From 1cb41fdaba3c51c40674233e6d9c0c4371803c59 Mon Sep 17 00:00:00 2001
From: Andreas Brekken <a@abrkn.com>
Date: Sat, 11 Jan 2014 16:31:09 +0700
Subject: [PATCH] Add BIP32_PRIME constant, 0x80000000

---
 src/bip32.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bip32.js b/src/bip32.js
index 998fc1a..6d58de2 100644
--- a/src/bip32.js
+++ b/src/bip32.js
@@ -29,6 +29,7 @@ var BIP32key = function(opts) {
 
 var PRIVDERIV = BIP32key.PRIVDERIV = '\x04\x88\xAD\xE4'
 var PUBDERIV = BIP32key.PUBDERIV = '\x04\x88\xB2\x1E'
+var BIP32_PRIME = BIP32key.PRIME = 0x80000000
 
 BIP32key.deserialize = function(str) {
     var bytes = base58.decode(str)
@@ -104,7 +105,7 @@ BIP32key.prototype.ckd = function(i) {
     }
     else pub = this.key.export('bytes')
 
-    if (i >= 2147483648) {
+    if (i >= BIP32_PRIME) {
         if (!priv) throw new Error("Can't do private derivation on public key!")
         blob = [0].concat(priv.slice(0,32),util.numToBytes(i,4).reverse())
     }