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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 _KEYDERIVATION_H_
+#define _KEYDERIVATION_H_
+
+#include "datatypes.h"
+#include "buffer.h"
+
+
+extern "C" {
+  #include <srtp/crypto_kernel.h>
+}
+
+
+typedef enum {
+  label_satp_encryption  = 0x00,
+  label_satp_msg_auth    = 0x01,
+  label_satp_salt        = 0x02,
+} satp_prf_label;
+
+class KeyDerivation
+{
+public:
+  KeyDerivation() : ld_kdr_(-1) {};
+  virtual ~KeyDerivation() {};
+
+  err_status_t init(const uint8_t key[30], const uint8_t salt[14]);
+  err_status_t setLogKDRate(const uint8_t ld_rate);
+  err_status_t generate(satp_prf_label label, seq_nr_t seq_nr, uint8_t *key, int length);
+  err_status_t clear();
+
+protected:
+  aes_icm_ctx_t kdf_;
+  int8_t ld_kdr_;     // ld(key_derivation_rate)
+  uint8_t salt_[14];
+};
+
+#endif