package personal import ( "context" "fmt" "os" "time" "github.com/tharsis/ethermint/rpc/ethereum/backend" "github.com/cosmos/cosmos-sdk/client" "github.com/tharsis/ethermint/crypto/hd" ethermint "github.com/tharsis/ethermint/types" "github.com/tendermint/tendermint/libs/log" 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/tharsis/ethermint/crypto/ethsecp256k1" evmtypes "github.com/tharsis/ethermint/x/evm/types" ) // PrivateAccountAPI is the personal_ prefixed set of APIs in the Web3 JSON-RPC spec. type PrivateAccountAPI struct { clientCtx client.Context backend backend.Backend logger log.Logger hdPathIter ethermint.HDPathIterator } // NewAPI creates an instance of the public Personal Eth API. func NewAPI(logger log.Logger, clientCtx client.Context, backend backend.Backend) *PrivateAccountAPI { cfg := sdk.GetConfig() basePath := cfg.GetFullBIP44Path() iterator, err := ethermint.NewHDPathIterator(basePath, true) if err != nil { panic(err) } return &PrivateAccountAPI{ clientCtx: clientCtx, logger: logger.With("api", "personal"), hdPathIter: iterator, backend: backend, } } // 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_", where 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 := ðsecp256k1.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.clientCtx.Keyring.KeyByAddress(addr); err == nil { return ethereumAddr, nil } // ignore error as we only care about the length of the list list, _ := api.clientCtx.Keyring.List() privKeyName := fmt.Sprintf("personal_%d", len(list)) armor := sdkcrypto.EncryptArmorPrivKey(privKey, password, ethsecp256k1.KeyType) if err := api.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.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.Debug("personal_lockAccount", "address", address.String()) api.logger.Info("personal_lockAccount not supported") // TODO: Not supported. See underlying issue https://github.com/99designs/keyring/issues/85 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 hdPath := api.hdPathIter() info, _, err := api.clientCtx.Keyring.NewMnemonic(name, keyring.English, hdPath.String(), password, hd.EthSecp256k1) if err != nil { return common.Address{}, err } addr := common.BytesToAddress(info.GetPubKey().Address().Bytes()) api.logger.Info("Your new key was generated", "address", addr.String()) api.logger.Info("Please backup your key file!", "path", os.Getenv("HOME")+"/.ethermint/"+name) // TODO: pass the correct binary api.logger.Info("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. func (api *PrivateAccountAPI) UnlockAccount(_ context.Context, addr common.Address, _ string, _ *uint64) (bool, error) { api.logger.Debug("personal_unlockAccount", "address", addr.String()) // TODO: Not supported. See underlying issue https://github.com/99designs/keyring/issues/85 return false, nil } // 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 evmtypes.TransactionArgs, _ string) (common.Hash, error) { api.logger.Debug("personal_sendTransaction", "address", args.To.String()) if args.From == nil { return common.Hash{}, fmt.Errorf("from address cannot be nil in send transaction") } addr := sdk.AccAddress(args.From.Bytes()) // check if the key is on the keyring _, err := api.clientCtx.Keyring.KeyByAddress(addr) if err != nil { return common.Hash{}, err } return api.backend.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, _ string) (hexutil.Bytes, error) { api.logger.Debug("personal_sign", "data", data, "address", addr.String()) cosmosAddr := sdk.AccAddress(addr.Bytes()) sig, _, err := api.clientCtx.Keyring.SignByAddress(cosmosAddr, accounts.TextHash(data)) if err != nil { api.logger.Error("failed to sign with key", "data", data, "address", addr.String(), "error", err.Error()) 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 } // Unpair deletes a pairing between wallet and ethermint. func (api *PrivateAccountAPI) Unpair(_ context.Context, url, pin string) error { api.logger.Debug("personal_unpair", "url", url, "pin", pin) api.logger.Info("personal_unpair for smartcard wallet not supported") // TODO: Smartcard wallet not supported yet, refer to: https://github.com/ethereum/go-ethereum/blob/master/accounts/scwallet/README.md return fmt.Errorf("smartcard wallet not supported yet") }