ref: 4091eb6fcd02ae5162423788f7da23544a28a3a6
dir: /sys/src/libsec/port/prng.c/
#include "os.h"
#include <libsec.h>
//
// just use the libc prng to fill a buffer
//
void
prng(uchar *p, int n)
{
uchar *e;
for(e = p+n; p < e; p++)
*p = rand();
}