From db6d2b5ec48bc1ff22294196d670fdcff3c1d2ce Mon Sep 17 00:00:00 2001
From: woodong <woodongwong@gmail.com>
Date: Mon, 17 Aug 2020 10:52:27 +0800
Subject: [PATCH] Update XOREncryption.php

---
 PHP/XOREncryption.php | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/PHP/XOREncryption.php b/PHP/XOREncryption.php
index 6946b73..c98286f 100644
--- a/PHP/XOREncryption.php
+++ b/PHP/XOREncryption.php
@@ -1,13 +1,18 @@
 <?php
 
 function encryptDecrypt($input) {
-    $key = ['K', 'C', 'Q']; //Can be any chars, and any size array
-    $output = '';
+    $key = 'KCQ';
+    $inputLen = strlen($input);
+    $keyLen = strlen($key);
 
-    for ($i = 0; $i < strlen($input); $i++) {
-        $output .= $input[$i] ^ $key[$i % count($key)];
+    if ($inputLen <= $keyLen) {
+        return $input ^ $key;
     }
-    return $output;
+
+    for ($i = 0; $i < $inputLen; ++$i) {
+        $input[$i] = $input[$i] ^ $key[$i % $keyLen];
+    }
+    return $input;
 }
 
 $encrypted = encryptDecrypt('kylewbanks.com');
@@ -15,4 +20,3 @@ echo "Encrypted:" . $encrypted . "\n";
 
 $decrypted = encryptDecrypt($encrypted);
 echo "Decrypted:" . $decrypted . "\n";
-