initial commit of laravel!

system/crypt.php

@@ -0,0 +1,132 @@
+<?php namespace System;
+
+class Crypt {
+
+	/**
+	 * The encryption cipher.
+	 *
+	 * @var string
+	 */
+	public static $cipher = 'rijndael-256';
+
+	/**
+	 * The encryption mode.
+	 *
+	 * @var string
+	 */
+	public static $mode = 'cbc';
+
+	/**
+	 * Encrypt a value using the MCrypt library.
+	 *
+	 * @param  string  $value
+	 * @return string
+	 */
+	public static function encrypt($value)
+	{
+		// -----------------------------------------------------
+		// Determine the input vector source.
+		// -----------------------------------------------------
+		if (defined('MCRYPT_DEV_URANDOM'))
+		{
+			$random = MCRYPT_DEV_URANDOM;
+		}
+		elseif (defined('MCRYPT_DEV_RANDOM'))
+		{
+			$random = MCRYPT_DEV_RANDOM;
+		}
+		else
+		{
+			$random = MCRYPT_RAND;
+		}
+
+		// -----------------------------------------------------
+		// The system random number generator must be seeded.
+		// -----------------------------------------------------
+		if ($random === MCRYPT_RAND)
+		{
+			mt_srand();
+		}
+
+		// -----------------------------------------------------
+		// Create the input vector.
+		// -----------------------------------------------------
+		$iv = mcrypt_create_iv(static::iv_size(), $random);
+
+		// -----------------------------------------------------
+		// Encrypt the value using MCrypt.
+		// -----------------------------------------------------
+		$value = mcrypt_encrypt(static::$cipher, static::key(), $value, static::$mode, $iv);
+
+		// -----------------------------------------------------
+		// Use base64 encoding to get a string value.
+		// -----------------------------------------------------
+		return base64_encode($iv.$value);
+	}
+
+	/**
+	 * Decrypt a value using the MCrypt library.
+	 *
+	 * @param  string  $value
+	 * @return string
+	 */
+	public static function decrypt($value)
+	{
+		// -----------------------------------------------------
+		// Decode the base64 value.
+		// -----------------------------------------------------
+		$value = base64_decode($value, true);
+
+		// -----------------------------------------------------
+		// Validate the base64 conversion.
+		// -----------------------------------------------------
+		if ( ! $value)
+		{
+			throw new \Exception('Decryption error. Input value is not valid base64 data.');
+		}
+
+		// -----------------------------------------------------
+		// Extract the input vector from the value.
+		// -----------------------------------------------------
+		$iv = substr($value, 0, static::iv_size());
+
+		// -----------------------------------------------------
+		// Remove the input vector from the value.
+		// -----------------------------------------------------
+		$value = substr($value, static::iv_size());
+
+		// -----------------------------------------------------
+		// Decrypt the value using MCrypt.
+		// -----------------------------------------------------
+		return rtrim(mcrypt_decrypt(static::$cipher, static::key(), $value, static::$mode, $iv), "\0");
+	}
+
+	/**
+	 * Get the application key.
+	 *
+	 * @return string
+	 */
+	private static function key()
+	{
+		// -----------------------------------------------------
+		// Validate the application key.
+		// -----------------------------------------------------
+		if (is_null($key = Config::get('application.key')) or $key == '')
+		{
+			throw new \Exception("The encryption class can not be used without an encryption key.");
+		}
+
+		return $key;
+	}
+
+	/**
+	 * Get the input vector size for the cipher and mode.
+	 *
+	 * @return int
+	 */
+	private static function iv_size()
+	{
+		return mcrypt_get_iv_size(static::$cipher, static::$mode);
+	}
+
+}