pull request #507 from 0xProject/feature/subproviders/mnemonic-wallet-subprovider

Mnemonic wallet subprovider and multiple accounts in ledger

21 files changed, 704 insertions, 130 deletions

diff --git a/packages/subproviders/CHANGELOG.json b/packages/subproviders/CHANGELOG.json
index 6ab3e7093..d3ba7a928 100644
--- a/packages/subproviders/CHANGELOG.json
+++ b/packages/subproviders/CHANGELOG.json
@@ -8,8 +8,25 @@
                 "pr": 500
             },
             {
-                "note": "Add private key subprovider and refactor shared functionality into a base wallet subprovider",
+                "note": "Add PrivateKeySubprovider and refactor shared functionality into a base wallet subprovider",
                 "pr": 506
+            },
+            {
+                "note": "Add MnemonicWalletsubprovider, deprecating our truffle-hdwallet-provider fork",
+                "pr": 507
+            },
+            {
+                "note": "Support multiple addresses in ledger and mnemonic wallets",
+                "pr": 507
+            },
+            {
+                "note":
+                    "Refactors LedgerSubprovider such that explicitly setting the `pathIndex` is no longer required. Simply set the request `from` address as desired",
+                "pr": 507
+            },
+            {
+                "note": "Renamed derivationPath to baseDerivationPath.",
+                "pr": 507
             }
         ],
         "timestamp": 1523462196
diff --git a/packages/subproviders/package.json b/packages/subproviders/package.json
index 36133e417..c27b1d2fc 100644
--- a/packages/subproviders/package.json
+++ b/packages/subproviders/package.json
@@ -21,15 +21,14 @@
         "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"
+        "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": {
             "assets": [],
             "docPublishConfigs": {
-                "extraFileIncludes": [
-                    "../types/src/index.ts"
-                ],
+                "extraFileIncludes": ["../types/src/index.ts"],
                 "s3BucketPath": "s3://doc-jsons/subproviders/",
                 "s3StagingBucketPath": "s3://staging-doc-jsons/subproviders/"
             }
@@ -46,6 +45,7 @@
         "ethereumjs-tx": "^1.3.3",
         "ethereumjs-util": "^5.1.1",
         "ganache-core": "0xProject/ganache-core",
+        "bip39": "^2.5.0",
         "hdkey": "^0.7.1",
         "lodash": "^4.17.4",
         "semaphore-async-await": "^1.5.1",
@@ -56,6 +56,7 @@
         "@0xproject/monorepo-scripts": "^0.1.17",
         "@0xproject/tslint-config": "^0.4.15",
         "@0xproject/utils": "^0.5.1",
+        "@types/bip39": "^2.4.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^2.2.42",
         "@types/node": "^8.0.53",
diff --git a/packages/subproviders/src/globals.d.ts b/packages/subproviders/src/globals.d.ts
index c5ad26876..4b3ecdf3c 100644
--- a/packages/subproviders/src/globals.d.ts
+++ b/packages/subproviders/src/globals.d.ts
@@ -51,17 +51,6 @@ declare module '@ledgerhq/hw-transport-node-hid' {
     }
 }
 
-// hdkey declarations
-declare module 'hdkey' {
-    class HDNode {
-        public publicKey: Buffer;
-        public chainCode: Buffer;
-        public constructor();
-        public derive(path: string): HDNode;
-    }
-    export = HDNode;
-}
-
 declare module '*.json' {
     const json: any;
     /* tslint:disable */
diff --git a/packages/subproviders/src/index.ts b/packages/subproviders/src/index.ts
index b84473e45..ff28b8a8d 100644
--- a/packages/subproviders/src/index.ts
+++ b/packages/subproviders/src/index.ts
@@ -12,12 +12,12 @@ export { LedgerSubprovider } from './subproviders/ledger';
 export { GanacheSubprovider } from './subproviders/ganache';
 export { Subprovider } from './subproviders/subprovider';
 export { NonceTrackerSubprovider } from './subproviders/nonce_tracker';
-export { PrivateKeyWalletSubprovider } from './subproviders/private_key_wallet_subprovider';
+export { PrivateKeyWalletSubprovider } from './subproviders/private_key_wallet';
+export { MnemonicWalletSubprovider } from './subproviders/mnemonic_wallet';
 export {
     Callback,
     ErrorCallback,
     NextCallback,
-    LedgerWalletSubprovider,
     LedgerCommunicationClient,
     NonceSubproviderErrors,
     LedgerSubproviderConfigs,
diff --git a/packages/subproviders/src/subproviders/base_wallet_subprovider.ts b/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
index 034f83e7f..0a9b99ae4 100644
--- a/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
+++ b/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
@@ -21,7 +21,7 @@ export abstract class BaseWalletSubprovider extends Subprovider {
 
     public abstract async getAccountsAsync(): Promise<string[]>;
     public abstract async signTransactionAsync(txParams: PartialTxParams): Promise<string>;
-    public abstract async signPersonalMessageAsync(data: string): Promise<string>;
+    public abstract async signPersonalMessageAsync(data: string, address: string): Promise<string>;
 
     /**
      * This method conforms to the web3-provider-engine interface.
@@ -85,8 +85,9 @@ export abstract class BaseWalletSubprovider extends Subprovider {
             case 'eth_sign':
             case 'personal_sign':
                 const data = payload.method === 'eth_sign' ? payload.params[1] : payload.params[0];
+                const address = payload.method === 'eth_sign' ? payload.params[0] : payload.params[1];
                 try {
-                    const ecSignatureHex = await this.signPersonalMessageAsync(data);
+                    const ecSignatureHex = await this.signPersonalMessageAsync(data, address);
                     end(null, ecSignatureHex);
                 } catch (err) {
                     end(err);
diff --git a/packages/subproviders/src/subproviders/ledger.ts b/packages/subproviders/src/subproviders/ledger.ts
index aa86bf6c0..563e5a56a 100644
--- a/packages/subproviders/src/subproviders/ledger.ts
+++ b/packages/subproviders/src/subproviders/ledger.ts
@@ -1,5 +1,4 @@
 import { assert } from '@0xproject/assert';
-import { JSONRPCRequestPayload } from '@0xproject/types';
 import { addressUtils } from '@0xproject/utils';
 import EthereumTx = require('ethereumjs-tx');
 import ethUtil = require('ethereumjs-util');
@@ -9,6 +8,7 @@ import { Lock } from 'semaphore-async-await';
 
 import {
     Callback,
+    DerivedHDKeyInfo,
     LedgerEthereumClient,
     LedgerEthereumClientFactoryAsync,
     LedgerSubproviderConfigs,
@@ -17,13 +17,15 @@ import {
     ResponseWithTxParams,
     WalletSubproviderErrors,
 } from '../types';
+import { walletUtils } from '../utils/wallet_utils';
 
 import { BaseWalletSubprovider } from './base_wallet_subprovider';
 
-const DEFAULT_DERIVATION_PATH = `44'/60'/0'`;
-const DEFAULT_NUM_ADDRESSES_TO_FETCH = 10;
+const DEFAULT_BASE_DERIVATION_PATH = `44'/60'/0'`;
 const ASK_FOR_ON_DEVICE_CONFIRMATION = false;
 const SHOULD_GET_CHAIN_CODE = true;
+const DEFAULT_NUM_ADDRESSES_TO_FETCH = 10;
+const DEFAULT_ADDRESS_SEARCH_LIMIT = 1000;
 
