public override CommandResult Execute()
{
var datagrams = Pcap.ReadFile(PcapFile).
TrySelect(record =>
Tx.Network.PacketParser.Parse(record.Data.Skip(14).ToArray())).
Where(p => p != null).
Where(p => p.ProtocolType == ProtocolType.Udp).
Select(p => p.ToUdpDatagram()).
Where(p => p.UdpDatagramHeader.SourcePort == Port ||
p.UdpDatagramHeader.DestinationPort == Port).
ToArray();
var cryptoBlob = SharedSecret.HexToBytes();
var decryptor = new MessageAnalyzer(cryptoBlob);
foreach (var datagram in datagrams)
{
var messageInfo = decryptor.ReadMessage(datagram.UdpData.ToArray());
Console.WriteLine($"From: {datagram.UdpDatagramHeader.SourcePort}, To: {datagram.UdpDatagramHeader.DestinationPort}");
Console.WriteLine($"Message Type: {messageInfo.MessageType}");
Console.WriteLine($"Request Ack: {messageInfo.RequestAcknowledge}");
Console.WriteLine($"Version: {messageInfo.Version}");
Console.WriteLine($"ChannelId: {messageInfo.ChannelId}");
if (!String.IsNullOrEmpty(messageInfo.Json))
{
Console.WriteLine($"Json: {messageInfo.Json}");
}
else
{
Console.WriteLine($"Binary: {messageInfo.Data.ToHex()}");
}
Console.WriteLine();
}
return(CommandResult.Success);
}
public static void BitMaskedAgree(string privateKey, string publicKey, string sharedSecret)
{
var a = KeyAgreementAlgorithm.X25519;
var kdf = KeyDerivationAlgorithm.HkdfSha256;
var pk1 = publicKey.DecodeHex();
var pk2 = publicKey.DecodeHex();
pk1[pk1.Length - 1] &= 0x7F;
pk2[pk2.Length - 1] |= 0x80;
using var k = Key.Import(a, privateKey.DecodeHex(), KeyBlobFormat.RawPrivateKey);
using var sharedSecretExpected = SharedSecret.Import(sharedSecret.DecodeHex());
using var sharedSecretActual1 = a.Agree(k, PublicKey.Import(a, pk1, KeyBlobFormat.RawPublicKey)) ?? throw new Xunit.Sdk.NotNullException();
using var sharedSecretActual2 = a.Agree(k, PublicKey.Import(a, pk2, KeyBlobFormat.RawPublicKey)) ?? throw new Xunit.Sdk.NotNullException();
var expected = kdf.Extract(sharedSecretExpected, ReadOnlySpan <byte> .Empty);
var actual1 = kdf.Extract(sharedSecretActual1, ReadOnlySpan <byte> .Empty);
var actual2 = kdf.Extract(sharedSecretActual2, ReadOnlySpan <byte> .Empty);
Assert.Equal(expected, actual1);
Assert.Equal(expected, actual2);
}
public byte[] decrypt(byte[] data)
{
SharedSecret secret = SharedSecret.Import(motherKey);
byte[] seconds = new byte[4];
Array.Copy(data, 0, seconds, 0, 4);
Console.WriteLine("Seconds size: " + seconds.Length);
Console.WriteLine("Seconds: " + BitConverter.ToInt32(seconds));
byte[] IV = new byte[12];
Array.Copy(data, 4, IV, 0, 12);
Console.WriteLine("IV size: " + IV.Length);
Console.WriteLine("IV: " + BitConverter.ToString(IV));
byte[] ciphertext = new byte[data.Length - 16];
Array.Copy(data, 16, ciphertext, 0, ciphertext.Length);
Console.WriteLine("Ciphertext size: " + ciphertext.Length);
Console.WriteLine("Ciphertext: " + BitConverter.ToString(ciphertext));
Key keyCipher = KeyDerivationAlgorithm.HkdfSha256.DeriveKey(secret, seconds, null, ChaCha20Poly1305.ChaCha20Poly1305);
byte[] plaintext = new byte[ciphertext.Length - ChaCha20Poly1305.ChaCha20Poly1305.TagSize];
