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@NogDogOct 01.2010 — #If you have the MCrypt extension installed and the Rijndael-192 algorithm available, here's some code I created awhile ago:
Evaluate security of this encryption
Hi,
I m looking for file encryption methods and found following .
[url]http://bit.ly/98NZ5x
It would be a great help, if experts in here can evaluate security of the same.
Thanks and Best Regards
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@NogDogOct 01.2010 — #If you have the MCrypt extension installed and the Rijndael-192 algorithm available, here's some code I created awhile ago:[code=php]
<?php
/**
* Encryption/Decryption using rijndael-192 algorithm
*/
class MyCrypt
{
private $resource;
private $iv;
private $key;
/**
* Constructor
* @return void
* @param string $key Ecryption/decryption key
*/
public function __construct($key)
{
$this->key = $key;
$this->resource = mcrypt_module_open('rijndael-192', '', 'cbc', '');
if($this->resource === false) {
throw new Exception("Unable to init mcrypt");
}
$this->iv = substr(md5($this->key), 0,
mcrypt_enc_get_iv_size($this->resource));
}
/**
* Destructor
* @return void;
*/
public function __destruct()
{
if(!empty($this->resource)) {
mcrypt_module_close($this->resource);
}
}
/**
* Encrypt text
* @return string
* @param string $text Text to encrypt
*/
public function encrypt($text)
{
mcrypt_generic_init($this->resource, $this->key, $this->iv);
$encrypted = mcrypt_generic($this->resource, $text);
mcrypt_generic_deinit($this->resource);
return $encrypted;
}
/**
* Decrypt encrypted text
* @return string
* @param string $text Text to be decrypted
* @param bool $trim True (default) to trim output
*/
public function decrypt($text, $trim = true)
{
mcrypt_generic_init($this->resource, $this->key, $this->iv);
$decrypted = mdecrypt_generic($this->resource, $text);
mcrypt_generic_deinit($this->resource);
return ($trim) ? trim($decrypted) : $decrypted;
}
}
///// Sample usage /////
try {
$test = new MyCrypt('fubar');
$encrypted = $test->encrypt(file_get_contents(__FILE__));
unset($test); // show that it works when re-init object
$test = new MyCrypt('fubar');
$decrypted = $test->decrypt($encrypted);
highlight_string($decrypted);
}
catch (Exception $e) {
echo "<pre>".print_r($e, true)."</pre>";
}
[/code]