first commit of 2.0

laravel/crypter.php

@@ -0,0 +1,118 @@
+<?php namespace Laravel;
+
+class Crypter {
+
+	/**
+	 * The encryption cipher.
+	 *
+	 * @var string
+	 */
+	public $cipher;
+
+	/**
+	 * The encryption mode.
+	 *
+	 * @var string
+	 */
+	public $mode;
+
+	/**
+	 * Create a new Crypter instance.
+	 *
+	 * @param  string  $cipher
+	 * @param  string  $mode
+	 * @return void
+	 */
+	public function __construct($cipher = 'rijndael-256', $mode = 'cbc')
+	{
+		$this->cipher = $cipher;
+		$this->mode = $mode;
+	}
+
+	/**
+	 * Create a new Crypter instance.
+	 *
+	 * @param  string  $cipher
+	 * @param  string  $mode
+	 * @return Crypt
+	 */
+	public static function make($cipher = 'rijndael-256', $mode = 'cbc')
+	{
+		return new static($cipher, $mode);
+	}
+
+	/**
+	 * Encrypt a value using the MCrypt library.
+	 *
+	 * @param  string  $value
+	 * @return string
+	 */
+	public function encrypt($value)
+	{
+		$iv = mcrypt_create_iv($this->iv_size(), $this->randomizer());
+
+		return base64_encode($iv.mcrypt_encrypt($this->cipher, $this->key(), $value, $this->mode, $iv));
+	}
+
+	/**
+	 * Get the random number source available to the OS.
+	 *
+	 * @return int
+	 */
+	protected function randomizer()
+	{
+		if (defined('MCRYPT_DEV_URANDOM'))
+		{
+			return MCRYPT_DEV_URANDOM;
+		}
+		elseif (defined('MCRYPT_DEV_RANDOM'))
+		{
+			return MCRYPT_DEV_RANDOM;
+		}
+
+		return MCRYPT_RAND;
+	}
+
+	/**
+	 * Decrypt a value using the MCrypt library.
+	 *
+	 * @param  string  $value
+	 * @return string
+	 */
+	public function decrypt($value)
+	{
+		if ( ! is_string($value = base64_decode($value, true)))
+		{
+			throw new \Exception('Decryption error. Input value is not valid base64 data.');
+		}
+
+		list($iv, $value) = array(substr($value, 0, $this->iv_size()), substr($value, $this->iv_size()));
+
+		return rtrim(mcrypt_decrypt($this->cipher, $this->key(), $value, $this->mode, $iv), "\0");
+	}
+
+	/**
+	 * Get the application key from the application configuration file.
+	 *
+	 * @return string
+	 */
+	private function key()
+	{
+		if ( ! is_null($key = Config::get('application.key')) and $key !== '') return $key;
+
+		throw new \Exception("The encryption class can not be used without an encryption key.");
+	}
+
+	/**
+	 * Get the input vector size for the cipher and mode.
+	 *
+	 * Different ciphers and modes use varying lengths of input vectors.
+	 *
+	 * @return int
+	 */
+	private function iv_size()
+	{
+		return mcrypt_get_iv_size($this->cipher, $this->mode);
+	}
+
+}