/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            simplertp-genkey.cc
 *
 *  Sun Sep 21 09:40:48 CEST 2014
 *  Copyright 2014 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of SimpleRTP.
 *
 *  SimpleRTP is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  SimpleRTP 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 SimpleRTP; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include <stdio.h>

int getrandom(char *buf, size_t size)
{
  FILE *fp = fopen("/dev/random", "r");
  if(!fp) {
    perror("Could not open /dev/random for reading");
    return 1;
  }
  int ret = fread(buf, 1, size, fp);
  fclose(fp);

  if(ret != size) {
    fprintf(stderr, "Could not read %d bytes from /dev/random, only got %d\n",
           size, ret);
    return 1;
  }

  return 0;
}

int main()
{
  fprintf(stderr, "Generating key and ssrc...\n");
  fprintf(stderr, " - Move your mouse to generate entropy"
          " or this will take a looooong time.\n");

  char key[30];
  if(getrandom(key, sizeof(key)) != 0) return 1;

  char ssrc[4];
  if(getrandom(ssrc, sizeof(ssrc)) != 0) return 1;
  
  printf("[crypto]\n");
  printf("key=\"");
  for(int i = 0; i < sizeof(key); i++) {
    printf("%02x", (unsigned char)key[i]);
  }
  printf("\"\n");
  printf("ssrc=%u\n", *((unsigned int*)ssrc));

  return 0;
}