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tagger.go
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tagger.go
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// Copyright (C) 2022 CYBERCRYPT
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package crypto
import (
"bytes"
"encoding/gob"
)
const TagLength = 32
const TaggerKeyLength = 32
// Tagger implements the TaggerInterface
type Tagger struct {
Key []byte
}
// NewKMAC256Tagger creates a Tagger which uses KMAC256.
func NewKMAC256Tagger(key []byte) (Tagger, error) {
if len(key) != TaggerKeyLength {
return Tagger{}, ErrInvalidKeyLength
}
return Tagger{Key: key}, nil
}
func (t *Tagger) Tag(data interface{}) ([]byte, error) {
var dataBuffer bytes.Buffer
enc := gob.NewEncoder(&dataBuffer)
if err := enc.Encode(data); err != nil {
return nil, err
}
mac := NewKMAC256(t.Key, TagLength, dataBuffer.Bytes())
macSum := mac.Sum(nil)
return macSum, nil
}