From 19fb4637219b908673d8fe863ed660217d2b04c3 Mon Sep 17 00:00:00 2001
From: Joe Lencioni <joe.lencioni@airbnb.com>
Date: Thu, 5 Jul 2018 04:45:48 -0700
Subject: [PATCH] Use MD4 instead of SHA1 for filename hashes

We don't need the cryptographic strength of SHA-1 for this purpose, so
we may as well use a faster hashing algorithm.

While I was at it, I also sapped out the use of hash.end + hash.read
combo for the faster and more conventional hash.update + hash.digest. In
my local testing, this also seems to offer a nice speed boost.
---
 src/fs-cache.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/fs-cache.js b/src/fs-cache.js
index 07c66a1a..1894af73 100644
--- a/src/fs-cache.js
+++ b/src/fs-cache.js
@@ -71,16 +71,16 @@ const write = function(filename, result, callback) {
  * @return {String}
  */
 const filename = function(source, identifier, options) {
-  const hash = crypto.createHash("SHA1");
+  const hash = crypto.createHash("md4");
   const contents = JSON.stringify({
     source: source,
     options: options,
     identifier: identifier,
   });
 
-  hash.end(contents);
+  hash.update(contents);
 
-  return hash.read().toString("hex") + ".json.gz";
+  return hash.digest("hex") + ".json.gz";
 };
 
 /**