Question

我尝试使用Mi Band 2连接和验证应用，但在最后一步（发送加密密钥并接收成功的身份验证响应）后，我收到错误响应。第一，第二和第三步是成功的，没有例外。以下是所有身份验证代码。

认证级别为1的主要认证方法（通知带有所需的触摸响应）
检查authCharacteristic的新更新并等待来自band的新响应。有2个，3个和4个级别的身份验证。

加密到AES / ECB / NoPadding加密（我也尝试过AesCbc，但结果相同）。

public async Task<bool> Authenticate()
{
    var authCharacteristic = await Gatt.GetCharacteristicByServiceUuid(new Guid("0000FEE1-0000-1000-8000-00805F9B34FB"), new Guid("00000009-0000-3512-2118-0009af100700"));
    // Subscribe to notifications
    await authCharacteristic.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);

    // Level 1
    Debug.WriteLine("Level 1 started");
    byte[] secretKey = new byte[] { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45 };
    List<byte> sendKey = new List<byte>();
    sendKey.Add(1);
    sendKey.Add(8);
    sendKey.AddRange(secretKey);

    if (await authCharacteristic.WriteValueAsync(sendKey.ToArray().AsBuffer()) == GattCommunicationStatus.Success)
    {
        Debug.WriteLine("Level 1 success");
        authCharacteristic.ValueChanged += authCharacteristic_ValueChanged;
    }

    return isAuthed;
}

private async void authCharacteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
{
    var authCharacteristic = await Gatt.GetCharacteristicByServiceUuid(new Guid("0000FEE1-0000-1000-8000-00805F9B34FB"), new Guid("00000009-0000-3512-2118-0009af100700"));

    if (sender.Uuid.ToString() == "00000009-0000-3512-2118-0009af100700")
    {
        Debug.WriteLine("Received characteristic value: " + args.CharacteristicValue.ToArray().ToList()[0]);
        Debug.WriteLine("Received SendKey: " + args.CharacteristicValue.ToArray().ToList()[1]);
        Debug.WriteLine("Received Status: " + args.CharacteristicValue.ToArray().ToList()[2]);

        var request = args.CharacteristicValue.ToArray().ToList();

        byte authResponse = 0x10;
        byte authSendKey = 0x01;
        byte authRequestRandomAuthNumber = 0x02;
        byte authRequestEncryptedKey = 0x03;
        byte authSuccess = 0x01;
        byte authFail = 0x04;

        if (request[0] == authResponse && request[1] == authSendKey && request[2] == authSuccess)
        {
            Debug.WriteLine("Level 2 started");
            List<byte> authNumber = new List<byte>();
            authNumber.Add(0x02);
            authNumber.Add(0x08);

            if (await authCharacteristic.WriteValueAsync(authNumber.ToArray().AsBuffer()) == GattCommunicationStatus.Success)
                Debug.WriteLine("Level 2 success");
        }
        else if (request[0] == authResponse && request[1] == authRequestRandomAuthNumber && request[2] == authSuccess)
        {
            Debug.WriteLine("Level 3 started");

            List<byte> randomKey = new List<byte>();
            List<byte> relevantResponsePart = new List<byte>();
            var responseValue = args.CharacteristicValue.ToArray();

            for (int i = 0; i < responseValue.Count(); i++)
            {
                if (i >= 3)
                    relevantResponsePart.Add(responseValue[i]);
            }

            randomKey.Add(0x03);
            randomKey.Add(0x08);
            randomKey.AddRange(Encrypt(relevantResponsePart.ToArray()));

            if (await authCharacteristic.WriteValueAsync(randomKey.ToArray().AsBuffer()) == GattCommunicationStatus.Success)
                Debug.WriteLine("Level 3 success");
        }
        else if (request[0] == authResponse && request[1] == authRequestEncryptedKey && request[2] == authSuccess)
        {
            // Can't reach this code. Last byte is 4 (error). 
            Debug.WriteLine("Auth completed");
            isAuthed = true;
        }
    }
}

public byte[] Encrypt(byte[] data)
{
    byte[] secretKey = new byte[] { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45 };
    string aesKey = Convert.ToBase64String(secretKey);
    IBuffer key = Convert.FromBase64String(aesKey).AsBuffer();
    SymmetricKeyAlgorithmProvider algorithmProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesEcb);
    CryptographicKey ckey = algorithmProvider.CreateSymmetricKey(key);

    IBuffer buffEncrypt = CryptographicEngine.Encrypt(ckey, data.AsBuffer(), null);
    return buffEncrypt.ToArray();
}

此处控制台中的所有调试消息：

Connected to MI Band 2
Level 1 started
Level 1 success
Received characteristic value: 16
Received SendKey: 1
Received Status: 1
Level 2 started
Level 2 success
Received characteristic value: 16
Received SendKey: 2
Received Status: 1
Level 3 started
Level 3 success
Received characteristic value: 16
Received SendKey: 3
Received Status: 4

Answer 1

当我在Encryption（）

中更改字符串时问题解决了

        byte[] secretKey = new byte[] { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45 };
        IBuffer key = secretKey.AsBuffer();

我认为我的问题出现在错误的加密代码中。

无法验证Mi Band 2

1 个答案: