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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 _KEYDERIVATION_H_
#define _KEYDERIVATION_H_
#include "datatypes.h"
#include "buffer.h"
extern "C" {
#include <gcrypt.h>
}
typedef enum {
label_satp_encryption = 0x00,
label_satp_msg_auth = 0x01,
label_satp_salt = 0x02,
} satp_prf_label;
class KeyDerivation
{
public:
KeyDerivation() : ld_kdr_(-1), cipher_(NULL) {};
virtual ~KeyDerivation() {};
void init(Buffer key, Buffer salt);
void setLogKDRate(const u_int8_t ld_rate);
void generate(satp_prf_label label, seq_nr_t seq_nr, Buffer& key, u_int32_t length);
void clear();
protected:
int8_t ld_kdr_; // ld(key_derivation_rate)
Buffer salt_;
static const char* MIN_GCRYPT_VERSION;
gcry_cipher_hd_t cipher_;
};
#endif
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