From 55afeb3eaf56068edef1d7883a6c045ea0551174 Mon Sep 17 00:00:00 2001
From: Braydon Fuller <braydon@bitpay.com>
Date: Wed, 8 Jul 2015 22:15:20 -0400
Subject: [PATCH] Use Node.js crypto ripemd160 hash if available.

---
 lib/crypto/hash.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/crypto/hash.js b/lib/crypto/hash.js
index 0661a46..f6a625a 100644
--- a/lib/crypto/hash.js
+++ b/lib/crypto/hash.js
@@ -29,10 +29,19 @@ Hash.sha256sha256 = function(buf) {
 
 Hash.ripemd160 = function(buf) {
   $.checkArgument(BufferUtil.isBuffer(buf));
-  var hash = (new hashjs.ripemd160()).update(buf).digest();
-  return new Buffer(hash);
+  return crypto.createHash('ripemd160').update(buf).digest();
 };
 
+// Node.js crypto ripemd160 hashes are not supported in a browser
+// We'll replace with a (slower) version that does.
+if (global.window) {
+  Hash.ripemd160 = function(buf) {
+    $.checkArgument(BufferUtil.isBuffer(buf));
+    var hash = (new hashjs.ripemd160()).update(buf).digest();
+    return new Buffer(hash);
+  };
+}
+
 Hash.sha256ripemd160 = function(buf) {
   $.checkArgument(BufferUtil.isBuffer(buf));
   return Hash.ripemd160(Hash.sha256(buf));