lib/random.c

   1 #include <common.h>
   2 #include <stdlib.h>
   3
   4 static unsigned int random_seed;
   5
   6 #if RAND_MAX > 32767
   7 #error this rand implementation is for RAND_MAX < 32678 only.
   8 #endif
   9
  10 unsigned int rand(void)
  11 {
  12         random_seed = random_seed * 1103515245 + 12345;
  13         return (random_seed / 65536) % (RAND_MAX + 1);
  14 }
  15
  16 void srand(unsigned int seed)
  17 {
  18         random_seed = seed;
  19 }
  20
  21 void get_random_bytes(char *buf, int len)
  22 {
  23         while (len--)
  24                 *buf++ = rand() % 256;
  25 }
  26