tcryptohelpers.go - tordam - A library for peer discovery inside the Tor network
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tcryptohelpers.go (1192B)
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1 // Copyright (c) 2017-2021 Ivan Jelincic <parazyd@dyne.org>
2 //
3 // This file is part of tordam
4 //
5 // This program is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU Affero General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU Affero General Public License for more details.
14 //
15 // You should have received a copy of the GNU Affero General Public License
16 // along with this program. If not, see <https://www.gnu.org/licenses/>.
17
18 package tordam
19
20 import (
21 "crypto/rand"
22 "encoding/base64"
23 "fmt"
24 )
25
26 // RandomGarbage returns a base64 encoded string of n bytes of entropy.
27 func RandomGarbage(n int) (string, error) {
28 garbage := make([]byte, n)
29 read, err := rand.Read(garbage)
30 if err != nil {
31 return "", err
32 }
33 if n != read {
34 return "", fmt.Errorf("read %d, but requested %d bytes", read, n)
35 }
36 return base64.StdEncoding.EncodeToString(garbage), nil
37 }