public function encode($data)
{
// Set the rand type if it has not already been set
if (Encrypt::$_rand === NULL) {
$is_windows = DIRECTORY_SEPARATOR === '\\';
if ($is_windows) {
// Windows only supports the system random number generator
Encrypt::$_rand = MCRYPT_RAND;
} else {
if (defined('MCRYPT_DEV_URANDOM')) {
// Use /dev/urandom
Encrypt::$_rand = MCRYPT_DEV_URANDOM;
} elseif (defined('MCRYPT_DEV_RANDOM')) {
// Use /dev/random
Encrypt::$_rand = MCRYPT_DEV_RANDOM;
} else {
// Use the system random number generator
Encrypt::$_rand = MCRYPT_RAND;
}
}
}
if (Encrypt::$_rand === MCRYPT_RAND) {
// The system random number generator must always be seeded each
// time it is used, or it will not produce true random results
mt_srand();
}
// Create a random initialization vector of the proper size for the current cipher
$iv = mcrypt_create_iv($this->_iv_size, Encrypt::$_rand);
// Encrypt the data using the configured options and generated iv
$data = mcrypt_encrypt($this->_cipher, $this->_key, $data, $this->_mode, $iv);
// Use base64 encoding to convert to a string
return base64_encode($iv . $data);
}
/**
* Proxy for the mcrypt_create_iv function - to allow mocking and testing against KAT vectors
*
* @return string the initialization vector or FALSE on error
*/
protected function _create_iv()
{
/*
* Silently use MCRYPT_DEV_URANDOM when the chosen random number generator
* is not one of those that are considered secure.
*
* Also sets Encrypt::$_rand to MCRYPT_DEV_URANDOM when it's not already set
*/
if (Encrypt::$_rand !== MCRYPT_DEV_URANDOM and Encrypt::$_rand !== MCRYPT_DEV_RANDOM) {
Encrypt::$_rand = MCRYPT_DEV_URANDOM;
}
// Create a random initialization vector of the proper size for the current cipher
return mcrypt_create_iv($this->_iv_size, Encrypt::$_rand);
}
