| public static CRCHash ( byte input ) : byte[] | ||
| input | byte | |
| return | byte[] | |
public static byte[] Compress(byte[] buffer)
{
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(ms))
{
byte[] crc = CryptoHelper.CRCHash(buffer);
writer.Write(VZipHeader);
writer.Write((byte)Version);
writer.Write(crc);
Int32 dictionary = 1 << 23;
Int32 posStateBits = 2;
Int32 litContextBits = 3;
Int32 litPosBits = 0;
Int32 algorithm = 2;
Int32 numFastBytes = 128;
SevenZip.CoderPropID[] propIDs =
{
SevenZip.CoderPropID.DictionarySize,
SevenZip.CoderPropID.PosStateBits,
SevenZip.CoderPropID.LitContextBits,
SevenZip.CoderPropID.LitPosBits,
SevenZip.CoderPropID.Algorithm,
SevenZip.CoderPropID.NumFastBytes,
SevenZip.CoderPropID.MatchFinder,
SevenZip.CoderPropID.EndMarker
};
object[] properties =
{
(Int32)(dictionary),
(Int32)(posStateBits),
(Int32)(litContextBits),
(Int32)(litPosBits),
(Int32)(algorithm),
(Int32)(numFastBytes),
"bt4",
false
};
SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(ms);
using (MemoryStream input = new MemoryStream(buffer)) {
encoder.Code(input, ms, -1, -1, null);
}
writer.Write(crc);
writer.Write((uint)buffer.Length);
writer.Write(VZipFooter);
return(ms.ToArray());
}
}
void HandleEncryptRequest(IPacketMsg packetMsg)
{
var encRequest = new Msg <MsgChannelEncryptRequest>(packetMsg);
EUniverse eUniv = encRequest.Body.Universe;
uint protoVersion = encRequest.Body.ProtocolVersion;
DebugLog.WriteLine("UFSClient", "Got encryption request. Universe: {0} Protocol ver: {1}", eUniv, protoVersion);
DebugLog.Assert(protoVersion == 1, "UFSClient", "Encryption handshake protocol version mismatch!");
byte[] pubKey = KeyDictionary.GetPublicKey(eUniv);
if (pubKey == null)
{
DebugLog.WriteLine("UFSClient", "HandleEncryptionRequest got request for invalid universe! Universe: {0} Protocol ver: {1}", eUniv, protoVersion);
return;
}
ConnectedUniverse = eUniv;
var encResp = new Msg <MsgChannelEncryptResponse>();
tempSessionKey = CryptoHelper.GenerateRandomBlock(32);
byte[] cryptedSessKey = null;
using (var rsa = new RSACrypto(pubKey))
{
cryptedSessKey = rsa.Encrypt(tempSessionKey);
}
byte[] keyCrc = CryptoHelper.CRCHash(cryptedSessKey);
encResp.Write(cryptedSessKey);
encResp.Write(keyCrc);
encResp.Write(( uint )0);
this.Send(encResp);
}
void HandleEncryptRequest(IPacketMsg packetMsg)
{
var encRequest = new Msg <MsgChannelEncryptRequest>(packetMsg);
EUniverse eUniv = encRequest.Body.Universe;
uint protoVersion = encRequest.Body.ProtocolVersion;
DebugLog.WriteLine("UFSClient", "Got encryption request. Universe: {0} Protocol ver: {1}", eUniv, protoVersion);
DebugLog.Assert(protoVersion == 1, "UFSClient", "Encryption handshake protocol version mismatch!");
byte[] randomChallenge;
if (encRequest.Payload.Length >= 16)
{
randomChallenge = encRequest.Payload.ToArray();
}
else
{
randomChallenge = null;
}
byte[] pubKey = KeyDictionary.GetPublicKey(eUniv);
if (pubKey == null)
{
connection.Disconnect();
DebugLog.WriteLine("UFSClient", "HandleEncryptionRequest got request for invalid universe! Universe: {0} Protocol ver: {1}", eUniv, protoVersion);
return;
}
ConnectedUniverse = eUniv;
var encResp = new Msg <MsgChannelEncryptResponse>();
var tempSessionKey = CryptoHelper.GenerateRandomBlock(32);
