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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"crypto/subtle"
"encoding/hex"
"errors"
)
const (
NoisePublicKeySize = 32
NoisePrivateKeySize = 32
NoisePresharedKeySize = 32
)
type (
NoisePublicKey [NoisePublicKeySize]byte
NoisePrivateKey [NoisePrivateKeySize]byte
NoisePresharedKey [NoisePresharedKeySize]byte
NoiseNonce uint64 // padded to 12-bytes
)
func loadExactHex(dst []byte, src string) error {
slice, err := hex.DecodeString(src)
if err != nil {
return err
}
if len(slice) != len(dst) {
return errors.New("hex string does not fit the slice")
}
copy(dst, slice)
return nil
}
func (key NoisePrivateKey) IsZero() bool {
var zero NoisePrivateKey
return key.Equals(zero)
}
func (key NoisePrivateKey) Equals(tar NoisePrivateKey) bool {
return subtle.ConstantTimeCompare(key[:], tar[:]) == 1
}
func (key *NoisePrivateKey) FromHex(src string) (err error) {
err = loadExactHex(key[:], src)
key.clamp()
return
}
func (key *NoisePrivateKey) FromMaybeZeroHex(src string) (err error) {
err = loadExactHex(key[:], src)
if key.IsZero() {
return
}
key.clamp()
return
}
func (key *NoisePublicKey) FromHex(src string) error {
return loadExactHex(key[:], src)
}
func (key NoisePublicKey) IsZero() bool {
var zero NoisePublicKey
return key.Equals(zero)
}
func (key NoisePublicKey) Equals(tar NoisePublicKey) bool {
return subtle.ConstantTimeCompare(key[:], tar[:]) == 1
}
func (key *NoisePresharedKey) FromHex(src string) error {
return loadExactHex(key[:], src)
}
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