bool decrypt = ChaCha20Poly1305.ChaCha20Poly1305.Decrypt(keyCipher, new Nonce(IV, 0), null, ciphertext, plaintext);
if (decrypt)
{
Console.WriteLine("Decryption successful, plaintext: " + BitConverter.ToString(plaintext));
return(plaintext);
}
else
{
Console.WriteLine("Decryption unsuccessful");
return(null);
}
}
public static void BitMaskedAgree(string privateKey, string publicKey, string sharedSecret)
{
var a = new X25519();
var kdf = new HkdfSha256();
var pk1 = publicKey.DecodeHex();
var pk2 = publicKey.DecodeHex();
pk1[pk1.Length - 1] &= 0x7F;
pk2[pk2.Length - 1] |= 0x80;
using (var k = Key.Import(a, privateKey.DecodeHex(), KeyBlobFormat.RawPrivateKey))
using (var sharedSecretExpected = SharedSecret.Import(sharedSecret.DecodeHex()))
using (var sharedSecretActual1 = a.Agree(k, PublicKey.Import(a, pk1, KeyBlobFormat.RawPublicKey)))
using (var sharedSecretActual2 = a.Agree(k, PublicKey.Import(a, pk2, KeyBlobFormat.RawPublicKey)))
{
var expected = kdf.Extract(sharedSecretExpected, ReadOnlySpan <byte> .Empty);
var actual1 = kdf.Extract(sharedSecretActual1, ReadOnlySpan <byte> .Empty);
var actual2 = kdf.Extract(sharedSecretActual2, ReadOnlySpan <byte> .Empty);
Assert.Equal(expected, actual1);
Assert.Equal(expected, actual2);
}
}
internal Tlv HandlePairSetupM5Raw(ConnectionSession session, out KeyPair keyPair)
{
var hdkf = new HkdfSha512();
var accessory = hdkf.DeriveBytes(
SharedSecret.Import(SrpInteger.FromHex(session.ServerSession.Key).ToByteArray()),
Encoding.UTF8.GetBytes("Pair-Setup-Accessory-Sign-Salt"),
Encoding.UTF8.GetBytes("Pair-Setup-Accessory-Sign-Info"), 32);
keyPair = KeyGenerator.GenerateNewPair();
var serverUsername = Encoding.UTF8.GetBytes(HapControllerServer.HapControllerId);
var material = accessory.Concat(serverUsername).Concat(keyPair.PublicKey).ToArray();
var signature = Chaos.NaCl.Ed25519.Sign(material, keyPair.PrivateKey);
var encoder = new Tlv();
encoder.AddType(Constants.Identifier, serverUsername);
encoder.AddType(Constants.PublicKey, keyPair.PublicKey);
encoder.AddType(Constants.Signature, signature);
return(encoder);
}
public PairSetupReturn Post(Tlv parts)
{
var customParams = SrpParameters.Create3072 <SHA512>();
var state = parts.GetTypeAsInt(Constants.State);
if (state == 1) //srp sign up
{
var rnd = new Random();
_salt = new byte[16];
rnd.NextBytes(_salt);
_saltInt = SrpInteger.FromByteArray(_salt);
var srp = new SrpClient(customParams);
_privateKey = srp.DerivePrivateKey(_saltInt.ToHex(), Username, _code);
_verifier = srp.DeriveVerifier(_privateKey);
_server = new SrpServer(customParams);
_serverEphemeral = _server.GenerateEphemeral(_verifier);
var responseTlv = new Tlv();
responseTlv.AddType(Constants.State, 2);
responseTlv.AddType(Constants.PublicKey, StringToByteArray(_serverEphemeral.Public));
responseTlv.AddType(Constants.Salt, _salt);
return(new PairSetupReturn
{
State = 1,
TlvData = responseTlv,
Ok = true
});
}
if (state == 3) //srp authenticate
{
_logger.LogDebug("Pair Setup Step 3/6");
_logger.LogDebug("SRP Verify Request");
var pubKey = parts.GetType(Constants.PublicKey);
var proof = parts.GetType(Constants.Proof);
