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- // Copyright 2018 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 (
- "fmt"
- "io/ioutil"
- "strings"
- "github.com/ethereum/go-ethereum/accounts/keystore"
- "github.com/ethereum/go-ethereum/cmd/utils"
- "gopkg.in/urfave/cli.v1"
- )
- var newPassphraseFlag = cli.StringFlag{
- Name: "newpasswordfile",
- Usage: "the file that contains the new password for the keyfile",
- }
- var commandChangePassphrase = cli.Command{
- Name: "changepassword",
- Usage: "change the password on a keyfile",
- ArgsUsage: "<keyfile>",
- Description: `
- Change the password of a keyfile.`,
- Flags: []cli.Flag{
- passphraseFlag,
- newPassphraseFlag,
- },
- Action: func(ctx *cli.Context) error {
- keyfilepath := ctx.Args().First()
- // Read key from file.
- keyjson, err := ioutil.ReadFile(keyfilepath)
- if err != nil {
- utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
- }
- // Decrypt key with passphrase.
- passphrase := getPassphrase(ctx, false)
- key, err := keystore.DecryptKey(keyjson, passphrase)
- if err != nil {
- utils.Fatalf("Error decrypting key: %v", err)
- }
- // Get a new passphrase.
- fmt.Println("Please provide a new password")
- var newPhrase string
- if passFile := ctx.String(newPassphraseFlag.Name); passFile != "" {
- content, err := ioutil.ReadFile(passFile)
- if err != nil {
- utils.Fatalf("Failed to read new password file '%s': %v", passFile, err)
- }
- newPhrase = strings.TrimRight(string(content), "\r\n")
- } else {
- newPhrase = utils.GetPassPhrase("", true)
- }
- // Encrypt the key with the new passphrase.
- newJson, err := keystore.EncryptKey(key, newPhrase, keystore.StandardScryptN, keystore.StandardScryptP)
- if err != nil {
- utils.Fatalf("Error encrypting with new password: %v", err)
- }
- // Then write the new keyfile in place of the old one.
- if err := ioutil.WriteFile(keyfilepath, newJson, 0600); err != nil {
- utils.Fatalf("Error writing new keyfile to disk: %v", err)
- }
- // Don't print anything. Just return successfully,
- // producing a positive exit code.
- return nil
- },
- }
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