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<?php
/**
* Short description for file.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2009, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2009, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs
* @since CakePHP(tm) v .0.10.0.1233
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

/**
* Short description for file.
*
* @package cake
* @subpackage cake.cake.libs
*/
class Security extends Object {

/**
* Default hash method
*
* @var string
* @access public
*/
var $hashType = null;

/**
* Singleton implementation to get object instance.
*
* @return object
* @access public
* @static
*/
function &getInstance() {
static $instance = array();
if (!$instance) {
$instance[0] =& new Security;
}
return $instance[0];
}

/**
* Get allowed minutes of inactivity based on security level.
*
* @return integer Allowed inactivity in minutes
* @access public
* @static
*/
function inactiveMins() {
switch (Configure::read('Security.level')) {
case 'high':
return 10;
break;
case 'medium':
return 100;
break;
case 'low':
default:
return 300;
break;
}
}

/**
* Generate authorization hash.
*
* @return string Hash
* @access public
* @static
*/
function generateAuthKey() {
if (!class_exists('String')) {
App::import('Core', 'String');
}
return Security::hash(String::uuid());
}

/**
* Validate authorization hash.
*
* @param string $authKey Authorization hash
* @return boolean Success
* @access public
* @static
* @todo Complete implementation
*/
function validateAuthKey($authKey) {
return true;
}

/**
* Create a hash from string using given method.
* Fallback on next available method.
*
* @param string $string String to hash
* @param string $type Method to use (sha1/sha256/md5)
* @param boolean $salt If true, automatically appends the application's salt
* value to $string (Security.salt)
* @return string Hash
* @access public
* @static
*/
function hash($string, $type = null, $salt = false) {
$_this =& Security::getInstance();

if ($salt) {
if (is_string($salt)) {
$string = $salt . $string;
} else {
$string = Configure::read('Security.salt') . $string;
}
}

if (empty($type)) {
$type = $_this->hashType;
}
$type = strtolower($type);

if ($type == 'sha1' || $type == null) {
if (function_exists('sha1')) {
$return = sha1($string);
return $return;
}
$type = 'sha256';
}

if ($type == 'sha256' && function_exists('mhash')) {
return bin2hex(mhash(MHASH_SHA256, $string));
}

if (function_exists('hash')) {
return hash($type, $string);
}
return md5($string);
}

/**
* Sets the default hash method for the Security object. This affects all objects using
* Security::hash().
*
* @param string $hash Method to use (sha1/sha256/md5)
* @access public
* @return void
* @static
* @see Security::hash()
*/
function setHash($hash) {
$_this =& Security::getInstance();
$_this->hashType = $hash;
}

/**
* Encrypts/Decrypts a text using the given key.
*
* @param string $text Encrypted string to decrypt, normal string to encrypt
* @param string $key Key to use
* @return string Encrypted/Decrypted string
* @access public
* @static
*/
function cipher($text, $key) {
if (empty($key)) {
trigger_error(__('You cannot use an empty key for Security::cipher()', true), E_USER_WARNING);
return '';
}

srand(Configure::read('Security.cipherSeed'));
$out = '';

for ($i = 0; $i < strlen($text); $i++) {
for ($j = 0; $j < ord(substr($key, $i % strlen($key), 1)); $j++) {
$toss = rand(0, 255);
}
$mask = rand(0, 255);
$out .= chr(ord(substr($text, $i, 1)) ^ $mask);
}

srand();
return $out;
}
}
?>
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