637 lines
19 KiB
Go
637 lines
19 KiB
Go
// Copyright 2019 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 v5wire
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/hex"
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"flag"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"path/filepath"
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"reflect"
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"strings"
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"testing"
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"github.com/davecgh/go-spew/spew"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/p2p/enode"
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)
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// To regenerate discv5 test vectors, run
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//
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// go test -run TestVectors -write-test-vectors
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//
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var writeTestVectorsFlag = flag.Bool("write-test-vectors", false, "Overwrite discv5 test vectors in testdata/")
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var (
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testKeyA, _ = crypto.HexToECDSA("eef77acb6c6a6eebc5b363a475ac583ec7eccdb42b6481424c60f59aa326547f")
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testKeyB, _ = crypto.HexToECDSA("66fb62bfbd66b9177a138c1e5cddbe4f7c30c343e94e68df8769459cb1cde628")
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testEphKey, _ = crypto.HexToECDSA("0288ef00023598499cb6c940146d050d2b1fb914198c327f76aad590bead68b6")
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testIDnonce = [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
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)
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// This test checks that the minPacketSize and randomPacketMsgSize constants are well-defined.
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func TestMinSizes(t *testing.T) {
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var (
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gcmTagSize = 16
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emptyMsg = sizeofMessageAuthData + gcmTagSize
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)
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t.Log("static header size", sizeofStaticPacketData)
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t.Log("whoareyou size", sizeofStaticPacketData+sizeofWhoareyouAuthData)
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t.Log("empty msg size", sizeofStaticPacketData+emptyMsg)
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if want := emptyMsg; minMessageSize != want {
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t.Fatalf("wrong minMessageSize %d, want %d", minMessageSize, want)
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}
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if sizeofMessageAuthData+randomPacketMsgSize < minMessageSize {
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t.Fatalf("randomPacketMsgSize %d too small", randomPacketMsgSize)
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}
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}
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// This test checks the basic handshake flow where A talks to B and A has no secrets.
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func TestHandshake(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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// A -> B RANDOM PACKET
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packet, _ := net.nodeA.encode(t, net.nodeB, &Findnode{})
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resp := net.nodeB.expectDecode(t, UnknownPacket, packet)
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// A <- B WHOAREYOU
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challenge := &Whoareyou{
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Nonce: resp.(*Unknown).Nonce,
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IDNonce: testIDnonce,
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RecordSeq: 0,
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}
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whoareyou, _ := net.nodeB.encode(t, net.nodeA, challenge)
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net.nodeA.expectDecode(t, WhoareyouPacket, whoareyou)
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// A -> B FINDNODE (handshake packet)
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findnode, _ := net.nodeA.encodeWithChallenge(t, net.nodeB, challenge, &Findnode{})
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net.nodeB.expectDecode(t, FindnodeMsg, findnode)
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if len(net.nodeB.c.sc.handshakes) > 0 {
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t.Fatalf("node B didn't remove handshake from challenge map")
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}
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// A <- B NODES
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nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
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net.nodeA.expectDecode(t, NodesMsg, nodes)
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}
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// This test checks that handshake attempts are removed within the timeout.
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func TestHandshake_timeout(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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// A -> B RANDOM PACKET
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packet, _ := net.nodeA.encode(t, net.nodeB, &Findnode{})
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resp := net.nodeB.expectDecode(t, UnknownPacket, packet)
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// A <- B WHOAREYOU
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challenge := &Whoareyou{
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Nonce: resp.(*Unknown).Nonce,
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IDNonce: testIDnonce,
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RecordSeq: 0,
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}
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whoareyou, _ := net.nodeB.encode(t, net.nodeA, challenge)
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net.nodeA.expectDecode(t, WhoareyouPacket, whoareyou)
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// A -> B FINDNODE (handshake packet) after timeout
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net.clock.Run(handshakeTimeout + 1)
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findnode, _ := net.nodeA.encodeWithChallenge(t, net.nodeB, challenge, &Findnode{})
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net.nodeB.expectDecodeErr(t, errUnexpectedHandshake, findnode)
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}
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// This test checks handshake behavior when no record is sent in the auth response.
