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// Copyright (c) 2024 Sumner Evans
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package backup
import (
"crypto/ecdh"
"encoding/base64"
"encoding/json"
)
// EphemeralKey is a wrapper around an ECDH X25519 public key that implements
// JSON marshalling and unmarshalling.
type EphemeralKey struct {
*ecdh.PublicKey
}
func (k *EphemeralKey) MarshalJSON() ([]byte, error) {
if k == nil || k.PublicKey == nil {
return json.Marshal(nil)
}
return json.Marshal(base64.RawStdEncoding.EncodeToString(k.Bytes()))
}
func (k *EphemeralKey) UnmarshalJSON(data []byte) error {
var keyStr string
err := json.Unmarshal(data, &keyStr)
if err != nil {
return err
}
keyBytes, err := base64.RawStdEncoding.DecodeString(keyStr)
if err != nil {
return err
}
k.PublicKey, err = ecdh.X25519().NewPublicKey(keyBytes)
return err
}
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