 /**
  * Subprovider for interfacing with a user's [Ledger Nano S](https://www.ledgerwallet.com/products/ledger-nano-s).
@@ -34,11 +36,11 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
     private _nonceLock = new Lock();
     private _connectionLock = new Lock();
     private _networkId: number;
-    private _derivationPath: string;
-    private _derivationPathIndex: number;
+    private _baseDerivationPath: string;
     private _ledgerEthereumClientFactoryAsync: LedgerEthereumClientFactoryAsync;
     private _ledgerClientIfExists?: LedgerEthereumClient;
     private _shouldAlwaysAskForConfirmation: boolean;
+    private _addressSearchLimit: number;
     /**
      * Instantiates a LedgerSubprovider. Defaults to derivationPath set to `44'/60'/0'`.
      * TestRPC/Ganache defaults to `m/44'/60'/0'/0`, so set this in the configs if desired.
@@ -49,40 +51,35 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
         super();
         this._networkId = config.networkId;
         this._ledgerEthereumClientFactoryAsync = config.ledgerEthereumClientFactoryAsync;
-        this._derivationPath = config.derivationPath || DEFAULT_DERIVATION_PATH;
+        this._baseDerivationPath = config.baseDerivationPath || DEFAULT_BASE_DERIVATION_PATH;
         this._shouldAlwaysAskForConfirmation =
             !_.isUndefined(config.accountFetchingConfigs) &&
             !_.isUndefined(config.accountFetchingConfigs.shouldAskForOnDeviceConfirmation)
                 ? config.accountFetchingConfigs.shouldAskForOnDeviceConfirmation
                 : ASK_FOR_ON_DEVICE_CONFIRMATION;
-        this._derivationPathIndex = 0;
+        this._addressSearchLimit =
+            !_.isUndefined(config.accountFetchingConfigs) &&
+            !_.isUndefined(config.accountFetchingConfigs.addressSearchLimit)
+                ? config.accountFetchingConfigs.addressSearchLimit
+                : DEFAULT_ADDRESS_SEARCH_LIMIT;
     }
     /**
      * Retrieve the set derivation path
      * @returns derivation path
      */
     public getPath(): string {
-        return this._derivationPath;
+        return this._baseDerivationPath;
     }
     /**
      * Set a desired derivation path when computing the available user addresses
-     * @param derivationPath The desired derivation path (e.g `44'/60'/0'`)
-     */
-    public setPath(derivationPath: string) {
-        this._derivationPath = derivationPath;
-    }
-    /**
-     * Set the final derivation path index. If a user wishes to sign a message with the
-     * 6th address in a derivation path, before calling `signPersonalMessageAsync`, you must
-     * call this method with pathIndex `6`.
-     * @param pathIndex Desired derivation path index
+     * @param basDerivationPath The desired derivation path (e.g `44'/60'/0'`)
      */
-    public setPathIndex(pathIndex: number) {
-        this._derivationPathIndex = pathIndex;
+    public setPath(basDerivationPath: string) {
+        this._baseDerivationPath = basDerivationPath;
     }
     /**
      * Retrieve a users Ledger accounts. The accounts are derived from the derivationPath,
-     * master public key and chainCode. Because of this, you can request as many accounts
+     * master public key and chain code. Because of this, you can request as many accounts
      * as you wish and it only requires a single request to the Ledger device. This method
      * is automatically called when issuing a `eth_accounts` JSON RPC request via your providerEngine
      * instance.
@@ -90,46 +87,27 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
      * @return An array of accounts
      */
     public async getAccountsAsync(numberOfAccounts: number = DEFAULT_NUM_ADDRESSES_TO_FETCH): Promise<string[]> {
-        this._ledgerClientIfExists = await this._createLedgerClientAsync();
-
-        let ledgerResponse;
-        try {
-            ledgerResponse = await this._ledgerClientIfExists.getAddress(
-                this._derivationPath,
-                this._shouldAlwaysAskForConfirmation,
-                SHOULD_GET_CHAIN_CODE,
-            );
-        } finally {
-            await this._destroyLedgerClientAsync();
-        }
-
-        const hdKey = new HDNode();
-        hdKey.publicKey = new Buffer(ledgerResponse.publicKey, 'hex');
-        hdKey.chainCode = new Buffer(ledgerResponse.chainCode, 'hex');
-
-        const accounts: string[] = [];
-        for (let i = 0; i < numberOfAccounts; i++) {
-            const derivedHDNode = hdKey.derive(`m/${i + this._derivationPathIndex}`);
-            const derivedPublicKey = derivedHDNode.publicKey;
-            const shouldSanitizePublicKey = true;
-            const ethereumAddressUnprefixed = ethUtil
-                .publicToAddress(derivedPublicKey, shouldSanitizePublicKey)
-                .toString('hex');
-            const ethereumAddressPrefixed = ethUtil.addHexPrefix(ethereumAddressUnprefixed);
-            accounts.push(ethereumAddressPrefixed.toLowerCase());
-        }
+        const initialDerivedKeyInfo = await this._initialDerivedKeyInfoAsync();
+        const derivedKeyInfos = walletUtils.calculateDerivedHDKeyInfos(initialDerivedKeyInfo, numberOfAccounts);
+        const accounts = _.map(derivedKeyInfos, k => k.address);
         return accounts;
     }
     /**
-     * Sign a transaction with the Ledger. If you've added the LedgerSubprovider to your
-     * app's provider, you can simply send an `eth_sendTransaction` JSON RPC request, and
-     * this method will be called auto-magically. If you are not using this via a ProviderEngine
+     * Signs a transaction on the Ledger with the account specificed by the `from` field in txParams.
+     * If you've added the LedgerSubprovider to your app's provider, you can simply send an `eth_sendTransaction`
+     * JSON RPC request, and this method will be called auto-magically. If you are not using this via a ProviderEngine
      * instance, you can call it directly.
      * @param txParams Parameters of the transaction to sign
      * @return Signed transaction hex string
      */
     public async signTransactionAsync(txParams: PartialTxParams): Promise<string> {
         LedgerSubprovider._validateTxParams(txParams);
+        if (_.isUndefined(txParams.from) || !addressUtils.isAddress(txParams.from)) {
+            throw new Error(WalletSubproviderErrors.FromAddressMissingOrInvalid);
+        }
+        const initialDerivedKeyInfo = await this._initialDerivedKeyInfoAsync();
+        const derivedKeyInfo = this._findDerivedKeyInfoForAddress(initialDerivedKeyInfo, txParams.from);
+
         this._ledgerClientIfExists = await this._createLedgerClientAsync();
 
         const tx = new EthereumTx(txParams);
@@ -141,8 +119,8 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
 
