From 052e5bd1bef9bc5eef3fdd3c8466c1d83b7a2165 Mon Sep 17 00:00:00 2001
From: Daniele Cruciani <daniele@smartango.com>
Date: Tue, 17 Nov 2015 13:44:42 +0100
Subject: [PATCH] adding an extra block if block size in padding

PKCS padding specify to add an extra block (otherwise when decrypting the removed extra (-$padding) is randomly given from the ascii code of the last character)
---
 security.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/security.php b/security.php
index c2f266a..07b87db 100644
--- a/security.php
+++ b/security.php
@@ -15,6 +15,10 @@ public static function encrypt($input, $key) {
 
 	private static function pkcs5_pad ($text, $blocksize) { 
 		$pad = $blocksize - (strlen($text) % $blocksize); 
+		if($pad == 0) {
+			// if text size is multiple of blocksize, then is added an extra block
+			$pad = $blocksize;
+		}
 		return $text . str_repeat(chr($pad), $pad); 
 	}