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 methodes 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) 2007-2009 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 #ifndef ANYTUN_authAlgo_h_INCLUDED
33 #define ANYTUN_authAlgo_h_INCLUDED
35 #include "datatypes.h"
37 #include "encryptedPacket.h"
40 #ifndef USE_SSL_CRYPTO
43 #include <openssl/hmac.h>
46 #include "keyDerivation.h"
51 AuthAlgo() : dir_(KD_INBOUND) {};
52 AuthAlgo(kd_dir_t d) : dir_(d) {};
53 virtual ~AuthAlgo() {};
57 * @param packet the packet to be authenticated
59 virtual void generate(KeyDerivation& kd, EncryptedPacket& packet) = 0;
63 * @param packet the packet to be authenticated
65 virtual bool checkTag(KeyDerivation& kd, EncryptedPacket& packet) = 0;
71 //****** NullAuthAlgo ******
73 class NullAuthAlgo : public AuthAlgo
76 void generate(KeyDerivation& kd, EncryptedPacket& packet);
77 bool checkTag(KeyDerivation& kd, EncryptedPacket& packet);
79 static const u_int32_t DIGEST_LENGTH = 0;
83 //****** Sha1AuthAlgo ******
84 //* HMAC SHA1 Auth Tag Generator Class
86 class Sha1AuthAlgo : public AuthAlgo
89 Sha1AuthAlgo(kd_dir_t d);
92 void generate(KeyDerivation& kd, EncryptedPacket& packet);
93 bool checkTag(KeyDerivation& kd, EncryptedPacket& packet);
95 static const u_int32_t DIGEST_LENGTH = 20;
98 #ifndef USE_SSL_CRYPTO