//returns true if a new packet is obtained to _packet
private bool ConstructPacket()
{
if (_cipher == null) //暗号が確立する前
{
if (_buffer.Length < PACKET_LENGTH_FIELD_LEN)
{
return(false);
}
int len = SSHUtil.ReadInt32(_buffer.Data, _buffer.Offset);
if (_buffer.Length < PACKET_LENGTH_FIELD_LEN + len)
{
return(false);
}
ReadPacketFromPlainStream();
}
else
{
if (!_head_is_available)
{
if (_buffer.Length < _cipher.BlockSize)
{
return(false);
}
_cipher.Decrypt(_buffer.Data, _buffer.Offset, _head.Length, _head, 0);
_buffer.Consume(_head.Length);
_head_is_available = true;
}
int len = SSHUtil.ReadInt32(_head, 0);
if (_buffer.Length < len + PACKET_LENGTH_FIELD_LEN - _head.Length + _mac.Size)
{
return(false);
}
ReadPacketWithDecryptedHead();
_head_is_available = false;
}
_sequence++;
return(true);
}
