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package main
import (
"crypto/subtle"
"encoding/hex"
"errors"
"golang.org/x/crypto/chacha20poly1305"
)
const (
NoisePublicKeySize = 32
NoisePrivateKeySize = 32
)
type (
NoisePublicKey [NoisePublicKeySize]byte
NoisePrivateKey [NoisePrivateKeySize]byte
NoiseSymmetricKey [chacha20poly1305.KeySize]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) error {
return loadExactHex(key[:], src)
}
func (key NoisePrivateKey) ToHex() string {
return hex.EncodeToString(key[:])
}
func (key *NoisePublicKey) FromHex(src string) error {
return loadExactHex(key[:], src)
}
func (key NoisePublicKey) ToHex() string {
return hex.EncodeToString(key[:])
}
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 *NoiseSymmetricKey) FromHex(src string) error {
return loadExactHex(key[:], src)
}
func (key NoiseSymmetricKey) ToHex() string {
return hex.EncodeToString(key[:])
}
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