var iOsPublicKey = SrpInteger.FromByteArray(pubKey);
var iOsProof = SrpInteger.FromByteArray(proof);
var responseTlv = new Tlv();
responseTlv.AddType(Constants.State, 4);
var ok = true;
try
{
_serverSession = _server.DeriveSession(_serverEphemeral.Secret, iOsPublicKey.ToHex(), _saltInt.ToHex(), Username, _verifier,
iOsProof.ToHex());
_logger.LogInformation("Verification was successful. Generating Server Proof (M2)");
responseTlv.AddType(Constants.Proof, StringToByteArray(_serverSession.Proof));
}
catch (Exception)
{
ok = false;
_logger.LogError("Verification failed as iOS provided code was incorrect");
responseTlv.AddType(Constants.Error, ErrorCodes.Authentication);
}
return(new PairSetupReturn
{
State = 3,
Ok = ok,
TlvData = responseTlv
});
}
if (state == 5)
{
_logger.LogDebug("Pair Setup Step 5/6");
_logger.LogDebug("Exchange Response");
try
{
var iOsEncryptedData = parts.GetType(Constants.EncryptedData).AsSpan(); // A
var zeros = new byte[] { 0, 0, 0, 0 };
var nonce = new Nonce(zeros, Encoding.UTF8.GetBytes("PS-Msg05"));
var hdkf = new HkdfSha512();
var hkdfEncKey = hdkf.DeriveBytes(
SharedSecret.Import(SrpInteger.FromHex(_serverSession.Key).ToByteArray()),
Encoding.UTF8.GetBytes("Pair-Setup-Encrypt-Salt"),
Encoding.UTF8.GetBytes("Pair-Setup-Encrypt-Info"), 32);
var decrypt = AeadAlgorithm.ChaCha20Poly1305.Decrypt(
Key.Import(AeadAlgorithm.ChaCha20Poly1305, hkdfEncKey, KeyBlobFormat.RawSymmetricKey), nonce,
new byte[0], iOsEncryptedData, out var output);
var responseTlv = new Tlv();
responseTlv.AddType(Constants.State, 6);
if (!decrypt)
{
responseTlv.AddType(Constants.Error, ErrorCodes.Authentication);
return(new PairSetupReturn
{
State = 5,
TlvData = responseTlv,
Ok = false
});
}
var subData = TlvParser.Parse(output);
byte[] username = subData.GetType(Constants.Identifier);
byte[] ltpk = subData.GetType(Constants.PublicKey);
byte[] proof = subData.GetType(Constants.Signature);
var okm = hdkf.DeriveBytes(
SharedSecret.Import(SrpInteger.FromHex(_serverSession.Key).ToByteArray()),
Encoding.UTF8.GetBytes("Pair-Setup-Controller-Sign-Salt"),
Encoding.UTF8.GetBytes("Pair-Setup-Controller-Sign-Info"), 32);
var completeData = okm.Concat(username).Concat(ltpk).ToArray();
if (!SignatureAlgorithm.Ed25519.Verify(
PublicKey.Import(SignatureAlgorithm.Ed25519, ltpk, KeyBlobFormat.RawPublicKey), completeData,
proof))
{
var errorTlv = new Tlv();
errorTlv.AddType(Constants.Error, ErrorCodes.Authentication);
return(new PairSetupReturn
{
State = 5,
TlvData = errorTlv,
Ok = false
});
}
var accessory = hdkf.DeriveBytes(
SharedSecret.Import(SrpInteger.FromHex(_serverSession.Key).ToByteArray()),
Encoding.UTF8.GetBytes("Pair-Setup-Accessory-Sign-Salt"),
Encoding.UTF8.GetBytes("Pair-Setup-Accessory-Sign-Info"), 32);
var seed = new byte[32];
RandomNumberGenerator.Create().GetBytes(seed);
Chaos.NaCl.Ed25519.KeyPairFromSeed(out var accessoryLtpk, out var accessoryLtsk, seed);
var serverUsername = Encoding.UTF8.GetBytes(HapControllerServer.HapControllerId);
var material = accessory.Concat(serverUsername).Concat(accessoryLtpk).ToArray();
