public static TLEncryptedTransportMessage Decrypt(TLEncryptedTransportMessage transportMessage, byte[] authKey)
{
var keyIV = Utils.GetDecryptKeyIV(authKey, transportMessage.MsgKey);
transportMessage.Data = Utils.AesIge(transportMessage.Data, keyIV.Item1, keyIV.Item2, false);
return(transportMessage);
}
public override TLObject FromBytes(byte[] bytes, ref int position)
{
var response = new TLEncryptedTransportMessage();
response.AuthKeyId = GetObject <TLLong>(bytes, ref position);
response.MsgKey = bytes.SubArray(position, 16);
position += 16;
response.Data = bytes.SubArray(position, bytes.Length - position);
position = bytes.Length;
return(response);
}
public static TLEncryptedTransportMessage Decrypt(TLEncryptedTransportMessage transportMessage, byte[] authKey)
{
var keyIV = TLUtils.GetDecryptKeyIV(authKey, transportMessage.MsgKey);
transportMessage.Data = Utils.AesIge(transportMessage.Data, keyIV.Item1, keyIV.Item2, false);
//var msgKey = TLUtils.GetDecryptMsgKey(authKey, transportMessage.Data);
//if (!TLUtils.ByteArraysEqual(msgKey, transportMessage.MsgKey))
//{
// transportMessage.Data = null;
//}
return(transportMessage);
}
public override TLObject FromBytes(byte[] bytes, ref int position)
{
var response = new TLEncryptedTransportMessage();
response.AuthKeyId = GetObject <TLLong>(bytes, ref position);
//TLUtils.WriteLine("AuthKeyId: " + response.AuthKeyId);
response.MsgKey = bytes.SubArray(position, 16);
//TLUtils.WriteLine("MsgKey: " + BitConverter.ToString(response.MsgKey));
TLUtils.WriteLine(string.Format("\n<<--Parse TLEncryptedTransportMessage AuthKeyId {0}, MsgKey {1}\n----------------------------", response.AuthKeyId, BitConverter.ToString(response.MsgKey)));
//TLUtils.WriteLine("----------------------------");
position += 16;
response.Data = bytes.SubArray(position, bytes.Length - position);
position = bytes.Length;
return(response);
}
public static TLEncryptedTransportMessage Encrypt(TLEncryptedTransportMessage transportMessage, byte[] authKey)
{
var random = new Random();
var data = transportMessage.Data;
var length = data.Length;
var padding = 16 - (length % 16);
byte[] paddingBytes = null;
if (padding > 0 && padding < 16)
{
paddingBytes = new byte[padding];
random.NextBytes(paddingBytes);
}
byte[] dataWithPadding = data;
if (paddingBytes != null)
{
dataWithPadding = data.Concat(paddingBytes).ToArray();
}
var msgKey = TLUtils.GetMsgKey(data);
var keyIV = Utils.GetEncryptKeyIV(authKey, msgKey);
var encryptedData = Utils.AesIge(dataWithPadding, keyIV.Item1, keyIV.Item2, true);
//TLUtils.WriteLine("--Compute auth key sha1--");
var authKeyId = TLUtils.GenerateLongAuthKeyId(authKey);
transportMessage.AuthKeyId = new TLLong(authKeyId);
transportMessage.MsgKey = msgKey;
transportMessage.Data = encryptedData;
return(transportMessage);
}
public static TLEncryptedTransportMessage Encrypt(TLEncryptedTransportMessage transportMessage, byte[] authKey)
{
#if MTPROTO
var random = new SecureRandom();
var data = transportMessage.Data;
var length = data.Length;
var padding = 16 - (length % 16);
byte[] paddingBytes = null;
if (padding < 12)
{
padding += 16;
}
if (padding >= 12 && padding <= 1024)
{
paddingBytes = new byte[padding];
random.NextBytes(paddingBytes);
}
var dataWithPadding = data;
if (paddingBytes != null)
{
dataWithPadding = TLUtils.Combine(data, paddingBytes);
}
var msgKey = TLUtils.GetEncryptMsgKey(authKey, dataWithPadding);
var keyIV = TLUtils.GetEncryptKeyIV(authKey, msgKey);
var encryptedData = Utils.AesIge(dataWithPadding, keyIV.Item1, keyIV.Item2, true);
var authKeyId = TLUtils.GenerateLongAuthKeyId(authKey);
transportMessage.AuthKeyId = new TLLong(authKeyId);
transportMessage.MsgKey = msgKey;
transportMessage.Data = encryptedData;
return(transportMessage);
#else
var random = new SecureRandom();
var data = transportMessage.Data;
var length = data.Length;
var padding = 16 - (length % 16);
byte[] paddingBytes = null;
if (padding > 0 && padding < 16)
{
paddingBytes = new byte[padding];
random.NextBytes(paddingBytes);
}
byte[] dataWithPadding = data;
if (paddingBytes != null)
{
dataWithPadding = TLUtils.Combine(data, paddingBytes);
}
var msgKey = TLUtils.GetMsgKey(data);
var keyIV = TLUtils.GetEncryptKeyIV(authKey, msgKey);
var encryptedData = Utils.AesIge(dataWithPadding, keyIV.Item1, keyIV.Item2, true);
var authKeyId = TLUtils.GenerateLongAuthKeyId(authKey);
transportMessage.AuthKeyId = new TLLong(authKeyId);
transportMessage.MsgKey = msgKey;
transportMessage.Data = encryptedData;
return(transportMessage);
#endif
}
