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[Huawei] Add HiChainLite firstKey handling

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This commit is contained in:
Damien 'Psolyca' Gaignon 2024-02-05 19:09:55 +01:00
parent 270212a771
commit 05c11cbd14
No known key found for this signature in database
GPG Key ID: 9E9404E5D9E11843
3 changed files with 39 additions and 6 deletions
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24
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huawei/HuaweiCrypto.java
View File

@ -119,7 +119,11 @@ public class HuaweiCrypto {
.put(message)
.array();
byte[] digestStep1 = CryptoUtils.calcHmacSha256(msgToDigest, nonce);
return CryptoUtils.calcHmacSha256(digestStep1, nonce);
byte[] challenge = ByteBuffer.allocate(0x40)
.put(CryptoUtils.calcHmacSha256(digestStep1, nonce))
.put(digestStep1)
.array();
return challenge;
}
public byte[] computeDigestHiChainLite(byte[] message, byte[] key, byte[] nonce) throws NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException, UnsupportedEncodingException {
@ -138,7 +142,11 @@ public class HuaweiCrypto {
} else {
digestStep1 = CryptoUtils.calcHmacSha256(msgToDigest, nonce);
}
return CryptoUtils.calcHmacSha256(digestStep1, nonce);
byte[] challenge = ByteBuffer.allocate(0x40)
.put(CryptoUtils.calcHmacSha256(digestStep1, nonce))
.put(digestStep1)
.array();
return challenge;
}
public byte[] digestChallenge(byte[] secretKey, byte[] nonce) throws NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException, UnsupportedEncodingException {
@ -150,7 +158,11 @@ public class HuaweiCrypto {
.put(secretKey)
.put(MESSAGE_CHALLENGE)
.array();
return CryptoUtils.calcHmacSha256(key, nonce);
byte[] challenge = ByteBuffer.allocate(0x40)
.put(CryptoUtils.calcHmacSha256(key, nonce))
.put(key)
.array();
return challenge;
}
return computeDigestHiChainLite(MESSAGE_CHALLENGE, secretKey, nonce);
}
@ -166,7 +178,11 @@ public class HuaweiCrypto {
.put(secretKey)
.put(MESSAGE_RESPONSE)
.array();
return CryptoUtils.calcHmacSha256(key, nonce);
byte[] challenge = ByteBuffer.allocate(0x40)
.put(CryptoUtils.calcHmacSha256(key, nonce))
.put(key)
.array();
return challenge;
}
return computeDigestHiChainLite(MESSAGE_RESPONSE, secretKey, nonce);
}

9
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huawei/HuaweiPacket.java
View File

@ -58,6 +58,7 @@ public class HuaweiPacket {
protected byte interval;
protected byte authAlgo;
protected byte encryptMethod;
protected byte[] firstKey;
public void setAuthVersion(byte authVersion) {
this.authVersion = authVersion;
@ -153,6 +154,14 @@ public class HuaweiPacket {
public byte getEncryptMethod () {
return this.encryptMethod;
}
public void setFirstKey(byte[] firstKey) {
this.firstKey = firstKey;
}
public byte[] getFirstKey() {
return firstKey;
}
}
public static abstract class ParseException extends Exception {

12
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/requests/GetAuthRequest.java
View File

@ -74,8 +74,13 @@ public class GetAuthRequest extends Request {
.putShort(authVersion)
.put(clientNonce)
.array();
byte[] challenge = huaweiCrypto.digestChallenge(key, doubleNonce);
ByteBuffer digestedChallenge = ByteBuffer.wrap(huaweiCrypto.digestChallenge(key, doubleNonce));
byte[] challenge = new byte[0x20];
digestedChallenge.get(challenge, 0x00, 0x20);
LOG.debug("challenge: " + GB.hexdump(challenge));
byte[] firstKey = new byte[0x10];
digestedChallenge.get(firstKey, 0x00, 0x10);
paramsProvider.setFirstKey(firstKey);
if (challenge == null)
throw new RequestCreationException("Challenge null");
return new DeviceConfig.Auth.Request(paramsProvider, challenge, nonce).serialize();
@ -94,7 +99,10 @@ public class GetAuthRequest extends Request {
throw new ResponseTypeMismatchException(receivedPacket, DeviceConfig.Auth.Response.class);
try {
byte[] expectedAnswer = huaweiCrypto.digestResponse(key, doubleNonce);
ByteBuffer digestedChallenge = ByteBuffer.wrap(huaweiCrypto.digestResponse(key, doubleNonce));
byte[] expectedAnswer = new byte[0x20];
digestedChallenge.get(expectedAnswer, 0x00, 0x20);
LOG.debug("challenge: " + GB.hexdump(expectedAnswer));
if (expectedAnswer == null)
throw new ResponseParseException("Challenge null");
byte[] actualAnswer = ((DeviceConfig.Auth.Response) receivedPacket).challengeResponse;