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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdexcept>
#include "datatypes.h"
#include "cypher.h"
void Cypher::cypher(Buffer& buf)
{
Buffer stream = getBitStream(buf.getLength());
exor(buf, stream);
}
void Cypher::exor(Buffer& buf, const Buffer& bit_stream)
{
try
{
for(u_int32_t i; i<buf.getLength(); ++i)
buf[i] ^= bit_stream[i];
}
catch(std::out_of_range& o) {}
}
Buffer NullCypher::getBitStream(u_int32_t length)
{
Buffer buf(length);
for(u_int32_t i; i<length; ++i)
buf[i] = 0;
return buf;
}
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