mirror of
https://codeberg.org/Freeyourgadget/Gadgetbridge
synced 2024-11-04 01:09:47 +01:00
Mi Band 4: Bring your own key support (blindly done, I dont have my key)
THIS STILL REQUIRES MI FIT AND YOUR EXTRACTED KEY HOWTO: 1) press + button in Gadgerbridge 2) LONG PRESS Mi Band 4 3) Tap "Auth Key" 4) Enter your key prefixed with 0x (eg. 0x112233445566778899aabbccddeeff00) 5) Go back 6) Tap Mi Band 4 Success? You tell me.
This commit is contained in:
Andreas Shimokawa
parent
be28da9430
commit
a60268c05c
@ -590,7 +590,7 @@ public class DiscoveryActivity extends AbstractGBActivity implements AdapterView
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DeviceCoordinator coordinator = DeviceHelper.getInstance().getCoordinator(deviceCandidate);
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GBDevice device = DeviceHelper.getInstance().toSupportedDevice(deviceCandidate);
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if (coordinator.getSupportedDeviceSpecificSettings(device) != null) {
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if (coordinator.getSupportedDeviceSpecificSettings(device) == null) {
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return true;
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}
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@ -209,15 +209,16 @@ public class HuamiSupport extends AbstractBTLEDeviceSupport {
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@Override
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protected TransactionBuilder initializeDevice(TransactionBuilder builder) {
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try {
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heartRateNotifyEnabled = false;
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boolean authenticate = needsAuth;
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needsAuth = false;
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byte authFlags = getAuthFlags();
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new InitOperation(authenticate, authFlags, this, builder).perform();
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byte cryptFlags = getCryptFlags();
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heartRateNotifyEnabled = false;
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boolean authenticate = needsAuth && (cryptFlags == 0x00);
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needsAuth = false;
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new InitOperation(authenticate, authFlags, cryptFlags, this, builder).perform();
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characteristicHRControlPoint = getCharacteristic(GattCharacteristic.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT);
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characteristicChunked = getCharacteristic(HuamiService.UUID_CHARACTERISTIC_CHUNKEDTRANSFER);
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} catch (IOException e) {
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GB.toast(getContext(), "Initializing Mi Band 2 failed", Toast.LENGTH_SHORT, GB.ERROR, e);
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GB.toast(getContext(), "Initializing Huami device failed", Toast.LENGTH_SHORT, GB.ERROR, e);
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}
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return builder;
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}
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@ -226,6 +227,10 @@ public class HuamiSupport extends AbstractBTLEDeviceSupport {
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return HuamiService.AUTH_BYTE;
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}
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public byte getCryptFlags() {
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return 0x00;
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}
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/**
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* Returns the given date/time (calendar) as a byte sequence, suitable for sending to the
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* Mi Band 2 (or derivative). The band appears to not handle DST offsets, so we simply add this
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@ -26,6 +26,11 @@ import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.miband3.MiBand
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public class MiBand4Support extends MiBand3Support {
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@Override
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public byte getCryptFlags() {
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return (byte) 0x80;
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}
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@Override
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public HuamiFWHelper createFWHelper(Uri uri, Context context) throws IOException {
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return null;
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@ -16,6 +16,7 @@
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations;
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import android.annotation.SuppressLint;
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import android.bluetooth.BluetoothGatt;
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import android.bluetooth.BluetoothGattCharacteristic;
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import android.content.SharedPreferences;
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@ -24,9 +25,7 @@ import android.widget.Toast;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.IOException;
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import java.security.InvalidKeyException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Arrays;
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import java.util.UUID;
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@ -52,21 +51,25 @@ public class InitOperation extends AbstractBTLEOperation<HuamiSupport> {
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private final TransactionBuilder builder;
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private final boolean needsAuth;
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private final byte authFlags;
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private final byte cryptFlags;
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private final HuamiSupport huamiSupport;
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public InitOperation(boolean needsAuth, byte authFlags, HuamiSupport support, TransactionBuilder builder) {
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public InitOperation(boolean needsAuth, byte authFlags, byte cryptFlags, HuamiSupport support, TransactionBuilder builder) {
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super(support);
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this.huamiSupport = support;
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this.needsAuth = needsAuth;
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this.authFlags = authFlags;
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this.cryptFlags = cryptFlags;
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this.builder = builder;
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builder.setGattCallback(this);
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}
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@Override
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protected void doPerform() throws IOException {
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getSupport().enableNotifications(builder, true);
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protected void doPerform() {
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huamiSupport.enableNotifications(builder, true);
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if (needsAuth) {
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builder.add(new SetDeviceStateAction(getDevice(), GBDevice.State.AUTHENTICATING, getContext()));
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// write key to miband2
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// write key to device
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byte[] sendKey = org.apache.commons.lang3.ArrayUtils.addAll(new byte[]{HuamiService.AUTH_SEND_KEY, authFlags}, getSecretKey());
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builder.write(getCharacteristic(HuamiService.UUID_CHARACTERISTIC_AUTH), sendKey);
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} else {
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@ -77,7 +80,11 @@ public class InitOperation extends AbstractBTLEOperation<HuamiSupport> {
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}
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private byte[] requestAuthNumber() {
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if (cryptFlags == 0x00) {
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return new byte[]{HuamiService.AUTH_REQUEST_RANDOM_AUTH_NUMBER, authFlags};
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} else {
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return new byte[]{(byte) (cryptFlags | HuamiService.AUTH_REQUEST_RANDOM_AUTH_NUMBER), authFlags, 0x02};
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}
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}
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private byte[] getSecretKey() {
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@ -88,13 +95,17 @@ public class InitOperation extends AbstractBTLEOperation<HuamiSupport> {
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String authKey = sharedPrefs.getString("authkey", null);
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if (authKey != null && !authKey.isEmpty()) {
