Skip to content
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
38 lines (30 sloc) 983 Bytes
// Copyright 2016 The Mellium Contributors.
// Use of this source code is governed by the BSD 2-clause
// license that can be found in the LICENSE file.
package attr
import (
// IDLen is the standard length of stanza identifiers in bytes.
const IDLen = 16
// TODO: This will be called a lot, and probably needs to be faster than we can
// get when reading from getrandom(2). Should we use a fast userspace
// CSPRNG and just seed with data from the OS?
// RandomID generates a new random identifier of length IDLen. If the OS's
// entropy pool isn't initialized, or we can't generate random numbers for some
// other reason, panic.
func RandomID() string {
return randomID(IDLen, rand.Reader)
func randomID(n int, r io.Reader) string {
b := make([]byte, (n/2)+(n&1))
switch n, err := r.Read(b); {
case err != nil:
case n != len(b):
panic("Could not read enough randomness")
return fmt.Sprintf("%x", b)[:n]
You can’t perform that action at this time.