         const txHex = tx.serialize().toString('hex');
         try {
-            const derivationPath = this._getDerivationPath();
-            const result = await this._ledgerClientIfExists.signTransaction(derivationPath, txHex);
+            const fullDerivationPath = derivedKeyInfo.derivationPath;
+            const result = await this._ledgerClientIfExists.signTransaction(fullDerivationPath, txHex);
             // Store signature in transaction
             tx.r = Buffer.from(result.r, 'hex');
             tx.s = Buffer.from(result.s, 'hex');
@@ -165,25 +143,30 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
         }
     }
     /**
-     * Sign a personal Ethereum signed message. The signing address will be the one
-     * retrieved given a derivationPath and pathIndex set on the subprovider.
+     * Sign a personal Ethereum signed message. The signing account will be the account
+     * associated with the provided address.
      * The Ledger adds the Ethereum signed message prefix on-device.  If you've added
      * the LedgerSubprovider to your app's provider, you can simply send an `eth_sign`
      * or `personal_sign` JSON RPC request, and this method will be called auto-magically.
      * If you are not using this via a ProviderEngine instance, you can call it directly.
-     * @param data Message to sign
+     * @param data Hex string message to sign
+     * @param address Address of the account to sign with
      * @return Signature hex string (order: rsv)
      */
-    public async signPersonalMessageAsync(data: string): Promise<string> {
+    public async signPersonalMessageAsync(data: string, address: string): Promise<string> {
         if (_.isUndefined(data)) {
             throw new Error(WalletSubproviderErrors.DataMissingForSignPersonalMessage);
         }
         assert.isHexString('data', data);
+        assert.isETHAddressHex('address', address);
+        const initialDerivedKeyInfo = await this._initialDerivedKeyInfoAsync();
+        const derivedKeyInfo = this._findDerivedKeyInfoForAddress(initialDerivedKeyInfo, address);
+
         this._ledgerClientIfExists = await this._createLedgerClientAsync();
         try {
-            const derivationPath = this._getDerivationPath();
+            const fullDerivationPath = derivedKeyInfo.derivationPath;
             const result = await this._ledgerClientIfExists.signPersonalMessage(
-                derivationPath,
+                fullDerivationPath,
                 ethUtil.stripHexPrefix(data),
             );
             const v = result.v - 27;
@@ -199,10 +182,6 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
             throw err;
         }
     }
-    private _getDerivationPath() {
-        const derivationPath = `${this.getPath()}/${this._derivationPathIndex}`;
-        return derivationPath;
-    }
     private async _createLedgerClientAsync(): Promise<LedgerEthereumClient> {
         await this._connectionLock.acquire();
         if (!_.isUndefined(this._ledgerClientIfExists)) {
@@ -223,4 +202,41 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
         this._ledgerClientIfExists = undefined;
         this._connectionLock.release();
     }
+    private async _initialDerivedKeyInfoAsync(): Promise<DerivedHDKeyInfo> {
+        this._ledgerClientIfExists = await this._createLedgerClientAsync();
+
+        const parentKeyDerivationPath = `m/${this._baseDerivationPath}`;
+        let ledgerResponse;
+        try {
+            ledgerResponse = await this._ledgerClientIfExists.getAddress(
+                parentKeyDerivationPath,
+                this._shouldAlwaysAskForConfirmation,
+                SHOULD_GET_CHAIN_CODE,
+            );
+        } finally {
+            await this._destroyLedgerClientAsync();
+        }
+        const hdKey = new HDNode();
+        hdKey.publicKey = new Buffer(ledgerResponse.publicKey, 'hex');
+        hdKey.chainCode = new Buffer(ledgerResponse.chainCode, 'hex');
+        const address = walletUtils.addressOfHDKey(hdKey);
+        const initialDerivedKeyInfo = {
+            hdKey,
+            address,
+            derivationPath: parentKeyDerivationPath,
+            baseDerivationPath: this._baseDerivationPath,
+        };
+        return initialDerivedKeyInfo;
+    }
+    private _findDerivedKeyInfoForAddress(initalHDKey: DerivedHDKeyInfo, address: string): DerivedHDKeyInfo {
+        const matchedDerivedKeyInfo = walletUtils.findDerivedKeyInfoForAddressIfExists(
+            address,
+            initalHDKey,
+            this._addressSearchLimit,
+        );
+        if (_.isUndefined(matchedDerivedKeyInfo)) {
+            throw new Error(`${WalletSubproviderErrors.AddressNotFound}: ${address}`);
+        }
+        return matchedDerivedKeyInfo;
+    }
 }
diff --git a/packages/subproviders/src/subproviders/mnemonic_wallet.ts b/packages/subproviders/src/subproviders/mnemonic_wallet.ts
new file mode 100644
index 000000000..080bfeb4c
--- /dev/null
+++ b/packages/subproviders/src/subproviders/mnemonic_wallet.ts
@@ -0,0 +1,145 @@
+import { assert } from '@0xproject/assert';
+import { addressUtils } from '@0xproject/utils';
+import * as bip39 from 'bip39';
+import ethUtil = require('ethereumjs-util');
+import HDNode = require('hdkey');
+import * as _ from 'lodash';
+
+import { DerivedHDKeyInfo, MnemonicWalletSubproviderConfigs, PartialTxParams, WalletSubproviderErrors } from '../types';
+import { walletUtils } from '../utils/wallet_utils';
+
+import { BaseWalletSubprovider } from './base_wallet_subprovider';
+import { PrivateKeyWalletSubprovider } from './private_key_wallet';
+
+const DEFAULT_BASE_DERIVATION_PATH = `44'/60'/0'/0`;
+const DEFAULT_NUM_ADDRESSES_TO_FETCH = 10;
+const DEFAULT_ADDRESS_SEARCH_LIMIT = 1000;
+
+/**
+ * This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
+ * This subprovider intercepts all account related RPC requests (e.g message/transaction signing, etc...) and handles
+ * all requests with accounts derived from the supplied mnemonic.
+ */
+export class MnemonicWalletSubprovider extends BaseWalletSubprovider {
+    private _addressSearchLimit: number;
+    private _baseDerivationPath: string;
+    private _derivedKeyInfo: DerivedHDKeyInfo;
+    private _mnemonic: string;
+
+    /**
+     * Instantiates a MnemonicWalletSubprovider. Defaults to baseDerivationPath set to `44'/60'/0'/0`.
+     * This is the default in TestRPC/Ganache, it can be overridden if desired.
+     * @param config Configuration for the mnemonic wallet, must contain the mnemonic
+     * @return MnemonicWalletSubprovider instance
+     */
+    constructor(config: MnemonicWalletSubproviderConfigs) {
+        assert.isString('mnemonic', config.mnemonic);
+        const baseDerivationPath = config.baseDerivationPath || DEFAULT_BASE_DERIVATION_PATH;
+        assert.isString('baseDerivationPath', baseDerivationPath);
+        const addressSearchLimit = config.addressSearchLimit || DEFAULT_ADDRESS_SEARCH_LIMIT;
+        assert.isNumber('addressSearchLimit', addressSearchLimit);
+        super();
+
+        this._mnemonic = config.mnemonic;
+        this._baseDerivationPath = baseDerivationPath;
+        this._addressSearchLimit = addressSearchLimit;
+        this._derivedKeyInfo = this._initialDerivedKeyInfo(this._baseDerivationPath);
+    }
+    /**
+     * Retrieve the set derivation path
+     * @returns derivation path
+     */
+    public getPath(): string {
+        return this._baseDerivationPath;
+    }
+    /**
+     * Set a desired derivation path when computing the available user addresses
+     * @param baseDerivationPath The desired derivation path (e.g `44'/60'/0'`)
+     */
+    public setPath(baseDerivationPath: string) {
+        this._baseDerivationPath = baseDerivationPath;
+        this._derivedKeyInfo = this._initialDerivedKeyInfo(this._baseDerivationPath);
+    }
+    /**
+     * Retrieve the accounts associated with the mnemonic.
+     * This method is implicitly called when issuing a `eth_accounts` JSON RPC request
+     * via your providerEngine instance.
+     * @param numberOfAccounts Number of accounts to retrieve (default: 10)
+     * @return An array of accounts
+     */
+    public async getAccountsAsync(numberOfAccounts: number = DEFAULT_NUM_ADDRESSES_TO_FETCH): Promise<string[]> {
+        const derivedKeys = walletUtils.calculateDerivedHDKeyInfos(this._derivedKeyInfo, numberOfAccounts);
+        const accounts = _.map(derivedKeys, k => k.address);
+        return accounts;
+    }
+
+    /**
+     * Signs a transaction with the account specificed by the `from` field in txParams.
+     * If you've added this Subprovider to your  app's provider, you can simply send
+     * an `eth_sendTransaction` JSON RPC request, and this method will be called auto-magically.
+     * If you are not using this via a ProviderEngine instance, you can call it directly.
+     * @param txParams Parameters of the transaction to sign
+     * @return Signed transaction hex string
+     */
+    public async signTransactionAsync(txParams: PartialTxParams): Promise<string> {
+        if (_.isUndefined(txParams.from) || !addressUtils.isAddress(txParams.from)) {
+            throw new Error(WalletSubproviderErrors.FromAddressMissingOrInvalid);
+        }
+        const privateKeyWallet = this._privateKeyWalletForAddress(txParams.from);
+        const signedTx = privateKeyWallet.signTransactionAsync(txParams);
+        return signedTx;
+    }
+    /**
+     * Sign a personal Ethereum signed message. The signing account will be the account
+     * associated with the provided address.
+     * If you've added the MnemonicWalletSubprovider to your app's provider, you can simply send an `eth_sign`
+     * or `personal_sign` JSON RPC request, and this method will be called auto-magically.
+     * If you are not using this via a ProviderEngine instance, you can call it directly.
+     * @param data Hex string message to sign
+     * @param address Address of the account to sign with
+     * @return Signature hex string (order: rsv)
+     */
+    public async signPersonalMessageAsync(data: string, address: string): Promise<string> {
+        if (_.isUndefined(data)) {
+            throw new Error(WalletSubproviderErrors.DataMissingForSignPersonalMessage);
+        }
+        assert.isHexString('data', data);
+        assert.isETHAddressHex('address', address);
+        const privateKeyWallet = this._privateKeyWalletForAddress(address);
+        const sig = await privateKeyWallet.signPersonalMessageAsync(data, address);
+        return sig;
+    }
+    private _privateKeyWalletForAddress(address: string): PrivateKeyWalletSubprovider {
+        const derivedKeyInfo = this._findDerivedKeyInfoForAddress(address);
+        const privateKeyHex = derivedKeyInfo.hdKey.privateKey.toString('hex');
+        const privateKeyWallet = new PrivateKeyWalletSubprovider(privateKeyHex);
+        return privateKeyWallet;
+    }
+    private _findDerivedKeyInfoForAddress(address: string): DerivedHDKeyInfo {
+        const matchedDerivedKeyInfo = walletUtils.findDerivedKeyInfoForAddressIfExists(
+            address,
+            this._derivedKeyInfo,
+            this._addressSearchLimit,
+        );
+        if (_.isUndefined(matchedDerivedKeyInfo)) {
+            throw new Error(`${WalletSubproviderErrors.AddressNotFound}: ${address}`);
+        }
+        return matchedDerivedKeyInfo;
+    }
+    private _initialDerivedKeyInfo(baseDerivationPath: string): DerivedHDKeyInfo {
+        const seed = bip39.mnemonicToSeed(this._mnemonic);
+        const hdKey = HDNode.fromMasterSeed(seed);
+        // Walk down to base derivation level (i.e m/44'/60'/0') and create an initial key at that level
+        // all children will then be walked relative (i.e m/0)
+        const parentKeyDerivationPath = `m/${baseDerivationPath}`;
+        const parentHDKeyAtDerivationPath = hdKey.derive(parentKeyDerivationPath);
+        const address = walletUtils.addressOfHDKey(parentHDKeyAtDerivationPath);
+        const derivedKeyInfo = {
+            address,
+            baseDerivationPath,
+            derivationPath: parentKeyDerivationPath,
+            hdKey: parentHDKeyAtDerivationPath,
+        };
+        return derivedKeyInfo;
+    }
+}
diff --git a/packages/subproviders/src/subproviders/private_key_wallet_subprovider.ts b/packages/subproviders/src/subproviders/private_key_wallet.ts
index c3a53773a..b3f48fd90 100644
--- a/packages/subproviders/src/subproviders/private_key_wallet_subprovider.ts
+++ b/packages/subproviders/src/subproviders/private_key_wallet.ts
@@ -1,13 +1,11 @@
 import { assert } from '@0xproject/assert';
-import { JSONRPCRequestPayload } from '@0xproject/types';
 import EthereumTx = require('ethereumjs-tx');
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 
-import { Callback, ErrorCallback, PartialTxParams, ResponseWithTxParams, WalletSubproviderErrors } from '../types';
+import { PartialTxParams, WalletSubproviderErrors } from '../types';
 