var signature = Chaos.NaCl.Ed25519.Sign(material, accessoryLtsk);
var encoder = new Tlv();
encoder.AddType(Constants.Identifier, serverUsername);
encoder.AddType(Constants.PublicKey, accessoryLtpk);
encoder.AddType(Constants.Signature, signature);
var plaintext = TlvParser.Serialise(encoder);
var nonce6 = new Nonce(zeros, Encoding.UTF8.GetBytes("PS-Msg06"));
var encryptedOutput = AeadAlgorithm.ChaCha20Poly1305.Encrypt(
Key.Import(AeadAlgorithm.ChaCha20Poly1305, hkdfEncKey, KeyBlobFormat.RawSymmetricKey), nonce6,
new byte[0], plaintext);
responseTlv.AddType(Constants.EncryptedData, encryptedOutput);
return(new PairSetupReturn
{
State = 5,
TlvData = responseTlv,
Ok = true,
Ltsk = ByteArrayToString(accessoryLtsk),
Ltpk = ByteArrayToString(ltpk)
});
}
catch (Exception e)
{
_logger.LogError(e, "Could not exchange request");
throw;
}
}
return(null);
}
public static void ImportTooLong()
{
var b = new byte[129];
Assert.Throws <ArgumentException>("sharedSecret", () => SharedSecret.Import(b));
}
internal async Task <Guid> AddFromUrlAsync(string projectName, string @event, EventFilters filters, Uri targetUrl, string ruleName, bool impersonateExecution, CancellationToken cancellationToken)
{
async Task <(Uri, string)> RetrieveHostedUrl(string _ruleName, CancellationToken _cancellationToken)
{
string apiKey = MagicConstants.InvalidApiKey;
logger.WriteVerbose($"Validating target URL {targetUrl.AbsoluteUri}");
string userManagedPassword = Environment.GetEnvironmentVariable(MagicConstants.EnvironmentVariable_SharedSecret);
if (string.IsNullOrEmpty(userManagedPassword))
{
throw new ApplicationException($"{MagicConstants.EnvironmentVariable_SharedSecret} environment variable is required for this command");
}
string proof = SharedSecret.DeriveFromPassword(userManagedPassword);
var configUrl = new UriBuilder(targetUrl);
configUrl.Path += $"config/key";
var handler = new HttpClientHandler()
{
SslProtocols = SslProtocols.Tls12,// | SslProtocols.Tls11 | SslProtocols.Tls,
ServerCertificateCustomValidationCallback = delegate { return(true); }
};
using (var client = new HttpClient(handler))
using (var request = new HttpRequestMessage(HttpMethod.Post, configUrl.Uri))
{
using (request.Content = new StringContent($"\"{proof}\"", Encoding.UTF8, "application/json"))
using (var response = await client.SendAsync(request, cancellationToken))
{
switch (response.StatusCode)
{
case HttpStatusCode.OK:
logger.WriteVerbose($"Connection to {targetUrl} succeded");
apiKey = await response.Content.ReadAsStringAsync();
logger.WriteInfo($"Configuration retrieved.");
break;
default:
logger.WriteError($"{targetUrl} returned {response.ReasonPhrase}.");
break;
}//switch
}
}
if (string.IsNullOrEmpty(apiKey) || apiKey == MagicConstants.InvalidApiKey)
{
throw new ApplicationException("Unable to retrieve API Key, please check Shared secret configuration");
}
var b = new UriBuilder(targetUrl);
b.Path += $"workitem/{_ruleName}";
return(b.Uri, apiKey);
}
return(await CoreAddAsync(projectName, @event, filters, ruleName, impersonateExecution, RetrieveHostedUrl, MagicConstants.ApiKeyAuthenticationHeaderName, cancellationToken));
