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- // Copyright 2017 The go-ethereum Authors
- // This file is part of go-ethereum.
- //
- // go-ethereum is free software: you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // go-ethereum is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
- package main
- import (
- "encoding/json"
- "fmt"
- "io/ioutil"
- "strings"
- "github.com/ethereum/go-ethereum/cmd/utils"
- "github.com/ethereum/go-ethereum/crypto"
- "gopkg.in/urfave/cli.v1"
- )
- // getPassphrase obtains a passphrase given by the user. It first checks the
- // --passfile command line flag and ultimately prompts the user for a
- // passphrase.
- func getPassphrase(ctx *cli.Context, confirmation bool) string {
- // Look for the --passwordfile flag.
- passphraseFile := ctx.String(passphraseFlag.Name)
- if passphraseFile != "" {
- content, err := ioutil.ReadFile(passphraseFile)
- if err != nil {
- utils.Fatalf("Failed to read password file '%s': %v",
- passphraseFile, err)
- }
- return strings.TrimRight(string(content), "\r\n")
- }
- // Otherwise prompt the user for the passphrase.
- return utils.GetPassPhrase("", confirmation)
- }
- // signHash is a helper function that calculates a hash for the given message
- // that can be safely used to calculate a signature from.
- //
- // The hash is calulcated as
- // keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
- //
- // This gives context to the signed message and prevents signing of transactions.
- func signHash(data []byte) []byte {
- msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
- return crypto.Keccak256([]byte(msg))
- }
- // mustPrintJSON prints the JSON encoding of the given object and
- // exits the program with an error message when the marshaling fails.
- func mustPrintJSON(jsonObject interface{}) {
- str, err := json.MarshalIndent(jsonObject, "", " ")
- if err != nil {
- utils.Fatalf("Failed to marshal JSON object: %v", err)
- }
- fmt.Println(string(str))
- }
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