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Mi Band 6 auth: add test, fix crypto

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This commit is contained in:
Andreas Shimokawa 2021-08-24 16:14:09 +02:00
parent d352624629
commit 2c06e5d39c
2 changed files with 48 additions and 6 deletions
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8
app/src/main/c/ecdh.c
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@ -767,6 +767,14 @@ int ecdh_shared_secret(const uint8_t* private_key, const uint8_t* others_pub, ui
output[i] = others_pub[i]; output[i] = others_pub[i];
} }
/* Clear bits > CURVE_DEGREE in highest word to satisfy constraint 1 <= exp < n. */
int nbits = bitvec_degree(base_order);
for (int i = (nbits - 1); i < (BITVEC_NWORDS * 32); ++i)
{
bitvec_clr_bit((uint32_t*)private_key, i);
}
/* Multiply other side's public key with own private key */ /* Multiply other side's public key with own private key */
gf2point_mul((uint32_t*)output,(uint32_t*)(output + BITVEC_NBYTES), (const uint32_t*)private_key); gf2point_mul((uint32_t*)output,(uint32_t*)(output + BITVEC_NBYTES), (const uint32_t*)private_key);

46
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/operations/InitOperation2021.java
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@ -19,7 +19,6 @@ package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations;
import android.annotation.SuppressLint; import android.annotation.SuppressLint;
import android.bluetooth.BluetoothGatt; import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic; import android.bluetooth.BluetoothGattCharacteristic;
import android.content.SharedPreferences;
import org.slf4j.Logger; import org.slf4j.Logger;
import org.slf4j.LoggerFactory; import org.slf4j.LoggerFactory;
@ -36,7 +35,6 @@ import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException; import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec; import javax.crypto.spec.SecretKeySpec;
import nodomain.freeyourgadget.gadgetbridge.GBApplication;
import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiService; import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiService;
import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice; import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder; import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
@ -45,12 +43,12 @@ import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiSupport;
import nodomain.freeyourgadget.gadgetbridge.util.GB; import nodomain.freeyourgadget.gadgetbridge.util.GB;
public class InitOperation2021 extends InitOperation { public class InitOperation2021 extends InitOperation {
private final byte[] privateEC = new byte[24]; private byte[] privateEC = new byte[24];
private byte[] publicEC; private byte[] publicEC;
private byte[] remotePublicEC = new byte[48]; private byte[] remotePublicEC = new byte[48];
private byte[] remoteRandom = new byte[16]; private final byte[] remoteRandom = new byte[16];
private byte[] sharedEC; private byte[] sharedEC;
private byte[] finalSharedSessionAES = new byte[16]; private final byte[] finalSharedSessionAES = new byte[16];
private final byte[] reassembleBuffer = new byte[512]; private final byte[] reassembleBuffer = new byte[512];
private int lastSequenceNumber = 0; private int lastSequenceNumber = 0;
@ -68,6 +66,23 @@ public class InitOperation2021 extends InitOperation {
super(needsAuth, authFlags, cryptFlags, support, builder); super(needsAuth, authFlags, cryptFlags, support, builder);
} }
private void testAuth() {
byte[] secretKey = getSecretKey();
privateEC = new byte[]{0x0b, 0x42, (byte) 0xb9, (byte) 0xe6, 0x1c, 0x23, 0x34, 0x0e, 0x35, (byte) 0xc1, 0x6e, 0x2e, 0x7d, (byte) 0xe4, 0x33, (byte) 0xf4, (byte) 0xb5, (byte) 0x85, (byte) 0x9a, 0x72, (byte) 0xec, 0x11, 0x40, 0x27};
remotePublicEC = new byte[]{(byte) 0xe6, 0x01, 0x6a, (byte) 0xba, 0x1d, (byte) 0xe7, (byte) 0xac, 0x0f, 0x0c, 0x7f, 0x0f, (byte) 0xf7, (byte) 0xe2, 0x24, 0x3e, 0x66, 0x62, (byte) 0xb5, (byte) 0xe0, 0x3b, 0x01, 0x00, 0x00, 0x00, (byte) 0xad, (byte) 0x8a, 0x4b, (byte) 0xed, (byte) 0xc7, 0x6a, 0x1e, (byte) 0xfd, (byte) 0xe7, 0x72, 0x5c, (byte) 0xc6, 0x62, (byte) 0xb5, 0x48, 0x35, 0x51, 0x3e, 0x3d, 0x57, 0x05, 0x00, 0x00, 0x00};
publicEC = ecdh_generate_public(privateEC);
sharedEC = ecdh_generate_shared(privateEC, remotePublicEC);
