From 06e8afb418e4cb40ac087d69b808f4eeca80cbde Mon Sep 17 00:00:00 2001
From: Jim Wigginton <terrafrost@php.net>
Date: Sat, 19 Mar 2011 03:32:22 +0000
Subject: [PATCH] - fixed a bug that could prevent _emsa_pss_verify from
 working in rare circumstances (thanks Lesque!)

git-svn-id: http://phpseclib.svn.sourceforge.net/svnroot/phpseclib/trunk@148 21d32557-59b3-4da0-833f-c5933fad653e
---
 phpseclib/Crypt/RSA.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/phpseclib/Crypt/RSA.php b/phpseclib/Crypt/RSA.php
index 9512ee65..8a4b76cf 100644
--- a/phpseclib/Crypt/RSA.php
+++ b/phpseclib/Crypt/RSA.php
@@ -1776,8 +1776,8 @@ class Crypt_RSA {
             return false;
         }
 
-        $maskedDB = substr($em, 0, $em - $this->hLen - 1);
-        $h = substr($em, $em - $this->hLen - 1, $this->hLen);
+        $maskedDB = substr($em, 0, -$this->hLen - 1);
+        $h = substr($em, -$this->hLen - 1, $this->hLen);
         $temp = chr(0xFF << ($emBits & 7));
         if ((~$maskedDB[0] & $temp) != $temp) {
             return false;