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noise_types.go
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noise_types.go
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// SPDX-License-Identifier: MPL-2.0
/*
* Copyright (C) 2024 The Noisy Sockets Authors.
*
* 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/.
*
* Portions of this file are based on code originally from wireguard-go,
*
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package types
import (
"crypto/rand"
"crypto/subtle"
"encoding/base64"
"golang.org/x/crypto/curve25519"
)
const (
NoisePublicKeySize = 32
NoisePrivateKeySize = 32
NoisePresharedKeySize = 32
)
type (
NoisePublicKey [NoisePublicKeySize]byte
NoisePrivateKey [NoisePrivateKeySize]byte
NoisePresharedKey [NoisePresharedKeySize]byte
NoiseNonce uint64 // padded to 12-bytes
)
func NewPrivateKey() (sk NoisePrivateKey, err error) {
_, err = rand.Read(sk[:])
sk.clamp()
return
}
func (sk *NoisePrivateKey) UnmarshalText(text []byte) error {
b, err := base64.StdEncoding.DecodeString(string(text))
if err != nil {
return err
}
copy(sk[:], b)
return nil
}
func (sk *NoisePrivateKey) clamp() {
sk[0] &= 248
sk[31] = (sk[31] & 127) | 64
}
func (sk NoisePrivateKey) Public() (pk NoisePublicKey) {
apk := (*[NoisePublicKeySize]byte)(&pk)
ask := (*[NoisePrivateKeySize]byte)(&sk)
curve25519.ScalarBaseMult(apk, ask)
return
}
func (sk NoisePrivateKey) Equals(tar NoisePrivateKey) bool {
return subtle.ConstantTimeCompare(sk[:], tar[:]) == 1
}
func (sk NoisePrivateKey) String() string {
return base64.StdEncoding.EncodeToString(sk[:])
}
func (pk *NoisePublicKey) UnmarshalText(text []byte) error {
b, err := base64.StdEncoding.DecodeString(string(text))
if err != nil {
return err
}
copy(pk[:], b)
return nil
}
func (pk NoisePublicKey) Equals(tar NoisePublicKey) bool {
return subtle.ConstantTimeCompare(pk[:], tar[:]) == 1
}
func (pk NoisePublicKey) String() string {
return base64.StdEncoding.EncodeToString(pk[:])
}
func (pk NoisePublicKey) DisplayString() string {
base64Key := base64.StdEncoding.EncodeToString(pk[:])
return base64Key[0:4] + "…" + base64Key[39:43]
}