/* keygen.c - High entropy key generator - Don Yang (uguu.org)

   01/06/05
                                                                           */

#include<stdio.h>
#include<stdlib.h>
#include<time.h>


int main(int argc, char **argv)
{
   unsigned char key[256], x;
   unsigned int i, j, k;
   FILE *outfile;

   if( argc < 2 )
      return printf("%s <outfile>\n", *argv);
   if( (outfile = fopen(argv[1], "wb+")) == NULL )
      return printf("Can not create %s\n", argv[1]);

   for(i = 0; i < 256; i++)
      key[i] = (unsigned char)i;
   srand((unsigned)time(NULL));
   for(k = 0; k < 0x10000; k++)
   {
      i = (unsigned)rand() & 255;
      j = (unsigned)rand() & 255;
      x = key[i];
      key[i] = key[j];
      key[j] = x;
   }

   (void)fwrite(key, 256, 1, outfile);
   (void)fclose(outfile);
   return 0;
}