 import { BaseWalletSubprovider } from './base_wallet_subprovider';
-import { Subprovider } from './subprovider';
 
 /**
  * This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
@@ -17,6 +15,11 @@ import { Subprovider } from './subprovider';
 export class PrivateKeyWalletSubprovider extends BaseWalletSubprovider {
     private _address: string;
     private _privateKeyBuffer: Buffer;
+    /**
+     * Instantiates a PrivateKeyWalletSubprovider.
+     * @param privateKey The corresponding private key to an Ethereum address
+     * @return PrivateKeyWalletSubprovider instance
+     */
     constructor(privateKey: string) {
         assert.isString('privateKey', privateKey);
         super();
@@ -42,26 +45,40 @@ export class PrivateKeyWalletSubprovider extends BaseWalletSubprovider {
      */
     public async signTransactionAsync(txParams: PartialTxParams): Promise<string> {
         PrivateKeyWalletSubprovider._validateTxParams(txParams);
+        if (!_.isUndefined(txParams.from) && txParams.from !== this._address) {
+            throw new Error(
+                `Requested to sign transaction with address: ${txParams.from}, instantiated with address: ${
+                    this._address
+                }`,
+            );
+        }
         const tx = new EthereumTx(txParams);
         tx.sign(this._privateKeyBuffer);
         const rawTx = `0x${tx.serialize().toString('hex')}`;
         return rawTx;
     }
     /**
-     * Sign a personal Ethereum signed message. The signing address will be
-     * calculated from the private key.
-     * If you've added the PKWalletSubprovider to your app's provider, you can simply send an `eth_sign`
+     * Sign a personal Ethereum signed message. The signing address will be calculated from the private key.
+     * The address must be provided it must match the address calculated from the private key.
+     * If you've added this Subprovider to your app's provider, you can simply send an `eth_sign`
      * or `personal_sign` JSON RPC request, and this method will be called auto-magically.
      * If you are not using this via a ProviderEngine instance, you can call it directly.
-     * @param data Message to sign
+     * @param data Hex string message to sign
+     * @param address Address of the account to sign with
      * @return Signature hex string (order: rsv)
      */
-    public async signPersonalMessageAsync(dataIfExists: string): Promise<string> {
-        if (_.isUndefined(dataIfExists)) {
+    public async signPersonalMessageAsync(data: string, address: string): Promise<string> {
+        if (_.isUndefined(data)) {
             throw new Error(WalletSubproviderErrors.DataMissingForSignPersonalMessage);
         }
-        assert.isHexString('data', dataIfExists);
-        const dataBuff = ethUtil.toBuffer(dataIfExists);
+        assert.isHexString('data', data);
+        assert.isETHAddressHex('address', address);
+        if (address !== this._address) {
+            throw new Error(
+                `Requested to sign message with address: ${address}, instantiated with address: ${this._address}`,
+            );
+        }
+        const dataBuff = ethUtil.toBuffer(data);
         const msgHashBuff = ethUtil.hashPersonalMessage(dataBuff);
         const sig = ethUtil.ecsign(msgHashBuff, this._privateKeyBuffer);
         const rpcSig = ethUtil.toRpcSig(sig.v, sig.r, sig.s);
diff --git a/packages/subproviders/src/types.ts b/packages/subproviders/src/types.ts
index bacb7091b..74ecec23b 100644
--- a/packages/subproviders/src/types.ts
+++ b/packages/subproviders/src/types.ts
@@ -1,4 +1,5 @@
 import { ECSignature, JSONRPCRequestPayload } from '@0xproject/types';
+import HDNode = require('hdkey');
 import * as _ from 'lodash';
 
 export interface LedgerCommunicationClient {
@@ -40,20 +41,33 @@ export type LedgerEthereumClientFactoryAsync = () => Promise<LedgerEthereumClien
 export interface LedgerSubproviderConfigs {
     networkId: number;
     ledgerEthereumClientFactoryAsync: LedgerEthereumClientFactoryAsync;
-    derivationPath?: string;
+    baseDerivationPath?: string;
     accountFetchingConfigs?: AccountFetchingConfigs;
 }
 
 /*
+ * addressSearchLimit: The maximum number of addresses to search through, defaults to 1000
  * numAddressesToReturn: Number of addresses to return from 'eth_accounts' call
  * shouldAskForOnDeviceConfirmation: Whether you wish to prompt the user on their Ledger
  *                                   before fetching their addresses
  */
 export interface AccountFetchingConfigs {
+    addressSearchLimit?: number;
     numAddressesToReturn?: number;
     shouldAskForOnDeviceConfirmation?: boolean;
 }
 
