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Security.php
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Security.php
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<?php
/**
* Core Security
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake.libs
* @since CakePHP(tm) v .0.10.0.1233
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('String', 'Utility');
/**
* Security Library contains utility methods related to security
*
* @package cake.libs
*/
class Security {
/**
* Default hash method
*
* @var string
*/
public static $hashType = null;
/**
* Get allowed minutes of inactivity based on security level.
*
* @return integer Allowed inactivity in minutes
*/
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
*/
public static function generateAuthKey() {
return Security::hash(String::uuid());
}
/**
* Validate authorization hash.
*
* @param string $authKey Authorization hash
* @return boolean Success
* @todo Complete implementation
*/
function validateAuthKey($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 $string (Security.salt)
* @return string Hash
*/
public static function hash($string, $type = null, $salt = false) {
if ($salt) {
if (is_string($salt)) {
$string = $salt . $string;
} else {
$string = Configure::read('Security.salt') . $string;
}
}
if (empty($type)) {
$type = self::$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 $hash Method to use (sha1/sha256/md5)
* @return void
* @see Security::hash()
*/
public static function setHash($hash) {
self::$hashType = $hash;
}
/**
* Encrypts/Decrypts a text using the given key.
*
* @param string $text Encrypted string to decrypt, normal string to encrypt
* @param string $key Key to use
* @return string Encrypted/Decrypted string
*/
public static function cipher($text, $key) {
if (empty($key)) {
trigger_error(__d('cake_error', 'You cannot use an empty key for Security::cipher()'), E_USER_WARNING);
return '';
}
srand(Configure::read('Security.cipherSeed'));
$out = '';
$keyLength = strlen($key);
for ($i = 0, $textLength = strlen($text); $i < $textLength; $i++) {
$j = ord(substr($key, $i % $keyLength, 1));
while ($j--) {
rand(0, 255);
}
$mask = rand(0, 255);
$out .= chr(ord(substr($text, $i, 1)) ^ $mask);
}
srand();
return $out;
}
}