4 * uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
5 * featured implementation uAnytun has no support for multiple connections
6 * or synchronisation. It is a small single threaded implementation intended
7 * to act as a client on small platforms.
8 * The secure anycast tunneling protocol (satp) defines a protocol used
9 * for communication between any combination of unicast and anycast
10 * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
11 * mode and allows tunneling of every ETHER TYPE protocol (e.g.
12 * ethernet, ip, arp ...). satp directly includes cryptography and
13 * message authentication based on the methodes used by SRTP. It is
14 * intended to deliver a generic, scaleable and secure solution for
15 * tunneling and relaying of packets of any protocol.
18 * Copyright (C) 2007-2008 Christian Pointner <equinox@anytun.org>
20 * This file is part of uAnytun.
22 * uAnytun is free software: you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License version 3 as
24 * published by the Free Software Foundation.
26 * uAnytun is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
39 #ifndef USE_SSL_CRYPTO
42 #include <openssl/aes.h>
44 #include "key_derivation.h"
46 enum key_derivation_dir_enum { kd_inbound = 0, kd_outbound = 1 };
47 typedef enum key_derivation_dir_enum key_derivation_dir_t;
48 typedef u_int8_t key_derivation_t;
51 enum cipher_type_enum { c_unknown, c_null, c_aes_ctr };
52 typedef enum cipher_type_enum cipher_type_t;
54 struct cipher_struct {
56 u_int16_t key_length_;
61 typedef struct cipher_struct cipher_t;
63 int cipher_init(cipher_t* c, const char* type);
64 void cipher_close(cipher_t* c);
66 int cipher_encrypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, plain_packet_t* in, encrypted_packet_t* out, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
67 int cipher_decrypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, encrypted_packet_t* in, plain_packet_t* out);
69 int32_t cipher_null_crypt(u_int8_t* in, u_int32_t ilen, u_int8_t* out, u_int32_t olen);
74 #define C_AESCTR_DEFAULT_KEY_LENGTH 128
75 #define C_AESCTR_CTR_LENGTH 16
76 #define C_AESCTR_SALT_LENGTH 14
78 union __attribute__((__packed__)) cipher_aesctr_ctr_union {
79 u_int8_t buf_[C_AESCTR_CTR_LENGTH];
80 struct __attribute__ ((__packed__)) {
81 u_int8_t buf_[C_AESCTR_SALT_LENGTH];
84 struct __attribute__((__packed__)) {
85 u_int8_t fill_[C_AESCTR_SALT_LENGTH - sizeof(mux_t) - sizeof(sender_id_t) - 2*sizeof(u_int8_t) - sizeof(seq_nr_t)];
87 sender_id_t sender_id_;
93 typedef union cipher_aesctr_ctr_union cipher_aesctr_ctr_t;
95 struct cipher_aesctr_param_struct {
96 #ifndef USE_SSL_CRYPTO
97 gcry_cipher_hd_t handle_;
100 u_int8_t ecount_buf_[AES_BLOCK_SIZE];
102 cipher_aesctr_ctr_t ctr_;
104 typedef struct cipher_aesctr_param_struct cipher_aesctr_param_t;
106 int cipher_aesctr_init(cipher_t* c);
107 void cipher_aesctr_close(cipher_t* c);
108 int cipher_aesctr_calc_ctr(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
109 int32_t cipher_aesctr_crypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, u_int8_t* in, u_int32_t ilen, u_int8_t* out, u_int32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);