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package main
import (
"fmt"
"golang.org/x/sys/unix"
"log"
"math/rand"
"os"
"time"
"unsafe"
)
const BUFSIZE = 512
type rand_pool_info struct {
entropy_count int
buf_size int
buf [512]byte
}
var pid int
func init() {
log.SetFlags(0)
pid = os.Getpid()
}
func ioctl(fd int, req uint, ptr unsafe.Pointer) error {
_, _, errno := unix.Syscall(unix.SYS_IOCTL,
uintptr(fd),
uintptr(req),
uintptr(ptr))
if errno != 0 {
return fmt.Errorf("ioctl: %w", errno)
}
return nil
}
func feed(fd int) error {
seed := pid * time.Now().Nanosecond()
rand.Seed(int64(seed))
output := &rand_pool_info{
entropy_count: BUFSIZE * 8,
buf_size: BUFSIZE,
}
rand.Read(output.buf[:])
err := ioctl(fd, unix.RNDADDENTROPY, unsafe.Pointer(output))
if err != nil {
return err
}
return nil
}
func main() {
fd, err := unix.Open("/dev/random", unix.O_RDWR, 0)
if err != nil {
log.Fatal(err)
}
defer unix.Close(fd)
for {
if err := feed(fd); err != nil {
log.Fatalf("feed failed: %s", err)
}
time.Sleep(time.Second)
}
}
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