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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun 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 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 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun 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.
*
* uAnytun 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 uAnytun. 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 UANYTUN_auth_algo_h_INCLUDED
#define UANYTUN_auth_algo_h_INCLUDED
#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
#include "key_derivation.h"
#include "encrypted_packet.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;
auth_algo_type_t auth_algo_get_type(const char* type);
u_int32_t auth_algo_get_max_length(const char* type);
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_derivation_dir_t dir, encrypted_packet_t* packet);
int auth_algo_check_tag(auth_algo_t* aa, key_derivation_t* kd, key_derivation_dir_t dir, encrypted_packet_t* packet);
#define SHA1_LENGTH 20
struct auth_algo_sha1_param_struct {
#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
};
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_derivation_dir_t dir, encrypted_packet_t* packet);
int auth_algo_sha1_check_tag(auth_algo_t* aa, key_derivation_t* kd, key_derivation_dir_t dir, encrypted_packet_t* packet);
#endif
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