byte[] encryptedHandshakeBlob = null;
using (var rsa = new RSACrypto(pubKey))
{
if (randomChallenge != null)
{
var blobToEncrypt = new byte[tempSessionKey.Length + randomChallenge.Length];
Array.Copy(tempSessionKey, blobToEncrypt, tempSessionKey.Length);
Array.Copy(randomChallenge, 0, blobToEncrypt, tempSessionKey.Length, randomChallenge.Length);
encryptedHandshakeBlob = rsa.Encrypt(blobToEncrypt);
}
else
{
encryptedHandshakeBlob = rsa.Encrypt(tempSessionKey);
}
}
var keyCrc = CryptoHelper.CRCHash(encryptedHandshakeBlob);
encResp.Write(encryptedHandshakeBlob);
encResp.Write(keyCrc);
encResp.Write(( uint )0);
if (randomChallenge != null)
{
pendingNetFilterEncryption = new NetFilterEncryptionWithHMAC(tempSessionKey);
}
else
{
pendingNetFilterEncryption = new NetFilterEncryption(tempSessionKey);
}
this.Send(encResp);
}
void HandleEncryptRequest( IPacketMsg packetMsg )
{
var request = new Msg<MsgChannelEncryptRequest>( packetMsg );
var connectedUniverse = request.Body.Universe;
var protoVersion = request.Body.ProtocolVersion;
log.LogDebug( nameof(EnvelopeEncryptedConnection), "Got encryption request. Universe: {0} Protocol ver: {1}", connectedUniverse, protoVersion );
DebugLog.Assert( protoVersion == 1, nameof(EnvelopeEncryptedConnection), "Encryption handshake protocol version mismatch!" );
DebugLog.Assert( connectedUniverse == universe, nameof(EnvelopeEncryptedConnection), FormattableString.Invariant( $"Expected universe {universe} but server reported universe {connectedUniverse}" ) );
byte[]? randomChallenge;
if ( request.Payload.Length >= 16 )
{
randomChallenge = request.Payload.ToArray();
}
else
{
randomChallenge = null;
}
var publicKey = KeyDictionary.GetPublicKey( connectedUniverse );
if ( publicKey == null )
{
log.LogDebug( nameof(EnvelopeEncryptedConnection), "HandleEncryptRequest got request for invalid universe! Universe: {0} Protocol ver: {1}", connectedUniverse, protoVersion );
Disconnect( userInitiated: false );
return;
}
var response = new Msg<MsgChannelEncryptResponse>();
var tempSessionKey = CryptoHelper.GenerateRandomBlock( 32 );
byte[] encryptedHandshakeBlob;
using ( var rsa = new RSACrypto( publicKey ) )
{
if ( randomChallenge != null )
{
var blobToEncrypt = new byte[ tempSessionKey.Length + randomChallenge.Length ];
Array.Copy( tempSessionKey, blobToEncrypt, tempSessionKey.Length );
Array.Copy( randomChallenge, 0, blobToEncrypt, tempSessionKey.Length, randomChallenge.Length );
encryptedHandshakeBlob = rsa.Encrypt( blobToEncrypt );
}
else
{
encryptedHandshakeBlob = rsa.Encrypt( tempSessionKey );
}
}
var keyCrc = CryptoHelper.CRCHash( encryptedHandshakeBlob );
response.Write( encryptedHandshakeBlob );
response.Write( keyCrc );
response.Write( ( uint )0 );
if (randomChallenge != null)
{
encryption = new NetFilterEncryptionWithHMAC( tempSessionKey, log );
}
else
{
encryption = new NetFilterEncryption( tempSessionKey, log );
}
var serialized = response.Serialize();
try
{
debugNetworkListener?.OnOutgoingNetworkMessage( response.MsgType, serialized );
}
catch ( Exception e )
{
log.LogDebug( nameof( EnvelopeEncryptedConnection ), "DebugNetworkListener threw an exception: {0}", e );
}
state = EncryptionState.Challenged;
Send( serialized );
}