}
public PairVerifyReturn Post(Tlv parts, HapSession session)
{
var state = parts.GetTypeAsInt(Constants.State);
if (state == 1)
{
_logger.LogDebug("* Pair Verify Step 1/4");
_logger.LogDebug("* Verify Start Request");
var clientPublicKey = parts.GetType(Constants.PublicKey);
byte[] privateKey = new byte[32];
Random random = new Random();
random.NextBytes(privateKey);
var publicKey = Curve25519.GetPublicKey(privateKey);
var sharedSecret = Curve25519.GetSharedSecret(privateKey, clientPublicKey);
var serverUsername = Encoding.UTF8.GetBytes(HapControllerServer.HapControllerId);
var material = publicKey.Concat(serverUsername).Concat(clientPublicKey).ToArray();
var accessoryLtsk = StringToByteArray(HapControllerServer.HapControllerLtsk);
var proof = Chaos.NaCl.Ed25519.Sign(material, accessoryLtsk);
var hdkf = new HkdfSha512();
var hkdfEncKey = hdkf.DeriveBytes(SharedSecret.Import(sharedSecret), Encoding.UTF8.GetBytes("Pair-Verify-Encrypt-Salt"),
Encoding.UTF8.GetBytes("Pair-Verify-Encrypt-Info"), 32);
var encoder = new Tlv();
encoder.AddType(Constants.Identifier, serverUsername);
encoder.AddType(Constants.Signature, proof);
var plaintext = TlvParser.Serialize(encoder);
var zeros = new byte[] { 0, 0, 0, 0 };
var nonce = new Nonce(zeros, Encoding.UTF8.GetBytes("PV-Msg02"));
var encryptedOutput = AeadAlgorithm.ChaCha20Poly1305.Encrypt(
Key.Import(AeadAlgorithm.ChaCha20Poly1305, hkdfEncKey, KeyBlobFormat.RawSymmetricKey), nonce,
new byte[0], plaintext);
var responseTlv = new Tlv();
responseTlv.AddType(Constants.State, 2);
responseTlv.AddType(Constants.EncryptedData, encryptedOutput);
responseTlv.AddType(Constants.PublicKey, publicKey);
// Store the details on the session.
//
session.ClientPublicKey = clientPublicKey;
session.PrivateKey = privateKey;
session.PublicKey = publicKey;
session.SharedSecret = sharedSecret;
session.HkdfPairEncKey = hkdfEncKey;
var encSalt = Encoding.UTF8.GetBytes("Control-Salt");
var infoRead = Encoding.UTF8.GetBytes("Control-Read-Encryption-Key");
var infoWrite = Encoding.UTF8.GetBytes("Control-Write-Encryption-Key");
session.AccessoryToControllerKey = hdkf.DeriveBytes(SharedSecret.Import(sharedSecret), encSalt, infoRead, 32);
session.ControllerToAccessoryKey = hdkf.DeriveBytes(SharedSecret.Import(sharedSecret), encSalt, infoWrite, 32);
return(new PairVerifyReturn
{
TlvData = responseTlv,
Ok = true,
HapSession = session
});
}
if (state == 3)
{
_logger.LogDebug("* Pair Verify Step 3/4");
_logger.LogDebug("* Verify Finish Request");
var encryptedData = parts.GetType(Constants.EncryptedData);
var zeros = new byte[] { 0, 0, 0, 0 };
var nonce = new Nonce(zeros, Encoding.UTF8.GetBytes("PV-Msg03"));
var decrypt = AeadAlgorithm.ChaCha20Poly1305.Decrypt(Key.Import(AeadAlgorithm.ChaCha20Poly1305, session.HkdfPairEncKey, KeyBlobFormat.RawSymmetricKey), nonce, new byte[0], encryptedData, out var output);
if (!decrypt)
{
var errorTlv = new Tlv();
errorTlv.AddType(Constants.State, 4);
errorTlv.AddType(Constants.Error, ErrorCodes.Authentication);
return(new PairVerifyReturn
{
TlvData = errorTlv,
Ok = false
});
}