+/*
+ * mnemonic: The string mnemonic seed
+ * addressSearchLimit: The maximum number of addresses to search through, defaults to 1000
+ * baseDerivationPath: The base derivation path (e.g 44'/60'/0'/0)
+ */
+export interface MnemonicWalletSubproviderConfigs {
+    mnemonic: string;
+    addressSearchLimit?: number;
+    baseDerivationPath?: string;
+}
+
 export interface SignatureData {
     hash: string;
     r: string;
@@ -67,18 +81,12 @@ export interface LedgerGetAddressResult {
     chainCode: string;
 }
 
-export interface LedgerWalletSubprovider {
-    getPath: () => string;
-    setPath: (path: string) => void;
-    setPathIndex: (pathIndex: number) => void;
-}
-
 export interface PartialTxParams {
     nonce: string;
     gasPrice?: string;
     gas: string;
     to: string;
-    from?: string;
+    from: string;
     value?: string;
     data?: string;
     chainId: number; // EIP 155 chainId - mainnet: 1, ropsten: 3
@@ -96,12 +104,13 @@ export interface ResponseWithTxParams {
 }
 
 export enum WalletSubproviderErrors {
+    AddressNotFound = 'ADDRESS_NOT_FOUND',
     DataMissingForSignPersonalMessage = 'DATA_MISSING_FOR_SIGN_PERSONAL_MESSAGE',
     SenderInvalidOrNotSupplied = 'SENDER_INVALID_OR_NOT_SUPPLIED',
+    FromAddressMissingOrInvalid = 'FROM_ADDRESS_MISSING_OR_INVALID',
 }
 export enum LedgerSubproviderErrors {
     TooOldLedgerFirmware = 'TOO_OLD_LEDGER_FIRMWARE',
-    FromAddressMissingOrInvalid = 'FROM_ADDRESS_MISSING_OR_INVALID',
     MultipleOpenConnectionsDisallowed = 'MULTIPLE_OPEN_CONNECTIONS_DISALLOWED',
 }
 
@@ -109,6 +118,12 @@ export enum NonceSubproviderErrors {
     EmptyParametersFound = 'EMPTY_PARAMETERS_FOUND',
     CannotDetermineAddressFromPayload = 'CANNOT_DETERMINE_ADDRESS_FROM_PAYLOAD',
 }
+export interface DerivedHDKeyInfo {
+    address: string;
+    baseDerivationPath: string;
+    derivationPath: string;
+    hdKey: HDNode;
+}
 
