/*
  *  OpenVPN -- An application to securely tunnel IP networks
  *             over a single UDP port, with support for SSL/TLS-based
  *             session authentication and key exchange,
  *             packet encryption, packet authentication, and
  *             packet compression.
  *

  *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>

  *
  *  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; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */
 
 /*
  * Each session is identified by a random 8-byte session identifier.
  *
  * For efficiency, the session id is only transmitted over the control
  * channel (which only sees traffic occasionally when keys are being
  * negotiated).  The data channel sees a smaller version of the session-id --
  * it is called the key_id and is currently 2 bits long.
  */
 

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #elif defined(_MSC_VER)
 #include "config-msvc.h"
 #endif
 

 #include "syshead.h"

 
 #include "error.h"
 #include "common.h"
 #include "crypto.h"
 #include "session_id.h"
 
 #include "memdbg.h"
 
 const struct session_id x_session_id_zero;
 
 void

 session_id_random(struct session_id *sid)

 {

     prng_bytes(sid->id, SID_SIZE);

 }
 
 const char *

 session_id_print(const struct session_id *sid, struct gc_arena *gc)

 {

     return format_hex(sid->id, SID_SIZE, 0, gc);

 }