59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer 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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* Fluxer 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 Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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package integration
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/base32"
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"encoding/binary"
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"fmt"
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"strings"
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"testing"
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"time"
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)
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func totpCodeAt(t testing.TB, secret string, at time.Time) string {
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t.Helper()
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decoder := base32.StdEncoding.WithPadding(base32.NoPadding)
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normalized := strings.ToUpper(strings.ReplaceAll(secret, " ", ""))
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key, err := decoder.DecodeString(normalized)
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if err != nil {
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t.Fatalf("failed to decode totp secret: %v", err)
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}
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counter := uint64(at.Unix() / 30)
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var counterBytes [8]byte
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binary.BigEndian.PutUint64(counterBytes[:], counter)
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mac := hmac.New(sha1.New, key)
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if _, err := mac.Write(counterBytes[:]); err != nil {
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t.Fatalf("failed to compute totp hmac: %v", err)
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}
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sum := mac.Sum(nil)
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offset := sum[len(sum)-1] & 0x0f
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code := ((int(sum[offset]) & 0x7f) << 24) |
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((int(sum[offset+1]) & 0xff) << 16) |
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((int(sum[offset+2]) & 0xff) << 8) |
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(int(sum[offset+3]) & 0xff)
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code %= 1000000
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return fmt.Sprintf("%06d", code)
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}
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