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https://github.com/superseriousbusiness/gotosocial.git
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365b575341* [feature] add TOTP two-factor authentication (2FA) * use byteutil.S2B to avoid allocations when comparing + generating password hashes * don't bother with string conversion for consts * use io.ReadFull * use MustGenerateSecret for backup codes * rename util functions
47 lines
1.7 KiB
Go
47 lines
1.7 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"crypto/rand"
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"encoding/base32"
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"io"
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)
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// crockfordBase32 is an encoding alphabet that misses characters I,L,O,U,
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// to avoid confusion and abuse. See: http://www.crockford.com/wrmg/base32.html
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const crockfordBase32 = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
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// base32enc is a pre-initialized CrockfordBase32 encoding without any padding.
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var base32enc = base32.NewEncoding(crockfordBase32).WithPadding(base32.NoPadding)
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// MustGenerateSecret returns a cryptographically-secure,
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// CrockfordBase32-encoded string of 32 chars in length
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// (ie., 20-bytes/160 bits of entropy), or panics on error.
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//
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// The source of randomness is crypto/rand.
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func MustGenerateSecret() string {
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// Crockford base32 with no padding
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// encodes 20 bytes to 32 characters.
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const blen = 20
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b := make([]byte, blen)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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panic(err)
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}
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return base32enc.EncodeToString(b)
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}
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