p2p: move rlpx into separate package (#21464)
This change moves the RLPx protocol implementation into a separate package, p2p/rlpx. The new package can be used to establish RLPx connections for protocol testing purposes. Co-authored-by: Felix Lange <fjl@twurst.com>
This commit is contained in:
rene
GitHub
669
p2p/rlpx/rlpx.go
Normal file
669
p2p/rlpx/rlpx.go
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@ -0,0 +1,669 @@
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package rlpx implements the RLPx transport protocol.
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package rlpx
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/hmac"
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"crypto/rand"
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"encoding/binary"
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"errors"
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"fmt"
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"hash"
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"io"
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mrand "math/rand"
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"net"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/crypto/ecies"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/golang/snappy"
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"golang.org/x/crypto/sha3"
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)
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// Conn is an RLPx network connection. It wraps a low-level network connection. The
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// underlying connection should not be used for other activity when it is wrapped by Conn.
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//
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// Before sending messages, a handshake must be performed by calling the Handshake method.
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// This type is not generally safe for concurrent use, but reading and writing of messages
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// may happen concurrently after the handshake.
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type Conn struct {
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dialDest *ecdsa.PublicKey
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conn net.Conn
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handshake *handshakeState
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snappy bool
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}
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type handshakeState struct {
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enc cipher.Stream
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dec cipher.Stream
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macCipher cipher.Block
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egressMAC hash.Hash
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ingressMAC hash.Hash
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}
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// NewConn wraps the given network connection. If dialDest is non-nil, the connection
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// behaves as the initiator during the handshake.
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func NewConn(conn net.Conn, dialDest *ecdsa.PublicKey) *Conn {
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return &Conn{
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dialDest: dialDest,
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conn: conn,
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}
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}
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// SetSnappy enables or disables snappy compression of messages. This is usually called
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// after the devp2p Hello message exchange when the negotiated version indicates that
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// compression is available on both ends of the connection.
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func (c *Conn) SetSnappy(snappy bool) {
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c.snappy = snappy
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}
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// SetReadDeadline sets the deadline for all future read operations.
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func (c *Conn) SetReadDeadline(time time.Time) error {
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return c.conn.SetReadDeadline(time)
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}
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// SetWriteDeadline sets the deadline for all future write operations.
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func (c *Conn) SetWriteDeadline(time time.Time) error {
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return c.conn.SetWriteDeadline(time)
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}
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// SetDeadline sets the deadline for all future read and write operations.
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func (c *Conn) SetDeadline(time time.Time) error {
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return c.conn.SetDeadline(time)
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}
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// Read reads a message from the connection.
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func (c *Conn) Read() (code uint64, data []byte, wireSize int, err error) {
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if c.handshake == nil {
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panic("can't ReadMsg before handshake")
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}
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frame, err := c.handshake.readFrame(c.conn)
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if err != nil {
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return 0, nil, 0, err
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}
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code, data, err = rlp.SplitUint64(frame)
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if err != nil {
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return 0, nil, 0, fmt.Errorf("invalid message code: %v", err)
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}
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wireSize = len(data)
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// If snappy is enabled, verify and decompress message.
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if c.snappy {
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var actualSize int
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actualSize, err = snappy.DecodedLen(data)
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if err != nil {
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return code, nil, 0, err
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}
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if actualSize > maxUint24 {
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return code, nil, 0, errPlainMessageTooLarge
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}
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data, err = snappy.Decode(nil, data)
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}
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return code, data, wireSize, err
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}
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func (h *handshakeState) readFrame(conn io.Reader) ([]byte, error) {
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// read the header
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headbuf := make([]byte, 32)
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if _, err := io.ReadFull(conn, headbuf); err != nil {
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return nil, err
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}
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// verify header mac
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shouldMAC := updateMAC(h.ingressMAC, h.macCipher, headbuf[:16])
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if !hmac.Equal(shouldMAC, headbuf[16:]) {
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return nil, errors.New("bad header MAC")
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}
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h.dec.XORKeyStream(headbuf[:16], headbuf[:16]) // first half is now decrypted
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fsize := readInt24(headbuf)
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// ignore protocol type for now
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// read the frame content
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var rsize = fsize // frame size rounded up to 16 byte boundary
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if padding := fsize % 16; padding > 0 {
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rsize += 16 - padding
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}
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framebuf := make([]byte, rsize)
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if _, err := io.ReadFull(conn, framebuf); err != nil {
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return nil, err
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}
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// read and validate frame MAC. we can re-use headbuf for that.
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h.ingressMAC.Write(framebuf)
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fmacseed := h.ingressMAC.Sum(nil)
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if _, err := io.ReadFull(conn, headbuf[:16]); err != nil {
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return nil, err
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}
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shouldMAC = updateMAC(h.ingressMAC, h.macCipher, fmacseed)
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if !hmac.Equal(shouldMAC, headbuf[:16]) {
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return nil, errors.New("bad frame MAC")
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}
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// decrypt frame content
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h.dec.XORKeyStream(framebuf, framebuf)
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return framebuf[:fsize], nil
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}
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// Write writes a message to the connection.
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//
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// Write returns the written size of the message data. This may be less than or equal to
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// len(data) depending on whether snappy compression is enabled.
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func (c *Conn) Write(code uint64, data []byte) (uint32, error) {
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if c.handshake == nil {
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panic("can't WriteMsg before handshake")
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}
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if len(data) > maxUint24 {
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return 0, errPlainMessageTooLarge
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}
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if c.snappy {
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data = snappy.Encode(nil, data)
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}
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wireSize := uint32(len(data))
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err := c.handshake.writeFrame(c.conn, code, data)
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return wireSize, err
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}
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func (h *handshakeState) writeFrame(conn io.Writer, code uint64, data []byte) error {
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ptype, _ := rlp.EncodeToBytes(code)
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// write header
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headbuf := make([]byte, 32)
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fsize := len(ptype) + len(data)
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if fsize > maxUint24 {
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return errPlainMessageTooLarge
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}
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putInt24(uint32(fsize), headbuf)
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copy(headbuf[3:], zeroHeader)
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h.enc.XORKeyStream(headbuf[:16], headbuf[:16]) // first half is now encrypted
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// write header MAC
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copy(headbuf[16:], updateMAC(h.egressMAC, h.macCipher, headbuf[:16]))
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if _, err := conn.Write(headbuf); err != nil {
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return err
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}
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// write encrypted frame, updating the egress MAC hash with
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// the data written to conn.
