github.com/linapex/ethereum-dpos-chinese@v0.0.0-20190316121959-b78b3a4a1ece/cmd/ethkey/generate.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 12:09:27</date>
    10  //</624342589264367616>
    11  
    12  
    13  package main
    14  
    15  import (
    16  	"crypto/ecdsa"
    17  	"fmt"
    18  	"io/ioutil"
    19  	"os"
    20  	"path/filepath"
    21  
    22  	"github.com/ethereum/go-ethereum/accounts/keystore"
    23  	"github.com/ethereum/go-ethereum/cmd/utils"
    24  	"github.com/ethereum/go-ethereum/crypto"
    25  	"github.com/pborman/uuid"
    26  	"gopkg.in/urfave/cli.v1"
    27  )
    28  
    29  type outputGenerate struct {
    30  	Address      string
    31  	AddressEIP55 string
    32  }
    33  
    34  var commandGenerate = cli.Command{
    35  	Name:      "generate",
    36  	Usage:     "generate new keyfile",
    37  	ArgsUsage: "[ <keyfile> ]",
    38  	Description: `
    39  Generate a new keyfile.
    40  
    41  If you want to encrypt an existing private key, it can be specified by setting
    42  --privatekey with the location of the file containing the private key.
    43  `,
    44  	Flags: []cli.Flag{
    45  		passphraseFlag,
    46  		jsonFlag,
    47  		cli.StringFlag{
    48  			Name:  "privatekey",
    49  			Usage: "file containing a raw private key to encrypt",
    50  		},
    51  	},
    52  	Action: func(ctx *cli.Context) error {
    53  //检查是否指定了关键文件路径，并确保它不存在。
    54  		keyfilepath := ctx.Args().First()
    55  		if keyfilepath == "" {
    56  			keyfilepath = defaultKeyfileName
    57  		}
    58  		if _, err := os.Stat(keyfilepath); err == nil {
    59  			utils.Fatalf("Keyfile already exists at %s.", keyfilepath)
    60  		} else if !os.IsNotExist(err) {
    61  			utils.Fatalf("Error checking if keyfile exists: %v", err)
    62  		}
    63  
    64  		var privateKey *ecdsa.PrivateKey
    65  		var err error
    66  		if file := ctx.String("privatekey"); file != "" {
    67  //从文件加载私钥。
    68  			privateKey, err = crypto.LoadECDSA(file)
    69  			if err != nil {
    70  				utils.Fatalf("Can't load private key: %v", err)
    71  			}
    72  		} else {
    73  //如果未加载，则生成随机。
    74  			privateKey, err = crypto.GenerateKey()
    75  			if err != nil {
    76  				utils.Fatalf("Failed to generate random private key: %v", err)
    77  			}
    78  		}
    79  
    80  //使用随机UUID创建keyfile对象。
    81  		id := uuid.NewRandom()
    82  		key := &keystore.Key{
    83  			Id:         id,
    84  			Address:    crypto.PubkeyToAddress(privateKey.PublicKey),
    85  			PrivateKey: privateKey,
    86  		}
    87  
    88  //用密码短语加密密钥。
    89  		passphrase := promptPassphrase(true)
    90  		keyjson, err := keystore.EncryptKey(key, passphrase, keystore.StandardScryptN, keystore.StandardScryptP)
    91  		if err != nil {
    92  			utils.Fatalf("Error encrypting key: %v", err)
    93  		}
    94  
    95  //将文件存储到磁盘。
    96  		if err := os.MkdirAll(filepath.Dir(keyfilepath), 0700); err != nil {
    97  			utils.Fatalf("Could not create directory %s", filepath.Dir(keyfilepath))
    98  		}
    99  		if err := ioutil.WriteFile(keyfilepath, keyjson, 0600); err != nil {
   100  			utils.Fatalf("Failed to write keyfile to %s: %v", keyfilepath, err)
   101  		}
   102  
   103  //输出一些信息。
   104  		out := outputGenerate{
   105  			Address: key.Address.Hex(),
   106  		}
   107  		if ctx.Bool(jsonFlag.Name) {
   108  			mustPrintJSON(out)
   109  		} else {
   110  			fmt.Println("Address:", out.Address)
   111  		}
   112  		return nil
   113  	},
   114  }
   115