laconicd/ethereum/rpc/personal.go

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package rpc
import (
"context"
"fmt"
"os"
"time"
"github.com/cosmos/ethermint/crypto/hd"
ethermint "github.com/cosmos/ethermint/types"
log "github.com/xlab/suplog"
sdkcrypto "github.com/cosmos/cosmos-sdk/crypto"
"github.com/cosmos/cosmos-sdk/crypto/keyring"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/cosmos/ethermint/crypto/ethsecp256k1"
rpctypes "github.com/cosmos/ethermint/ethereum/rpc/types"
)
// PrivateAccountAPI is the personal_ prefixed set of APIs in the Web3 JSON-RPC spec.
type PrivateAccountAPI struct {
ethAPI *PublicEthAPI
logger log.Logger
}
// NewPersonalAPI creates an instance of the public Personal Eth API.
func NewPersonalAPI(ethAPI *PublicEthAPI) *PrivateAccountAPI {
return &PrivateAccountAPI{
ethAPI: ethAPI,
logger: log.WithField("module", "personal"),
}
}
// ImportRawKey armors and encrypts a given raw hex encoded ECDSA key and stores it into the key directory.
// The name of the key will have the format "personal_<length-keys>", where <length-keys> is the total number of
// keys stored on the keyring.
//
// NOTE: The key will be both armored and encrypted using the same passphrase.
func (api *PrivateAccountAPI) ImportRawKey(privkey, password string) (common.Address, error) {
api.logger.Debug("personal_importRawKey")
priv, err := crypto.HexToECDSA(privkey)
if err != nil {
return common.Address{}, err
}
privKey := &ethsecp256k1.PrivKey{Key: crypto.FromECDSA(priv)}
addr := sdk.AccAddress(privKey.PubKey().Address().Bytes())
ethereumAddr := common.BytesToAddress(addr)
// return if the key has already been imported
if _, err := api.ethAPI.ClientCtx().Keyring.KeyByAddress(addr); err == nil {
return ethereumAddr, nil
}
// ignore error as we only care about the length of the list
list, _ := api.ethAPI.ClientCtx().Keyring.List()
privKeyName := fmt.Sprintf("personal_%d", len(list))
armor := sdkcrypto.EncryptArmorPrivKey(privKey, password, ethsecp256k1.KeyType)
if err := api.ethAPI.ClientCtx().Keyring.ImportPrivKey(privKeyName, armor, password); err != nil {
return common.Address{}, err
}
api.logger.Info("key successfully imported", "name", privKeyName, "address", ethereumAddr.String())
return ethereumAddr, nil
}
// ListAccounts will return a list of addresses for accounts this node manages.
func (api *PrivateAccountAPI) ListAccounts() ([]common.Address, error) {
api.logger.Debug("personal_listAccounts")
addrs := []common.Address{}
list, err := api.ethAPI.ClientCtx().Keyring.List()
if err != nil {
return nil, err
}
for _, info := range list {
addrs = append(addrs, common.BytesToAddress(info.GetPubKey().Address()))
}
return addrs, nil
}
// LockAccount will lock the account associated with the given address when it's unlocked.
// It removes the key corresponding to the given address from the API's local keys.
func (api *PrivateAccountAPI) LockAccount(address common.Address) bool {
api.logger.Debugln("personal_lockAccount", "address", address.String())
api.logger.Info("personal_lockAccount not supported")
return false
}
// NewAccount will create a new account and returns the address for the new account.
func (api *PrivateAccountAPI) NewAccount(password string) (common.Address, error) {
api.logger.Debug("personal_newAccount")
name := "key_" + time.Now().UTC().Format(time.RFC3339)
// create the mnemonic and save the account
info, _, err := api.ethAPI.ClientCtx().Keyring.NewMnemonic(name, keyring.English, ethermint.BIP44HDPath, hd.EthSecp256k1)
if err != nil {
return common.Address{}, err
}
addr := common.BytesToAddress(info.GetPubKey().Address().Bytes())
api.logger.Infoln("Your new key was generated", "address", addr.String())
api.logger.Infoln("Please backup your key file!", "path", os.Getenv("HOME")+"/.ethermint/"+name)
api.logger.Infoln("Please remember your password!")
return addr, nil
}
// UnlockAccount will unlock the account associated with the given address with
// the given password for duration seconds. If duration is nil it will use a
// default of 300 seconds. It returns an indication if the account was unlocked.
// It exports the private key corresponding to the given address from the keyring and stores it in the API's local keys.
func (api *PrivateAccountAPI) UnlockAccount(_ context.Context, addr common.Address, password string, _ *uint64) (bool, error) { // nolint: interfacer
api.logger.Debugln("personal_unlockAccount", "address", addr.String())
api.logger.Info("personal_unlockAccount not supported")
return false, fmt.Errorf("not supported")
}
// SendTransaction will create a transaction from the given arguments and
// tries to sign it with the key associated with args.To. If the given password isn't
// able to decrypt the key it fails.
func (api *PrivateAccountAPI) SendTransaction(_ context.Context, args rpctypes.SendTxArgs, pwrd string) (common.Hash, error) {
return api.ethAPI.SendTransaction(args)
}
// Sign calculates an Ethereum ECDSA signature for:
// keccak256("\x19Ethereum Signed Message:\n" + len(message) + message))
//
// Note, the produced signature conforms to the secp256k1 curve R, S and V values,
// where the V value will be 27 or 28 for legacy reasons.
//
// The key used to calculate the signature is decrypted with the given password.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
func (api *PrivateAccountAPI) Sign(_ context.Context, data hexutil.Bytes, addr common.Address, pwrd string) (hexutil.Bytes, error) {
api.logger.Debug("personal_sign", "data", data, "address", addr.String())
cosmosAddr := sdk.AccAddress(addr.Bytes())
sig, _, err := api.ethAPI.ClientCtx().Keyring.SignByAddress(cosmosAddr, accounts.TextHash(data))
if err != nil {
api.logger.WithError(err).Debugln("failed to sign with key", "data", data, "address", addr.String())
return nil, err
}
sig[crypto.RecoveryIDOffset] += 27 // transform V from 0/1 to 27/28
return sig, nil
}
// EcRecover returns the address for the account that was used to create the signature.
// Note, this function is compatible with eth_sign and personal_sign. As such it recovers
// the address of:
// hash = keccak256("\x19Ethereum Signed Message:\n"${message length}${message})
// addr = ecrecover(hash, signature)
//
// Note, the signature must conform to the secp256k1 curve R, S and V values, where
// the V value must be 27 or 28 for legacy reasons.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecove
func (api *PrivateAccountAPI) EcRecover(_ context.Context, data, sig hexutil.Bytes) (common.Address, error) {
api.logger.Debug("personal_ecRecover", "data", data, "sig", sig)
if len(sig) != crypto.SignatureLength {
return common.Address{}, fmt.Errorf("signature must be %d bytes long", crypto.SignatureLength)
}
if sig[crypto.RecoveryIDOffset] != 27 && sig[crypto.RecoveryIDOffset] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1
pubkey, err := crypto.SigToPub(accounts.TextHash(data), sig)
if err != nil {
return common.Address{}, err
}
return crypto.PubkeyToAddress(*pubkey), nil
}