Random strings in Go

randstring.go

package main

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
	"io"
)

func randomString(n int) (str string, err error) {
	buf := make([]byte, n)

	if _, err = io.ReadFull(rand.Reader, buf); err != nil {
		return
	}

	str = hex.EncodeToString(buf)
	return
}

func main() {
	if str, err := randomString(20); err != nil {
		panic(err)
	} else {
		fmt.Println(str)
	}
}