/// <summary>
/// Конструктор по умолчанию
/// </summary>
/// <param name="authKey"></param>
/// <param name="data"></param>
public EncryptedMessage(byte[] authKey, EncryptedData data, int x)
{
SHA1 sha1 = SHA1.Create();
_authKey = authKey;
byte[] hash = sha1.ComputeHash(authKey);
AuthKeyId = BitConverter.ToInt64(hash, hash.Length - 8);
hash = sha1.ComputeHash(data.SerializeNoPadding());
var buf = new byte[16];
Array.Copy(hash, hash.Length - 16, buf, 0, 16);
MsgKey = new BigInteger(buf);
_x = x;
Data = data;
}
public EncryptedMessage PrepareRpcCall(SessionContainer request)
{
SHA1.Create();
var encData = new EncryptedData
{
Salt = Salt,
SessionId = SessionId,
MessageId = GetNextMessageId(),
SeqNo = GetNextSeqNo(),
MessageData = request.Combinator.Serialize()
};
encData.MessageDataLength = encData.MessageData.Length;
return new EncryptedMessage(_authKey, encData, 0);
}
public EncryptedMessage(byte[] authKey, byte[] plainData)
{
_authKey = authKey;
using (var ms = new MemoryStream(plainData))
{
using (var br = new BinaryReader(ms))
{
AuthKeyId = br.ReadInt64();
MsgKey = new BigInteger(br.ReadBytes(16));
// дешифруем эту дату
byte[] aesKey = CalculateAesKey(8, MsgKey.GetBytes());
byte[] aesIv = CalculateIV(8, MsgKey.GetBytes());
var aesIge = new Aes256IgeManaged(aesKey, aesIv);
Data = new EncryptedData(aesIge.Decrypt(br.ReadBytes(plainData.Length - 8 - 16)));
}
}
}