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tee := cipher.StreamWriter{S: h.enc, W: io.MultiWriter(conn, h.egressMAC)}
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if _, err := tee.Write(ptype); err != nil {
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return err
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}
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if _, err := tee.Write(data); err != nil {
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return err
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}
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if padding := fsize % 16; padding > 0 {
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if _, err := tee.Write(zero16[:16-padding]); err != nil {
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return err
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}
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}
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// write frame MAC. egress MAC hash is up to date because
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// frame content was written to it as well.
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fmacseed := h.egressMAC.Sum(nil)
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mac := updateMAC(h.egressMAC, h.macCipher, fmacseed)
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_, err := conn.Write(mac)
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return err
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}
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func readInt24(b []byte) uint32 {
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return uint32(b[2]) | uint32(b[1])<<8 | uint32(b[0])<<16
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}
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func putInt24(v uint32, b []byte) {
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b[0] = byte(v >> 16)
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b[1] = byte(v >> 8)
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b[2] = byte(v)
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}
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// updateMAC reseeds the given hash with encrypted seed.
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// it returns the first 16 bytes of the hash sum after seeding.
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func updateMAC(mac hash.Hash, block cipher.Block, seed []byte) []byte {
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aesbuf := make([]byte, aes.BlockSize)
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block.Encrypt(aesbuf, mac.Sum(nil))
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for i := range aesbuf {
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aesbuf[i] ^= seed[i]
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}
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mac.Write(aesbuf)
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return mac.Sum(nil)[:16]
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}
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// Handshake performs the handshake. This must be called before any data is written
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// or read from the connection.
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func (c *Conn) Handshake(prv *ecdsa.PrivateKey) (*ecdsa.PublicKey, error) {
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var (
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sec Secrets
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err error
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)
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if c.dialDest != nil {
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sec, err = initiatorEncHandshake(c.conn, prv, c.dialDest)
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} else {
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sec, err = receiverEncHandshake(c.conn, prv)
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}
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if err != nil {
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return nil, err
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}
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c.InitWithSecrets(sec)
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return sec.remote, err
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}
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// InitWithSecrets injects connection secrets as if a handshake had
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// been performed. This cannot be called after the handshake.
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func (c *Conn) InitWithSecrets(sec Secrets) {
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if c.handshake != nil {
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panic("can't handshake twice")
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}
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macc, err := aes.NewCipher(sec.MAC)
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if err != nil {
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panic("invalid MAC secret: " + err.Error())
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}
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encc, err := aes.NewCipher(sec.AES)
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if err != nil {
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panic("invalid AES secret: " + err.Error())
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}
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// we use an all-zeroes IV for AES because the key used
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// for encryption is ephemeral.
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iv := make([]byte, encc.BlockSize())
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c.handshake = &handshakeState{
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enc: cipher.NewCTR(encc, iv),
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dec: cipher.NewCTR(encc, iv),
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macCipher: macc,
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egressMAC: sec.EgressMAC,
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ingressMAC: sec.IngressMAC,
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}
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}
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// Close closes the underlying network connection.
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func (c *Conn) Close() error {
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return c.conn.Close()
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}
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// Constants for the handshake.
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const (
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maxUint24 = int(^uint32(0) >> 8)
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sskLen = 16 // ecies.MaxSharedKeyLength(pubKey) / 2
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sigLen = crypto.SignatureLength // elliptic S256
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pubLen = 64 // 512 bit pubkey in uncompressed representation without format byte
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shaLen = 32 // hash length (for nonce etc)
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authMsgLen = sigLen + shaLen + pubLen + shaLen + 1
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authRespLen = pubLen + shaLen + 1
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eciesOverhead = 65 /* pubkey */ + 16 /* IV */ + 32 /* MAC */
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encAuthMsgLen = authMsgLen + eciesOverhead // size of encrypted pre-EIP-8 initiator handshake
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encAuthRespLen = authRespLen + eciesOverhead // size of encrypted pre-EIP-8 handshake reply
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)
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var (
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// this is used in place of actual frame header data.
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// TODO: replace this when Msg contains the protocol type code.
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zeroHeader = []byte{0xC2, 0x80, 0x80}
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// sixteen zero bytes
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zero16 = make([]byte, 16)
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// errPlainMessageTooLarge is returned if a decompressed message length exceeds
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// the allowed 24 bits (i.e. length >= 16MB).
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errPlainMessageTooLarge = errors.New("message length >= 16MB")
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)
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// Secrets represents the connection secrets which are negotiated during the handshake.
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type Secrets struct {
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AES, MAC []byte
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EgressMAC, IngressMAC hash.Hash
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remote *ecdsa.PublicKey
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}
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// encHandshake contains the state of the encryption handshake.
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type encHandshake struct {
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initiator bool
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remote *ecies.PublicKey // remote-pubk
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initNonce, respNonce []byte // nonce
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randomPrivKey *ecies.PrivateKey // ecdhe-random
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remoteRandomPub *ecies.PublicKey // ecdhe-random-pubk
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}
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// RLPx v4 handshake auth (defined in EIP-8).
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type authMsgV4 struct {
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gotPlain bool // whether read packet had plain format.
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Signature [sigLen]byte
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InitiatorPubkey [pubLen]byte
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Nonce [shaLen]byte
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Version uint
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// Ignore additional fields (forward-compatibility)
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Rest []rlp.RawValue `rlp:"tail"`
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}
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// RLPx v4 handshake response (defined in EIP-8).
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type authRespV4 struct {
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RandomPubkey [pubLen]byte
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Nonce [shaLen]byte
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Version uint
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// Ignore additional fields (forward-compatibility)
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Rest []rlp.RawValue `rlp:"tail"`
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}
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// receiverEncHandshake negotiates a session token on conn.
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// it should be called on the listening side of the connection.
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//
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// prv is the local client's private key.
