mirror of
https://github.com/muun/recovery.git
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127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
package sphinx
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import (
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"io"
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"github.com/btcsuite/btcd/btcec"
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)
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// OnionErrorEncrypter is a struct that's used to implement onion error
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// encryption as defined within BOLT0004.
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type OnionErrorEncrypter struct {
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sharedSecret Hash256
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}
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// NewOnionErrorEncrypter creates new instance of the onion encrypter backed by
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// the passed router, with encryption to be doing using the passed
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// ephemeralKey.
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func NewOnionErrorEncrypter(router *Router,
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ephemeralKey *btcec.PublicKey) (*OnionErrorEncrypter, error) {
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sharedSecret, err := router.generateSharedSecret(ephemeralKey)
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if err != nil {
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return nil, err
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}
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return &OnionErrorEncrypter{
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sharedSecret: sharedSecret,
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}, nil
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}
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// Encode writes the encrypter's shared secret to the provided io.Writer.
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func (o *OnionErrorEncrypter) Encode(w io.Writer) error {
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_, err := w.Write(o.sharedSecret[:])
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return err
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}
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// Decode restores the encrypter's share secret from the provided io.Reader.
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func (o *OnionErrorEncrypter) Decode(r io.Reader) error {
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_, err := io.ReadFull(r, o.sharedSecret[:])
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return err
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}
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// Circuit is used encapsulate the data which is needed for data deobfuscation.
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type Circuit struct {
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// SessionKey is the key which have been used during generation of the
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// shared secrets.
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SessionKey *btcec.PrivateKey
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// PaymentPath is the pub keys of the nodes in the payment path.
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PaymentPath []*btcec.PublicKey
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}
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// Decode initializes the circuit from the byte stream.
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func (c *Circuit) Decode(r io.Reader) error {
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var keyLength [1]byte
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if _, err := r.Read(keyLength[:]); err != nil {
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return err
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}
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sessionKeyData := make([]byte, uint8(keyLength[0]))
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if _, err := r.Read(sessionKeyData[:]); err != nil {
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return err
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}
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c.SessionKey, _ = btcec.PrivKeyFromBytes(btcec.S256(), sessionKeyData)
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var pathLength [1]byte
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if _, err := r.Read(pathLength[:]); err != nil {
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return err
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}
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c.PaymentPath = make([]*btcec.PublicKey, uint8(pathLength[0]))
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for i := 0; i < len(c.PaymentPath); i++ {
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var pubKeyData [btcec.PubKeyBytesLenCompressed]byte
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if _, err := r.Read(pubKeyData[:]); err != nil {
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return err
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}
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pubKey, err := btcec.ParsePubKey(pubKeyData[:], btcec.S256())
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if err != nil {
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return err
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}
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c.PaymentPath[i] = pubKey
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}
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return nil
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}
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// Encode writes converted circuit in the byte stream.
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func (c *Circuit) Encode(w io.Writer) error {
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var keyLength [1]byte
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keyLength[0] = uint8(len(c.SessionKey.Serialize()))
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if _, err := w.Write(keyLength[:]); err != nil {
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return err
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}
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if _, err := w.Write(c.SessionKey.Serialize()); err != nil {
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return err
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}
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var pathLength [1]byte
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pathLength[0] = uint8(len(c.PaymentPath))
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if _, err := w.Write(pathLength[:]); err != nil {
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return err
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}
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for _, pubKey := range c.PaymentPath {
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if _, err := w.Write(pubKey.SerializeCompressed()); err != nil {
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return err
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}
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}
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return nil
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}
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// OnionErrorDecrypter is a struct that's used to decrypt onion errors in
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// response to failed HTLC routing attempts according to BOLT#4.
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type OnionErrorDecrypter struct {
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circuit *Circuit
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}
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// NewOnionErrorDecrypter creates new instance of onion decrypter.
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func NewOnionErrorDecrypter(circuit *Circuit) *OnionErrorDecrypter {
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return &OnionErrorDecrypter{
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circuit: circuit,
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}
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}
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