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func TestHandshake_norecord(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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// A -> B RANDOM PACKET
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packet, _ := net.nodeA.encode(t, net.nodeB, &Findnode{})
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resp := net.nodeB.expectDecode(t, UnknownPacket, packet)
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// A <- B WHOAREYOU
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nodeA := net.nodeA.n()
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if nodeA.Seq() == 0 {
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t.Fatal("need non-zero sequence number")
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}
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challenge := &Whoareyou{
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Nonce: resp.(*Unknown).Nonce,
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IDNonce: testIDnonce,
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RecordSeq: nodeA.Seq(),
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Node: nodeA,
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}
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whoareyou, _ := net.nodeB.encode(t, net.nodeA, challenge)
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net.nodeA.expectDecode(t, WhoareyouPacket, whoareyou)
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// A -> B FINDNODE
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findnode, _ := net.nodeA.encodeWithChallenge(t, net.nodeB, challenge, &Findnode{})
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net.nodeB.expectDecode(t, FindnodeMsg, findnode)
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// A <- B NODES
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nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
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net.nodeA.expectDecode(t, NodesMsg, nodes)
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}
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// In this test, A tries to send FINDNODE with existing secrets but B doesn't know
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// anything about A.
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func TestHandshake_rekey(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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session := &session{
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readKey: []byte("BBBBBBBBBBBBBBBB"),
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writeKey: []byte("AAAAAAAAAAAAAAAA"),
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}
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net.nodeA.c.sc.storeNewSession(net.nodeB.id(), net.nodeB.addr(), session)
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// A -> B FINDNODE (encrypted with zero keys)
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findnode, authTag := net.nodeA.encode(t, net.nodeB, &Findnode{})
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net.nodeB.expectDecode(t, UnknownPacket, findnode)
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// A <- B WHOAREYOU
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challenge := &Whoareyou{Nonce: authTag, IDNonce: testIDnonce}
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whoareyou, _ := net.nodeB.encode(t, net.nodeA, challenge)
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net.nodeA.expectDecode(t, WhoareyouPacket, whoareyou)
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// Check that new keys haven't been stored yet.
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sa := net.nodeA.c.sc.session(net.nodeB.id(), net.nodeB.addr())
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if !bytes.Equal(sa.writeKey, session.writeKey) || !bytes.Equal(sa.readKey, session.readKey) {
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t.Fatal("node A stored keys too early")
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}
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if s := net.nodeB.c.sc.session(net.nodeA.id(), net.nodeA.addr()); s != nil {
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t.Fatal("node B stored keys too early")
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}
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// A -> B FINDNODE encrypted with new keys
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findnode, _ = net.nodeA.encodeWithChallenge(t, net.nodeB, challenge, &Findnode{})
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net.nodeB.expectDecode(t, FindnodeMsg, findnode)
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// A <- B NODES
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nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
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net.nodeA.expectDecode(t, NodesMsg, nodes)
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}
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// In this test A and B have different keys before the handshake.
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func TestHandshake_rekey2(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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initKeysA := &session{
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readKey: []byte("BBBBBBBBBBBBBBBB"),
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writeKey: []byte("AAAAAAAAAAAAAAAA"),
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}
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initKeysB := &session{
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readKey: []byte("CCCCCCCCCCCCCCCC"),
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writeKey: []byte("DDDDDDDDDDDDDDDD"),
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}
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net.nodeA.c.sc.storeNewSession(net.nodeB.id(), net.nodeB.addr(), initKeysA)
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net.nodeB.c.sc.storeNewSession(net.nodeA.id(), net.nodeA.addr(), initKeysB)
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// A -> B FINDNODE encrypted with initKeysA
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findnode, authTag := net.nodeA.encode(t, net.nodeB, &Findnode{Distances: []uint{3}})
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net.nodeB.expectDecode(t, UnknownPacket, findnode)
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// A <- B WHOAREYOU
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challenge := &Whoareyou{Nonce: authTag, IDNonce: testIDnonce}
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whoareyou, _ := net.nodeB.encode(t, net.nodeA, challenge)
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net.nodeA.expectDecode(t, WhoareyouPacket, whoareyou)
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// A -> B FINDNODE (handshake packet)
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findnode, _ = net.nodeA.encodeWithChallenge(t, net.nodeB, challenge, &Findnode{})
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net.nodeB.expectDecode(t, FindnodeMsg, findnode)
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// A <- B NODES
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nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
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net.nodeA.expectDecode(t, NodesMsg, nodes)
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}
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func TestHandshake_BadHandshakeAttack(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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// A -> B RANDOM PACKET
