func main() {
rng, _ := fortuna.NewRNG("")
out, err := os.Create(outputFileName)
if err != nil {
log.Fatalf("cannot open %s: %s", outputFileName, err.Error())
}
defer out.Close()
n, _ := io.CopyN(out, rng, outputFileSize)
log.Printf("wrote %d random bytes to %s", n, outputFileName)
}
func main() {
trace.Register(printTrace, "", trace.PrioDebug)
rng, err := fortuna.NewRNG(seedFileName)
if err != nil {
panic("cannot initialise the RNG: " + err.Error())
}
defer rng.Close()
// entropy source 1: submit some randomness from crypto/rand once a minute
go func() {
sink1 := rng.NewEntropyDataSink()
for _ = range time.Tick(time.Minute) {
buffer := make([]byte, 4)
n, _ := rand.Read(buffer)
sink1 <- buffer[:n]
}
}()
// entropy source 2: submit time between requests
sink2 := rng.NewEntropyTimeStampSink()
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
sink2 <- time.Now()
sizeStr := r.URL.Query().Get("len")
size, _ := strconv.ParseInt(sizeStr, 0, 32)
if size <= 0 {
size = 16
}
w.Header().Set("Content-Length", fmt.Sprintf("%d", size))
io.CopyN(w, rng, size)
trace.T("main", trace.PrioInfo,
"sent %d random bytes for %q", size, r.RequestURI)
})
listenAddr := ":8080"
trace.T("main", trace.PrioInfo,
"listening on http://localhost%s/", listenAddr)
err = http.ListenAndServe(listenAddr, nil)
if err != nil {
trace.T("main", trace.PrioCritical, "%s", err.Error())
}
}