added key derivation - not tested yet

1 files changed, 70 insertions, 0 deletions

diff --git a/src/key_derivation.h b/src/key_derivation.h
new file mode 100644
index 0000000..6e1a1e3
--- /dev/null
+++ b/src/key_derivation.h
@@ -0,0 +1,70 @@
+/*
+ *  ľAnytun
+ *
+ *  ľAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
+ *  featured implementation ľAnytun has no support for multiple connections
+ *  or synchronisation. It is a small single threaded implementation intended
+ *  to act as a client on small platforms.
+ *  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) 2007-2008 Christian Pointner <equinox@anytun.org>
+ *
+ *  This file is part of ľAnytun.
+ *
+ *  ľAnytun is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 3 as
+ *  published by the Free Software Foundation.
+ *
+ *  ľAnytun 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 ľAnytun. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _KEY_DERIVATION_H_
+#define _KEY_DERIVATION_H_
+
+#include <gcrypt.h>
+
+enum satp_prf_label_enum {
+  LABEL_SATP_ENCRYPTION  = 0x00,
+  LABEL_SATP_MSG_AUTH    = 0x01,
+  LABEL_SATP_SALT        = 0x02,
+};
+typedef enum satp_prf_label_enum satp_prf_label_t;
+
+enum key_derivation_type_enum { unknown, null, aes_ctr };
+typedef enum key_derivation_type_enum key_derivation_type_t;
+
+struct key_derivation_struct {
+  key_derivation_type_t type_;
+  int8_t ld_kdr_;
+  buffer_t master_key_;
+  buffer_t master_salt_;
+  gcry_cipher_hd_t handle_;
+};
+typedef struct key_derivation_struct key_derivation_t;
+
+int key_derivation_init(key_derivation_t* kd, const char* type, u_int8_t* key, u_int32_t key_len, u_int8_t* salt, u_int32_t salt_len);
+void key_derivation_close(key_derivation_t* kd);
+void key_derivation_generate(key_derivation_t* kd, satp_prf_label_t label, seq_nr_t seq_nr, u_int8_t* key, u_int32_t len);
+
+void key_derivation_null_generate(u_int8_t* key, u_int32_t len);
+
+int key_derivation_aesctr_init(key_derivation_t* kd, u_int8_t* key, u_int32_t key_len, u_int8_t* salt, u_int32_t salt_len);
+void key_derivation_aesctr_close(key_derivation_t* kd);
+buffer_t key_derivation_aesctr_calc_ctr(key_derivation_t* kd, satp_prf_label_t label, seq_nr_t seq_nr);
+void key_derivation_aesctr_generate(key_derivation_t* kd, satp_prf_label_t label, seq_nr_t seq_nr, u_int8_t* key, u_int32_t len);
+
+#endif