var subData = TlvParser.Parse(output);
var clientUserName = subData.GetType(Constants.Identifier);
var signature = subData.GetType(Constants.Signature);
var clientPublicKey = StringToByteArray(HapControllerServer.HapControllerLtpk);
var material = session.ClientPublicKey.Concat(clientUserName).Concat(session.PublicKey).ToArray();
session.ClientUsername = Automatica.Core.Driver.Utility.Utils.ByteArrayToString(in clientUserName);
if (!Chaos.NaCl.Ed25519.Verify(signature, material, clientPublicKey))
{
var errorTlv = new Tlv();
errorTlv.AddType(Constants.State, 4);
errorTlv.AddType(Constants.Error, ErrorCodes.Authentication);
return(new PairVerifyReturn
{
TlvData = errorTlv,
Ok = false
});
}
var responseTlv = new Tlv();
responseTlv.AddType(Constants.State, 4);
session.IsVerified = true;
session.SkipFirstEncryption = true;
return(new PairVerifyReturn
{
Ok = true,
TlvData = responseTlv
});
}
return(null);
}
public static void ImportEmpty()
{
using var s = SharedSecret.Import(ReadOnlySpan <byte> .Empty);
Assert.NotNull(s);
Assert.Equal(0, s.Size);
}
static void Main(string[] args)
{
Channel channel = new Channel("ac.testnet.libra.org:8000", ChannelCredentials.Insecure);
var client = new AdmissionControl.AdmissionControl.AdmissionControlClient(channel);
HexEncoder hex = new HexEncoder();
SharedSecret sharedSecret = SharedSecret.Import(Encoding.UTF8.GetBytes("newdummy"));
HkdfSha512 kdf = new HkdfSha512();
var key = kdf.DeriveKey(sharedSecret, null, null, Ed25519.Ed25519);
var sender = key.PublicKey.Export(KeyBlobFormat.RawPublicKey);
UInt64 seqNum = 11;
string senderHex = hex.EncodeData(Sha3.Sha3256().ComputeHash(sender));
uint amount = 10000000;
string reciver = "4ba2555fd146e79e37fda7a2f30dc1b4f3d9228aa48b230dbab0a18d407f2f9b";
RawTransactionLCS rawTr = new RawTransactionLCS()
{
ExpirationTime = (ulong)DateTimeOffset.UtcNow.AddSeconds(60)
.ToUnixTimeSeconds(),
GasUnitPrice = 0,
MaxGasAmount = 100000,
SequenceNumber = seqNum
};
rawTr.TransactionPayload = new TransactionPayloadLCS();
rawTr.TransactionPayload.PayloadType = (uint)TransactionPayloadLCSEnum.Script;
rawTr.TransactionPayload.Script = new ScriptLCS()
{
Code = Utilities.PtPTrxBytecode,
TransactionArguments = new List <TransactionArgumentLCS>()
{
new TransactionArgumentLCS()
{
ArgType = (uint)TransactionArgumentLCSEnum.Address,
Address = new AddressLCS(reciver)
},
new TransactionArgumentLCS()
{
ArgType = (uint)TransactionArgumentLCSEnum.U64,
U64 = amount
}
}
};
rawTr.Sender = new AddressLCS(senderHex);
var bytesTrx = LCSCore.LCSSerialization(rawTr);
Types.SignedTransaction signedTx = new Types.SignedTransaction();
var bytesTrxHash = Google.Protobuf.ByteString.CopyFrom(bytesTrx);
var seed = Encoding.ASCII.GetBytes(RAWTX_HASH_SALT + LIBRA_HASH_SUFFIX);
var seedHash = Sha3.Sha3256().ComputeHash(seed);
List <byte> hashInput = new List <byte>();
hashInput.AddRange(seedHash);
hashInput.AddRange(bytesTrxHash);
var hash = Sha3.Sha3256().ComputeHash(hashInput.ToArray());
SubmitTransactionRequest req = new SubmitTransactionRequest();
req.SignedTxn = new SignedTransaction();
List <byte> retArr = new List <byte>();