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packet, _ := net.nodeA.encode(t, net.nodeB, &Findnode{})
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resp := net.nodeB.expectDecode(t, UnknownPacket, packet)
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// A <- B WHOAREYOU
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challenge := &Whoareyou{
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Nonce: resp.(*Unknown).Nonce,
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IDNonce: testIDnonce,
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RecordSeq: 0,
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}
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whoareyou, _ := net.nodeB.encode(t, net.nodeA, challenge)
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net.nodeA.expectDecode(t, WhoareyouPacket, whoareyou)
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// A -> B FINDNODE
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incorrect_challenge := &Whoareyou{
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IDNonce: [16]byte{5, 6, 7, 8, 9, 6, 11, 12},
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RecordSeq: challenge.RecordSeq,
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Node: challenge.Node,
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sent: challenge.sent,
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}
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incorrect_findnode, _ := net.nodeA.encodeWithChallenge(t, net.nodeB, incorrect_challenge, &Findnode{})
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incorrect_findnode2 := make([]byte, len(incorrect_findnode))
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copy(incorrect_findnode2, incorrect_findnode)
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net.nodeB.expectDecodeErr(t, errInvalidNonceSig, incorrect_findnode)
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// Reject new findnode as previous handshake is now deleted.
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net.nodeB.expectDecodeErr(t, errUnexpectedHandshake, incorrect_findnode2)
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// The findnode packet is again rejected even with a valid challenge this time.
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findnode, _ := net.nodeA.encodeWithChallenge(t, net.nodeB, challenge, &Findnode{})
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net.nodeB.expectDecodeErr(t, errUnexpectedHandshake, findnode)
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}
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// This test checks some malformed packets.
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func TestDecodeErrorsV5(t *testing.T) {
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t.Parallel()
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net := newHandshakeTest()
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defer net.close()
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net.nodeA.expectDecodeErr(t, errTooShort, []byte{})
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// TODO some more tests would be nice :)
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// - check invalid authdata sizes
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// - check invalid handshake data sizes
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}
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// This test checks that all test vectors can be decoded.
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func TestTestVectorsV5(t *testing.T) {
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var (
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idA = enode.PubkeyToIDV4(&testKeyA.PublicKey)
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idB = enode.PubkeyToIDV4(&testKeyB.PublicKey)
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addr = "127.0.0.1"
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session = &session{
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writeKey: hexutil.MustDecode("0x00000000000000000000000000000000"),
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readKey: hexutil.MustDecode("0x01010101010101010101010101010101"),
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}
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challenge0A, challenge1A, challenge0B Whoareyou
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)
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// Create challenge packets.
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c := Whoareyou{
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Nonce: Nonce{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12},
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IDNonce: testIDnonce,
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}
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challenge0A, challenge1A, challenge0B = c, c, c
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challenge1A.RecordSeq = 1
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net := newHandshakeTest()
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challenge0A.Node = net.nodeA.n()
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challenge0B.Node = net.nodeB.n()
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challenge1A.Node = net.nodeA.n()
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net.close()
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type testVectorTest struct {
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name string // test vector name
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packet Packet // the packet to be encoded
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challenge *Whoareyou // handshake challenge passed to encoder
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prep func(*handshakeTest) // called before encode/decode
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}
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tests := []testVectorTest{
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{
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name: "v5.1-whoareyou",
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packet: &challenge0B,
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},
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{
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name: "v5.1-ping-message",
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packet: &Ping{
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ReqID: []byte{0, 0, 0, 1},
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ENRSeq: 2,
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},
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prep: func(net *handshakeTest) {
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net.nodeA.c.sc.storeNewSession(idB, addr, session)
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net.nodeB.c.sc.storeNewSession(idA, addr, session.keysFlipped())
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},
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},
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{
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name: "v5.1-ping-handshake-enr",
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packet: &Ping{
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ReqID: []byte{0, 0, 0, 1},
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ENRSeq: 1,
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},
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challenge: &challenge0A,
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prep: func(net *handshakeTest) {
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// Update challenge.Header.AuthData.
