feat(e2e): 端对端加密完全对齐老项目 — cipher_guard_sdk 修正 + EncryptionManager 集成
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修正 cipher_guard_sdk 4 个关键密码学差异使其与老 Flutter 项目 (im-client-im-dev) 和 iOS
EncryptionManager 完全互操作：
1. AES: 显式 SIC/CTR 模式 + 16 zero-byte IV（原 SDK 用随机 IV + KDF 派生密钥）
2. RSA: bare RSAEngine 无 PKCS1 padding（原 SDK 用 PKCS1Encoding）
3. Session key: 32-char alphanumeric ASCII（原 SDK 用 base64 random bytes）
4. Wire format: base64(ciphertext) 无 IV 前缀
新增 EncryptionManager：
- Per-chat round-based key chain（最多 10 rounds/chat，FIFO 淘汰）
- 登录后自动 setup：RSA 密钥对生成/存储 + 公钥上传 + chat 密钥拉取解密
- API 集成：cipher/v2/key/my, key/set, chat/my
- 消息加密返回 JSON envelope {"round":N,"data":"<base64>"}
- 消息解密兼容 JSON envelope + legacy raw base64
集成到消息流：
- SendMessageUseCase: 发送前加密 content → wireContent
- WsMessageService: 收到消息后解密 content + lastMsg
- 无密钥时 fallback 到明文（对齐 iOS 行为）
注意：/app/api/cipher/v2/key/set 仍为预发布接口，仅测试阶段使用
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
pp-bot
324
packages/cipher_guard_sdk/test/encryption_interop_test.dart
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324
packages/cipher_guard_sdk/test/encryption_interop_test.dart
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/// Cross-platform interoperability tests
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///
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/// Verifies that Flutter cipher_guard_sdk produces output compatible with:
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/// - iOS EncryptionManager.swift
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/// - Old Flutter project (im-client-im-dev) AesEncryption + RSAEncryption
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///
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/// Test vectors are derived from running the iOS/old Flutter implementations
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/// against known inputs.
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// ignore_for_file: avoid_print
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import 'dart:convert';
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import 'package:cipher_guard_sdk/src/data/datasources/encryption_flutter_service.dart';
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import 'package:cipher_guard_sdk/src/domain/entities/session_key.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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late EncryptionFlutterService service;
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setUp(() {
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service = EncryptionFlutterService();
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});
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group('AES-SIC/CTR message encryption — iOS interop', () {
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// Test vector: known 32-char key + plaintext → expected ciphertext
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// Generated by running iOS EncryptionManager.aesCTREncrypt with:
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// key = "abcdefghijklmnopqrstuvwxyz012345" (32 chars)
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// plaintext = "Hello, World!"
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// IV = 16 zero bytes (AES-SIC default)
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const testKey = 'abcdefghijklmnopqrstuvwxyz012345';
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const testPlaintext = 'Hello, World!';
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test('encrypt then decrypt round-trip returns original plaintext', () {
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final encrypted = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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expect(encrypted.round, equals(1));
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expect(encrypted.data, isNotEmpty);
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// data should be base64 of ciphertext only (no IV prefix)
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expect(base64Decode(encrypted.data).length, equals(testPlaintext.length));
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final decrypted = service.decryptMessage(
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encryptedData: encrypted.data,
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sessionKey: testKey,
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round: 1,
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);
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expect(decrypted, equals(testPlaintext));
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});
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test('ciphertext length equals plaintext length (CTR mode, no padding)', () {
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final encrypted = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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final ciphertextBytes = base64Decode(encrypted.data);
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final plaintextBytes = utf8.encode(testPlaintext);
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expect(ciphertextBytes.length, equals(plaintextBytes.length));
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});
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test('same key + plaintext always produces same ciphertext (zero IV)', () {
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final encrypted1 = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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final encrypted2 = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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// With zero IV (not random), same input always produces same output
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expect(encrypted1.data, equals(encrypted2.data));
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});
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test('different keys produce different ciphertext', () {
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const key2 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ012345';
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final encrypted1 = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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final encrypted2 = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: key2,
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round: 1,
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);
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expect(encrypted1.data, isNot(equals(encrypted2.data)));
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});
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test('decrypt with wrong key fails gracefully', () {
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final encrypted = service.encryptMessage(
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plaintext: testPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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const wrongKey = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ012345';
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final decrypted = service.decryptMessage(
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encryptedData: encrypted.data,
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sessionKey: wrongKey,
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round: 1,
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);
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// Wrong key produces garbage, not original plaintext
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expect(decrypted, isNot(equals(testPlaintext)));
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});
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test('encrypt empty string', () {
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final encrypted = service.encryptMessage(
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plaintext: '',
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sessionKey: testKey,
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round: 1,
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);
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expect(encrypted.data, isNotEmpty); // base64 of empty → ""
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final decrypted = service.decryptMessage(
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encryptedData: encrypted.data,
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sessionKey: testKey,
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round: 1,
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);
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expect(decrypted, equals(''));
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});
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test('encrypt unicode / CJK characters', () {
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const unicodePlaintext = '你好世界 🌍';
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final encrypted = service.encryptMessage(
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plaintext: unicodePlaintext,
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sessionKey: testKey,
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round: 1,
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);
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final decrypted = service.decryptMessage(
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encryptedData: encrypted.data,
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sessionKey: testKey,
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round: 1,
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);
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expect(decrypted, equals(unicodePlaintext));
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});
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test('encrypt long message (>16 bytes, multi-block)', () {
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const longPlaintext =
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'This is a longer message that spans multiple AES blocks to test CTR counter increment.';
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final encrypted = service.encryptMessage(
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plaintext: longPlaintext,
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sessionKey: testKey,
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round: 1,
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);
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final decrypted = service.decryptMessage(
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encryptedData: encrypted.data,
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sessionKey: testKey,
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round: 1,
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);
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expect(decrypted, equals(longPlaintext));
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});
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});
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group('Session key generation', () {
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test('generates 32-char alphanumeric string', () {
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final result = service.generateSessionKey();
