tunnelkit/Tests/TunnelKitOpenVPNTests/XORTests.swift

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//
// XORTests.swift
// TunnelKitOpenVPNTests
//
// Created by Davide De Rosa on 11/4/22.
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// Copyright (c) 2023 Davide De Rosa. All rights reserved.
//
// https://github.com/passepartoutvpn
//
// This file is part of TunnelKit.
//
// TunnelKit is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// TunnelKit is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with TunnelKit. If not, see <http://www.gnu.org/licenses/>.
//
import XCTest
import TunnelKitCore
import TunnelKitOpenVPNProtocol
import CTunnelKitOpenVPNProtocol
final class XORTests: XCTestCase {
private let mask = Data(hex: "f76dab30")
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override func setUpWithError() throws {
// Put setup code here. This method is called before the invocation of each test method in the class.
}
override func tearDownWithError() throws {
// Put teardown code here. This method is called after the invocation of each test method in the class.
}
func testMask() throws {
let processor = XORProcessor(method: .xormask(mask: mask))
processor.assertReversible(try SecureRandom.data(length: 1000))
}
func testPtrPos() throws {
let processor = XORProcessor(method: .xorptrpos)
processor.assertReversible(try SecureRandom.data(length: 1000))
}
func testReverse() throws {
let processor = XORProcessor(method: .reverse)
processor.assertReversible(try SecureRandom.data(length: 1000))
}
func testObfuscate() throws {
let processor = XORProcessor(method: .obfuscate(mask: mask))
processor.assertReversible(try SecureRandom.data(length: 1000))
}
func testPacketStream() throws {
let data = try SecureRandom.data(length: 10000)
PacketStream.assertReversible(data, method: .none)
PacketStream.assertReversible(data, method: .mask, mask: mask)
PacketStream.assertReversible(data, method: .ptrPos)
PacketStream.assertReversible(data, method: .reverse)
PacketStream.assertReversible(data, method: .obfuscate, mask: mask)
}
}
private extension XORProcessor {
func assertReversible(_ data: Data) {
let xored = processPacket(data, outbound: true)
XCTAssertEqual(processPacket(xored, outbound: false), data)
}
}
private extension PacketStream {
static func assertReversible(_ data: Data, method: XORMethodNative, mask: Data? = nil) {
var until = 0
let outStream = PacketStream.outboundStream(fromPacket: data, xorMethod: method, xorMask: mask)
let inStream = PacketStream.packets(fromInboundStream: outStream, until: &until, xorMethod: method, xorMask: mask)
let originalData = Data(inStream.joined())
XCTAssertEqual(data.toHex(), originalData.toHex())
}
}