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net.nodeA.c.Encode(idB, "", &challenge0A, nil)
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net.nodeB.c.sc.storeSentHandshake(idA, addr, &challenge0A)
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},
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},
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{
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name: "v5.1-ping-handshake",
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packet: &Ping{
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ReqID: []byte{0, 0, 0, 1},
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ENRSeq: 1,
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},
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challenge: &challenge1A,
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prep: func(net *handshakeTest) {
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// Update challenge data.
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net.nodeA.c.Encode(idB, "", &challenge1A, nil)
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net.nodeB.c.sc.storeSentHandshake(idA, addr, &challenge1A)
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},
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},
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}
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for _, test := range tests {
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test := test
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t.Run(test.name, func(t *testing.T) {
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net := newHandshakeTest()
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defer net.close()
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// Override all random inputs.
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net.nodeA.c.sc.nonceGen = func(counter uint32) (Nonce, error) {
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return Nonce{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, nil
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}
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net.nodeA.c.sc.maskingIVGen = func(buf []byte) error {
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return nil // all zero
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}
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net.nodeA.c.sc.ephemeralKeyGen = func() (*ecdsa.PrivateKey, error) {
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return testEphKey, nil
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}
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// Prime the codec for encoding/decoding.
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if test.prep != nil {
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test.prep(net)
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}
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file := filepath.Join("testdata", test.name+".txt")
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if *writeTestVectorsFlag {
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// Encode the packet.
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d, nonce := net.nodeA.encodeWithChallenge(t, net.nodeB, test.challenge, test.packet)
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comment := testVectorComment(net, test.packet, test.challenge, nonce)
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writeTestVector(file, comment, d)
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}
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enc := hexFile(file)
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net.nodeB.expectDecode(t, test.packet.Kind(), enc)
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})
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}
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}
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// testVectorComment creates the commentary for discv5 test vector files.
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func testVectorComment(net *handshakeTest, p Packet, challenge *Whoareyou, nonce Nonce) string {
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o := new(strings.Builder)
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printWhoareyou := func(p *Whoareyou) {
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fmt.Fprintf(o, "whoareyou.challenge-data = %#x\n", p.ChallengeData)
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fmt.Fprintf(o, "whoareyou.request-nonce = %#x\n", p.Nonce[:])
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fmt.Fprintf(o, "whoareyou.id-nonce = %#x\n", p.IDNonce[:])
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fmt.Fprintf(o, "whoareyou.enr-seq = %d\n", p.RecordSeq)
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}
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fmt.Fprintf(o, "src-node-id = %#x\n", net.nodeA.id().Bytes())
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fmt.Fprintf(o, "dest-node-id = %#x\n", net.nodeB.id().Bytes())
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switch p := p.(type) {
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case *Whoareyou:
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// WHOAREYOU packet.
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printWhoareyou(p)
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case *Ping:
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fmt.Fprintf(o, "nonce = %#x\n", nonce[:])
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fmt.Fprintf(o, "read-key = %#x\n", net.nodeA.c.sc.session(net.nodeB.id(), net.nodeB.addr()).writeKey)
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fmt.Fprintf(o, "ping.req-id = %#x\n", p.ReqID)
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fmt.Fprintf(o, "ping.enr-seq = %d\n", p.ENRSeq)
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if challenge != nil {
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// Handshake message packet.
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fmt.Fprint(o, "\nhandshake inputs:\n\n")
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printWhoareyou(challenge)
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fmt.Fprintf(o, "ephemeral-key = %#x\n", testEphKey.D.Bytes())
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fmt.Fprintf(o, "ephemeral-pubkey = %#x\n", crypto.CompressPubkey(&testEphKey.PublicKey))
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}
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default:
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panic(fmt.Errorf("unhandled packet type %T", p))
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}
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return o.String()
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}
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// This benchmark checks performance of handshake packet decoding.