 export type ErrorCallback = (err: Error | null, data?: any) => void;
 export type Callback = () => void;
diff --git a/packages/subproviders/src/utils/wallet_utils.ts b/packages/subproviders/src/utils/wallet_utils.ts
new file mode 100644
index 000000000..cd5cd9ba0
--- /dev/null
+++ b/packages/subproviders/src/utils/wallet_utils.ts
@@ -0,0 +1,79 @@
+import ethUtil = require('ethereumjs-util');
+import HDNode = require('hdkey');
+import * as _ from 'lodash';
+
+import { DerivedHDKeyInfo, WalletSubproviderErrors } from '../types';
+
+const DEFAULT_ADDRESS_SEARCH_LIMIT = 1000;
+
+class DerivedHDKeyInfoIterator implements IterableIterator<DerivedHDKeyInfo> {
+    private _parentDerivedKeyInfo: DerivedHDKeyInfo;
+    private _searchLimit: number;
+    private _index: number;
+
+    constructor(initialDerivedKey: DerivedHDKeyInfo, searchLimit: number = DEFAULT_ADDRESS_SEARCH_LIMIT) {
+        this._searchLimit = searchLimit;
+        this._parentDerivedKeyInfo = initialDerivedKey;
+        this._index = 0;
+    }
+
+    public next(): IteratorResult<DerivedHDKeyInfo> {
+        const baseDerivationPath = this._parentDerivedKeyInfo.baseDerivationPath;
+        const derivationIndex = this._index;
+        const fullDerivationPath = `m/${baseDerivationPath}/${derivationIndex}`;
+        const path = `m/${derivationIndex}`;
+        const hdKey = this._parentDerivedKeyInfo.hdKey.derive(path);
+        const address = walletUtils.addressOfHDKey(hdKey);
+        const derivedKey: DerivedHDKeyInfo = {
+            address,
+            hdKey,
+            baseDerivationPath,
+            derivationPath: fullDerivationPath,
+        };
+        const done = this._index === this._searchLimit;
+        this._index++;
+        return {
+            done,
+            value: derivedKey,
+        };
+    }
+
+    public [Symbol.iterator](): IterableIterator<DerivedHDKeyInfo> {
+        return this;
+    }
+}
+
+export const walletUtils = {
+    calculateDerivedHDKeyInfos(parentDerivedKeyInfo: DerivedHDKeyInfo, numberOfKeys: number): DerivedHDKeyInfo[] {
+        const derivedKeys: DerivedHDKeyInfo[] = [];
+        const derivedKeyIterator = new DerivedHDKeyInfoIterator(parentDerivedKeyInfo, numberOfKeys);
+        for (const key of derivedKeyIterator) {
+            derivedKeys.push(key);
+        }
+        return derivedKeys;
+    },
+    findDerivedKeyInfoForAddressIfExists(
+        address: string,
+        parentDerivedKeyInfo: DerivedHDKeyInfo,
+        searchLimit: number,
+    ): DerivedHDKeyInfo | undefined {
+        let matchedKey: DerivedHDKeyInfo | undefined;
+        const derivedKeyIterator = new DerivedHDKeyInfoIterator(parentDerivedKeyInfo, searchLimit);
+        for (const key of derivedKeyIterator) {
+            if (key.address === address) {
+                matchedKey = key;
+                break;
+            }
+        }
+        return matchedKey;
+    },
+    addressOfHDKey(hdKey: HDNode): string {
+        const shouldSanitizePublicKey = true;
+        const derivedPublicKey = hdKey.publicKey;
+        const ethereumAddressUnprefixed = ethUtil
+            .publicToAddress(derivedPublicKey, shouldSanitizePublicKey)
+            .toString('hex');
+        const address = ethUtil.addHexPrefix(ethereumAddressUnprefixed).toLowerCase();
+        return address;
+    },
+};
diff --git a/packages/subproviders/test/integration/ledger_subprovider_test.ts b/packages/subproviders/test/integration/ledger_subprovider_test.ts
index 9e81dfac5..0d6e67bd1 100644
--- a/packages/subproviders/test/integration/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/integration/ledger_subprovider_test.ts
@@ -33,7 +33,7 @@ describe('LedgerSubprovider', () => {
         ledgerSubprovider = new LedgerSubprovider({
             networkId,
             ledgerEthereumClientFactoryAsync: ledgerEthereumNodeJsClientFactoryAsync,
-            derivationPath: fixtureData.TESTRPC_DERIVATION_PATH,
+            baseDerivationPath: fixtureData.TESTRPC_BASE_DERIVATION_PATH,
         });
     });
     describe('direct method calls', () => {
@@ -42,9 +42,10 @@ describe('LedgerSubprovider', () => {
             expect(accounts[0]).to.not.be.an('undefined');
             expect(accounts.length).to.be.equal(10);
         });
-        it('returns the expected first account from a ledger set up with the test mnemonic', async () => {
+        it('returns the expected accounts from a ledger set up with the test mnemonic', async () => {
             const accounts = await ledgerSubprovider.getAccountsAsync();
             expect(accounts[0]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_0);
+            expect(accounts[1]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_1);
         });
         it('returns requested number of accounts', async () => {
             const numberOfAccounts = 20;
@@ -54,14 +55,29 @@ describe('LedgerSubprovider', () => {
         });
         it('signs a personal message', async () => {
             const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
-            const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(data);
-            expect(ecSignatureHex.length).to.be.equal(132);
+            const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(
+                data,
+                fixtureData.TEST_RPC_ACCOUNT_0,
+            );
             expect(ecSignatureHex).to.be.equal(fixtureData.PERSONAL_MESSAGE_SIGNED_RESULT);
         });
+        it('signs a personal message with second address', async () => {
+            const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+            const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(
+                data,
+                fixtureData.TEST_RPC_ACCOUNT_1,
+            );
+            expect(ecSignatureHex).to.be.equal(fixtureData.PERSONAL_MESSAGE_ACCOUNT_1_SIGNED_RESULT);
+        });
         it('signs a transaction', async () => {
             const txHex = await ledgerSubprovider.signTransactionAsync(fixtureData.TX_DATA);
             expect(txHex).to.be.equal(fixtureData.TX_DATA_SIGNED_RESULT);
         });
+        it('signs a transaction with the second address', async () => {
+            const txData = { ...fixtureData.TX_DATA, from: fixtureData.TEST_RPC_ACCOUNT_1 };
+            const txHex = await ledgerSubprovider.signTransactionAsync(txData);
+            expect(txHex).to.be.equal(fixtureData.TX_DATA_ACCOUNT_1_SIGNED_RESULT);
+        });
     });
     describe('calls through a provider', () => {
         let defaultProvider: Web3ProviderEngine;
diff --git a/packages/subproviders/test/unit/ledger_subprovider_test.ts b/packages/subproviders/test/unit/ledger_subprovider_test.ts
index 88d38f59b..892c2acd0 100644
--- a/packages/subproviders/test/unit/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/unit/ledger_subprovider_test.ts
@@ -82,7 +82,7 @@ describe('LedgerSubprovider', () => {
             });
             it('signs a personal message', async () => {
                 const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
-                const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(data);
+                const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(data, FAKE_ADDRESS);
                 expect(ecSignatureHex).to.be.equal(
                     '0xa6cc284bff14b42bdf5e9286730c152be91719d478605ec46b3bebcd0ae491480652a1a7b742ceb0213d1e744316e285f41f878d8af0b8e632cbca4c279132d001',
                 );
@@ -94,7 +94,7 @@ describe('LedgerSubprovider', () => {
                 return expect(
                     Promise.all([
                         ledgerSubprovider.getAccountsAsync(),
-                        ledgerSubprovider.signPersonalMessageAsync(data),
+                        ledgerSubprovider.signPersonalMessageAsync(data, FAKE_ADDRESS),
                     ]),
                 ).to.be.rejectedWith(LedgerSubproviderErrors.MultipleOpenConnectionsDisallowed);
             });
@@ -129,7 +129,7 @@ describe('LedgerSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'eth_sign',
-                    params: ['0x0000000000000000000000000000000000000000', messageHex],
+                    params: [FAKE_ADDRESS, messageHex],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -146,7 +146,7 @@ describe('LedgerSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'personal_sign',
-                    params: [messageHex, '0x0000000000000000000000000000000000000000'],
+                    params: [messageHex, FAKE_ADDRESS],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -165,6 +165,7 @@ describe('LedgerSubprovider', () => {
                     gasPrice: '0x00',
                     nonce: '0x00',
                     gas: '0x00',
+                    from: FAKE_ADDRESS,
                 };
                 const payload = {
                     jsonrpc: '2.0',
@@ -187,7 +188,7 @@ describe('LedgerSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'eth_sign',
-                    params: ['0x0000000000000000000000000000000000000000', nonHexMessage],
+                    params: [FAKE_ADDRESS, nonHexMessage],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -202,7 +203,7 @@ describe('LedgerSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'personal_sign',
-                    params: [nonHexMessage, '0x0000000000000000000000000000000000000000'],
+                    params: [nonHexMessage, FAKE_ADDRESS],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
diff --git a/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts b/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts
new file mode 100644
index 000000000..93300f47d
--- /dev/null
+++ b/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts
@@ -0,0 +1,215 @@
+import { JSONRPCResponsePayload } from '@0xproject/types';
+import * as chai from 'chai';
+import * as ethUtils from 'ethereumjs-util';
+import * as _ from 'lodash';
+import Web3ProviderEngine = require('web3-provider-engine');
+
+import { GanacheSubprovider, MnemonicWalletSubprovider } from '../../src/';
+import {
+    DoneCallback,
+    LedgerCommunicationClient,
+    LedgerSubproviderErrors,
+    WalletSubproviderErrors,
+} from '../../src/types';
+import { chaiSetup } from '../chai_setup';
+import { fixtureData } from '../utils/fixture_data';
+import { reportCallbackErrors } from '../utils/report_callback_errors';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('MnemonicWalletSubprovider', () => {
+    let subprovider: MnemonicWalletSubprovider;
+    before(async () => {
+        subprovider = new MnemonicWalletSubprovider({
+            mnemonic: fixtureData.TEST_RPC_MNEMONIC,
+            baseDerivationPath: fixtureData.TEST_RPC_MNEMONIC_BASE_DERIVATION_PATH,
+        });
+    });
+    describe('direct method calls', () => {
+        describe('success cases', () => {
+            it('returns the accounts', async () => {
+                const accounts = await subprovider.getAccountsAsync();
+                expect(accounts[0]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_0);
+                expect(accounts[1]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_1);
+                expect(accounts.length).to.be.equal(10);
+            });
+            it('signs a personal message', async () => {
+                const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const ecSignatureHex = await subprovider.signPersonalMessageAsync(data, fixtureData.TEST_RPC_ACCOUNT_0);
+                expect(ecSignatureHex).to.be.equal(fixtureData.PERSONAL_MESSAGE_SIGNED_RESULT);
+            });
+            it('signs a personal message with second address', async () => {
+                const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const ecSignatureHex = await subprovider.signPersonalMessageAsync(data, fixtureData.TEST_RPC_ACCOUNT_1);
+                expect(ecSignatureHex).to.be.equal(fixtureData.PERSONAL_MESSAGE_ACCOUNT_1_SIGNED_RESULT);
+            });
+            it('signs a transaction', async () => {
+                const txHex = await subprovider.signTransactionAsync(fixtureData.TX_DATA);
+                expect(txHex).to.be.equal(fixtureData.TX_DATA_SIGNED_RESULT);
+            });
+            it('signs a transaction with the second address', async () => {
+                const txData = { ...fixtureData.TX_DATA, from: fixtureData.TEST_RPC_ACCOUNT_1 };
+                const txHex = await subprovider.signTransactionAsync(txData);
+                expect(txHex).to.be.equal(fixtureData.TX_DATA_ACCOUNT_1_SIGNED_RESULT);
+            });
+        });
+        describe('failure cases', () => {
+            it('throws an error if address is invalid ', async () => {
+                const txData = { ...fixtureData.TX_DATA, from: '0x0' };
+                return expect(subprovider.signTransactionAsync(txData)).to.be.rejectedWith(
+                    WalletSubproviderErrors.FromAddressMissingOrInvalid,
+                );
+            });
+            it('throws an error if address is valid format but not found', async () => {
+                const txData = { ...fixtureData.TX_DATA, from: fixtureData.NULL_ADDRESS };
+                return expect(subprovider.signTransactionAsync(txData)).to.be.rejectedWith(
+                    `${WalletSubproviderErrors.AddressNotFound}: ${fixtureData.NULL_ADDRESS}`,
+                );
+            });
+        });
+    });
+    describe('calls through a provider', () => {
+        let provider: Web3ProviderEngine;
+        before(() => {
+            provider = new Web3ProviderEngine();
+            provider.addProvider(subprovider);
+            const ganacheSubprovider = new GanacheSubprovider({});
+            provider.addProvider(ganacheSubprovider);
+            provider.start();
+        });
+        describe('success cases', () => {
+            it('returns a list of accounts', (done: DoneCallback) => {
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_accounts',
+                    params: [],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.be.a('null');
+                    expect(response.result[0]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_0);
+                    expect(response.result.length).to.be.equal(10);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('signs a personal message with eth_sign', (done: DoneCallback) => {
+                const messageHex = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_sign',
+                    params: [fixtureData.TEST_RPC_ACCOUNT_0, messageHex],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.be.a('null');
+                    expect(response.result).to.be.equal(fixtureData.PERSONAL_MESSAGE_SIGNED_RESULT);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('signs a personal message with personal_sign', (done: DoneCallback) => {
+                const messageHex = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'personal_sign',
+                    params: [messageHex, fixtureData.TEST_RPC_ACCOUNT_0],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.be.a('null');
+                    expect(response.result).to.be.equal(fixtureData.PERSONAL_MESSAGE_SIGNED_RESULT);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+        });
+        describe('failure cases', () => {
+            it('should throw if `data` param not hex when calling eth_sign', (done: DoneCallback) => {
+                const nonHexMessage = 'hello world';
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_sign',
+                    params: [fixtureData.TEST_RPC_ACCOUNT_0, nonHexMessage],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal('Expected data to be of type HexString, encountered: hello world');
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('should throw if `data` param not hex when calling personal_sign', (done: DoneCallback) => {
+                const nonHexMessage = 'hello world';
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'personal_sign',
+                    params: [nonHexMessage, fixtureData.TEST_RPC_ACCOUNT_0],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal('Expected data to be of type HexString, encountered: hello world');
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('should throw if `address` param not found when calling personal_sign', (done: DoneCallback) => {
+                const messageHex = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'personal_sign',
+                    params: [messageHex, fixtureData.NULL_ADDRESS],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal(
+                        `${WalletSubproviderErrors.AddressNotFound}: ${fixtureData.NULL_ADDRESS}`,
+                    );
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('should throw if `from` param missing when calling eth_sendTransaction', (done: DoneCallback) => {
+                const tx = {
+                    to: '0xafa3f8684e54059998bc3a7b0d2b0da075154d66',
+                    value: '0xde0b6b3a7640000',
+                };
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_sendTransaction',
+                    params: [tx],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal(WalletSubproviderErrors.SenderInvalidOrNotSupplied);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('should throw if `from` param invalid address when calling eth_sendTransaction', (done: DoneCallback) => {
+                const tx = {
+                    to: '0xafa3f8684e54059998bc3a7b0d2b0da075154d66',
+                    from: '0xIncorrectEthereumAddress',
+                    value: '0xde0b6b3a7640000',
+                };
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_sendTransaction',
+                    params: [tx],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal(WalletSubproviderErrors.SenderInvalidOrNotSupplied);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+        });
+    });
+});
diff --git a/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts b/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts
index ca0665871..5c1b5cd25 100644
--- a/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts
+++ b/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts
@@ -32,7 +32,7 @@ describe('PrivateKeyWalletSubprovider', () => {
             });
             it('signs a personal message', async () => {
                 const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
-                const ecSignatureHex = await subprovider.signPersonalMessageAsync(data);
+                const ecSignatureHex = await subprovider.signPersonalMessageAsync(data, fixtureData.TEST_RPC_ACCOUNT_0);
                 expect(ecSignatureHex).to.be.equal(fixtureData.PERSONAL_MESSAGE_SIGNED_RESULT);
             });
             it('signs a transaction', async () => {
@@ -71,7 +71,7 @@ describe('PrivateKeyWalletSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'eth_sign',
-                    params: ['0x0000000000000000000000000000000000000000', messageHex],
+                    params: [fixtureData.TEST_RPC_ACCOUNT_0, messageHex],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -86,7 +86,7 @@ describe('PrivateKeyWalletSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'personal_sign',
-                    params: [messageHex, '0x0000000000000000000000000000000000000000'],
+                    params: [messageHex, fixtureData.TEST_RPC_ACCOUNT_0],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -103,7 +103,7 @@ describe('PrivateKeyWalletSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'eth_sign',
-                    params: ['0x0000000000000000000000000000000000000000', nonHexMessage],
+                    params: [fixtureData.TEST_RPC_ACCOUNT_0, nonHexMessage],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -118,7 +118,7 @@ describe('PrivateKeyWalletSubprovider', () => {
                 const payload = {
                     jsonrpc: '2.0',
                     method: 'personal_sign',
-                    params: [nonHexMessage, '0x0000000000000000000000000000000000000000'],
+                    params: [nonHexMessage, fixtureData.TEST_RPC_ACCOUNT_0],
                     id: 1,
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
@@ -128,6 +128,25 @@ describe('PrivateKeyWalletSubprovider', () => {
                 });
                 provider.sendAsync(payload, callback);
             });
+            it('should throw if `address` param is not the address from private key when calling personal_sign', (done: DoneCallback) => {
+                const messageHex = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'personal_sign',
+                    params: [messageHex, fixtureData.TEST_RPC_ACCOUNT_1],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal(
+                        `Requested to sign message with address: ${
+                            fixtureData.TEST_RPC_ACCOUNT_1
+                        }, instantiated with address: ${fixtureData.TEST_RPC_ACCOUNT_0}`,
+                    );
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
             it('should throw if `from` param missing when calling eth_sendTransaction', (done: DoneCallback) => {
                 const tx = {
                     to: '0xafa3f8684e54059998bc3a7b0d2b0da075154d66',
@@ -165,6 +184,21 @@ describe('PrivateKeyWalletSubprovider', () => {
                 });
                 provider.sendAsync(payload, callback);
             });
+            it('should throw if `address` param not found when calling personal_sign', (done: DoneCallback) => {
+                const messageHex = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'personal_sign',
+                    params: [messageHex, '0x0'],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal(`Expected address to be of type ETHAddressHex, encountered: 0x0`);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
         });
     });
 });
diff --git a/packages/subproviders/test/utils/fixture_data.ts b/packages/subproviders/test/utils/fixture_data.ts
index 890573d0d..3137e08b0 100644
--- a/packages/subproviders/test/utils/fixture_data.ts
+++ b/packages/subproviders/test/utils/fixture_data.ts
@@ -1,18 +1,26 @@
 const TEST_RPC_ACCOUNT_0 = '0x5409ed021d9299bf6814279a6a1411a7e866a631';
+const TEST_RPC_ACCOUNT_1 = '0x6ecbe1db9ef729cbe972c83fb886247691fb6beb';
+const NULL_ADDRESS = '0x0000000000000000000000000000000000000000';
 const networkId = 42;
 export const fixtureData = {
+    NULL_ADDRESS,
     TEST_RPC_ACCOUNT_0,
     TEST_RPC_ACCOUNT_0_ACCOUNT_PRIVATE_KEY: 'F2F48EE19680706196E2E339E5DA3491186E0C4C5030670656B0E0164837257D',
+    TEST_RPC_ACCOUNT_1,
+    TEST_RPC_MNEMONIC: 'concert load couple harbor equip island argue ramp clarify fence smart topic',
+    TEST_RPC_MNEMONIC_BASE_DERIVATION_PATH: `44'/60'/0'/0`,
     PERSONAL_MESSAGE_STRING: 'hello world',
     PERSONAL_MESSAGE_SIGNED_RESULT:
         '0x1b0ec5e2908e993d0c8ab6b46da46be2688fdf03c7ea6686075de37392e50a7d7fcc531446699132fbda915bd989882e0064d417018773a315fb8d43ed063c9b00',
-    TESTRPC_DERIVATION_PATH: `m/44'/60'/0'/0`,
+    PERSONAL_MESSAGE_ACCOUNT_1_SIGNED_RESULT:
+        '0xe7ae0c21d02eb38f2c2a20d9d7876a98cc7ef035b7a4559d49375e2ec735e06f0d0ab0ff92ee56c5ffc28d516e6ed0692d0270feae8796408dbef060c6c7100f01',
+    TESTRPC_BASE_DERIVATION_PATH: `m/44'/60'/0'/0`,
     NETWORK_ID: networkId,
     TX_DATA: {
         nonce: '0x00',
         gasPrice: '0x0',
         gas: '0x2710',
-        to: '0x0000000000000000000000000000000000000000',
+        to: NULL_ADDRESS,
         value: '0x00',
         chainId: networkId,
         from: TEST_RPC_ACCOUNT_0,
@@ -20,4 +28,6 @@ export const fixtureData = {
     // This is the signed result of the abouve Transaction Data
     TX_DATA_SIGNED_RESULT:
         '0xf85f8080822710940000000000000000000000000000000000000000808078a0712854c73c69445cc1b22a7c3d7312ff9a97fe4ffba35fd636e8236b211b6e7ca0647cee031615e52d916c7c707025bc64ad525d8f1b9876c3435a863b42743178',
+    TX_DATA_ACCOUNT_1_SIGNED_RESULT:
+        '0xf85f8080822710940000000000000000000000000000000000000000808078a04b02af7ff3f18ce114b601542cc8ebdc50921354f75dd510d31793453a0710e6a0540082a01e475465801b8186a2edc79ec1a2dcf169b9781c25a58a417023c9ca',
 };
diff --git a/packages/subproviders/tsconfig.json b/packages/subproviders/tsconfig.json
index e35816553..72dfee80b 100644
--- a/packages/subproviders/tsconfig.json
+++ b/packages/subproviders/tsconfig.json
@@ -1,7 +1,8 @@
 {
     "extends": "../../tsconfig",
     "compilerOptions": {
-        "outDir": "lib"
+        "outDir": "lib",
+        "downlevelIteration": true
     },
     "include": ["./src/**/*", "./test/**/*"]
 }
diff --git a/packages/typescript-typings/CHANGELOG.json b/packages/typescript-typings/CHANGELOG.json
index 39af8ace0..2ea5ff0ec 100644
--- a/packages/typescript-typings/CHANGELOG.json
+++ b/packages/typescript-typings/CHANGELOG.json
@@ -5,6 +5,10 @@
             {
                 "note": "Add types for more packages",
                 "pr": 501
+            },
+            {
+                "note": "Add types for HDKey",
+                "pr": 507
             }
         ],
         "timestamp": 1523462196
diff --git a/packages/typescript-typings/types/hdkey/index.d.ts b/packages/typescript-typings/types/hdkey/index.d.ts
new file mode 100644
index 000000000..84b751bd7
--- /dev/null
+++ b/packages/typescript-typings/types/hdkey/index.d.ts
@@ -0,0 +1,11 @@
+declare module 'hdkey' {
+    class HDNode {
+        public static fromMasterSeed(seed: Buffer): HDNode;
+        public publicKey: Buffer;
+        public privateKey: Buffer;
+        public chainCode: Buffer;
+        public constructor();
+        public derive(path: string): HDNode;
+    }
+    export = HDNode;
+}
diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index 7d79542a3..99e4856ce 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -78,7 +78,7 @@ export class Blockchain {
     private _userAddressIfExists: string;
     private _cachedProvider: Provider;
     private _cachedProviderNetworkId: number;
-    private _ledgerSubprovider: LedgerWalletSubprovider;
+    private _ledgerSubprovider: LedgerSubprovider;
     private _defaultGasPrice: BigNumber;
     private static _getNameGivenProvider(provider: Provider): string {
         const providerType = utils.getProviderType(provider);
@@ -180,12 +180,6 @@ export class Blockchain {
         }
         this._ledgerSubprovider.setPath(path);
     }
-    public updateLedgerDerivationIndex(pathIndex: number) {
-        if (_.isUndefined(this._ledgerSubprovider)) {
-            return; // noop
-        }
-        this._ledgerSubprovider.setPathIndex(pathIndex);
-    }
     public async updateProviderToLedgerAsync(networkId: number) {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
 
