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+/*
+ * anytun
+ *
+ * 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 anytun.org <satp@wirdorange.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _CIPHER_H_
+#define _CIPHER_H_
+
+#include "datatypes.h"
+#include "buffer.h"
+#include "encryptedPacket.h"
+#include "plainPacket.h"
+
+#include <gcrypt.h>
+
+
+class Cipher
+{
+public:
+ virtual ~Cipher() {};
+
+ // TODO: in should be const but does not work with getBuf() :(
+ void encrypt(PlainPacket & in, EncryptedPacket & out, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
+ void decrypt(EncryptedPacket & in, PlainPacket & out);
+
+ virtual void setKey(Buffer& key) = 0;
+ virtual void setSalt(Buffer& salt) = 0;
+
+protected:
+ virtual u_int32_t cipher(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) = 0;
+ virtual u_int32_t decipher(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) = 0;
+};
+
+//****** NullCipher ******
+
+class NullCipher : public Cipher
+{
+public:
+ void setKey(Buffer& key) {};
+ void setSalt(Buffer& salt) {};
+
+protected:
+ u_int32_t cipher(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);
+ u_int32_t decipher(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);
+};
+
+//****** AesIcmCipher ******
+
+class AesIcmCipher : public Cipher
+{
+public:
+ AesIcmCipher();
+ ~AesIcmCipher();
+ void setKey(Buffer& key);
+ void setSalt(Buffer& salt);
+
+protected:
+ u_int32_t cipher(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);
+ u_int32_t decipher(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);
+
+private:
+ void calc(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);
+
+ gcry_cipher_hd_t cipher_;
+ Buffer salt_;
+};
+
+
+#endif