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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 methods 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) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* Anytun 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 Anytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef ANYTUN_authAlgo_h_INCLUDED
#define ANYTUN_authAlgo_h_INCLUDED
#include "datatypes.h"
#include "buffer.h"
#include "encryptedPacket.h"
#ifndef NO_CRYPT
#if defined(USE_SSL_CRYPTO)
#include <openssl/hmac.h>
#elif defined(USE_NETTLE)
#include <nettle/hmac.h>
#else // USE_GCRYPT is the default
#include <gcrypt.h>
#endif
#endif
#include "keyDerivation.h"
class AuthAlgo
{
public:
AuthAlgo() : dir_(KD_INBOUND) {};
AuthAlgo(kd_dir_t d) : dir_(d) {};
virtual ~AuthAlgo() {};
/**
* generate the mac
* @param packet the packet to be authenticated
*/
virtual void generate(KeyDerivation& kd, EncryptedPacket& packet) = 0;
/**
* check the mac
* @param packet the packet to be authenticated
*/
virtual bool checkTag(KeyDerivation& kd, EncryptedPacket& packet) = 0;
protected:
kd_dir_t dir_;
};
//****** NullAuthAlgo ******
class NullAuthAlgo : public AuthAlgo
{
public:
void generate(KeyDerivation& kd, EncryptedPacket& packet);
bool checkTag(KeyDerivation& kd, EncryptedPacket& packet);
static const uint32_t DIGEST_LENGTH = 0;
};
#ifndef NO_CRYPT
//****** Sha1AuthAlgo ******
//* HMAC SHA1 Auth Tag Generator Class
class AuthAlgoFactory;
class Sha1AuthAlgo : public AuthAlgo
{
friend class AuthAlgoFactory;
public:
~Sha1AuthAlgo();
void generate(KeyDerivation& kd, EncryptedPacket& packet);
bool checkTag(KeyDerivation& kd, EncryptedPacket& packet);
static const uint32_t DIGEST_LENGTH = 20;
private:
Sha1AuthAlgo(kd_dir_t d);
bool Init();
#if defined(USE_SSL_CRYPTO)
HMAC_CTX *ctx_;
#elif defined(USE_NETTLE)
struct hmac_sha1_ctx ctx_;
#else // USE_GCRYPT is the default
gcry_md_hd_t handle_;
#endif
Buffer key_;
};
#endif
#endif
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