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diff --git a/src/cipher.h b/src/cipher.h
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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