diff --git a/packages/website/ts/components/dialogs/ledger_config_dialog.tsx b/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
index d7190c0bb..a72d33183 100644
--- a/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
+++ b/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
@@ -199,7 +199,6 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
     }
     private _onAddressSelected(selectedRowIndexes: number[]) {
         const selectedRowIndex = selectedRowIndexes[0];
-        this.props.blockchain.updateLedgerDerivationIndex(selectedRowIndex);
         const selectedAddress = this.state.userAddresses[selectedRowIndex];
         const selectAddressBalance = this.state.addressBalances[selectedRowIndex];
         this.props.dispatcher.updateUserAddress(selectedAddress);
diff --git a/packages/website/ts/containers/subproviders_documentation.ts b/packages/website/ts/containers/subproviders_documentation.ts
index 4a956acea..017d708a4 100644
--- a/packages/website/ts/containers/subproviders_documentation.ts
+++ b/packages/website/ts/containers/subproviders_documentation.ts
@@ -30,6 +30,8 @@ const docSections = {
     redundantRPCSubprovider: 'redundantRPCSubprovider',
     ganacheSubprovider: 'ganacheSubprovider',
     nonceTrackerSubprovider: 'nonceTrackerSubprovider',
+    privateKeyWalletSubprovider: 'privateKeyWalletSubprovider',
+    mnemonicWalletSubprovider: 'mnemonicWalletSubprovider',
     types: docConstants.TYPES_SECTION_NAME,
 };
 