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func BenchmarkV5_DecodeHandshakePingSecp256k1(b *testing.B) {
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net := newHandshakeTest()
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defer net.close()
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var (
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idA = net.nodeA.id()
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challenge = &Whoareyou{Node: net.nodeB.n()}
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message = &Ping{ReqID: []byte("reqid")}
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)
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enc, _, err := net.nodeA.c.Encode(net.nodeB.id(), "", message, challenge)
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if err != nil {
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b.Fatal("can't encode handshake packet")
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}
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challenge.Node = nil // force ENR signature verification in decoder
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b.ResetTimer()
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input := make([]byte, len(enc))
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|
for i := 0; i < b.N; i++ {
|
|
copy(input, enc)
|
|
net.nodeB.c.sc.storeSentHandshake(idA, "", challenge)
|
|
_, _, _, err := net.nodeB.c.Decode(input, "")
|
|
if err != nil {
|
|
b.Fatal(err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// This benchmark checks how long it takes to decode an encrypted ping packet.
|
|
func BenchmarkV5_DecodePing(b *testing.B) {
|
|
net := newHandshakeTest()
|
|
defer net.close()
|
|
|
|
session := &session{
|
|
readKey: []byte{233, 203, 93, 195, 86, 47, 177, 186, 227, 43, 2, 141, 244, 230, 120, 17},
|
|
writeKey: []byte{79, 145, 252, 171, 167, 216, 252, 161, 208, 190, 176, 106, 214, 39, 178, 134},
|
|
}
|
|
net.nodeA.c.sc.storeNewSession(net.nodeB.id(), net.nodeB.addr(), session)
|
|
net.nodeB.c.sc.storeNewSession(net.nodeA.id(), net.nodeA.addr(), session.keysFlipped())
|
|
addrB := net.nodeA.addr()
|
|
ping := &Ping{ReqID: []byte("reqid"), ENRSeq: 5}
|
|
enc, _, err := net.nodeA.c.Encode(net.nodeB.id(), addrB, ping, nil)
|
|
if err != nil {
|
|
b.Fatalf("can't encode: %v", err)
|
|
}
|
|
b.ResetTimer()
|
|
|
|
input := make([]byte, len(enc))
|
|
for i := 0; i < b.N; i++ {
|
|
copy(input, enc)
|
|
_, _, packet, _ := net.nodeB.c.Decode(input, addrB)
|
|
if _, ok := packet.(*Ping); !ok {
|
|
b.Fatalf("wrong packet type %T", packet)
|
|
}
|
|
}
|
|
}
|
|
|
|
var pp = spew.NewDefaultConfig()
|
|
|
|
type handshakeTest struct {
|
|
nodeA, nodeB handshakeTestNode
|
|
clock mclock.Simulated
|
|
}
|
|
|
|
type handshakeTestNode struct {
|
|
ln *enode.LocalNode
|
|
c *Codec
|
|
}
|
|
|
|
func newHandshakeTest() *handshakeTest {
|
|
t := new(handshakeTest)
|
|
t.nodeA.init(testKeyA, net.IP{127, 0, 0, 1}, &t.clock)
|
|
t.nodeB.init(testKeyB, net.IP{127, 0, 0, 1}, &t.clock)
|
|
return t
|
|
}
|
|
|
|
func (t *handshakeTest) close() {
|
|
t.nodeA.ln.Database().Close()
|
|
t.nodeB.ln.Database().Close()
|
|
}
|
|
|
|
func (n *handshakeTestNode) init(key *ecdsa.PrivateKey, ip net.IP, clock mclock.Clock) {
|
|
db, _ := enode.OpenDB("")
|
|
n.ln = enode.NewLocalNode(db, key)
|
|
n.ln.SetStaticIP(ip)
|
|
if n.ln.Node().Seq() != 1 {
|
|
panic(fmt.Errorf("unexpected seq %d", n.ln.Node().Seq()))
|
|
}
|
|
n.c = NewCodec(n.ln, key, clock)
|
|
}
|
|
|
|
func (n *handshakeTestNode) encode(t testing.TB, to handshakeTestNode, p Packet) ([]byte, Nonce) {
|
|
t.Helper()
|
|
return n.encodeWithChallenge(t, to, nil, p)
|
|
}
|
|
|
|
func (n *handshakeTestNode) encodeWithChallenge(t testing.TB, to handshakeTestNode, c *Whoareyou, p Packet) ([]byte, Nonce) {
|
|
t.Helper()
|
|
|
|
// Copy challenge and add destination node. This avoids sharing 'c' among the two codecs.
