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如何解密keystore文件

 5 years ago
source link: https://huoding.com/2018/09/26/697?amp%3Butm_medium=referral
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如果你用 geth 创建过账号「geth –datadir /path/to/data account new」，那么多半知道 keystore 文件，它通过一个 password 加密保存着账号的私钥：

rmqe6bR.png!web

keystore

如果我想拿到加密前的私钥怎么办？最容易想到的办法是在 MetaMask 中导入账号的时候选择通过 JSON 文件导入的方式，然后再导出私钥。不过这个方法不方便，也无法实现自动化，下面看看如何通过 golang 解密 keystore 文件：

package main

import (
    "encoding/hex"
    "flag"
    "fmt"
    "io/ioutil"
    "os"

    "github.com/ethereum/go-ethereum/accounts/keystore"
    "github.com/ethereum/go-ethereum/crypto"
)

var (
    file     = flag.String("file", "", "file")
    password = flag.String("password", "", "password")
)

func init() {
    flag.Parse()
}

func main() {
    if _, err := os.Stat(*file); os.IsNotExist(err) {
        flag.Usage()
        os.Exit(1)
    }

    keyjson, err := ioutil.ReadFile(*file)
    if err != nil {
        panic(err)
    }

    key, err := keystore.DecryptKey(keyjson, *password)
    if err != nil {
        panic(err)
    }

    address := key.Address.Hex()
    privateKey := hex.EncodeToString(crypto.FromECDSA(key.PrivateKey))

    fmt.Printf("Address:\t%s\nPrivateKey:\t%s\n",
        address,
        privateKey,
    )
}

代码极其简单，就不用多做解释了，收工！


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