fuzz/brontide: add fuzzing helper utilities

This commit is contained in:
nsa 2020-01-30 13:35:27 -05:00
parent 7c316b9194
commit 511fdb2520
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GPG Key ID: 118759E83439A9B1

137
fuzz/brontide/fuzz_utils.go Normal file

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// +build gofuzz
package brontidefuzz
import (
"encoding/hex"
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/brontide"
)
var (
initBytes = []byte{
0x81, 0xb6, 0x37, 0xd8, 0xfc, 0xd2, 0xc6, 0xda,
0x63, 0x59, 0xe6, 0x96, 0x31, 0x13, 0xa1, 0x17,
0xd, 0xe7, 0x95, 0xe4, 0xb7, 0x25, 0xb8, 0x4d,
0x1e, 0xb, 0x4c, 0xfd, 0x9e, 0xc5, 0x8c, 0xe9,
}
respBytes = []byte{
0xaa, 0xb6, 0x37, 0xd9, 0xfc, 0xd2, 0xc6, 0xda,
0x63, 0x59, 0xe6, 0x99, 0x31, 0x13, 0xa1, 0x17,
0xd, 0xe7, 0x95, 0xe9, 0xb7, 0x25, 0xb8, 0x4d,
0x1e, 0xb, 0x4c, 0xf9, 0x9e, 0xc5, 0x8c, 0xe9,
}
// Returns the initiator's ephemeral private key.
initEphemeral = brontide.EphemeralGenerator(func() (*btcec.PrivateKey, error) {
e := "121212121212121212121212121212121212121212121212121212" +
"1212121212"
eBytes, err := hex.DecodeString(e)
if err != nil {
return nil, err
}
priv, _ := btcec.PrivKeyFromBytes(btcec.S256(), eBytes)
return priv, nil
})
// Returns the responder's ephemeral private key.
respEphemeral = brontide.EphemeralGenerator(func() (*btcec.PrivateKey, error) {
e := "222222222222222222222222222222222222222222222222222" +
"2222222222222"
eBytes, err := hex.DecodeString(e)
if err != nil {
return nil, err
}
priv, _ := btcec.PrivKeyFromBytes(btcec.S256(), eBytes)
return priv, nil
})
)
// completeHandshake takes two brontide machines (initiator, responder)
// and completes the brontide handshake between them. If any part of the
// handshake fails, this function will panic.
func completeHandshake(initiator, responder *brontide.Machine) {
if err := handshake(initiator, responder); err != nil {
nilAndPanic(initiator, responder, err)
}
}
// handshake actually completes the brontide handshake and bubbles up
// an error to the calling function.
func handshake(initiator, responder *brontide.Machine) error {
// Generate ActOne and send to the responder.
actOne, err := initiator.GenActOne()
if err != nil {
return err
}
if err := responder.RecvActOne(actOne); err != nil {
return err
}
// Generate ActTwo and send to initiator.
actTwo, err := responder.GenActTwo()
if err != nil {
return err
}
if err := initiator.RecvActTwo(actTwo); err != nil {
return err
}
// Generate ActThree and send to responder.
actThree, err := initiator.GenActThree()
if err != nil {
return err
}
return responder.RecvActThree(actThree)
}
// nilAndPanic first nils the initiator and responder's Curve fields and then
// panics.
func nilAndPanic(initiator, responder *brontide.Machine, err error) {
if initiator != nil {
initiator.SetCurveToNil()
}
if responder != nil {
responder.SetCurveToNil()
}
panic(fmt.Errorf("error: %v, initiator: %v, responder: %v", err,
spew.Sdump(initiator), spew.Sdump(responder)))
}
// getBrontideMachines returns two brontide machines that use random keys
// everywhere.
func getBrontideMachines() (*brontide.Machine, *brontide.Machine) {
initPriv, _ := btcec.NewPrivateKey(btcec.S256())
respPriv, _ := btcec.NewPrivateKey(btcec.S256())
respPub := (*btcec.PublicKey)(&respPriv.PublicKey)
initiator := brontide.NewBrontideMachine(true, initPriv, respPub)
responder := brontide.NewBrontideMachine(false, respPriv, nil)
return initiator, responder
}
// getStaticBrontideMachines returns two brontide machines that use static keys
// everywhere.
func getStaticBrontideMachines() (*brontide.Machine, *brontide.Machine) {
initPriv, _ := btcec.PrivKeyFromBytes(btcec.S256(), initBytes)
respPriv, respPub := btcec.PrivKeyFromBytes(btcec.S256(), respBytes)
initiator := brontide.NewBrontideMachine(
true, initPriv, respPub, initEphemeral,
)
responder := brontide.NewBrontideMachine(
false, respPriv, nil, respEphemeral,
)
return initiator, responder
}