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func receiverEncHandshake(conn io.ReadWriter, prv *ecdsa.PrivateKey) (s Secrets, err error) {
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authMsg := new(authMsgV4)
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authPacket, err := readHandshakeMsg(authMsg, encAuthMsgLen, prv, conn)
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if err != nil {
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return s, err
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}
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h := new(encHandshake)
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if err := h.handleAuthMsg(authMsg, prv); err != nil {
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return s, err
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}
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authRespMsg, err := h.makeAuthResp()
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if err != nil {
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return s, err
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}
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var authRespPacket []byte
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if authMsg.gotPlain {
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authRespPacket, err = authRespMsg.sealPlain(h)
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} else {
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authRespPacket, err = sealEIP8(authRespMsg, h)
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}
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if err != nil {
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return s, err
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}
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if _, err = conn.Write(authRespPacket); err != nil {
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return s, err
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}
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return h.secrets(authPacket, authRespPacket)
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}
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func (h *encHandshake) handleAuthMsg(msg *authMsgV4, prv *ecdsa.PrivateKey) error {
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// Import the remote identity.
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rpub, err := importPublicKey(msg.InitiatorPubkey[:])
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if err != nil {
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return err
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}
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h.initNonce = msg.Nonce[:]
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h.remote = rpub
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|
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// Generate random keypair for ECDH.
|
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// If a private key is already set, use it instead of generating one (for testing).
|
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if h.randomPrivKey == nil {
|
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h.randomPrivKey, err = ecies.GenerateKey(rand.Reader, crypto.S256(), nil)
|
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if err != nil {
|
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return err
|
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}
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}
|
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|
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// Check the signature.
|
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token, err := h.staticSharedSecret(prv)
|
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if err != nil {
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return err
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}
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signedMsg := xor(token, h.initNonce)
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remoteRandomPub, err := crypto.Ecrecover(signedMsg, msg.Signature[:])
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if err != nil {
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return err
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}
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h.remoteRandomPub, _ = importPublicKey(remoteRandomPub)
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return nil
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}
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|
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// secrets is called after the handshake is completed.
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// It extracts the connection secrets from the handshake values.
|
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func (h *encHandshake) secrets(auth, authResp []byte) (Secrets, error) {
|
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ecdheSecret, err := h.randomPrivKey.GenerateShared(h.remoteRandomPub, sskLen, sskLen)
|
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if err != nil {
|
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return Secrets{}, err
|
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}
|
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|
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// derive base secrets from ephemeral key agreement
|
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sharedSecret := crypto.Keccak256(ecdheSecret, crypto.Keccak256(h.respNonce, h.initNonce))
|
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aesSecret := crypto.Keccak256(ecdheSecret, sharedSecret)
|
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s := Secrets{
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remote: h.remote.ExportECDSA(),
|
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AES: aesSecret,
|
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MAC: crypto.Keccak256(ecdheSecret, aesSecret),
|
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}
|
||||
|
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// setup sha3 instances for the MACs
|
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mac1 := sha3.NewLegacyKeccak256()
|
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mac1.Write(xor(s.MAC, h.respNonce))
|
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mac1.Write(auth)
|
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mac2 := sha3.NewLegacyKeccak256()
|
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mac2.Write(xor(s.MAC, h.initNonce))
|
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mac2.Write(authResp)
|
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if h.initiator {
|
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s.EgressMAC, s.IngressMAC = mac1, mac2
|
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} else {
|
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s.EgressMAC, s.IngressMAC = mac2, mac1
|
||||
}
|
||||
|
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return s, nil
|
||||
}
|
||||
|
||||
// staticSharedSecret returns the static shared secret, the result
|
||||
// of key agreement between the local and remote static node key.
|
||||
func (h *encHandshake) staticSharedSecret(prv *ecdsa.PrivateKey) ([]byte, error) {
|
||||
return ecies.ImportECDSA(prv).GenerateShared(h.remote, sskLen, sskLen)
|
||||
}
|
||||
|
||||
// initiatorEncHandshake negotiates a session token on conn.
|
||||
// it should be called on the dialing side of the connection.
|
||||
//
|
||||
// prv is the local client's private key.
|
||||
func initiatorEncHandshake(conn io.ReadWriter, prv *ecdsa.PrivateKey, remote *ecdsa.PublicKey) (s Secrets, err error) {
|
||||
h := &encHandshake{initiator: true, remote: ecies.ImportECDSAPublic(remote)}
|
||||
authMsg, err := h.makeAuthMsg(prv)
|
||||
if err != nil {
|
||||
return s, err
|
||||
}
|
||||
authPacket, err := sealEIP8(authMsg, h)
|
||||
if err != nil {
|
||||
return s, err
|
||||
}
|
||||
|
||||
if _, err = conn.Write(authPacket); err != nil {
|
||||
return s, err
|
||||
}
|
||||
|
||||
authRespMsg := new(authRespV4)
|
||||
authRespPacket, err := readHandshakeMsg(authRespMsg, encAuthRespLen, prv, conn)
|
||||
if err != nil {
|
||||
return s, err
|
||||
}
|
||||
if err := h.handleAuthResp(authRespMsg); err != nil {
|
||||
return s, err
|
||||
}
|
||||
return h.secrets(authPacket, authRespPacket)
|
||||
}
|
||||
|
||||
// makeAuthMsg creates the initiator handshake message.
|
||||
func (h *encHandshake) makeAuthMsg(prv *ecdsa.PrivateKey) (*authMsgV4, error) {
|
||||
// Generate random initiator nonce.
|
||||
h.initNonce = make([]byte, shaLen)
|
||||
_, err := rand.Read(h.initNonce)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// Generate random keypair to for ECDH.
