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changepassphrase.go
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changepassphrase.go
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//<developer>
// <name>linapex 曹一峰</name>
// <email>linapex@163.com</email>
// <wx>superexc</wx>
// <qqgroup>128148617</qqgroup>
// <url>https://jsq.ink</url>
// <role>pku engineer</role>
// <date>2019-03-16 19:16:32</date>
//</624450067331289088>
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 passphrase for the keyfile",
}
var commandChangePassphrase = cli.Command{
Name: "changepassphrase",
Usage: "change the passphrase on a keyfile",
ArgsUsage: "<keyfile>",
Description: `
Change the passphrase of a keyfile.`,
Flags: []cli.Flag{
passphraseFlag,
newPassphraseFlag,
},
Action: func(ctx *cli.Context) error {
keyfilepath := ctx.Args().First()
//从文件中读取密钥。
keyjson, err := ioutil.ReadFile(keyfilepath)
if err != nil {
utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
}
//用密码短语解密密钥。
passphrase := getPassphrase(ctx)
key, err := keystore.DecryptKey(keyjson, passphrase)
if err != nil {
utils.Fatalf("Error decrypting key: %v", err)
}
//获取新密码。
fmt.Println("Please provide a new passphrase")
var newPhrase string
if passFile := ctx.String(newPassphraseFlag.Name); passFile != "" {
content, err := ioutil.ReadFile(passFile)
if err != nil {
utils.Fatalf("Failed to read new passphrase file '%s': %v", passFile, err)
}
newPhrase = strings.TrimRight(string(content), "\r\n")
} else {
newPhrase = promptPassphrase(true)
}
//用新密码短语加密密钥。
newJson, err := keystore.EncryptKey(key, newPhrase, keystore.StandardScryptN, keystore.StandardScryptP)
if err != nil {
utils.Fatalf("Error encrypting with new passphrase: %v", err)
}
//然后写新的关键文件代替旧的关键文件。
if err := ioutil.WriteFile(keyfilepath, newJson, 600); err != nil {
utils.Fatalf("Error writing new keyfile to disk: %v", err)
}
//不要打印任何内容。成功返回,
//生成一个正的退出代码。
return nil
},
}