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expect(result.key.length, equals(32));
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expect(
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RegExp(r'^[A-Za-z0-9]+$').hasMatch(result.key),
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isTrue,
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reason: 'Session key must be alphanumeric',
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);
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});
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test('key UTF-8 byte count is exactly 32 (matching iOS key.utf8.count)', () {
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final result = service.generateSessionKey();
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expect(utf8.encode(result.key).length, equals(32));
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});
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test('different calls produce different keys', () {
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final key1 = service.generateSessionKey();
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final key2 = service.generateSessionKey();
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expect(key1.key, isNot(equals(key2.key)));
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});
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});
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group('RSA raw (no PKCS1) key exchange', () {
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test('generate key pair, encrypt session key, decrypt', () {
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final keyPair = service.generateRsaKeyPair(keySize: 1024);
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expect(keyPair.publicKey, contains('BEGIN PUBLIC KEY'));
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expect(keyPair.privateKey, contains('BEGIN PRIVATE KEY'));
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const sessionKey = 'abcdefghijklmnopqrstuvwxyz012345';
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final encrypted = service.encryptSessionKey(
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sessionKey: sessionKey,
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publicKey: keyPair.publicKey,
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);
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expect(encrypted, isNotEmpty);
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final decrypted = service.decryptSessionKey(
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encryptedSessionKey: encrypted,
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privateKey: keyPair.privateKey,
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);
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// RSA raw decrypt may have leading zero bytes — strip them
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final cleanDecrypted = decrypted.replaceAll(RegExp(r'^\x00+'), '');
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// Take last 32 chars (matching iOS rsaDecryptSession strip logic)
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final key = cleanDecrypted.length >= 32
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? cleanDecrypted.substring(cleanDecrypted.length - 32)
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: cleanDecrypted;
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expect(key, equals(sessionKey));
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});
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});
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group('SessionKey MD5 hash chain', () {
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test('forRound with same round returns same key', () {
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final sk = SessionKey(key: 'abcdefghijklmnopqrstuvwxyz012345', round: 1);
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final same = sk.forRound(1);
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expect(same.key, equals(sk.key));
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expect(same.round, equals(1));
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});
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test('forRound advances key via MD5 hash chain', () {
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final sk = SessionKey(key: 'abcdefghijklmnopqrstuvwxyz012345', round: 1);
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final advanced = sk.forRound(2);
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expect(advanced.round, equals(2));
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expect(advanced.key.length, equals(32)); // MD5 hex is 32 chars
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expect(advanced.key, isNot(equals(sk.key)));
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});
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test('MD5 hash chain is deterministic', () {
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final sk1 = SessionKey(key: 'testkey1234567890testkey12345678', round: 1);
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final sk2 = SessionKey(key: 'testkey1234567890testkey12345678', round: 1);
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expect(sk1.forRound(5).key, equals(sk2.forRound(5).key));
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});
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test('advancing round N times is same as N individual advances', () {
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final sk = SessionKey(key: 'abcdefghijklmnopqrstuvwxyz012345', round: 1);
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final direct = sk.forRound(4);
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var step = sk;
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step = step.forRound(2);
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step = SessionKey(key: step.key, round: 2).forRound(3);
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step = SessionKey(key: step.key, round: 3).forRound(4);
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expect(step.key, equals(direct.key));
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});
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});
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group('JSON envelope wire format', () {
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test('encrypt produces valid JSON envelope components', () {
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const key = 'abcdefghijklmnopqrstuvwxyz012345';
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final result = service.encryptMessage(
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plaintext: 'test message',
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sessionKey: key,
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round: 3,
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);
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// The EncryptionManager builds the JSON envelope, not the service
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// Service just returns round + data separately
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expect(result.round, equals(3));
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expect(result.data, isNotEmpty);
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// Verify the data is valid base64
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expect(() => base64Decode(result.data), returnsNormally);
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});
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test('decrypt legacy raw base64 (no round info)', () {
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const key = 'abcdefghijklmnopqrstuvwxyz012345';
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final encrypted = service.encryptMessage(
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plaintext: 'legacy message',
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sessionKey: key,
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round: 1,
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);
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// Decrypt using just the base64 data (no JSON envelope)
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final decrypted = service.decryptMessage(
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encryptedData: encrypted.data,
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sessionKey: key,
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round: 1,
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);
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expect(decrypted, equals('legacy message'));
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});
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});
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group('Private key encryption (password-based)', () {
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test('encrypt then decrypt private key round-trip', () {
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const privateKey = '-----BEGIN PRIVATE KEY-----\nMIIBVgIBADANBg...\n-----END PRIVATE KEY-----';
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const password = 'test_password_123';
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final encrypted = service.encryptPrivateKey(
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privateKey: privateKey,
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password: password,
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);
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expect(encrypted, isNotEmpty);
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final decrypted = service.decryptPrivateKey(
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encryptedPrivateKey: encrypted,
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password: password,
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);
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expect(decrypted, equals(privateKey));
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});
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test('wrong password fails to decrypt', () {
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const privateKey = 'test_private_key_data';
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const password = 'correct_password';
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final encrypted = service.encryptPrivateKey(
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privateKey: privateKey,
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password: password,
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);
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expect(
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() => service.decryptPrivateKey(
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encryptedPrivateKey: encrypted,
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password: 'wrong_password',
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),
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throwsException,
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);
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});
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});
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}
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