|
||||
h.randomPrivKey, err = ecies.GenerateKey(rand.Reader, crypto.S256(), nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Sign known message: static-shared-secret ^ nonce
|
||||
token, err := h.staticSharedSecret(prv)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
signed := xor(token, h.initNonce)
|
||||
signature, err := crypto.Sign(signed, h.randomPrivKey.ExportECDSA())
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
msg := new(authMsgV4)
|
||||
copy(msg.Signature[:], signature)
|
||||
copy(msg.InitiatorPubkey[:], crypto.FromECDSAPub(&prv.PublicKey)[1:])
|
||||
copy(msg.Nonce[:], h.initNonce)
|
||||
msg.Version = 4
|
||||
return msg, nil
|
||||
}
|
||||
|
||||
func (h *encHandshake) handleAuthResp(msg *authRespV4) (err error) {
|
||||
h.respNonce = msg.Nonce[:]
|
||||
h.remoteRandomPub, err = importPublicKey(msg.RandomPubkey[:])
|
||||
return err
|
||||
}
|
||||
|
||||
func (h *encHandshake) makeAuthResp() (msg *authRespV4, err error) {
|
||||
// Generate random nonce.
|
||||
h.respNonce = make([]byte, shaLen)
|
||||
if _, err = rand.Read(h.respNonce); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
msg = new(authRespV4)
|
||||
copy(msg.Nonce[:], h.respNonce)
|
||||
copy(msg.RandomPubkey[:], exportPubkey(&h.randomPrivKey.PublicKey))
|
||||
msg.Version = 4
|
||||
return msg, nil
|
||||
}
|
||||
|
||||
func (msg *authMsgV4) decodePlain(input []byte) {
|
||||
n := copy(msg.Signature[:], input)
|
||||
n += shaLen // skip sha3(initiator-ephemeral-pubk)
|
||||
n += copy(msg.InitiatorPubkey[:], input[n:])
|
||||
copy(msg.Nonce[:], input[n:])
|
||||
msg.Version = 4
|
||||
msg.gotPlain = true
|
||||
}
|
||||
|
||||
func (msg *authRespV4) sealPlain(hs *encHandshake) ([]byte, error) {
|
||||
buf := make([]byte, authRespLen)
|
||||
n := copy(buf, msg.RandomPubkey[:])
|
||||
copy(buf[n:], msg.Nonce[:])
|
||||
return ecies.Encrypt(rand.Reader, hs.remote, buf, nil, nil)
|
||||
}
|
||||
|
||||
func (msg *authRespV4) decodePlain(input []byte) {
|
||||
n := copy(msg.RandomPubkey[:], input)
|
||||
copy(msg.Nonce[:], input[n:])
|
||||
msg.Version = 4
|
||||
}
|
||||
|
||||
var padSpace = make([]byte, 300)
|
||||
|
||||
func sealEIP8(msg interface{}, h *encHandshake) ([]byte, error) {
|
||||
buf := new(bytes.Buffer)
|
||||
if err := rlp.Encode(buf, msg); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// pad with random amount of data. the amount needs to be at least 100 bytes to make
|
||||
// the message distinguishable from pre-EIP-8 handshakes.
|
||||
pad := padSpace[:mrand.Intn(len(padSpace)-100)+100]
|
||||
buf.Write(pad)
|
||||
prefix := make([]byte, 2)
|
||||
binary.BigEndian.PutUint16(prefix, uint16(buf.Len()+eciesOverhead))
|
||||
|
||||
enc, err := ecies.Encrypt(rand.Reader, h.remote, buf.Bytes(), nil, prefix)
|
||||
return append(prefix, enc...), err
|
||||
}
|
||||
|
||||
type plainDecoder interface {
|
||||
decodePlain([]byte)
|
||||
}
|
||||
|
||||
func readHandshakeMsg(msg plainDecoder, plainSize int, prv *ecdsa.PrivateKey, r io.Reader) ([]byte, error) {
|
||||
buf := make([]byte, plainSize)
|
||||
if _, err := io.ReadFull(r, buf); err != nil {
|
||||
return buf, err
|
||||
}
|
||||
// Attempt decoding pre-EIP-8 "plain" format.
|
||||
key := ecies.ImportECDSA(prv)
|
||||
if dec, err := key.Decrypt(buf, nil, nil); err == nil {
|
||||
msg.decodePlain(dec)
|
||||
return buf, nil
|
||||
}
|
||||
// Could be EIP-8 format, try that.
|
||||
prefix := buf[:2]
|
||||
size := binary.BigEndian.Uint16(prefix)
|
||||
if size < uint16(plainSize) {
|
||||
return buf, fmt.Errorf("size underflow, need at least %d bytes", plainSize)
|
||||
}
|
||||
buf = append(buf, make([]byte, size-uint16(plainSize)+2)...)
|
||||
if _, err := io.ReadFull(r, buf[plainSize:]); err != nil {
|
||||
return buf, err
|
||||
}
|
||||
dec, err := key.Decrypt(buf[2:], nil, prefix)
|
||||
if err != nil {
|
||||
return buf, err
|
||||
}
|
||||
// Can't use rlp.DecodeBytes here because it rejects
|
||||
// trailing data (forward-compatibility).
|
||||
s := rlp.NewStream(bytes.NewReader(dec), 0)
|
||||
return buf, s.Decode(msg)
|
||||
}
|
||||
|
||||
// importPublicKey unmarshals 512 bit public keys.
|
||||
func importPublicKey(pubKey []byte) (*ecies.PublicKey, error) {
|
||||
var pubKey65 []byte
|
||||
switch len(pubKey) {
|
||||
case 64:
|
||||
// add 'uncompressed key' flag
|
||||
pubKey65 = append([]byte{0x04}, pubKey...)
