ref: bc7d74f09b53c39ada4e73ce73c01c6c0928f9f4
dir: /sys/src/cmd/unix/drawterm/libsec/prng.c/
#include "os.h"
#include <mp.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();
}