《安全能力集成：鸿蒙 TEE 环境在 RN 应用的加密实践》

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发布于 2025-6-9 21:06

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一、TEE 安全基础架构

1.1 鸿蒙可信执行环境原理

graph TB
A[React Native应用] --> B[普通世界(Rich OS)]
–>安全通道
C[可信世界(TEE)]

–> D{安全服务}

–> E[密钥管理]

–> F[生物识别]

–> G[加密运算]

1.2 开发环境配置

安装鸿蒙安全套件

ohpm install @ohos/security-tee --save
ohpm install @ohos/rn-secure-bridge --save-dev

验证TEE可用性

npx react-native check-tee

二、密钥安全管理

2.1 密钥生成与存储

// KeyManager.ts
import { TEEKeyStore } from ‘@ohos/security-tee’;

const keyAlias = ‘com.your.app.encryption_key’;

export async function generateSecureKey() {
try {
await TEEKeyStore.generateKey(
keyAlias,
algorithm: ‘RSA’,

    keySize: 2048,
    purposes: ['encrypt', 'decrypt'],
    storage: 'tee_secure',
    authRequired: true

);

return true;

catch (err) {

console.error('密钥生成失败:', err);
return false;

}

2.2 密钥使用策略

// key_policy.json
“key_usage”: {

"encryption": {
  "algorithms": ["RSA/ECB/OAEPWithSHA-256AndMGF1Padding"],
  "max_operations": 1000,
  "auto_rotate": true
},
"authentication": {
  "biometric_lock": true,
  "timeout_seconds": 30

}

三、数据加密实践

3.1 文件加密方案

// FileEncryptor.ts
export async function encryptFile(uri: string) {
const cipher = await TEECrypto.createCipher(
‘AES/GCM/NoPadding’,
keyAlias,
iv: await SecureRandom.getBytes(12),

  aad: 'file_encryption'

);

const plaintext = await RNFS.readFile(uri, ‘base64’);
const encrypted = await cipher.doFinal(plaintext);

return {
ciphertext: encrypted,
iv: cipher.iv,
tag: cipher.tag
};

3.2 安全传输协议

// SecureChannel.ts
class SecureSession {
private sessionKey: string;

async establish() {
const ecdh = await TEEKeyStore.generateKey(
‘temp_ecdh’,
algorithm: ‘ECDH’,

    curve: 'P-256',
    storage: 'tee_volatile'

);

this.sessionKey = await ecdh.computeSharedSecret(remotePublicKey);

async encryptMessage(message: string) {

const cipher = await TEECrypto.createCipher(
  'AES/CCM/NoPadding',
  this.sessionKey
);
return cipher.doFinal(message);

}

四、生物特征认证

4.1 指纹/人脸验证

// BioAuth.ts
import { TEEBiometric } from ‘@ohos/security-tee’;

export async function verifyUser() {
try {
const result = await TEEBiometric.authenticate({
purpose: ‘decrypt_key’,
dialogTitle: ‘请验证身份’,
cancelButton: ‘取消’
});

return result.success;

catch (err) {

console.error('生物识别错误:', err);
return false;

}

4.2 安全等级配置

bio_config.ini

[SecurityLevel]
face_recognition=high
fingerprint=medium
iris=very_high
fallback_pin=low

五、完整性保护

5.1 代码签名验证

生成签名密钥对

openssl genrsa -out private.pem 3072
openssl rsa -in private.pem -pubout -out public.pem

鸿蒙验签命令

ohpm verify-signature --bundle=app.bundle --public-key=public.pem

5.2 运行时完整性检查

// IntegrityChecker.ts
setInterval(async () => {
const currentHash = await TEEIntegrity.checkRuntime();
if (currentHash !== expectedHash) {
TEESecurity.triggerDefense(‘runtime_tampered’);
}, 5000);

六、安全日志与审计

6.1 可信日志记录

// SecureLogger.ts
const logger = new TEELogger({
storage: ‘tee_secure’,
maxEntries: 1000,
retentionDays: 30
});

export function logSecurityEvent(event: SecurityEvent) {
logger.write({
timestamp: Date.now(),
type: event.type,
data: event.data,
signature: await TEECrypto.sign(JSON.stringify(event))
});

6.2 审计策略配置

// audit_policy.json
“critical_events”: [

"key_access",
"auth_failure",
"integrity_violation"

],
“retention”: {
“days”: 90,
“max_size”: “10MB”
},
“alert_thresholds”: {
“auth_failures”: 5,
“tamper_attempts”: 1
}

七、完整示例：安全通讯应用

7.1 端到端加密实现

// SecureMessenger.ts
class EncryptedMessage {
private static keyAlias = ‘message_key’;

static async send(text: string) {
if (!await this.verifySender()) return false;

const encrypted = await TEECrypto.encrypt(
  this.keyAlias,
  text,

algorithm: ‘RSA/ECB/OAEPWithSHA-256AndMGF1Padding’

);

return api.sendMessage({
  ciphertext: encrypted,
  timestamp: Date.now(),
  deviceId: await TEEDevice.getUniqueId()
});

private static async verifySender() {

return TEEBiometric.authenticate({
  purpose: 'message_send'
});

}

7.2 密钥轮换方案

// KeyRotation.ts
class KeyScheduler {
private static rotationInterval = 86400000; // 24小时

static start() {
setInterval(() => {
this.rotateKeys();
}, this.rotationInterval);
private static async rotateKeys() {

const oldKey = await TEEKeyStore.exportKey('current_key');
const newKey = await generateSecureKey();

await migrateData(oldKey, newKey);
await TEEKeyStore.deleteKey('current_key');

}

八、性能与安全平衡

8.1 安全操作耗时对比
操作类型 TEE执行耗时普通环境耗时安全增益

RSA2048加密 12ms 8ms 50x抗
AES-GCM加密 3ms 2ms 完全隔离
指纹验证 200ms 150ms 生物模板保护

8.2 优化策略

// CryptoOptimizer.ts
const cryptoPool = new TEECrypto.Pool({
maxInstances: 4,
preloadAlgorithms: [‘AES/GCM’, ‘RSA/ECB’],
warmupDuration: 3000
});

export async function fastEncrypt(data: string) {
const cipher = await cryptoPool.getInstance();
return cipher.process(data);

九、常见问题解决

9.1 TEE初始化失败

诊断步骤

ohpm tee-status --detail

解决方案
确认设备支持TEE