|
||||
case 65:
|
||||
pubKey65 = pubKey
|
||||
default:
|
||||
return nil, fmt.Errorf("invalid public key length %v (expect 64/65)", len(pubKey))
|
||||
}
|
||||
// TODO: fewer pointless conversions
|
||||
pub, err := crypto.UnmarshalPubkey(pubKey65)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return ecies.ImportECDSAPublic(pub), nil
|
||||
}
|
||||
|
||||
func exportPubkey(pub *ecies.PublicKey) []byte {
|
||||
if pub == nil {
|
||||
panic("nil pubkey")
|
||||
}
|
||||
return elliptic.Marshal(pub.Curve, pub.X, pub.Y)[1:]
|
||||
}
|
||||
|
||||
func xor(one, other []byte) (xor []byte) {
|
||||
xor = make([]byte, len(one))
|
||||
for i := 0; i < len(one); i++ {
|
||||
xor[i] = one[i] ^ other[i]
|
||||
}
|
||||
return xor
|
||||
}
|
||||
406
p2p/rlpx/rlpx_test.go
Normal file
406
p2p/rlpx/rlpx_test.go
Normal file
@ -0,0 +1,406 @@
|
||||
// Copyright 2020 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package rlpx
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"crypto/ecdsa"
|
||||
"encoding/hex"
|
||||
"fmt"
|
||||
"io"
|
||||
"net"
|
||||
"reflect"
|
||||
"strings"
|
||||
"testing"
|
||||
|
||||
"github.com/davecgh/go-spew/spew"
|
||||
"github.com/ethereum/go-ethereum/crypto"
|
||||
"github.com/ethereum/go-ethereum/crypto/ecies"
|
||||
"github.com/ethereum/go-ethereum/rlp"
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
type message struct {
|
||||
code uint64
|
||||
data []byte
|
||||
err error
|
||||
}
|
||||
|
||||
func TestHandshake(t *testing.T) {
|
||||
p1, p2 := createPeers(t)
|
||||
p1.Close()
|
||||
p2.Close()
|
||||
}
|
||||
|
||||
// This test checks that messages can be sent and received through WriteMsg/ReadMsg.
|
||||
func TestReadWriteMsg(t *testing.T) {
|
||||
peer1, peer2 := createPeers(t)
|
||||
defer peer1.Close()
|
||||
defer peer2.Close()
|
||||
|
||||
testCode := uint64(23)
|
||||
testData := []byte("test")
|
||||
checkMsgReadWrite(t, peer1, peer2, testCode, testData)
|
||||
|
||||
t.Log("enabling snappy")
|
||||
peer1.SetSnappy(true)
|
||||
peer2.SetSnappy(true)
|
||||
checkMsgReadWrite(t, peer1, peer2, testCode, testData)
|
||||
}
|
||||
|
||||
func checkMsgReadWrite(t *testing.T, p1, p2 *Conn, msgCode uint64, msgData []byte) {
|
||||
// Set up the reader.
|
||||
ch := make(chan message, 1)
|
||||
go func() {
|
||||
var msg message
|
||||
msg.code, msg.data, _, msg.err = p1.Read()
|
||||
ch <- msg
|
||||
}()
|
||||
|
||||
// Write the message.
|
||||
_, err := p2.Write(msgCode, msgData)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// Check it was received correctly.
|
||||
msg := <-ch
|
||||
assert.Equal(t, msgCode, msg.code, "wrong message code returned from ReadMsg")
|
||||
assert.Equal(t, msgData, msg.data, "wrong message data returned from ReadMsg")
|
||||
}
|
||||
|
||||
func createPeers(t *testing.T) (peer1, peer2 *Conn) {
|
||||
conn1, conn2 := net.Pipe()
|
||||
key1, key2 := newkey(), newkey()
|
||||
peer1 = NewConn(conn1, &key2.PublicKey) // dialer
|
||||
peer2 = NewConn(conn2, nil) // listener
|
||||
doHandshake(t, peer1, peer2, key1, key2)
|
||||
return peer1, peer2
|
||||
}
|
||||
|
||||
func doHandshake(t *testing.T, peer1, peer2 *Conn, key1, key2 *ecdsa.PrivateKey) {
|
||||
keyChan := make(chan *ecdsa.PublicKey, 1)
|
||||
go func() {
|
||||
pubKey, err := peer2.Handshake(key2)
|
||||
if err != nil {
|
||||
t.Errorf("peer2 could not do handshake: %v", err)
|
||||
}
|
||||
keyChan <- pubKey
|
||||
}()
|
||||
|
||||
pubKey2, err := peer1.Handshake(key1)
|
||||
if err != nil {
|
||||
t.Errorf("peer1 could not do handshake: %v", err)
|
||||
}
|
||||
pubKey1 := <-keyChan
|
||||
|
||||
// Confirm the handshake was successful.
|
||||
if !reflect.DeepEqual(pubKey1, &key1.PublicKey) || !reflect.DeepEqual(pubKey2, &key2.PublicKey) {
|
||||
t.Fatal("unsuccessful handshake")
|
||||
}
|
||||
}
|
||||
|
||||
// This test checks the frame data of written messages.
|
||||
func TestFrameReadWrite(t *testing.T) {
|
||||
conn := NewConn(nil, nil)
|
||||
hash := fakeHash([]byte{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})
|
||||
conn.InitWithSecrets(Secrets{
|
||||
AES: crypto.Keccak256(),
|
||||
MAC: crypto.Keccak256(),
|
||||
IngressMAC: hash,
|
||||
EgressMAC: hash,
|
||||
})
|
||||
h := conn.handshake
|
||||
|
||||
golden := unhex(`
|
||||
00828ddae471818bb0bfa6b551d1cb42
|
||||
01010101010101010101010101010101
|
||||
ba628a4ba590cb43f7848f41c4382885
|
||||
01010101010101010101010101010101
|
||||
`)
|
||||
msgCode := uint64(8)
|
||||
msg := []uint{1, 2, 3, 4}
|
||||
msgEnc, _ := rlp.EncodeToBytes(msg)
|
||||
|
||||
// Check writeFrame. The frame that's written should be equal to the test vector.
|
||||
buf := new(bytes.Buffer)
|
||||
if err := h.writeFrame(buf, msgCode, msgEnc); err != nil {
|
||||
t.Fatalf("WriteMsg error: %v", err)
|
||||
}
|
||||
if !bytes.Equal(buf.Bytes(), golden) {
|
||||
t.Fatalf("output mismatch:\n got: %x\n want: %x", buf.Bytes(), golden)
|
||||
}
|
||||
|
||||
// Check readFrame on the test vector.
