Peter Stuifzand
90074d28d6
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continuous-integration/drone/push Build is passing
Solution: Paste license on top of all files. This does not change the license. It was already licensed as GPLv3.
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
/*
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* Ekster is a microsub server
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* Copyright (c) 2021 The Ekster authors
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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 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package websub
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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"strings"
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"github.com/pkg/errors"
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)
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// ValidateHubSignature validate a sha1 signature that could be send with the
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// hub as an extra header
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func ValidateHubSignature(sig string, feedContent, secret []byte) error {
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parts := strings.Split(sig, "=")
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if len(parts) != 2 {
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return errors.New("signature format is not like sha1=signature")
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}
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if parts[0] != "sha1" {
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return errors.New("signature format is not like sha1=signature")
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}
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// verification
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mac := hmac.New(sha1.New, secret)
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mac.Write(feedContent)
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signature := mac.Sum(nil)
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signature2, err := hex.DecodeString(parts[1])
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if err != nil {
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return errors.Wrap(err, "could not decode signature")
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}
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if !hmac.Equal(signature, signature2) {
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return fmt.Errorf("signature does not match feed %s %s", signature, parts[1])
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}
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return nil
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}
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