From 5ab9f6849aed10ccbbcafaab38c35722c7994000 Mon Sep 17 00:00:00 2001
From: Maximilian Herkender <static@brokenfunction.com>
Date: Sun, 1 Apr 2012 15:03:34 -0700
Subject: [PATCH] write zeros in one call

---
 sha1.as | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/sha1.as b/sha1.as
index b01eedc..34465e8 100644
--- a/sha1.as
+++ b/sha1.as
@@ -12,17 +12,9 @@ package {
 
     // sha-1 adds a 64-bit integer that has the size
     // BUT enough zeros need to be added so that they'll be at the end of a chunk
-    var i:int = Math.ceil((originalLength + 9) / 64) * 64 - originalLength - 9;
-    for (; i >= 4; i -= 4) {
-      byteInput.writeInt(0x0);
-    }
-    if (i >= 2) {
-      byteInput.writeShort(0x0);
-      if (i === 3) {
-        byteInput.writeByte(0x0);
-      }
-    } else if (i === 1) {
-      byteInput.writeByte(0x0);
+    const newLen:uint = Math.ceil((originalLength + 9) / 64) * 64 - originalLength - 9;
+    if (newLen) {
+      byteInput.writeBytes(zeroByteArray, 0, newLen);
     }
 
     // append the original size of the input
@@ -52,8 +44,9 @@ package {
     var w13:int;
     var w14:int;
     var w15:int;
-    
-    for (i = byteInput.length >>> 6, byteInput.position = 0; i > 0; --i) {
+
+    byteInput.position = 0;
+    for (var i:int = byteInput.length >>> 6; i > 0; --i) {
       // set up variables for this chunk
       var a:int = h0;
       var b:int = h1;
@@ -150,7 +143,7 @@ package {
       h4 += e;
     }
     
-    byteInput.length = 0;// cleanup
+    byteInput.length = 0;
 
     var result:String = uint(h4).toString(16);
     var zeros:Array = staticZeros;
@@ -180,3 +173,6 @@ const staticByteArray:ByteArray = new ByteArray();
 staticByteArray.endian = "bigEndian";
 
 const staticZeros:Array = ["", "0", "00", "000", "0000", "00000", "000000", "0000000"];
+
+const zeroByteArray:ByteArray = new ByteArray();
+zeroByteArray.length = 64; // enough zeros to fill one chunk