lnd.xprv/input/test_utils.go

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package input
import (
"bytes"
"encoding/hex"
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
)
var (
// For simplicity a single priv key controls all of our test outputs.
testWalletPrivKey = []byte{
0x2b, 0xd8, 0x06, 0xc9, 0x7f, 0x0e, 0x00, 0xaf,
0x1a, 0x1f, 0xc3, 0x32, 0x8f, 0xa7, 0x63, 0xa9,
0x26, 0x97, 0x23, 0xc8, 0xdb, 0x8f, 0xac, 0x4f,
0x93, 0xaf, 0x71, 0xdb, 0x18, 0x6d, 0x6e, 0x90,
}
// We're alice :)
bobsPrivKey = []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,
}
// Use a hard-coded HD seed.
testHdSeed = chainhash.Hash{
0xb7, 0x94, 0x38, 0x5f, 0x2d, 0x1e, 0xf7, 0xab,
0x4d, 0x92, 0x73, 0xd1, 0x90, 0x63, 0x81, 0xb4,
0x4f, 0x2f, 0x6f, 0x25, 0x88, 0xa3, 0xef, 0xb9,
0x6a, 0x49, 0x18, 0x83, 0x31, 0x98, 0x47, 0x53,
}
)
// MockSigner is a simple implementation of the Signer interface. Each one has
// a set of private keys in a slice and can sign messages using the appropriate
// one.
type MockSigner struct {
Privkeys []*btcec.PrivateKey
NetParams *chaincfg.Params
}
// SignOutputRaw generates a signature for the passed transaction according to
// the data within the passed SignDescriptor.
func (m *MockSigner) SignOutputRaw(tx *wire.MsgTx,
signDesc *SignDescriptor) (Signature, error) {
pubkey := signDesc.KeyDesc.PubKey
switch {
case signDesc.SingleTweak != nil:
pubkey = TweakPubKeyWithTweak(pubkey, signDesc.SingleTweak)
case signDesc.DoubleTweak != nil:
pubkey = DeriveRevocationPubkey(pubkey, signDesc.DoubleTweak.PubKey())
}
hash160 := btcutil.Hash160(pubkey.SerializeCompressed())
privKey := m.findKey(hash160, signDesc.SingleTweak, signDesc.DoubleTweak)
if privKey == nil {
return nil, fmt.Errorf("mock signer does not have key")
}
sig, err := txscript.RawTxInWitnessSignature(tx, signDesc.SigHashes,
signDesc.InputIndex, signDesc.Output.Value, signDesc.WitnessScript,
signDesc.HashType, privKey)
if err != nil {
return nil, err
}
return btcec.ParseDERSignature(sig[:len(sig)-1], btcec.S256())
}
// ComputeInputScript generates a complete InputIndex for the passed transaction
// with the signature as defined within the passed SignDescriptor. This method
// should be capable of generating the proper input script for both regular
// p2wkh output and p2wkh outputs nested within a regular p2sh output.
func (m *MockSigner) ComputeInputScript(tx *wire.MsgTx, signDesc *SignDescriptor) (*Script, error) {
scriptType, addresses, _, err := txscript.ExtractPkScriptAddrs(
signDesc.Output.PkScript, m.NetParams)
if err != nil {
return nil, err
}
switch scriptType {
case txscript.PubKeyHashTy:
privKey := m.findKey(addresses[0].ScriptAddress(), signDesc.SingleTweak,
signDesc.DoubleTweak)
if privKey == nil {
return nil, fmt.Errorf("mock signer does not have key for "+
"address %v", addresses[0])
}
sigScript, err := txscript.SignatureScript(
tx, signDesc.InputIndex, signDesc.Output.PkScript,
txscript.SigHashAll, privKey, true,
)
if err != nil {
return nil, err
}
return &Script{SigScript: sigScript}, nil
case txscript.WitnessV0PubKeyHashTy:
privKey := m.findKey(addresses[0].ScriptAddress(), signDesc.SingleTweak,
signDesc.DoubleTweak)
if privKey == nil {
return nil, fmt.Errorf("mock signer does not have key for "+
"address %v", addresses[0])
}
witnessScript, err := txscript.WitnessSignature(tx, signDesc.SigHashes,
signDesc.InputIndex, signDesc.Output.Value,
signDesc.Output.PkScript, txscript.SigHashAll, privKey, true)
if err != nil {
return nil, err
}
return &Script{Witness: witnessScript}, nil
default:
return nil, fmt.Errorf("unexpected script type: %v", scriptType)
}
}
// findKey searches through all stored private keys and returns one
// corresponding to the hashed pubkey if it can be found. The public key may
// either correspond directly to the private key or to the private key with a
// tweak applied.
func (m *MockSigner) findKey(needleHash160 []byte, singleTweak []byte,
doubleTweak *btcec.PrivateKey) *btcec.PrivateKey {
for _, privkey := range m.Privkeys {
// First check whether public key is directly derived from private key.
hash160 := btcutil.Hash160(privkey.PubKey().SerializeCompressed())
if bytes.Equal(hash160, needleHash160) {
return privkey
}
// Otherwise check if public key is derived from tweaked private key.
switch {
case singleTweak != nil:
privkey = TweakPrivKey(privkey, singleTweak)
case doubleTweak != nil:
privkey = DeriveRevocationPrivKey(privkey, doubleTweak)
default:
continue
}
hash160 = btcutil.Hash160(privkey.PubKey().SerializeCompressed())
if bytes.Equal(hash160, needleHash160) {
return privkey
}
}
return nil
}
// pubkeyFromHex parses a Bitcoin public key from a hex encoded string.
func pubkeyFromHex(keyHex string) (*btcec.PublicKey, error) {
bytes, err := hex.DecodeString(keyHex)
if err != nil {
return nil, err
}
return btcec.ParsePubKey(bytes, btcec.S256())
}
// privkeyFromHex parses a Bitcoin private key from a hex encoded string.
func privkeyFromHex(keyHex string) (*btcec.PrivateKey, error) {
bytes, err := hex.DecodeString(keyHex)
if err != nil {
return nil, err
}
key, _ := btcec.PrivKeyFromBytes(btcec.S256(), bytes)
return key, nil
}
// pubkeyToHex serializes a Bitcoin public key to a hex encoded string.
func pubkeyToHex(key *btcec.PublicKey) string {
return hex.EncodeToString(key.SerializeCompressed())
}
// privkeyFromHex serializes a Bitcoin private key to a hex encoded string.
func privkeyToHex(key *btcec.PrivateKey) string {
return hex.EncodeToString(key.Serialize())
}