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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
*/
#ifndef _AUTHALGO_H_
#define _AUTHALGO_H_
#include "authTag.h"
#include "datatypes.h"
#include "buffer.h"
#include "threadUtils.hpp"
#include <gcrypt.h>
class AuthAlgo
{
public:
AuthAlgo() {};
virtual ~AuthAlgo() {};
virtual AuthTag calc(const Buffer& buf) { return AuthTag(0); };
virtual void setKey(Buffer key) {};
};
class NullAuthAlgo : public AuthAlgo
{
public:
NullAuthAlgo() {};
AuthTag calc(const Buffer& buf);
void setKey(Buffer key) {};
};
/**
* HMAC SHA1 Auth Tag Generator Class
*/
class Sha1AuthAlgo : public AuthAlgo
{
public:
Sha1AuthAlgo();
~Sha1AuthAlgo();
/**
* set the key for the auth algo
* @param key key for hmac calculation
*/
void setKey(Buffer key);
/**
* calculate the sha1 hmac
* @param buf buffer for message digest
* @return sha1 hmac
*/
AuthTag calc(const Buffer& buf);
protected:
static const char* MIN_GCRYPT_VERSION;
static const u_int32_t GCRYPT_SEC_MEM = 32768; // 32k secure memory
gcry_md_hd_t ctx_;
Mutex mutex_;
};
#endif
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