public MessageManager(OTR_VERSION otr_version)
{
if (otr_version == OTR_VERSION.INVALID)
{
throw new ArgumentException("MessageManager: The OTR version is invalid");
}
_otr_version = otr_version;
_temp_buffer = null;
try
{
Utility.GetEncodedOtrVersion(otr_version, ref _encoded_otr_version_byte_array);
_message_length_1 = _encoded_otr_version_byte_array.Length;
if (_otr_version != OTR_VERSION.VERSION_2)
{
_my_instance_tag = Utility.GetRandomInteger(OTRConstants.MIN_INSTANCE_VALUE);
_temp_buffer = BitConverter.GetBytes(_my_instance_tag);
Utility.EncodeOTRInt(_temp_buffer, ref _encoded_my_instance_tag);
_message_length_1 += _encoded_my_instance_tag.Length * 2;
}
_temp_buffer = new byte[1];
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_DH_COMMIT;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_dh_commit_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_DH_KEY;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_dh_key_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_REVEAL_SIGNATURE;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_reveal_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_SIGNATURE;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_signature_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_DATA;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_data_message_type);
_temp_buffer[0] = 0;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_flag);
_message_length_1 += _encoded_data_message_type.Length;
}
catch (Exception ex)
{
throw new InvalidDataException("MessageManager:" + ex.ToString());
}
}
public MessageManager(OTR_VERSION otr_version)
{
if (otr_version == OTR_VERSION.INVALID)
throw new ArgumentException("MessageManager: The OTR version is invalid");
_otr_version = otr_version;
_temp_buffer = null;
try
{
Utility.GetEncodedOtrVersion(otr_version, ref _encoded_otr_version_byte_array);
_message_length_1 = _encoded_otr_version_byte_array.Length;
if (_otr_version != OTR_VERSION.VERSION_2)
{
_my_instance_tag = Utility.GetRandomInteger(OTRConstants.MIN_INSTANCE_VALUE);
_temp_buffer = BitConverter.GetBytes(_my_instance_tag);
Utility.EncodeOTRInt(_temp_buffer, ref _encoded_my_instance_tag);
_message_length_1 += _encoded_my_instance_tag.Length * 2;
}
_temp_buffer = new byte[1];
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_DH_COMMIT;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_dh_commit_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_DH_KEY;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_dh_key_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_REVEAL_SIGNATURE;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_reveal_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_SIGNATURE;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_signature_message_type);
_temp_buffer[0] = OTRConstants.MESSAGE_TYPE_DATA;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_data_message_type);
_temp_buffer[0] = 0;
Utility.EncodeOTRByte(_temp_buffer, ref _encoded_flag);
_message_length_1 += _encoded_data_message_type.Length;
}
catch (Exception ex)
{
throw new InvalidDataException("MessageManager:" + ex.ToString());
}
}
public void RequestOTRSession(string my_buddy_unique_id, string otr_version)
{
if (string.IsNullOrEmpty(otr_version) == true)
{
throw new ArgumentException("RequestOTRSession: The OTR version string cannot be null/empty");
}
if (IsSessionRegistered(my_buddy_unique_id) == false)
{
throw new ArgumentException("RequestOTRSession: my buddy unique id does not exist");
}
OTR_VERSION _otr_version = Utility.GetOTRVersion(otr_version);
if (_otr_version == OTR_VERSION.INVALID)
{
throw new ArgumentException("RequestOTRSession: OTR version is invalid");
}
string _otr_version_string = string.Empty;
if (_otr_version == OTR_VERSION.VERSION_2)
{
_otr_version_string = OTRConstants.OTR_VERSION_2;