|
||||
content, err := h.readFrame(bytes.NewReader(golden))
|
||||
if err != nil {
|
||||
t.Fatalf("ReadMsg error: %v", err)
|
||||
}
|
||||
wantContent := unhex("08C401020304")
|
||||
if !bytes.Equal(content, wantContent) {
|
||||
t.Errorf("frame content mismatch:\ngot %x\nwant %x", content, wantContent)
|
||||
}
|
||||
}
|
||||
|
||||
type fakeHash []byte
|
||||
|
||||
func (fakeHash) Write(p []byte) (int, error) { return len(p), nil }
|
||||
func (fakeHash) Reset() {}
|
||||
func (fakeHash) BlockSize() int { return 0 }
|
||||
func (h fakeHash) Size() int { return len(h) }
|
||||
func (h fakeHash) Sum(b []byte) []byte { return append(b, h...) }
|
||||
|
||||
type handshakeAuthTest struct {
|
||||
input string
|
||||
isPlain bool
|
||||
wantVersion uint
|
||||
wantRest []rlp.RawValue
|
||||
}
|
||||
|
||||
var eip8HandshakeAuthTests = []handshakeAuthTest{
|
||||
// (Auth₁) RLPx v4 plain encoding
|
||||
{
|
||||
input: `
|
||||
048ca79ad18e4b0659fab4853fe5bc58eb83992980f4c9cc147d2aa31532efd29a3d3dc6a3d89eaf
|
||||
913150cfc777ce0ce4af2758bf4810235f6e6ceccfee1acc6b22c005e9e3a49d6448610a58e98744
|
||||
ba3ac0399e82692d67c1f58849050b3024e21a52c9d3b01d871ff5f210817912773e610443a9ef14
|
||||
2e91cdba0bd77b5fdf0769b05671fc35f83d83e4d3b0b000c6b2a1b1bba89e0fc51bf4e460df3105
|
||||
c444f14be226458940d6061c296350937ffd5e3acaceeaaefd3c6f74be8e23e0f45163cc7ebd7622
|
||||
0f0128410fd05250273156d548a414444ae2f7dea4dfca2d43c057adb701a715bf59f6fb66b2d1d2
|
||||
0f2c703f851cbf5ac47396d9ca65b6260bd141ac4d53e2de585a73d1750780db4c9ee4cd4d225173
|
||||
a4592ee77e2bd94d0be3691f3b406f9bba9b591fc63facc016bfa8
|
||||
`,
|
||||
isPlain: true,
|
||||
wantVersion: 4,
|
||||
},
|
||||
// (Auth₂) EIP-8 encoding
|
||||
{
|
||||
input: `
|
||||
01b304ab7578555167be8154d5cc456f567d5ba302662433674222360f08d5f1534499d3678b513b
|
||||
0fca474f3a514b18e75683032eb63fccb16c156dc6eb2c0b1593f0d84ac74f6e475f1b8d56116b84
|
||||
9634a8c458705bf83a626ea0384d4d7341aae591fae42ce6bd5c850bfe0b999a694a49bbbaf3ef6c
|
||||
da61110601d3b4c02ab6c30437257a6e0117792631a4b47c1d52fc0f8f89caadeb7d02770bf999cc
|
||||
147d2df3b62e1ffb2c9d8c125a3984865356266bca11ce7d3a688663a51d82defaa8aad69da39ab6
|
||||
d5470e81ec5f2a7a47fb865ff7cca21516f9299a07b1bc63ba56c7a1a892112841ca44b6e0034dee
|
||||
70c9adabc15d76a54f443593fafdc3b27af8059703f88928e199cb122362a4b35f62386da7caad09
|
||||
c001edaeb5f8a06d2b26fb6cb93c52a9fca51853b68193916982358fe1e5369e249875bb8d0d0ec3
|
||||
6f917bc5e1eafd5896d46bd61ff23f1a863a8a8dcd54c7b109b771c8e61ec9c8908c733c0263440e
|
||||
2aa067241aaa433f0bb053c7b31a838504b148f570c0ad62837129e547678c5190341e4f1693956c
|
||||
3bf7678318e2d5b5340c9e488eefea198576344afbdf66db5f51204a6961a63ce072c8926c
|
||||
`,
|
||||
wantVersion: 4,
|
||||
wantRest: []rlp.RawValue{},
|
||||
},
|
||||
// (Auth₃) RLPx v4 EIP-8 encoding with version 56, additional list elements
|
||||
{
|
||||
input: `
|
||||
01b8044c6c312173685d1edd268aa95e1d495474c6959bcdd10067ba4c9013df9e40ff45f5bfd6f7
|
||||
2471f93a91b493f8e00abc4b80f682973de715d77ba3a005a242eb859f9a211d93a347fa64b597bf
|
||||
280a6b88e26299cf263b01b8dfdb712278464fd1c25840b995e84d367d743f66c0e54a586725b7bb
|
||||
f12acca27170ae3283c1073adda4b6d79f27656993aefccf16e0d0409fe07db2dc398a1b7e8ee93b
|
||||
cd181485fd332f381d6a050fba4c7641a5112ac1b0b61168d20f01b479e19adf7fdbfa0905f63352
|
||||
bfc7e23cf3357657455119d879c78d3cf8c8c06375f3f7d4861aa02a122467e069acaf513025ff19
|
||||
6641f6d2810ce493f51bee9c966b15c5043505350392b57645385a18c78f14669cc4d960446c1757
|
||||
1b7c5d725021babbcd786957f3d17089c084907bda22c2b2675b4378b114c601d858802a55345a15
|
||||
116bc61da4193996187ed70d16730e9ae6b3bb8787ebcaea1871d850997ddc08b4f4ea668fbf3740
|
||||
7ac044b55be0908ecb94d4ed172ece66fd31bfdadf2b97a8bc690163ee11f5b575a4b44e36e2bfb2
|
||||
f0fce91676fd64c7773bac6a003f481fddd0bae0a1f31aa27504e2a533af4cef3b623f4791b2cca6
|
||||
d490
|
||||
`,
|
||||
wantVersion: 56,
|
||||
wantRest: []rlp.RawValue{{0x01}, {0x02}, {0xC2, 0x04, 0x05}},
|
||||
},
|
||||
}
|
||||
|
||||
type handshakeAckTest struct {
|
||||
input string
|
||||
wantVersion uint
|
||||
wantRest []rlp.RawValue
|