retArr = retArr.Concat(bytesTrx).ToList();
retArr = retArr.Concat(
LCSCore.LCSSerialization(key.Export(KeyBlobFormat.RawPublicKey))).ToList();
var sig = SignatureAlgorithm.Ed25519.Sign(key, hash);
retArr = retArr.Concat(LCSCore.LCSSerialization(sig)).ToList();
req.SignedTxn.SignedTxn = ByteString.CopyFrom(retArr.ToArray());
var result = client.SubmitTransaction(
req, new Metadata());
Task.Delay(5000).Wait();
GetTransaction(client, senderHex, seqNum);
}
internal PairSetupReturn HandlePairSetupM5(Tlv parts, ConnectionSession session)
{
_logger.LogDebug("Pair Setup Step 5/5");
_logger.LogDebug("Exchange Response");
try
{
var iOsEncryptedData = parts.GetType(Constants.EncryptedData).AsSpan(); // A
var zeros = new byte[] { 0, 0, 0, 0 };
var nonce = new Nonce(zeros, Encoding.UTF8.GetBytes("PS-Msg05"));
var hdkf = new HkdfSha512();
var hkdfEncKey = hdkf.DeriveBytes(
SharedSecret.Import(SrpInteger.FromHex(session.ServerSession.Key).ToByteArray()),
Encoding.UTF8.GetBytes("Pair-Setup-Encrypt-Salt"),
Encoding.UTF8.GetBytes("Pair-Setup-Encrypt-Info"), 32);
var decrypt = AeadAlgorithm.ChaCha20Poly1305.Decrypt(
Key.Import(AeadAlgorithm.ChaCha20Poly1305, hkdfEncKey, KeyBlobFormat.RawSymmetricKey), nonce,
new byte[0], iOsEncryptedData, out var output);
var responseTlv = new Tlv();
responseTlv.AddType(Constants.State, 6);
if (!decrypt)
{
responseTlv.AddType(Constants.Error, ErrorCodes.Authentication);
return(new PairSetupReturn
{
State = 5,
TlvData = responseTlv,
Ok = false
});
}
var subData = TlvParser.Parse(output);
byte[] username = subData.GetType(Constants.Identifier);
byte[] ltpk = subData.GetType(Constants.PublicKey);
byte[] proof = subData.GetType(Constants.Signature);
var okm = hdkf.DeriveBytes(
SharedSecret.Import(SrpInteger.FromHex(session.ServerSession.Key).ToByteArray()),
Encoding.UTF8.GetBytes("Pair-Setup-Controller-Sign-Salt"),
Encoding.UTF8.GetBytes("Pair-Setup-Controller-Sign-Info"), 32);
var completeData = okm.Concat(username).Concat(ltpk).ToArray();
if (!SignatureAlgorithm.Ed25519.Verify(
PublicKey.Import(SignatureAlgorithm.Ed25519, ltpk, KeyBlobFormat.RawPublicKey), completeData,
proof))
{
var errorTlv = new Tlv();
errorTlv.AddType(Constants.Error, ErrorCodes.Authentication);
return(new PairSetupReturn
{
State = 5,
TlvData = errorTlv,
Ok = false
});
}
var m5Response = HandlePairSetupM5Raw(session, out var keyPair);
var plaintext = TlvParser.Serialize(m5Response);
_logger.LogDebug($"Decrypted payload {Automatica.Core.Driver.Utility.Utils.ByteArrayToString(plaintext.AsSpan())}");
var nonce6 = new Nonce(zeros, Encoding.UTF8.GetBytes("PS-Msg06"));
var encryptedOutput = AeadAlgorithm.ChaCha20Poly1305.Encrypt(
Key.Import(AeadAlgorithm.ChaCha20Poly1305, hkdfEncKey, KeyBlobFormat.RawSymmetricKey), nonce6,
new byte[0], plaintext);
responseTlv.AddType(Constants.EncryptedData, encryptedOutput);
return(new PairSetupReturn
{
State = 5,
TlvData = responseTlv,
Ok = true,
Ltsk = ByteArrayToString(keyPair.PrivateKey),
Ltpk = ByteArrayToString(ltpk)
});
}
catch (Exception e)
{
_logger.LogError(e, $"{e}, Could not exchange request");
throw;
}
}
