gistfile1.go

func randomHexString(length int) (string, error) {
	chars := "01234567890abcdef"
	bytes := make([]byte, length)
	for idx, _ := range bytes {
		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(chars))))
		if err != nil {
			return "", err
		}
		bytes[idx] = chars[num.Int64()]
	}
	return string(bytes), nil
}