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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 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 uAnytun.
*
* uAnytun 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.
*
* 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/>.
*/
#ifndef _KEY_DERIVATION_H_
#define _KEY_DERIVATION_H_
#ifndef USE_SSL_CRYPTO
#include <gcrypt.h>
#else
#include <openssl/aes.h>
#endif
#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;
enum key_store_dir_enum { kd_inbound = 0, kd_outbound = 1 };
typedef enum key_store_dir_enum key_store_dir_t;
struct key_store_struct {
buffer_t key_;
seq_nr_t r_;
};
typedef struct key_store_struct key_store_t;
struct key_derivation_struct {
key_derivation_type_t type_;
u_int16_t key_length_;
int8_t ld_kdr_;
buffer_t master_key_;
buffer_t master_salt_;
key_store_t key_store_[2][KD_LABEL_COUNT];
void* params_;
};
typedef struct key_derivation_struct key_derivation_t;
int key_derivation_init(key_derivation_t* kd, const char* type, int8_t ld_kdr, const char* passphrase, u_int8_t* key, u_int32_t key_len, u_int8_t* salt, u_int32_t salt_len);
#ifndef NO_PASSPHRASE
int key_derivation_generate_master_key(key_derivation_t* kd, const char* passphrase, u_int16_t key_length);
int key_derivation_generate_master_salt(key_derivation_t* kd, const char* passphrase, u_int16_t salt_length);
#endif
void key_derivation_close(key_derivation_t* kd);
int key_derivation_generate(key_derivation_t* kd, key_store_dir_t dir, 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);
#define KD_AESCTR_DEFAULT_KEY_LENGTH 128
#define KD_AESCTR_CTR_LENGTH 16
#define KD_AESCTR_SALT_LENGTH 14
union __attribute__((__packed__)) key_derivation_aesctr_ctr_union {
u_int8_t buf_[KD_AESCTR_CTR_LENGTH];
struct __attribute__ ((__packed__)) {
u_int8_t buf_[KD_AESCTR_SALT_LENGTH];
u_int16_t zero_;
} salt_;
#ifndef ANYTUN_02_COMPAT
struct __attribute__((__packed__)) {
u_int8_t fill_[KD_AESCTR_SALT_LENGTH - sizeof(u_int8_t) - sizeof(seq_nr_t)];
u_int8_t label_;
seq_nr_t r_;
u_int16_t zero_;
} params_;
#else
struct __attribute__((__packed__)) {
u_int8_t fill_[KD_AESCTR_SALT_LENGTH - sizeof(u_int8_t) - 2 - sizeof(seq_nr_t)];
u_int8_t label_;
u_int8_t r_fill_[2];
seq_nr_t r_;
u_int16_t zero_;
} params_;
#endif
};
typedef union key_derivation_aesctr_ctr_union key_derivation_aesctr_ctr_t;
struct key_derivation_aesctr_param_struct {
#ifndef USE_SSL_CRYPTO
gcry_cipher_hd_t handle_;
#else
AES_KEY aes_key_;
u_int8_t ecount_buf_[AES_BLOCK_SIZE];
#endif
key_derivation_aesctr_ctr_t ctr_;
};
typedef struct key_derivation_aesctr_param_struct key_derivation_aesctr_param_t;
int key_derivation_aesctr_init(key_derivation_t* kd, const char* passphrase);
void key_derivation_aesctr_close(key_derivation_t* kd);
int key_derivation_aesctr_calc_ctr(key_derivation_t* kd, key_store_dir_t dir, seq_nr_t* r, satp_prf_label_t label, seq_nr_t seq_nr);
int key_derivation_aesctr_generate(key_derivation_t* kd, key_store_dir_t dir, satp_prf_label_t label, seq_nr_t seq_nr, u_int8_t* key, u_int32_t len);
#endif
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