75fb3ccb89
* Fix wrong blockHash value in evm * fix ut * store current block hash in BeginBlock * update ut * update comment * add changelog
161 lines
4.4 KiB
Go
161 lines
4.4 KiB
Go
package types
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import (
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"fmt"
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"math/big"
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"strings"
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"github.com/pkg/errors"
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"golang.org/x/crypto/sha3"
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"github.com/cosmos/cosmos-sdk/codec"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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ethcmn "github.com/ethereum/go-ethereum/common"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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ethcrypto "github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/cosmos/ethermint/crypto/ethsecp256k1"
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)
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// GenerateEthAddress generates an Ethereum address.
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func GenerateEthAddress() ethcmn.Address {
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priv, err := ethsecp256k1.GenerateKey()
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if err != nil {
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panic(err)
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}
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return ethcrypto.PubkeyToAddress(priv.ToECDSA().PublicKey)
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}
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// ValidateSigner attempts to validate a signer for a given slice of bytes over
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// which a signature and signer is given. An error is returned if address
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// derived from the signature and bytes signed does not match the given signer.
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func ValidateSigner(signBytes, sig []byte, signer ethcmn.Address) error {
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pk, err := ethcrypto.SigToPub(signBytes, sig)
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if err != nil {
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return errors.Wrap(err, "failed to derive public key from signature")
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} else if ethcrypto.PubkeyToAddress(*pk) != signer {
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return fmt.Errorf("invalid signature for signer: %s", signer)
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}
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return nil
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}
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func rlpHash(x interface{}) (hash ethcmn.Hash) {
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hasher := sha3.NewLegacyKeccak256()
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_ = rlp.Encode(hasher, x)
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_ = hasher.Sum(hash[:0])
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return hash
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}
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// ResultData represents the data returned in an sdk.Result
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type ResultData struct {
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ContractAddress ethcmn.Address `json:"contract_address"`
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Bloom ethtypes.Bloom `json:"bloom"`
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Logs []*ethtypes.Log `json:"logs"`
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Ret []byte `json:"ret"`
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TxHash ethcmn.Hash `json:"tx_hash"`
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}
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// String implements fmt.Stringer interface.
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func (rd ResultData) String() string {
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var logsStr string
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logsLen := len(rd.Logs)
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for i := 0; i < logsLen; i++ {
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logsStr = fmt.Sprintf("%s\t\t%v\n ", logsStr, *rd.Logs[i])
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}
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return strings.TrimSpace(fmt.Sprintf(`ResultData:
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ContractAddress: %s
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Bloom: %s
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Ret: %v
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TxHash: %s
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Logs:
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%s`, rd.ContractAddress.String(), rd.Bloom.Big().String(), rd.Ret, rd.TxHash.String(), logsStr))
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}
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// EncodeResultData takes all of the necessary data from the EVM execution
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// and returns the data as a byte slice encoded with amino
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func EncodeResultData(data ResultData) ([]byte, error) {
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return ModuleCdc.MarshalBinaryLengthPrefixed(data)
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}
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// DecodeResultData decodes an amino-encoded byte slice into ResultData
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func DecodeResultData(in []byte) (ResultData, error) {
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var data ResultData
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err := ModuleCdc.UnmarshalBinaryLengthPrefixed(in, &data)
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if err != nil {
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return ResultData{}, err
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}
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return data, nil
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}
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// ----------------------------------------------------------------------------
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// Auxiliary
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// TxDecoder returns an sdk.TxDecoder that can decode both auth.StdTx and
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// MsgEthereumTx transactions.
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func TxDecoder(cdc *codec.Codec) sdk.TxDecoder {
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return func(txBytes []byte) (sdk.Tx, error) {
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var tx sdk.Tx
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if len(txBytes) == 0 {
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return nil, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "tx bytes are empty")
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}
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// sdk.Tx is an interface. The concrete message types
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// are registered by MakeTxCodec
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// TODO: switch to UnmarshalBinaryBare on SDK v0.40.0
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err := cdc.UnmarshalBinaryLengthPrefixed(txBytes, &tx)
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if err != nil {
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return nil, sdkerrors.Wrap(sdkerrors.ErrTxDecode, err.Error())
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}
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return tx, nil
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}
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}
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// recoverEthSig recovers a signature according to the Ethereum specification and
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// returns the sender or an error.
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//
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// Ref: Ethereum Yellow Paper (BYZANTIUM VERSION 69351d5) Appendix F
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// nolint: gocritic
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func recoverEthSig(R, S, Vb *big.Int, sigHash ethcmn.Hash) (ethcmn.Address, error) {
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if Vb.BitLen() > 8 {
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return ethcmn.Address{}, errors.New("invalid signature")
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}
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V := byte(Vb.Uint64() - 27)
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if !ethcrypto.ValidateSignatureValues(V, R, S, true) {
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return ethcmn.Address{}, errors.New("invalid signature")
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}
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// encode the signature in uncompressed format
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r, s := R.Bytes(), S.Bytes()
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sig := make([]byte, 65)
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copy(sig[32-len(r):32], r)
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copy(sig[64-len(s):64], s)
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sig[64] = V
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// recover the public key from the signature
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pub, err := ethcrypto.Ecrecover(sigHash[:], sig)
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if err != nil {
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return ethcmn.Address{}, err
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}
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if len(pub) == 0 || pub[0] != 4 {
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return ethcmn.Address{}, errors.New("invalid public key")
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}
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var addr ethcmn.Address
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copy(addr[:], ethcrypto.Keccak256(pub[1:])[12:])
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return addr, nil
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}
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