From 0ebe1f0be697d4d2879f408c230744a1a58ad6aa Mon Sep 17 00:00:00 2001
From: Chad Engler <englercj@live.com>
Date: Wed, 27 May 2015 08:29:18 -0700
Subject: [PATCH] add fallback to browser is secp256k1

---
 browser.js | 4 ++--
 index.js   | 9 ++++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/browser.js b/browser.js
index 045d523..e223c63 100644
--- a/browser.js
+++ b/browser.js
@@ -7,7 +7,7 @@
 var EC = require("elliptic").ec;
 
 var ec = new EC("secp256k1");
-var cryptoObj = window.crypto || window.msCrypto || {};
+var cryptoObj = global.crypto || global.msCrypto || {};
 var subtle = cryptoObj.subtle || cryptoObj.webkitSubtle;
 
 function assert(condition, message) {
@@ -18,7 +18,7 @@ function assert(condition, message) {
 
 function randomBytes(size) {
   var arr = new Uint8Array(size);
-  window.crypto.getRandomValues(arr);
+  global.crypto.getRandomValues(arr);
   return new Buffer(arr);
 }
 
diff --git a/index.js b/index.js
index fa0f728..e9f1a4d 100644
--- a/index.js
+++ b/index.js
@@ -9,9 +9,12 @@ var promise = typeof Promise === "undefined" ?
               require("es6-promise").Promise :
               Promise;
 var crypto = require("crypto");
-// TODO(Kagami): We may fallback to pure JS implementation
-// (`browser.js`) if this modules are failed to load.
-var secp256k1 = require("secp256k1");
+// try to use secp256k1, fallback to browser implementation
+try {
+  var secp256k1 = require("secp256k1");
+} catch (e) {
+  return module.exports = require("./browser");
+}
 var ecdh = require("./build/Release/ecdh");
 
 function assert(condition, message) {