112 lines
2.2 KiB
PHP
112 lines
2.2 KiB
PHP
<?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)
|
|
{
|
|
// Seed the system random number generator if it is being used.
|
|
if (($random = static::randomizer()) === MCRYPT_RAND)
|
|
{
|
|
mt_srand();
|
|
}
|
|
|
|
$iv = mcrypt_create_iv(static::iv_size(), $random);
|
|
|
|
$value = mcrypt_encrypt(static::$cipher, static::key(), $value, static::$mode, $iv);
|
|
|
|
return base64_encode($iv.$value);
|
|
}
|
|
|
|
/**
|
|
* Decrypt a value using the MCrypt library.
|
|
*
|
|
* @param string $value
|
|
* @return string
|
|
*/
|
|
public static function decrypt($value)
|
|
{
|
|
$value = base64_decode($value, true);
|
|
|
|
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 encrypted value.
|
|
$value = substr($value, static::iv_size());
|
|
|
|
return rtrim(mcrypt_decrypt(static::$cipher, static::key(), $value, static::$mode, $iv), "\0");
|
|
}
|
|
|
|
/**
|
|
* Get the random number source that should be used for the OS.
|
|
*
|
|
* @return int
|
|
*/
|
|
private static function randomizer()
|
|
{
|
|
if (defined('MCRYPT_DEV_URANDOM'))
|
|
{
|
|
return MCRYPT_DEV_URANDOM;
|
|
}
|
|
elseif (defined('MCRYPT_DEV_RANDOM'))
|
|
{
|
|
return MCRYPT_DEV_RANDOM;
|
|
}
|
|
else
|
|
{
|
|
return MCRYPT_RAND;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the application key from the application configuration file.
|
|
*
|
|
* @return string
|
|
*/
|
|
private static function key()
|
|
{
|
|
if (is_null($key = Config::get('application.key')) or $key == '')
|
|
{
|
|
throw new \Exception("The encryption class can not be used without an encryption key.");
|
|
}
|
|
|
|
return $key;
|
|
}
|
|
|
|
/**
|
|
* Get the input vector size for the cipher and mode.
|
|
*
|
|
* Different ciphers and modes use varying lengths of input vectors.
|
|
*
|
|
* @return int
|
|
*/
|
|
private static function iv_size()
|
|
{
|
|
return mcrypt_get_iv_size(static::$cipher, static::$mode);
|
|
}
|
|
|
|
} |