||||
}
|
||||
|
||||
var eip8HandshakeRespTests = []handshakeAckTest{
|
||||
// (Ack₁) RLPx v4 plain encoding
|
||||
{
|
||||
input: `
|
||||
049f8abcfa9c0dc65b982e98af921bc0ba6e4243169348a236abe9df5f93aa69d99cadddaa387662
|
||||
b0ff2c08e9006d5a11a278b1b3331e5aaabf0a32f01281b6f4ede0e09a2d5f585b26513cb794d963
|
||||
5a57563921c04a9090b4f14ee42be1a5461049af4ea7a7f49bf4c97a352d39c8d02ee4acc416388c
|
||||
1c66cec761d2bc1c72da6ba143477f049c9d2dde846c252c111b904f630ac98e51609b3b1f58168d
|
||||
dca6505b7196532e5f85b259a20c45e1979491683fee108e9660edbf38f3add489ae73e3dda2c71b
|
||||
d1497113d5c755e942d1
|
||||
`,
|
||||
wantVersion: 4,
|
||||
},
|
||||
// (Ack₂) EIP-8 encoding
|
||||
{
|
||||
input: `
|
||||
01ea0451958701280a56482929d3b0757da8f7fbe5286784beead59d95089c217c9b917788989470
|
||||
b0e330cc6e4fb383c0340ed85fab836ec9fb8a49672712aeabbdfd1e837c1ff4cace34311cd7f4de
|
||||
05d59279e3524ab26ef753a0095637ac88f2b499b9914b5f64e143eae548a1066e14cd2f4bd7f814
|
||||
c4652f11b254f8a2d0191e2f5546fae6055694aed14d906df79ad3b407d94692694e259191cde171
|
||||
ad542fc588fa2b7333313d82a9f887332f1dfc36cea03f831cb9a23fea05b33deb999e85489e645f
|
||||
6aab1872475d488d7bd6c7c120caf28dbfc5d6833888155ed69d34dbdc39c1f299be1057810f34fb
|
||||
e754d021bfca14dc989753d61c413d261934e1a9c67ee060a25eefb54e81a4d14baff922180c395d
|
||||
3f998d70f46f6b58306f969627ae364497e73fc27f6d17ae45a413d322cb8814276be6ddd13b885b
|
||||
201b943213656cde498fa0e9ddc8e0b8f8a53824fbd82254f3e2c17e8eaea009c38b4aa0a3f306e8
|
||||
797db43c25d68e86f262e564086f59a2fc60511c42abfb3057c247a8a8fe4fb3ccbadde17514b7ac
|
||||
8000cdb6a912778426260c47f38919a91f25f4b5ffb455d6aaaf150f7e5529c100ce62d6d92826a7
|
||||
1778d809bdf60232ae21ce8a437eca8223f45ac37f6487452ce626f549b3b5fdee26afd2072e4bc7
|
||||
5833c2464c805246155289f4
|
||||
`,
|
||||
wantVersion: 4,
|
||||
wantRest: []rlp.RawValue{},
|
||||
},
|
||||
// (Ack₃) EIP-8 encoding with version 57, additional list elements
|
||||
{
|
||||
input: `
|
||||
01f004076e58aae772bb101ab1a8e64e01ee96e64857ce82b1113817c6cdd52c09d26f7b90981cd7
|
||||
ae835aeac72e1573b8a0225dd56d157a010846d888dac7464baf53f2ad4e3d584531fa203658fab0
|
||||
3a06c9fd5e35737e417bc28c1cbf5e5dfc666de7090f69c3b29754725f84f75382891c561040ea1d
|
||||
dc0d8f381ed1b9d0d4ad2a0ec021421d847820d6fa0ba66eaf58175f1b235e851c7e2124069fbc20
|
||||
2888ddb3ac4d56bcbd1b9b7eab59e78f2e2d400905050f4a92dec1c4bdf797b3fc9b2f8e84a482f3
|
||||
d800386186712dae00d5c386ec9387a5e9c9a1aca5a573ca91082c7d68421f388e79127a5177d4f8
|
||||
590237364fd348c9611fa39f78dcdceee3f390f07991b7b47e1daa3ebcb6ccc9607811cb17ce51f1
|
||||
c8c2c5098dbdd28fca547b3f58c01a424ac05f869f49c6a34672ea2cbbc558428aa1fe48bbfd6115
|
||||
8b1b735a65d99f21e70dbc020bfdface9f724a0d1fb5895db971cc81aa7608baa0920abb0a565c9c
|
||||
436e2fd13323428296c86385f2384e408a31e104670df0791d93e743a3a5194ee6b076fb6323ca59
|
||||
3011b7348c16cf58f66b9633906ba54a2ee803187344b394f75dd2e663a57b956cb830dd7a908d4f
|
||||
39a2336a61ef9fda549180d4ccde21514d117b6c6fd07a9102b5efe710a32af4eeacae2cb3b1dec0
|
||||
35b9593b48b9d3ca4c13d245d5f04169b0b1
|
||||
`,
|
||||
wantVersion: 57,
|
||||
wantRest: []rlp.RawValue{{0x06}, {0xC2, 0x07, 0x08}, {0x81, 0xFA}},
|
||||
},
|
||||
}
|
||||
|
||||
func TestHandshakeForwardCompatibility(t *testing.T) {
|
||||
var (
|
||||
keyA, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
|
||||
keyB, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
|
||||
pubA = crypto.FromECDSAPub(&keyA.PublicKey)[1:]
|
||||
pubB = crypto.FromECDSAPub(&keyB.PublicKey)[1:]
|
||||
ephA, _ = crypto.HexToECDSA("869d6ecf5211f1cc60418a13b9d870b22959d0c16f02bec714c960dd2298a32d")
|
||||
ephB, _ = crypto.HexToECDSA("e238eb8e04fee6511ab04c6dd3c89ce097b11f25d584863ac2b6d5b35b1847e4")
|
||||
ephPubA = crypto.FromECDSAPub(&ephA.PublicKey)[1:]
|
||||
ephPubB = crypto.FromECDSAPub(&ephB.PublicKey)[1:]
|
||||
nonceA = unhex("7e968bba13b6c50e2c4cd7f241cc0d64d1ac25c7f5952df231ac6a2bda8ee5d6")
|
||||
nonceB = unhex("559aead08264d5795d3909718cdd05abd49572e84fe55590eef31a88a08fdffd")
|
||||
_, _, _, _ = pubA, pubB, ephPubA, ephPubB
|
||||