LOG.warn("publicEC: " + GB.hexdump(publicEC));
LOG.warn("privateEC: " + GB.hexdump(privateEC));
LOG.warn("remotepubEC: " + GB.hexdump(remotePublicEC));
LOG.warn("sharedEC: " + GB.hexdump(sharedEC));
for (int i = 0; i < 16; i++) {
finalSharedSessionAES[i] = (byte) (sharedEC[i + 8] ^ secretKey[i]);
}
LOG.warn("finalSharedAES: " + GB.hexdump(finalSharedSessionAES));
}
@Override @Override
protected void doPerform() { protected void doPerform() {
huamiSupport.enableNotifications(builder, true); huamiSupport.enableNotifications(builder, true);
@ -80,6 +95,7 @@ public class InitOperation2021 extends InitOperation {
sendPubkeyCommand[2] = 0x00; sendPubkeyCommand[2] = 0x00;
sendPubkeyCommand[3] = 0x02; sendPubkeyCommand[3] = 0x02;
System.arraycopy(publicEC, 0, sendPubkeyCommand, 4, 48); System.arraycopy(publicEC, 0, sendPubkeyCommand, 4, 48);
//testAuth();
huamiSupport.writeToChunked2021(builder, (short) 0x82, (byte) 0x66, sendPubkeyCommand); huamiSupport.writeToChunked2021(builder, (short) 0x82, (byte) 0x66, sendPubkeyCommand);
} }
@ -105,7 +121,6 @@ public class InitOperation2021 extends InitOperation {
UUID characteristicUUID = characteristic.getUuid(); UUID characteristicUUID = characteristic.getUuid();
if (HuamiService.UUID_CHARACTERISTIC_CHUNKEDTRANSFER_2021_READ.equals(characteristicUUID)) { if (HuamiService.UUID_CHARACTERISTIC_CHUNKEDTRANSFER_2021_READ.equals(characteristicUUID)) {
byte[] value = characteristic.getValue(); byte[] value = characteristic.getValue();
// 0x03 0x01 0x00 0x64 0x00 0x43 0x00 0x00 0x00 0x82 0x00 0x10 0x04 0x01 0x36 0x41 0xf2 0x5a 0x8f 0xb3
if (value.length > 1 && value[0] == 0x03) { if (value.length > 1 && value[0] == 0x03) {
int sequenceNumber = value[4]; int sequenceNumber = value[4];
int headerSize; int headerSize;
@ -120,6 +135,20 @@ public class InitOperation2021 extends InitOperation {
return false; return false;
} }
headerSize = 5; headerSize = 5;
} else if (value[9] == (byte) 0x82 && value[10] == 0x00 && value[11] == 0x10 && value[12] == 0x05 && value[13] == 0x01) {
try {
TransactionBuilder builder = createTransactionBuilder("Authenticated, now initialize phase 2");
builder.add(new SetDeviceStateAction(getDevice(), GBDevice.State.INITIALIZING, getContext()));
huamiSupport.enableFurtherNotifications(builder, true);
huamiSupport.requestDeviceInfo(builder);
huamiSupport.phase2Initialize(builder);
huamiSupport.phase3Initialize(builder);
huamiSupport.setInitialized(builder);
huamiSupport.performImmediately(builder);
} catch (Exception e) {
LOG.error("faild initializing device", e);
}
return true;
} else { } else {
LOG.info("Unhandled characteristic changed: " + characteristicUUID); LOG.info("Unhandled characteristic changed: " + characteristicUUID);
return super.onCharacteristicChanged(gatt, characteristic); return super.onCharacteristicChanged(gatt, characteristic);
@ -132,12 +161,17 @@ public class InitOperation2021 extends InitOperation {
lastSequenceNumber = sequenceNumber; lastSequenceNumber = sequenceNumber;
if (reassembleBuffer_pointer == reassembleBuffer_expectedBytes) { if (reassembleBuffer_pointer == reassembleBuffer_expectedBytes) {
System.arraycopy(reassembleBuffer, 0, remoteRandom, 0, 16); System.arraycopy(reassembleBuffer, 0, remoteRandom, 0, 16);
LOG.info("remoteRandom: " + GB.hexdump(remoteRandom));
System.arraycopy(reassembleBuffer, 16, remotePublicEC, 0, 48); System.arraycopy(reassembleBuffer, 16, remotePublicEC, 0, 48);
LOG.info("remotePublicEC: " + GB.hexdump(remotePublicEC));
sharedEC = ecdh_generate_shared(privateEC, remotePublicEC); sharedEC = ecdh_generate_shared(privateEC, remotePublicEC);
LOG.info("sharedEC: " + GB.hexdump(sharedEC));
byte[] secretKey = getSecretKey(); byte[] secretKey = getSecretKey();
for (int i = 0; i < 16; i++) { for (int i = 0; i < 16; i++) {
finalSharedSessionAES[i] = (byte) (sharedEC[i + 8] ^ secretKey[i]); finalSharedSessionAES[i] = (byte) (sharedEC[i + 8] ^ secretKey[i]);
} }
LOG.info("sharedSessionAES: " + GB.hexdump(finalSharedSessionAES));
try { try {
byte[] encryptedRandom1 = encryptAES(remoteRandom, secretKey); byte[] encryptedRandom1 = encryptAES(remoteRandom, secretKey);
byte[] encryptedRandom2 = encryptAES(remoteRandom, finalSharedSessionAES); byte[] encryptedRandom2 = encryptAES(remoteRandom, finalSharedSessionAES);