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