From 83587f7b6e880b5e267d12a2defe8d360442d9bc Mon Sep 17 00:00:00 2001
From: Michael Dowling <mtdowling@gmail.com>
Date: Mon, 24 Nov 2014 10:37:57 -0800
Subject: [PATCH] Fixing signature v4 memory consumption. Closes #411

---
 src/Aws/Common/Signature/SignatureV4.php | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/src/Aws/Common/Signature/SignatureV4.php b/src/Aws/Common/Signature/SignatureV4.php
index 38b60b4594..9a9d900a11 100644
--- a/src/Aws/Common/Signature/SignatureV4.php
+++ b/src/Aws/Common/Signature/SignatureV4.php
@@ -24,6 +24,7 @@
 use Guzzle\Http\Message\RequestInterface;
 use Guzzle\Http\QueryString;
 use Guzzle\Http\Url;
+use Guzzle\Stream\Stream;
 
 /**
  * Signature Version 4
@@ -230,12 +231,9 @@ protected function getPayload(RequestInterface $request)
         }
 
         if ($request instanceof EntityEnclosingRequestInterface) {
-            return hash(
-                'sha256',
-                $request->getMethod() == 'POST' && count($request->getPostFields())
-                    ? (string) $request->getPostFields()
-                    : (string) $request->getBody()
-            );
+            return $request->getMethod() == 'POST' && count($request->getPostFields())
+                ? hash('sha256', (string) $request->getPostFields())
+                : Stream::getHash($request->getBody(), 'sha256');
         }
 
         return self::DEFAULT_PAYLOAD;