}
else if (_otr_version == OTR_VERSION.VERSION_3)
{
_otr_version_string = OTRConstants.OTR_VERSION_3;
}
OTREventArgs _event_args = new OTREventArgs();
_event_args.SetMessage(_otr_version_string);
_event_args.SetOTREvent(OTR_EVENT.SEND);
_event_args.SetSessionID(my_buddy_unique_id);
OnOTREvent(this, _event_args);
}
public void SetProtocolVersion(OTR_VERSION protocol_version)
{
_protocol_version = protocol_version;
}
public void SetProtocolVersion(OTR_VERSION protocol_version)
{
_protocol_version = protocol_version;
}
public static void GetEncodedOtrVersion(OTR_VERSION version, ref byte[] encoded_otr_version_byte_array)
{
if (version == OTR_VERSION.INVALID)
return;
byte [] _temp_buffer = null;
byte [] _otr_version = new byte [2];
if (version == OTR_VERSION.VERSION_2)
{
_temp_buffer = BitConverter.GetBytes(OTRConstants.iOTR_VERSION_2);
Buffer.BlockCopy (_temp_buffer,0,_otr_version,0,_otr_version.Length);
}
else if (version == OTR_VERSION.VERSION_3)
{
_temp_buffer = BitConverter.GetBytes(OTRConstants.iOTR_VERSION_3);
Buffer.BlockCopy (_temp_buffer,0,_otr_version,0,_otr_version.Length);
}
if (_otr_version == null || _otr_version.Length < 1)
return;
Utility.EncodeOTRShort(_otr_version, ref encoded_otr_version_byte_array);
}
private void SetOTRVersion(OTR_VERSION otr_version)
{
_current_otr_version = otr_version;
_message_manager = new MessageManager(otr_version);
DebugPrint("Setting OTR Version:" + otr_version);
}
public OTRMessage ExtractMessage(byte[] in_message_byte_array)
{
int _next_index = 0;
_otr_message = null;
_temp_buffer = null;
_message_type = OTR_MESSAGE_TYPE.INVALID;
//get protocol version
_next_index = Utility.DecodeShortFromBytes(in_message_byte_array, _next_index, ref _temp_buffer_2);
OTR_VERSION _otr_version = Utility.GetOTRVersion(_temp_buffer_2);
if (_otr_version == OTR_VERSION.INVALID)
{
throw new ArgumentException("ExtractMessage:OTR version is invalid");
}
_otr_message = new OTRMessage();
_otr_message.SetProtocolVersion(_otr_version);
// get message type
_temp_buffer_2 = _temp_buffer = null;
_next_index = Utility.DecodeByteFromBytes(in_message_byte_array, _next_index, ref _temp_buffer_2);
_message_type = GetMessageType(_temp_buffer_2[0]);
if (_message_type == OTR_MESSAGE_TYPE.INVALID)
{
throw new ArgumentException("ExtractMessage:OTR message type is invalid");
}
_otr_message.SetMessageType(_message_type);
//get instance tags
if (_otr_version != OTR_VERSION.VERSION_2)
{
_temp_buffer_2 = _temp_buffer = null;
_next_index = Utility.DecodeIntFromBytes(in_message_byte_array, _next_index, ref _temp_buffer_2);
_otr_message.SetSenderInstanceTag(_temp_buffer_2);
if (_otr_message.GetSenderInstanceTag() < 4)
{
throw new ArgumentException("ExtractMessage:The Sender's instance tag cannot be less than 4");
}
if (_buddy_instance_tag == 0)
{
_buddy_instance_tag = _otr_message.GetSenderInstanceTag();
}
if (_buddy_instance_tag != 0 && _otr_message.GetSenderInstanceTag() != _buddy_instance_tag)
{
throw new ArgumentException("ExtractMessage:The Sender's instance tag is invalid");
}
_temp_buffer_2 = _temp_buffer = null;
_next_index = Utility.DecodeIntFromBytes(in_message_byte_array, _next_index, ref _temp_buffer_2);
_otr_message.SetReceiverInstanceTag(_temp_buffer_2);
}
if (_message_type == OTR_MESSAGE_TYPE.DATA)
{
return(ExtractData(in_message_byte_array, _next_index));
}
else if (_message_type == OTR_MESSAGE_TYPE.DH_COMMIT)
{
return(ExtractDHCommit(in_message_byte_array, _next_index));
}
else if (_message_type == OTR_MESSAGE_TYPE.DH_KEY)
{
return(ExtractDHKey(in_message_byte_array, _next_index));
}
else if (_message_type == OTR_MESSAGE_TYPE.REVEAL_SIGNATURE)
{
return(ExtractRevealSig(in_message_byte_array, _next_index));
}
else if (_message_type == OTR_MESSAGE_TYPE.SIGNATURE)
{
return(ExtractSignature(in_message_byte_array, _next_index));
}
return(null);
}
