From 4e34d3d0cabf352eae06b77784327600736821bc Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Fri, 12 Feb 2016 15:41:48 -0800
Subject: [PATCH] use native pbkdf2.

---
 lib/bcoin/hd.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/bcoin/hd.js b/lib/bcoin/hd.js
index f32385d1..0e6296cd 100644
--- a/lib/bcoin/hd.js
+++ b/lib/bcoin/hd.js
@@ -1123,12 +1123,16 @@ function array32(data) {
 /**
  * PDKBF2
  * Credit to: https://github.com/stayradiated/pbkdf2-sha512
- * Copyright (c) 2014, JP Richardson Copyright (c) 2010-2011 Intalio Pte, All Rights Reserved
+ * Copyright (c) 2010-2011 Intalio Pte, All Rights Reserved
+ * Copyright (c) 2014, JP Richardson
  */
 
 function pbkdf2(key, salt, iterations, dkLen) {
   'use strict';
 
+  if (bcoin.crypto && bcoin.crypto.pbkdf2Sync)
+    return bcoin.crypto.pbkdf2Sync(key, salt, iterations, dkLen, 'sha512');
+
   var hLen = 64;
 
   if (dkLen > (Math.pow(2, 32) - 1) * hLen)
@@ -1191,7 +1195,7 @@ var cache = {
 cache.set = function(key, index, value) {
   key = key + '/' + index;
 
-  if (this.count > 200) {
+  if (this.count > 500) {
     this.data = {};
     this.count = 0;
   }