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byte[] srcBytes = authKey.getBytes();
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if (authKey.length() == 34 && authKey.substring(0, 2).equals("0x")) {
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srcBytes = GB.hexStringToByteArray(authKey.substring(2));
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}
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System.arraycopy(srcBytes, 0, authKeyBytes, 0, Math.min(srcBytes.length, 16));
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}
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return authKeyBytes;
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}
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@Override
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public TransactionBuilder performInitialized(String taskName) throws IOException {
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public TransactionBuilder performInitialized(String taskName) {
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throw new UnsupportedOperationException("This IS the initialization class, you cannot call this method");
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}
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@ -105,41 +116,40 @@ public class InitOperation extends AbstractBTLEOperation<HuamiSupport> {
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if (HuamiService.UUID_CHARACTERISTIC_AUTH.equals(characteristicUUID)) {
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try {
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byte[] value = characteristic.getValue();
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getSupport().logMessageContent(value);
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huamiSupport.logMessageContent(value);
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if (value[0] == HuamiService.AUTH_RESPONSE &&
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value[1] == HuamiService.AUTH_SEND_KEY &&
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value[2] == HuamiService.AUTH_SUCCESS) {
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TransactionBuilder builder = createTransactionBuilder("Sending the secret key to the band");
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TransactionBuilder builder = createTransactionBuilder("Sending the secret key to the device");
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builder.write(characteristic, requestAuthNumber());
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getSupport().performImmediately(builder);
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huamiSupport.performImmediately(builder);
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} else if (value[0] == HuamiService.AUTH_RESPONSE &&
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value[1] == HuamiService.AUTH_REQUEST_RANDOM_AUTH_NUMBER &&
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(value[1] & 0x0f) == HuamiService.AUTH_REQUEST_RANDOM_AUTH_NUMBER &&
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value[2] == HuamiService.AUTH_SUCCESS) {
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// md5??
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byte[] eValue = handleAESAuth(value, getSecretKey());
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byte[] responseValue = org.apache.commons.lang3.ArrayUtils.addAll(
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new byte[]{HuamiService.AUTH_SEND_ENCRYPTED_AUTH_NUMBER, authFlags}, eValue);
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new byte[]{(byte) (HuamiService.AUTH_SEND_ENCRYPTED_AUTH_NUMBER | cryptFlags), authFlags}, eValue);
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TransactionBuilder builder = createTransactionBuilder("Sending the encrypted random key to the band");
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TransactionBuilder builder = createTransactionBuilder("Sending the encrypted random key to the device");
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builder.write(characteristic, responseValue);
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getSupport().setCurrentTimeWithService(builder);
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getSupport().performImmediately(builder);
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huamiSupport.setCurrentTimeWithService(builder);
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huamiSupport.performImmediately(builder);
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} else if (value[0] == HuamiService.AUTH_RESPONSE &&
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value[1] == HuamiService.AUTH_SEND_ENCRYPTED_AUTH_NUMBER &&
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(value[1] & 0x0f) == HuamiService.AUTH_SEND_ENCRYPTED_AUTH_NUMBER &&
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value[2] == HuamiService.AUTH_SUCCESS) {
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TransactionBuilder builder = createTransactionBuilder("Authenticated, now initialize phase 2");
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builder.add(new SetDeviceStateAction(getDevice(), GBDevice.State.INITIALIZING, getContext()));
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getSupport().requestDeviceInfo(builder);
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getSupport().enableFurtherNotifications(builder, true);
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getSupport().phase2Initialize(builder);
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getSupport().phase3Initialize(builder);
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getSupport().setInitialized(builder);
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getSupport().performImmediately(builder);
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huamiSupport.requestDeviceInfo(builder);
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huamiSupport.enableFurtherNotifications(builder, true);
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huamiSupport.phase2Initialize(builder);
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huamiSupport.phase3Initialize(builder);
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huamiSupport.setInitialized(builder);
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huamiSupport.performImmediately(builder);
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} else {
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return super.onCharacteristicChanged(gatt, characteristic);
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}
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} catch (Exception e) {
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GB.toast(getContext(), "Error authenticating Mi Band 2", Toast.LENGTH_LONG, GB.ERROR, e);
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GB.toast(getContext(), "Error authenticating Huami device", Toast.LENGTH_LONG, GB.ERROR, e);
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}
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return true;
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} else {
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@ -148,17 +158,11 @@ public class InitOperation extends AbstractBTLEOperation<HuamiSupport> {
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}
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}
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private byte[] getMD5(byte[] message) throws NoSuchAlgorithmException {
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MessageDigest md5 = MessageDigest.getInstance("MD5");
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return md5.digest(message);
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}
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private byte[] handleAESAuth(byte[] value, byte[] secretKey) throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException {
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byte[] mValue = Arrays.copyOfRange(value, 3, 19);
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Cipher ecipher = Cipher.getInstance("AES/ECB/NoPadding");
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@SuppressLint("GetInstance") Cipher ecipher = Cipher.getInstance("AES/ECB/NoPadding");
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SecretKeySpec newKey = new SecretKeySpec(secretKey, "AES");
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ecipher.init(Cipher.ENCRYPT_MODE, newKey);
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byte[] enc = ecipher.doFinal(mValue);
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return enc;
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return ecipher.doFinal(mValue);
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}
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}
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@ -194,6 +194,16 @@ public class GB {
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return new String(hexChars);
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}
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public static byte[] hexStringToByteArray(String s) {
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int len = s.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
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+ Character.digit(s.charAt(i+1), 16));
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}
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return data;
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}
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public static String formatRssi(short rssi) {
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return String.valueOf(rssi);
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}
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