public function decrypt($fullpath, $key, $ciphertext = false)
{
$this->ensure_phpseclib('Crypt_Rijndael', 'Crypt/Rijndael');
$rijndael = new Crypt_Rijndael();
if (defined('UPDRAFTPLUS_DECRYPTION_ENGINE')) {
if ('openssl' == UPDRAFTPLUS_DECRYPTION_ENGINE) {
$rijndael->setPreferredEngine(CRYPT_ENGINE_OPENSSL);
} elseif ('mcrypt' == UPDRAFTPLUS_DECRYPTION_ENGINE) {
$rijndael->setPreferredEngine(CRYPT_ENGINE_MCRYPT);
} elseif ('internal' == UPDRAFTPLUS_DECRYPTION_ENGINE) {
$rijndael->setPreferredEngine(CRYPT_ENGINE_INTERNAL);
}
}
$rijndael->setKey($key);
return false == $ciphertext ? $rijndael->decrypt(file_get_contents($fullpath)) : $rijndael->decrypt($ciphertext);
}