|
|
var challenge *Whoareyou
|
|
if c != nil {
|
|
challengeCopy := *c
|
|
challenge = &challengeCopy
|
|
challenge.Node = to.n()
|
|
}
|
|
// Encode to destination.
|
|
enc, nonce, err := n.c.Encode(to.id(), to.addr(), p, challenge)
|
|
if err != nil {
|
|
t.Fatal(fmt.Errorf("(%s) %v", n.ln.ID().TerminalString(), err))
|
|
}
|
|
t.Logf("(%s) -> (%s) %s\n%s", n.ln.ID().TerminalString(), to.id().TerminalString(), p.Name(), hex.Dump(enc))
|
|
return enc, nonce
|
|
}
|
|
|
|
func (n *handshakeTestNode) expectDecode(t *testing.T, ptype byte, p []byte) Packet {
|
|
t.Helper()
|
|
|
|
dec, err := n.decode(p)
|
|
if err != nil {
|
|
t.Fatal(fmt.Errorf("(%s) %v", n.ln.ID().TerminalString(), err))
|
|
}
|
|
t.Logf("(%s) %#v", n.ln.ID().TerminalString(), pp.NewFormatter(dec))
|
|
if dec.Kind() != ptype {
|
|
t.Fatalf("expected packet type %d, got %d", ptype, dec.Kind())
|
|
}
|
|
return dec
|
|
}
|
|
|
|
func (n *handshakeTestNode) expectDecodeErr(t *testing.T, wantErr error, p []byte) {
|
|
t.Helper()
|
|
if _, err := n.decode(p); !reflect.DeepEqual(err, wantErr) {
|
|
t.Fatal(fmt.Errorf("(%s) got err %q, want %q", n.ln.ID().TerminalString(), err, wantErr))
|
|
}
|
|
}
|
|
|
|
func (n *handshakeTestNode) decode(input []byte) (Packet, error) {
|
|
_, _, p, err := n.c.Decode(input, "127.0.0.1")
|
|
return p, err
|
|
}
|
|
|
|
func (n *handshakeTestNode) n() *enode.Node {
|
|
return n.ln.Node()
|
|
}
|
|
|
|
func (n *handshakeTestNode) addr() string {
|
|
return n.ln.Node().IP().String()
|
|
}
|
|
|
|
func (n *handshakeTestNode) id() enode.ID {
|
|
return n.ln.ID()
|
|
}
|
|
|
|
// hexFile reads the given file and decodes the hex data contained in it.
|
|
// Whitespace and any lines beginning with the # character are ignored.
|
|
func hexFile(file string) []byte {
|
|
fileContent, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Gather hex data, ignore comments.
|
|
var text []byte
|
|
for _, line := range bytes.Split(fileContent, []byte("\n")) {
|
|
line = bytes.TrimSpace(line)
|
|
if len(line) > 0 && line[0] == '#' {
|
|
continue
|
|
}
|
|
text = append(text, line...)
|
|
}
|
|
|
|
// Parse the hex.
|
|
if bytes.HasPrefix(text, []byte("0x")) {
|
|
text = text[2:]
|
|
}
|
|
data := make([]byte, hex.DecodedLen(len(text)))
|
|
if _, err := hex.Decode(data, text); err != nil {
|
|
panic("invalid hex in " + file)
|
|
}
|
|
return data
|
|
}
|
|
|
|
// writeTestVector writes a test vector file with the given commentary and binary data.
|
|
func writeTestVector(file, comment string, data []byte) {
|
|
fd, err := os.OpenFile(file, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer fd.Close()
|
|
|
|
if len(comment) > 0 {
|
|
for _, line := range strings.Split(strings.TrimSpace(comment), "\n") {
|
|
fmt.Fprintf(fd, "# %s\n", line)
|
|
}
|
|
fmt.Fprintln(fd)
|
|
}
|
|
for len(data) > 0 {
|
|
var chunk []byte
|
|
if len(data) < 32 {
|
|
chunk = data
|
|
} else {
|
|
chunk = data[:32]
|
|
}
|
|
data = data[len(chunk):]
|
|
fmt.Fprintf(fd, "%x\n", chunk)
|
|
}
|
|
}
|