public Boolean CheckMD5(chave_aut chave)
{
if (_body == null)
{
_body = new Byte[0];
}
header_aut tmp = (header_aut)this.Clone();
tmp.md5 = new Byte[0];
tmp.nop = 0;
Byte[] header = tmp.ToBytes();
Byte[] md5calc = new Byte[header.Length + _body.Length];
Array.Copy(header, 0, md5calc, 0, header.Length);
Array.Copy(_body, 0, md5calc, header.Length, _body.Length);
Byte[] msgBuffer = new Byte[16 + 16 + md5calc.Length];
Array.Copy(chave.akey, 0, msgBuffer, 0, 16);
Array.Copy(md5calc, 0, msgBuffer, 16, md5calc.Length);
Array.Copy(chave.akey, 0, msgBuffer, 16 + md5calc.Length, 16);
md5 md5 = new md5(msgBuffer);
md5.calc();
return(BitConverter.ToString(md5.getHash()) == BitConverter.ToString(base.md5));
}
internal Byte[] decriptaHeader(Byte[] buffer, Int32 size)
{
Byte[] pkt = new Byte[size];
Array.Copy(buffer, pkt, size);
chave = gera_chave(password);
pkt = aut_decripta_buffer(pkt, pkt.Length, 0, chave);
return(pkt);
}
internal Byte[] aut_decripta_buffer(Byte[] buffer, Int32 len, Int32 vet, chave_aut chave)
{
Byte[] iBuffer = new Byte[len];
Array.Copy(buffer, iBuffer, len);
byte[] iv = new byte[8];
Array.Copy(BitConverter.GetBytes((Int32)vet), 0, iv, 0, 4);
Array.Copy(BitConverter.GetBytes((Int32)(~vet)), 0, iv, 4, 4);
BlowfishCBC bl = new BlowfishCBC(chave.key, iv);
bl.decrypt(iBuffer);
return(iBuffer);
}
public void Start()
{
//recebe_pacote chave de sessão
Byte[] buffer = new Byte[24];
Int32 size = _mainSock.Receive(buffer);
if (size < 24)
{
throw new Exception("Erro ao receber chave de sessão");
}
//WriteFile(buffer, 0, size);
header_key header = new header_key(decriptaHeader(buffer, buffer.Length));
aut_seta_n(header.n);
//Separa chave
chave = new chave_aut(header.chave);
Int32 cnt = 0;
if (OnConnectionStarted != null)
{
OnConnectionStarted(_remoteEP, ref cnt);
}
//Prepara pacote para envio ao cliente
ag_greeting greeting = new ag_greeting();
greeting.versao = 4;
greeting.sub_ver = 0;
greeting.release = 1;
greeting.plataforma = (byte)1; //1 = lunix, 2 = Windows
greeting.n_users = cnt;
Byte[] sendBuffer = greeting.ToBytes();
envia_pacote(_mainSock, sendBuffer, sendBuffer.Length, FWAUT_OP_AG_GREETING, FWAUT_ST_OK);
EsperaPacotes();
}
private void _Connect(ref Socket iSock)
{
iSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
iSock.Connect(remoteEP);
chave = gera_chave(password);
header_key header = new header_key();
header.chave = new Byte[] { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
header.n = 1;
header.nop = BitConverter.ToUInt16(header.chave, 0);
Byte[] buffer = header.ToBytes();
buffer = aut_encripta_buffer(buffer, buffer.Length, 0, chave);
String tst = "0x" + BitConverter.ToString(buffer).Replace("-", ", 0x");
aut_seta_n(header.n);
//Envia chave se sessão
iSock.Send(buffer, 0, buffer.Length, SocketFlags.None);
//Separa chave, com a propria chave gerada anteriormente
//Para criptografia posteriores
chave = new chave_aut(header.chave);
packet pkt = recebe_pacote(iSock);
aut_seta_n(pkt.n);
if (pkt.operacao == 5)
{
greeting = new ag_greeting(pkt.body);
}
}