Gazelle/classes/encrypt.class.php

<?
/*************************************************************************|
|--------------- Encryption class ----------------------------------------|
|*************************************************************************|

This class handles encryption and decryption, that's all folks.

|*************************************************************************/

if (!extension_loaded('mcrypt')) {
	error('Mcrypt Extension not loaded.');
}

class CRYPT {
	public function encrypt($Str, $Key = ENCKEY) {
		srand();
		$Str = str_pad($Str, 32 - strlen($Str));
		$IVSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
		$IV = mcrypt_create_iv($IVSize, MCRYPT_RAND);
		$CryptStr = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $Key, $Str, MCRYPT_MODE_CBC, $IV);
		return base64_encode($IV.$CryptStr);
	}

	public function decrypt($CryptStr, $Key = ENCKEY) {
		if ($CryptStr != '') {
			$IV = substr(base64_decode($CryptStr), 0, 16);
			$CryptStr = substr(base64_decode($CryptStr), 16);
			return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $Key, $CryptStr, MCRYPT_MODE_CBC, $IV));
		} else {
			return '';
		}
	}
} // class ENCRYPT()
?>