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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) 2007-2008 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 version 3 as
* published by the Free Software Foundation.
*
* 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/>.
*/
#ifndef _AUTHALGO_H_
#define _AUTHALGO_H_
#include "datatypes.h"
#include "buffer.h"
#include "encryptedPacket.h"
#ifndef NO_CRYPT
#ifndef USE_SSL_CRYPTO
#include <gcrypt.h>
#else
#include <openssl/hmac.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);
};
#ifndef NO_CRYPT
//****** Sha1AuthAlgo ******
//* HMAC SHA1 Auth Tag Generator Class
class Sha1AuthAlgo : public AuthAlgo
{
public:
Sha1AuthAlgo(kd_dir_t d);
~Sha1AuthAlgo();
void generate(KeyDerivation& kd, EncryptedPacket& packet);
bool checkTag(KeyDerivation& kd, EncryptedPacket& packet);
static const u_int32_t DIGEST_LENGTH = 20;
private:
#ifndef USE_SSL_CRYPTO
gcry_md_hd_t handle_;
#else
HMAC_CTX ctx_;
#endif
Buffer key_;
};
#endif
#endif
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