authSignature = unhex("299ca6acfd35e3d72d8ba3d1e2b60b5561d5af5218eb5bc182045769eb4226910a301acae3b369fffc4a4899d6b02531e89fd4fe36a2cf0d93607ba470b50f7800")
|
||||
_ = authSignature
|
||||
)
|
||||
makeAuth := func(test handshakeAuthTest) *authMsgV4 {
|
||||
msg := &authMsgV4{Version: test.wantVersion, Rest: test.wantRest, gotPlain: test.isPlain}
|
||||
copy(msg.Signature[:], authSignature)
|
||||
copy(msg.InitiatorPubkey[:], pubA)
|
||||
copy(msg.Nonce[:], nonceA)
|
||||
return msg
|
||||
}
|
||||
makeAck := func(test handshakeAckTest) *authRespV4 {
|
||||
msg := &authRespV4{Version: test.wantVersion, Rest: test.wantRest}
|
||||
copy(msg.RandomPubkey[:], ephPubB)
|
||||
copy(msg.Nonce[:], nonceB)
|
||||
return msg
|
||||
}
|
||||
|
||||
// check auth msg parsing
|
||||
for _, test := range eip8HandshakeAuthTests {
|
||||
r := bytes.NewReader(unhex(test.input))
|
||||
msg := new(authMsgV4)
|
||||
ciphertext, err := readHandshakeMsg(msg, encAuthMsgLen, keyB, r)
|
||||
if err != nil {
|
||||
t.Errorf("error for input %x:\n %v", unhex(test.input), err)
|
||||
continue
|
||||
}
|
||||
if !bytes.Equal(ciphertext, unhex(test.input)) {
|
||||
t.Errorf("wrong ciphertext for input %x:\n %x", unhex(test.input), ciphertext)
|
||||
}
|
||||
want := makeAuth(test)
|
||||
if !reflect.DeepEqual(msg, want) {
|
||||
t.Errorf("wrong msg for input %x:\ngot %s\nwant %s", unhex(test.input), spew.Sdump(msg), spew.Sdump(want))
|
||||
}
|
||||
}
|
||||
|
||||
// check auth resp parsing
|
||||
for _, test := range eip8HandshakeRespTests {
|
||||
input := unhex(test.input)
|
||||
r := bytes.NewReader(input)
|
||||
msg := new(authRespV4)
|
||||
ciphertext, err := readHandshakeMsg(msg, encAuthRespLen, keyA, r)
|
||||
if err != nil {
|
||||
t.Errorf("error for input %x:\n %v", input, err)
|
||||
continue
|
||||
}
|
||||
if !bytes.Equal(ciphertext, input) {
|
||||
t.Errorf("wrong ciphertext for input %x:\n %x", input, err)
|
||||
}
|
||||
want := makeAck(test)
|
||||
if !reflect.DeepEqual(msg, want) {
|
||||
t.Errorf("wrong msg for input %x:\ngot %s\nwant %s", input, spew.Sdump(msg), spew.Sdump(want))
|
||||
}
|
||||
}
|
||||
|
||||
// check derivation for (Auth₂, Ack₂) on recipient side
|
||||
var (
|
||||
hs = &encHandshake{
|
||||
initiator: false,
|
||||
respNonce: nonceB,
|
||||
randomPrivKey: ecies.ImportECDSA(ephB),
|
||||
}
|
||||
authCiphertext = unhex(eip8HandshakeAuthTests[1].input)
|
||||
authRespCiphertext = unhex(eip8HandshakeRespTests[1].input)
|
||||
authMsg = makeAuth(eip8HandshakeAuthTests[1])
|
||||
wantAES = unhex("80e8632c05fed6fc2a13b0f8d31a3cf645366239170ea067065aba8e28bac487")
|
||||
wantMAC = unhex("2ea74ec5dae199227dff1af715362700e989d889d7a493cb0639691efb8e5f98")
|
||||
wantFooIngressHash = unhex("0c7ec6340062cc46f5e9f1e3cf86f8c8c403c5a0964f5df0ebd34a75ddc86db5")
|
||||
)
|
||||
if err := hs.handleAuthMsg(authMsg, keyB); err != nil {
|
||||
t.Fatalf("handleAuthMsg: %v", err)
|
||||
}
|
||||
derived, err := hs.secrets(authCiphertext, authRespCiphertext)
|
||||
if err != nil {
|
||||
t.Fatalf("secrets: %v", err)
|
||||
}
|
||||
if !bytes.Equal(derived.AES, wantAES) {
|
||||
t.Errorf("aes-secret mismatch:\ngot %x\nwant %x", derived.AES, wantAES)
|
||||
}
|
||||
if !bytes.Equal(derived.MAC, wantMAC) {
|
||||
t.Errorf("mac-secret mismatch:\ngot %x\nwant %x", derived.MAC, wantMAC)
|
||||
}
|
||||
io.WriteString(derived.IngressMAC, "foo")
|
||||
fooIngressHash := derived.IngressMAC.Sum(nil)
|
||||
if !bytes.Equal(fooIngressHash, wantFooIngressHash) {
|
||||
t.Errorf("ingress-mac('foo') mismatch:\ngot %x\nwant %x", fooIngressHash, wantFooIngressHash)
|
||||
}
|
||||
}
|
||||
|
||||
func unhex(str string) []byte {
|
||||
r := strings.NewReplacer("\t", "", " ", "", "\n", "")
|
||||
b, err := hex.DecodeString(r.Replace(str))
|
||||
if err != nil {
|
||||
panic(fmt.Sprintf("invalid hex string: %q", str))
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
func newkey() *ecdsa.PrivateKey {
|
||||
key, err := crypto.GenerateKey()
|
||||
if err != nil {
|
||||
panic("couldn't generate key: " + err.Error())
|
||||
}
|
||||
return key
|
||||
}
|
||||
Reference in New Issue
Block a user