@@ -44,6 +46,8 @@ const docsInfoConfig: DocsInfoConfig = {
         subprovider: [docSections.subprovider],
         ['ledger-subprovider']: [docSections.ledgerSubprovider],
         ['ledger-node-hid-issue']: [docSections.ledgerNodeHid],
+        ['private-key-wallet-subprovider']: [docSections.privateKeyWalletSubprovider],
+        ['mnemonic-wallet-subprovider']: [docSections.mnemonicWalletSubprovider],
         ['factory-methods']: [docSections.factoryMethods],
         ['emptyWallet-subprovider']: [docSections.emptyWalletSubprovider],
         ['fakeGasEstimate-subprovider']: [docSections.fakeGasEstimateSubprovider],
@@ -61,6 +65,8 @@ const docsInfoConfig: DocsInfoConfig = {
     sectionNameToModulePath: {
         [docSections.subprovider]: ['"subproviders/src/subproviders/subprovider"'],
         [docSections.ledgerSubprovider]: ['"subproviders/src/subproviders/ledger"'],
+        [docSections.privateKeyWalletSubprovider]: ['"subproviders/src/subproviders/private_key_wallet"'],
+        [docSections.mnemonicWalletSubprovider]: ['"subproviders/src/subproviders/mnemonic_wallet"'],
         [docSections.factoryMethods]: ['"subproviders/src/index"'],
         [docSections.emptyWalletSubprovider]: ['"subproviders/src/subproviders/empty_wallet_subprovider"'],
         [docSections.fakeGasEstimateSubprovider]: ['"subproviders/src/subproviders/fake_gas_estimate_subprovider"'],
@@ -75,6 +81,8 @@ const docsInfoConfig: DocsInfoConfig = {
     visibleConstructors: [
         docSections.subprovider,
         docSections.ledgerSubprovider,
+        docSections.privateKeyWalletSubprovider,
+        docSections.mnemonicWalletSubprovider,
         docSections.emptyWalletSubprovider,
         docSections.fakeGasEstimateSubprovider,
         docSections.injectedWeb3Subprovider,
@@ -98,6 +106,7 @@ const docsInfoConfig: DocsInfoConfig = {
             'PartialTxParams',
             'LedgerEthereumClient',
             'LedgerSubproviderConfigs',
+            'MnemonicWalletSubproviderConfigs',
             'OnNextCompleted',
             'Provider',
         ],