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Update L1CoordinatorTxFromBytes to EIP712

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This commit is contained in:
arnaucube
2021-02-28 10:56:51 +01:00
parent f664a3a382
commit 56ffea2190
2 changed files with 19 additions and 27 deletions
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25
common/l1tx.go
View File

@@ -368,19 +368,12 @@ 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 ethCrypto.Keccak256([]byte(msg))
}
// L1CoordinatorTxFromBytes decodes a L1Tx from []byte
func L1CoordinatorTxFromBytes(b []byte, chainID *big.Int, hermezAddress ethCommon.Address) (*L1Tx, error) {
if len(b) != RollupConstL1CoordinatorTotalBytes {
return nil, tracerr.Wrap(fmt.Errorf("Can not parse L1CoordinatorTx bytes, expected length %d, current: %d", 101, len(b)))
}
bytesMessage := []byte("I authorize this babyjubjub key for hermez rollup account creation")
tx := &L1Tx{
UserOrigin: false,
}
@@ -401,18 +394,20 @@ func L1CoordinatorTxFromBytes(b []byte, chainID *big.Int, hermezAddress ethCommo
// L1CoordinatorTX ETH
// Ethereum adds 27 to v
v = b[0] - byte(27) //nolint:gomnd
chainIDBytes := ethCommon.LeftPadBytes(chainID.Bytes(), 2)
var data []byte
data = append(data, bytesMessage...)
data = append(data, pkCompB...)
data = append(data, chainIDBytes[:]...)
data = append(data, hermezAddress.Bytes()...)
var signature []byte
signature = append(signature, r[:]...)
signature = append(signature, s[:]...)
signature = append(signature, v)
hash := signHash(data)
pubKeyBytes, err := ethCrypto.Ecrecover(hash, signature)
accCreationAuth := AccountCreationAuth{
BJJ: tx.FromBJJ,
}
h, err := accCreationAuth.HashToSign(uint16(chainID.Uint64()), hermezAddress)
if err != nil {
return nil, tracerr.Wrap(err)
}
pubKeyBytes, err := ethCrypto.Ecrecover(h, signature)
if err != nil {
return nil, tracerr.Wrap(err)
}

21
common/l1tx_test.go
View File

@@ -227,7 +227,6 @@ func TestL1TxByteParsersCompatibility(t *testing.T) {
func TestL1CoordinatorTxByteParsers(t *testing.T) {
hermezAddress := ethCommon.HexToAddress("0xD6C850aeBFDC46D7F4c207e445cC0d6B0919BDBe")
chainID := big.NewInt(1337)
chainIDBytes := ethCommon.LeftPadBytes(chainID.Bytes(), 2)
privateKey, err := crypto.HexToECDSA("fad9c8855b740a0b7ed4c221dbad0f33a83a49cad6b3fe8d5817ac83d38b6a19")
require.NoError(t, err)
@@ -245,18 +244,16 @@ func TestL1CoordinatorTxByteParsers(t *testing.T) {
pkCompL := []byte("56ca90f80d7c374ae7485e9bcc47d4ac399460948da6aeeb899311097925a72c")
err = pkComp.UnmarshalText(pkCompL)
require.NoError(t, err)
bytesMessage1 := []byte("\x19Ethereum Signed Message:\n120")
bytesMessage2 := []byte("I authorize this babyjubjub key for hermez rollup account creation")
babyjubB := SwapEndianness(pkComp[:])
var data []byte
data = append(data, bytesMessage1...)
data = append(data, bytesMessage2...)
data = append(data, babyjubB[:]...)
data = append(data, chainIDBytes...)
data = append(data, hermezAddress.Bytes()...)
hash := crypto.Keccak256Hash(data)
signature, err := crypto.Sign(hash.Bytes(), privateKey)
accCreationAuth := AccountCreationAuth{
EthAddr: fromEthAddr,
BJJ: pkComp,
}
h, err := accCreationAuth.HashToSign(uint16(chainID.Uint64()), hermezAddress)
require.NoError(t, err)
signature, err := crypto.Sign(h, privateKey)
require.NoError(t, err)
// Ethereum adds 27 to v
v := int(signature[64])