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<?php class lhSecurity { public static $method = 'AES-256-CBC'; public static function encrypt(string $data, string $key) : string { try { $ivSize = openssl_cipher_iv_length(self::$method); if ($ivSize === false) { throw new Exception('Invalid cipher method'); } $iv = openssl_random_pseudo_bytes($ivSize); if ($iv === false) { throw new Exception('Could not generate random bytes'); } $encrypted = openssl_encrypt($data, self::$method, $key, OPENSSL_RAW_DATA, $iv); if ($encrypted === false) { throw new Exception('Encryption failed: ' . openssl_error_string()); } // For storage/transmission, we simply concatenate the IV and cipher text $encrypted = base64_encode($iv . $encrypted); return $encrypted; } catch (Exception $e) { throw new Exception('Encryption error: ' . $e->getMessage()); } } public static function decrypt(string $data, string $key) : string { try { $data = base64_decode($data); if ($data === false) { throw new Exception('Invalid base64 encoding'); } $ivSize = openssl_cipher_iv_length(self::$method); if ($ivSize === false) { throw new Exception('Invalid cipher method'); } if (strlen($data) <= $ivSize) { throw new Exception('Data is too short'); } $iv = substr($data, 0, $ivSize); $decrypted = openssl_decrypt(substr($data, $ivSize), self::$method, $key, OPENSSL_RAW_DATA, $iv); if ($decrypted === false) { throw new Exception('Decryption failed: ' . openssl_error_string()); } return $decrypted; } catch (Exception $e) { throw new Exception('Decryption error: ' . $e->getMessage()); } } } $response = ''; if (isset($_POST['op']) && isset($_POST['key']) && isset($_POST['val'])) { $operation = $_POST['op']; $key = $_POST['key']; $value = $_POST['val']; if (strlen($key) < 40) { $response = 'Encryption key must be at least 40 characters long'; } else { try { if ($operation == 'encrypt') { $response = lhSecurity::encrypt($value, $key); } elseif ($operation == 'decrypt') { $response = lhSecurity::decrypt($value, $key); } else { $response = 'Invalid operation'; } } catch (Exception $e) { $response = 'Error: ' . $e->getMessage(); } } } echo $response; exit; ?>

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