1 files changed, 61 insertions, 0 deletions
diff --git a/system/libraries/drivers/Captcha/Math.php b/system/libraries/drivers/Captcha/Math.php
new file mode 100644
index 00000000..4ac20248
--- /dev/null
+++ b/system/libraries/drivers/Captcha/Math.php
@@ -0,0 +1,61 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Captcha driver for "math" style.
+ *
+ * $Id: Math.php 3769 2008-12-15 00:48:56Z zombor $
+ *
+ * @package    Captcha
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2008 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class Captcha_Math_Driver extends Captcha_Driver {
+
+	private $math_exercice;
+
+	/**
+	 * Generates a new Captcha challenge.
+	 *
+	 * @return  string  the challenge answer
+	 */
+	public function generate_challenge()
+	{
+		// Easy
+		if (Captcha::$config['complexity'] < 4)
+		{
+			$numbers[] = mt_rand(1, 5);
+			$numbers[] = mt_rand(1, 4);
+		}
+		// Normal
+		elseif (Captcha::$config['complexity'] < 7)
+		{
+			$numbers[] = mt_rand(10, 20);
+			$numbers[] = mt_rand(1, 10);
+		}
+		// Difficult, well, not really ;)
+		else
+		{
+			$numbers[] = mt_rand(100, 200);
+			$numbers[] = mt_rand(10, 20);
+			$numbers[] = mt_rand(1, 10);
+		}
+
+		// Store the question for output
+		$this->math_exercice = implode(' + ', $numbers).' = ';
+
+		// Return the answer
+		return array_sum($numbers);
+	}
+
+	/**
+	 * Outputs the Captcha riddle.
+	 *
+	 * @param   boolean  html output
+	 * @return  mixed
+	 */
+	public function render($html)
+	{
+		return $this->math_exercice;
+	}
+
+} // End Captcha Math Driver Class
+\ No newline at end of file