Added missing Captcha file

diff --git a/CaptchaSecurityImages.php b/CaptchaSecurityImages.php
new file mode 100644 (file)
index 0000000..6763025
--- /dev/null
+++ b/CaptchaSecurityImages.php
@@ -0,0 +1,90 @@
+<?php
+session_start();
+if (isset($_REQUEST['_SESSION'])) die("_SESSION INJECT prevention");
+if (ini_get('register_globals'))
+{
+        foreach ($_SESSION as $key=>$value)
+        {
+            if (isset($GLOBALS[$key]))
+                unset($GLOBALS[$key]);
+        }
+}
+
+/*
+* File: CaptchaSecurityImages.php
+* Author: Simon Jarvis
+* Copyright: 2006 Simon Jarvis
+* Date: 03/08/06
+* Updated: 07/02/07
+* Requirements: PHP 4/5 with GD and FreeType libraries
+* Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php
+* 
+* This program is free software; you can redistribute it and/or 
+* modify it under the terms of the GNU General Public License 
+* as published by the Free Software Foundation; either version 2 
+* of the License, or (at your option) any later version.
+* 
+* This program is distributed in the hope that it will be useful, 
+* but WITHOUT ANY WARRANTY; without even the implied warranty of 
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
+* GNU General Public License for more details: 
+* http://www.gnu.org/licenses/gpl.html
+*
+*/
+
+class CaptchaSecurityImages {
+
+       var $font = "monofont.ttf";
+
+       function generateCode($characters) {
+               /* list all possible characters, similar looking characters and vowels have been removed */
+               $possible = '23456789bcdfghjkmnpqrstvwxyz';
+               $code = '';
+               $i = 0;
+               while ($i < $characters) { 
+                       $code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
+                       $i++;
+               }
+               return $code;
+       }
+
+       function CaptchaSecurityImages($width='120',$height='40',$characters='6') {
+                 $this->font = dirname(__FILE__)."/".$this->font;
+               $code = $this->generateCode($characters);
+               /* font size will be 75% of the image height */
+               $font_size = $height * 0.75;
+               $image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
+               /* set the colours */
+               $background_color = imagecolorallocate($image, 255, 255, 255);
+               $text_color = imagecolorallocate($image, 20, 40, 100);
+               $noise_color = imagecolorallocate($image, 100, 120, 180);
+               /* generate random dots in background */
+               for( $i=0; $i<($width*$height)/3; $i++ ) {
+                       imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
+               }
+               /* generate random lines in background */
+               for( $i=0; $i<($width*$height)/150; $i++ ) {
+                       imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
+               }
+               /* create textbox and add text */
+               $textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
+               $x = ($width - $textbox[4])/2;
+               $y = ($height - $textbox[5])/2;
+               imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
+               /* output captcha image to browser */
+               header('Content-Type: image/jpeg');
+               imagejpeg($image);
+        imagedestroy($image);
+        $_SESSION['security_code'] = $code;
+        //error_log("Capchar set security code:".$code);
+       }
+
+}
+
+$width = isset($_GET['width']) ? $_GET['width'] : '120';
+$height = isset($_GET['height']) ? $_GET['height'] : '40';
+$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '6';
+
+$captcha = new CaptchaSecurityImages($width,$height,$characters);
+
+?>