diff --git a/client.js b/client.js
index 417de8a..ce94acf 100644
--- a/client.js
+++ b/client.js
@@ -3,7 +3,7 @@
 const https = require('https')
 
 const info = require('./package')
-const auth = require('./auth')
+const util = require('./util')
 
 exports.request = (options, env = process.env, { request } = https, { hostnameFor, headersFor, toString } = exports) => {
   return new Promise((resolve, reject) => {
@@ -35,7 +35,7 @@ exports.hostnameFor = ({ npm_config_coinbase_pro_api_hostname, npm_config_coinba
     : coinbase_pro_api_hostname
 }
 
-exports.headersFor = (options, { npm_config_coinbase_pro_api_key = String.prototype, npm_config_coinbase_pro_api_passphrase = String.prototype, npm_config_coinbase_pro_api_secret = String.prototype } = process.env, { signatureFor } = auth, { name, version } = info) => {
+exports.headersFor = (options, { npm_config_coinbase_pro_api_key = String.prototype, npm_config_coinbase_pro_api_passphrase = String.prototype, npm_config_coinbase_pro_api_secret = String.prototype } = process.env, { signatureFor } = util, { name, version } = info) => {
   const timestamp = 1e-3 * Date.now() // fixme: not sure if timestamp should be created here
   return {
     'User-Agent': name + '/' + version,
diff --git a/package.json b/package.json
index 733b85c..3f57d7e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "coinbase-pro-api",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "lightweight coinbase pro api implementation",
   "main": "index.js",
   "config": {
diff --git a/test/auth.js b/test/util.js
similarity index 95%
rename from test/auth.js
rename to test/util.js
index 3632a10..6717f7d 100644
--- a/test/auth.js
+++ b/test/util.js
@@ -1,8 +1,8 @@
-test('coinbase-pro-api/auth', () => {
+test('coinbase-pro-api/util', () => {
   const { ok, strictEqual, deepStrictEqual } = require('assert')
 
   test('.configurationFor', () => {
-    const { configurationFor } = require('../auth')
+    const { configurationFor } = require('../util')
 
     test('is callable', () => {
       deepStrictEqual(typeof configurationFor, 'function')
@@ -37,7 +37,7 @@ test('coinbase-pro-api/auth', () => {
   })
 
   test('.signatureFor', () => {
-    const { signatureFor } = require('../auth')
+    const { signatureFor } = require('../util')
 
     test('is callable', () => {
       deepStrictEqual(typeof signatureFor, 'function')
diff --git a/auth.js b/util.js
similarity index 100%
rename from auth.js
rename to util.js
index e49f933..8a2c061 100644
--- a/auth.js
+++ b/util.js
@@ -2,6 +2,13 @@
 
 const crypto = require('crypto')
 
+exports.signatureFor = ({ timestamp, method, path = String.prototype, body = String.prototype }, { npm_config_coinbase_pro_api_secret = String.prototype } = process.env, { createHmac } = crypto) => {
+  const buffer = Buffer.from(npm_config_coinbase_pro_api_secret, 'base64')
+  return createHmac('sha256', buffer)
+    .update(timestamp + method.toUpperCase() + path + body)
+    .digest('base64')
+}
+
 exports.configurationFor = ({ sandbox, hostname, key, passphrase, secret } = Object.prototype) => {
   return {
     npm_config_coinbase_pro_api_sandbox: String(sandbox),
@@ -11,10 +18,3 @@ exports.configurationFor = ({ sandbox, hostname, key, passphrase, secret } = Obj
     npm_config_coinbase_pro_api_secret: secret
   }
 }
-
-exports.signatureFor = ({ timestamp, method, path = String.prototype, body = String.prototype }, { npm_config_coinbase_pro_api_secret = String.prototype } = process.env, { createHmac } = crypto) => {
-  const buffer = Buffer.from(npm_config_coinbase_pro_api_secret, 'base64')
-  return createHmac('sha256', buffer)
-    .update(timestamp + method.toUpperCase() + path + body)
-    .digest('base64')
-}