From a7ebe7d39de120451ebe3ddbadf3a5268a24a70e Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Thu, 5 Oct 2017 05:36:36 -0500
Subject: [PATCH] BigInteger: fix bitwise_not for 0

---
 phpseclib/Math/BigInteger.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 54bff85c..6f9d5915 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -2945,7 +2945,7 @@ class Math_BigInteger
         // (will always result in a smaller number.  ie. ~1 isn't 1111 1110 - it's 0)
         $temp = $this->toBytes();
         if ($temp == '') {
-            return '';
+            return $this->_normalize(new Math_BigInteger());
         }
         $pre_msb = decbin(ord($temp[0]));
         $temp = ~$temp;