From f50f17122317c7e687d7ff267f1c2b10a2f131b9 Mon Sep 17 00:00:00 2001
From: ricmoo <me@ricmoo.com>
Date: Thu, 21 Jul 2016 17:07:40 -0400
Subject: [PATCH] Reuse existing functions.

---
 lib/signing-key.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/signing-key.js b/lib/signing-key.js
index 99b623879..9b5924917 100644
--- a/lib/signing-key.js
+++ b/lib/signing-key.js
@@ -100,8 +100,8 @@ var ibanChecksum = (function() {
 function SigningKey(privateKey) {
     if (!(this instanceof SigningKey)) { throw new Error('missing new'); }
 
-    if (typeof(privateKey) === 'string' && privateKey.match(/^0x[0-9A-Fa-f]{64}$/)) {
-        privateKey = new Buffer(privateKey.substring(2), 'hex');
+    if (utils.isHexString(privateKey, 32)) {
+        privateKey = utils.hexOrBuffer(privateKey);
     } else if (!Buffer.isBuffer(privateKey) || privateKey.length !== 32) {
         throw new Error('invalid private key');
     }