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/*
* �Anytun
*
* �Anytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation �Anytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* 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 Christian Pointner <equinox@anytun.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 _AUTH_ALGO_H_
#define _AUTH_ALGO_H_
#ifndef USE_SSL_CRYPTO
#include <gcrypt.h>
#else
#include <openssl/hmac.h>
#endif
#include "key_derivation.h"
enum auth_algo_type_enum { aa_unknown, aa_null, aa_sha1 };
typedef enum auth_algo_type_enum auth_algo_type_t;
struct auth_algo_struct {
auth_algo_type_t type_;
buffer_t key_;
void* params_;
};
typedef struct auth_algo_struct auth_algo_t;
int auth_algo_init(auth_algo_t* aa, const char* type);
void auth_algo_close(auth_algo_t* aa);
void auth_algo_generate(auth_algo_t* aa, key_derivation_t* kd, key_store_dir_t dir, encrypted_packet_t* packet);
int auth_algo_check_tag(auth_algo_t* aa, key_derivation_t* kd, key_store_dir_t dir, encrypted_packet_t* packet);
#define SHA1_LENGTH 20
struct auth_algo_sha1_param_struct {
#ifndef USE_SSL_CRYPTO
gcry_md_hd_t handle_;
#else
HMAC_CTX ctx_;
#endif
};
typedef struct auth_algo_sha1_param_struct auth_algo_sha1_param_t;
int auth_algo_sha1_init(auth_algo_t* aa);
void auth_algo_sha1_close(auth_algo_t* aa);
void auth_algo_sha1_generate(auth_algo_t* aa, key_derivation_t* kd, key_store_dir_t dir, encrypted_packet_t* packet);
int auth_algo_sha1_check_tag(auth_algo_t* aa, key_derivation_t* kd, key_store_dir_t dir, encrypted_packet_t* packet);
#endif
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