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Update L1 coordinator Txs

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This commit is contained in:
laisolizq
2020-11-24 12:11:35 +01:00
parent 486c70e935
commit 7ceaf4c32b
2 changed files with 10 additions and 9 deletions
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16
common/l1tx.go
View File

@@ -285,14 +285,18 @@ func L1UserTxFromBytes(b []byte) (*L1Tx, error) {
return tx, nil
}
func signHash(data []byte) []byte {
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
return crypto.Keccak256([]byte(msg))
}
// L1CoordinatorTxFromBytes decodes a L1Tx from []byte
func L1CoordinatorTxFromBytes(b []byte, chainID *big.Int, hermezAddress ethCommon.Address) (*L1Tx, error) {
if len(b) != L1CoordinatorTxBytesLen {
return nil, fmt.Errorf("Can not parse L1CoordinatorTx bytes, expected length %d, current: %d", 101, len(b))
}
bytesMessage1 := []byte("\x19Ethereum Signed Message:\n120")
bytesMessage2 := []byte("I authorize this babyjubjub key for hermez rollup account creation")
bytesMessage := []byte("I authorize this babyjubjub key for hermez rollup account creation")
tx := &L1Tx{
UserOrigin: false,
@@ -320,18 +324,16 @@ func L1CoordinatorTxFromBytes(b []byte, chainID *big.Int, hermezAddress ethCommo
// Ethereum adds 27 to v
v = b[0] - byte(27) //nolint:gomnd
chainIDBytes := ethCommon.LeftPadBytes(chainID.Bytes(), 2)
hermezAddressBytes := ethCommon.LeftPadBytes(hermezAddress.Bytes(), 32)
var data []byte
data = append(data, bytesMessage1...)
data = append(data, bytesMessage2...)
data = append(data, bytesMessage...)
data = append(data, pkCompB...)
data = append(data, chainIDBytes[:]...)
data = append(data, hermezAddressBytes...)
data = append(data, hermezAddress.Bytes()...)
var signature []byte
signature = append(signature, r[:]...)
signature = append(signature, s[:]...)
signature = append(signature, v)
hash := crypto.Keccak256(data)
hash := signHash(data)
pubKeyBytes, err := crypto.Ecrecover(hash, signature)
if err != nil {
return nil, err

3
common/l1tx_test.go
View File

@@ -138,7 +138,6 @@ func TestL1TxByteParsersCompatibility(t *testing.T) {
func TestL1CoordinatorTxByteParsers(t *testing.T) {
hermezAddress := ethCommon.HexToAddress("0xD6C850aeBFDC46D7F4c207e445cC0d6B0919BDBe")
hermezAddressBytes := ethCommon.LeftPadBytes(hermezAddress.Bytes(), 32)
chainID := big.NewInt(1337)
chainIDBytes := ethCommon.LeftPadBytes(chainID.Bytes(), 2)
@@ -170,7 +169,7 @@ func TestL1CoordinatorTxByteParsers(t *testing.T) {
data = append(data, bytesMessage2...)
data = append(data, babyjubB[:]...)
data = append(data, chainIDBytes...)
data = append(data, hermezAddressBytes...)
data = append(data, hermezAddress.Bytes()...)
hash := crypto.Keccak256Hash(data)
signature, err := crypto.Sign(hash.Bytes(), privateKey)
require.Nil(t, err)