Two Way Encryption With PHP Mcrypt
This class provides the functionality to encrypt and decrypt a text string. The class makes use of the PHP mcrypt extension which provides the ability to create two way encryption, or decoding of text messages.
<?php
// make it of break it
error_reporting(E_ALL);
/**
* Class to provide 2 way encryption of data
*
* @author Kevin Waterson
* @copyright 2009 PHPRO.ORG
*
*/
class proCrypt
{
/**
*
* This is called when we wish to set a variable
*
* @access public
* @param string $name
* @param string $value
*
*/
public function __set( $name, $value )
{
switch( $name)
{
case 'key':
case 'ivs':
case 'iv':
$this->$name = $value;
break;
default:
throw new Exception( "$name cannot be set" );
}
}
/**
*
* Gettor - This is called when an non existant variable is called
*
* @access public
* @param string $name
*
*/
public function __get( $name )
{
switch( $name )
{
case 'key':
return 'keee';
case 'ivs':
return mcrypt_get_iv_size( MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB );
case 'iv':
return mcrypt_create_iv( $this->ivs );
default:
throw new Exception( "$name cannot be called" );
}
}
/**
*
* Encrypt a string
*
* @access public
* @param string $text
* @return string The encrypted string
*
*/
public function encrypt( $text )
{
// add end of text delimiter
$data = mcrypt_encrypt( MCRYPT_RIJNDAEL_128, $this->key, $text, MCRYPT_MODE_ECB, $this->iv );
return base64_encode( $data );
}
/**
*
* Decrypt a string
*
* @access public
* @param string $text
* @return string The decrypted string
*
*/
public function decrypt( $text )
{
$text = base64_decode( $text );
return mcrypt_decrypt( MCRYPT_RIJNDAEL_128, $this->key, $text, MCRYPT_MODE_ECB, $this->iv );
}
} // end of class
Example Usage
<?php
// a new proCrypt instance
$crypt = new proCrypt;
// encrypt the string
$encoded = $crypt->encrypt( 'my message');
echo $encoded."\n";
// decrypt the string
echo $crypt->decrypt( $encoded ) . "\n";
?>