4 * The secure anycast tunneling protocol (satp) defines a protocol used
5 * for communication between any combination of unicast and anycast
6 * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
7 * mode and allows tunneling of every ETHER TYPE protocol (e.g.
8 * ethernet, ip, arp ...). satp directly includes cryptography and
9 * message authentication based on the methods used by SRTP. It is
10 * intended to deliver a generic, scaleable and secure solution for
11 * tunneling and relaying of packets of any protocol.
14 * Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
15 * Christian Pointner <satp@wirdorange.org>
17 * This file is part of Anytun.
19 * Anytun is free software: you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation, either version 3 of the License, or
24 * Anytun is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with Anytun. If not, see <http://www.gnu.org/licenses/>.
32 * In addition, as a special exception, the copyright holders give
33 * permission to link the code of portions of this program with the
34 * OpenSSL library under certain conditions as described in each
35 * individual source file, and distribute linked combinations
37 * You must obey the GNU General Public License in all respects
38 * for all of the code used other than OpenSSL. If you modify
39 * file(s) with this exception, you may extend this exception to your
40 * version of the file(s), but you are not obligated to do so. If you
41 * do not wish to do so, delete this exception statement from your
42 * version. If you delete this exception statement from all source
43 * files in the program, then also delete it here.
46 #ifndef ANYTUN_cipher_h_INCLUDED
47 #define ANYTUN_cipher_h_INCLUDED
49 #include "datatypes.h"
51 #include "encryptedPacket.h"
52 #include "plainPacket.h"
53 #include "keyDerivation.h"
57 #if defined(USE_SSL_CRYPTO)
58 #include <openssl/aes.h>
59 #elif defined(USE_NETTLE)
60 #include <nettle/aes.h>
61 #else // USE_GCRYPT is the default
70 Cipher() : dir_(KD_INBOUND) {};
71 Cipher(kd_dir_t d) : dir_(d) {};
74 void encrypt(KeyDerivation& kd, PlainPacket& in, EncryptedPacket& out, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
75 void decrypt(KeyDerivation& kd, EncryptedPacket& in, PlainPacket& out);
78 virtual uint32_t cipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux) = 0;
79 virtual uint32_t decipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux) = 0;
84 //****** NullCipher ******
86 class NullCipher : public Cipher
89 uint32_t cipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
90 uint32_t decipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
94 //****** AesIcmCipher ******
96 class AesIcmCipher : public Cipher
99 AesIcmCipher(kd_dir_t d);
100 AesIcmCipher(kd_dir_t d, uint16_t key_length);
103 static const uint16_t DEFAULT_KEY_LENGTH = 128;
104 static const uint16_t CTR_LENGTH = 16;
105 static const uint16_t SALT_LENGTH = 14;
108 uint32_t cipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
109 uint32_t decipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
112 void init(uint16_t key_length = DEFAULT_KEY_LENGTH);
114 void calcCtr(KeyDerivation& kd, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
115 void calc(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
117 #if defined(USE_SSL_CRYPTO)
119 uint8_t ecount_buf_[AES_BLOCK_SIZE];
120 #elif defined(USE_NETTLE)
122 #else // USE_GCRYPT is the default
123 gcry_cipher_hd_t handle_;
130 #pragma pack(push, 1)
132 union ATTR_PACKED cipher_aesctr_ctr_union {
133 uint8_t buf_[CTR_LENGTH];
135 uint8_t buf_[SALT_LENGTH];
139 uint8_t fill_[SALT_LENGTH - sizeof(mux_t) - sizeof(sender_id_t) - 2*sizeof(uint8_t) - sizeof(seq_nr_t)];
141 sender_id_t sender_id_;