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本文旨在深入探讨华为鸿蒙HarmonyOS Next系统(截止目前API12)在智能家居系统安全加固中加解密技术的应用,基于实际开发经验进行总结。主要作为技术分享与交流载体,难免错漏,欢迎各位同仁提出宝贵意见和问题,以便共同进步。本文为原创内容,任何形式的转载必须注明出处及原作者。
import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';
// 假设智能家居系统认证服务器已经存储了设备的公钥(这里简化为直接生成一个公钥示例)
async function getDevicePublicKey(deviceId) {
let keyGenAlg = "ECC256";
let generator = cryptoFramework.createAsyKeyGenerator(keyGenAlg);
let keyPair = await generator.generateKeyPair();
return keyPair.pubKey;
}
// 设备认证函数
async function authenticateDevice(deviceId, deviceData, signature) {
let pubKey = await getDevicePublicKey(deviceId);
let verifyAlg = "ECC256|SHA256";
let verifier = cryptoFramework.createVerify(verifyAlg);
await verifier.init(pubKey);
await verifier.update({ data: new Uint8Array(buffer.from(deviceData, 'utf-8').buffer) });
return await verifier.verify(signature);
}
async function main() {
try {
let deviceId = "smartlight001";
let deviceData = "This is a sample device data for authentication.";
let signature = new Uint8Array([...]); // 假设设备发送的签名
let result = await authenticateDevice(deviceId, deviceData, signature);
if (result) {
console.info('Device authentication successful');
} else {
console.error('Device authentication failed');
}
} catch (error) {
console.error('Device authentication failed:', error);
}
}
main();
- 设备使用私钥对设备数据(如设备ID、设备状态等)进行签名,然后将签名和设备数据一起发送给认证服务器。认证服务器使用设备注册时存储的公钥对签名进行验证。如果验证成功,说明设备身份合法,可以接入智能家居网络。
选择SM4对称密钥算法对智能家居设备间传输的数据进行加密。SM4算法具有高效的加密和解密速度,适合在资源受限的智能家居设备上运行,同时能提供较高的数据机密性。
import { cryptoFramework } from '@kit.CryptoArchitectureKit';
// 设备A生成密钥对
async function generateDeviceAKeyPair() {
let keyAgreement = cryptoFramework.createKeyAgreement('ECC256');
return await keyAgreement.generateKeyPair();
}
// 设备B生成密钥对
async function generateDeviceBKeyPair() {
let keyAgreement = cryptoFramework.createKeyAgreement('ECC256');
return await keyAgreement.generateKeyPair();
}
// 密钥协商函数
async function keyAgreement(deviceAPrivateKey, deviceBPublicKey) {
let keyAgreement = cryptoFramework.createKeyAgreement('ECC256');
return await keyAgreement.doFinal(deviceAPrivateKey, deviceBPublicKey);
}
async function main() {
try {
let deviceAKeyPair = await generateDeviceAKeyPair();
let deviceBKeyPair = await generateDeviceBKeyPair();
let sharedKey = await keyAgreement(deviceAKeyPair.priKey, deviceBKeyPair.pubKey);
console.log('Shared key:', sharedKey);
} catch (error) {
console.error('Key agreement failed:', error);
}
}
main();
- 设备A和设备B分别生成自己的椭圆曲线密钥对,然后交换公钥。通过ECDH算法计算出共享密钥,用于后续的SM4算法加密数据。
2. 数据加密传输(SM4算法)
import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';
// 生成SM4对称密钥(这里使用前面协商得到的共享密钥)
async function generateSM4Key(sharedKey) {
let sm4Generator = cryptoFramework.createSymKeyGenerator('SM4_128');
let keyBlob = { data: new Uint8Array(sharedKey) };
return await sm4Generator.convertKey(keyBlob);
}
// 加密函数
async function encryptData(symKey, plainText) {
let cipher = cryptoFramework.createCipher('SM4_128|CBC|PKCS7');
let iv = new Uint8Array(16); // 生成16字节的随机IV
let params = {
iv: { data: iv }
};
await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, params);
let encryptData = await cipher.doFinal(plainText);
return encryptData;
}
// 解密函数
async function decryptData(symKey, cipherText, iv) {
let decoder = cryptoFramework.createCipher('SM4_128|CBC|PKCS7');
let params = {
iv: { data: iv }
};
await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, params);
return await decoder.doFinal(cipherText);
}
async function main() {
try {
// 假设已经通过密钥协商得到共享密钥
let sharedKey = new Uint8Array([...]);
let symKey = await generateSM4Key(sharedKey);
let message = "This is a test message for smart home device.";
let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
let encryptedData = await encryptData(symKey, plainText);
console.log('Encrypted data:', encryptedData);
// 解密(假设接收方收到密文后进行解密)
let iv = new Uint8Array(16); // 接收方使用相同的IV
let decryptedText = await decryptData(symKey, encryptedData, iv);
console.log('Decrypted data:', buffer.from(decryptedText.data).toString('utf-8'));
} catch (error) {
console.error('Encryption/Decryption failed:', error);
}
}
main();
- 设备使用协商得到的共享密钥生成SM4对称密钥,然后对数据进行加密传输。接收方使用相同的密钥和IV进行解密操作,确保数据的机密性和完整性。