Location: PHPKode > scripts > Secure Session Management > secure-session-management/systems/mcrypt_cryptography.php
<?php
/* 
############################[     <about>         ] ####################### 
    Author ::                	Bijaya Kumar Behera  <hide@address.com> 
	Website ::					http://digitalwebsolutions.in
    Add ::					    +91 9911033016 ,011-25331969                    
############################[      </about>         ] ####################### 
*/ 
class mcryptCryptography {
    private $hiddenKey,  $iv_size , $td ;
    function __construct($hiddenKey) {
		$this->hiddenKey =md5($hiddenKey);
       	$this->td = mcrypt_module_open('des', '','cfb', '');
	  	$this->hiddenKey  = substr($this->hiddenKey, 0, mcrypt_enc_get_key_size($this->td));
	  	$this->iv_size = mcrypt_enc_get_iv_size($this->td);
   }
    function encrypt($input) {
		$iv = mcrypt_create_iv($this->iv_size, MCRYPT_RAND);
		if (mcrypt_generic_init($this->td, $this->hiddenKey, $iv) != -1) {
		    $c_t = mcrypt_generic($this->td, $input);
            $c_t = $iv.$c_t;
       		return base64_encode( $c_t) ;
   		} 
   		return null;
	}
    function decrypt($encrypted) {
		$encrypted = base64_decode($encrypted) ;
		$iv = substr($encrypted,0,$this->iv_size);
 		$encrypted = substr($encrypted,$this->iv_size);
	    if (mcrypt_generic_init($this->td, $this->hiddenKey, $iv) != -1) {
		  $c_t = mdecrypt_generic($this->td, $encrypted);
		   return $c_t;
	   } 
   	   return null;        
    }
	public static function  &getInstance() {
		static $objCipher = array() ;
		if( !$objCipher ) {
			$objCipher[0]= & new mcryptCryptography( defined(SECURITY_SALT) ? SECURITY_SALT : $_SERVER['SERVER_NAME'] );
		}
		return  $objCipher[0];	
	}
	public function __destruct() {
		$o =mcryptCryptography::getInstance() ;
		mcrypt_generic_deinit($this->td);
		mcrypt_module_close($this->td);
		unset($o );
	}	
}
?>
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