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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 _KEY_DERIVATION_H_
#define _KEY_DERIVATION_H_
#include <gcrypt.h>
#define KD_LABEL_COUNT 3
enum satp_prf_label_enum {
LABEL_SATP_ENCRYPTION = 0x00,
LABEL_SATP_MSG_AUTH = 0x01,
LABEL_SATP_SALT = 0x02,
};
typedef enum satp_prf_label_enum satp_prf_label_t;
enum key_derivation_type_enum { kd_unknown, kd_null, kd_aes_ctr };
typedef enum key_derivation_type_enum key_derivation_type_t;
struct key_derivation_struct {
key_derivation_type_t type_;
int8_t ld_kdr_;
u_int16_t key_length_;
buffer_t master_key_;
buffer_t master_salt_;
gcry_cipher_hd_t handle_;
buffer_t key_store_[KD_LABEL_COUNT];
};
typedef struct key_derivation_struct key_derivation_t;
int key_derivation_init(key_derivation_t* kd, const char* type, int8_t ld_kdr, u_int8_t* key, u_int32_t key_len, u_int8_t* salt, u_int32_t salt_len);
void key_derivation_close(key_derivation_t* kd);
int key_derivation_generate(key_derivation_t* kd, satp_prf_label_t label, seq_nr_t seq_nr, u_int8_t* key, u_int32_t len);
int key_derivation_null_generate(u_int8_t* key, u_int32_t len);
int key_derivation_aesctr_init(key_derivation_t* kd, u_int16_t key_length);
void key_derivation_aesctr_close(key_derivation_t* kd);
int key_derivation_aesctr_calc_ctr(key_derivation_t* kd, buffer_t* result, satp_prf_label_t label, seq_nr_t seq_nr);
int key_derivation_aesctr_generate(key_derivation_t* kd, satp_prf_label_t label, seq_nr_t seq_nr, u_int8_t* key, u_int32_t len);
#endif
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